Mullard ECC33=6SN7=B65 Frühe Produktion Ventil Rohr Doppel Triode Gute NOS?Das Datenblatt dieses Produkts wurde ursprünglich auf Englisch verfasst. Unten finden Sie eine automatische Übersetzung ins Deutsche. Sollten Sie irgendwelche Fragen haben, kontaktieren Sie uns.Mullard ECC33 = 6SN7 = B65 frühe Produktion Röhren-Doppeltriode Guter NOS?1x Mullard ECC33 = 6SN7 = B65, möglicherweise NOS, da es in Mullard-Folie verpackt geliefert wurde. Dieser Artikel wurde in Geräten getestet und funktioniert.Mullard ECC33 = 6SN7 = B65 frühe Produktion Röhren-Doppeltriode Guter NOS? 1x Mullard ECC33 = 6SN7 = B65, möglicherweise NOS, da es in Mullard-Folie verpackt geliefert wurde. Dieser Artikel wurde in Geräten getestet und funktioniert. Modified Item No MPN 561 Brand Mullard Non-Domestic Product No Custom Bundle No Country/Region of Manufacture United Kingdom Model ECC33 Type Triode

Mullard ECC33/6SN7 Black Platte Triode 1 =2150 Triode 2 =2250 100%=2530 Minimun good=1650 Attention please Read the following carefully before making purchases. I do not accept the return of the object for any reason. I repeat no reason. If your intention is to buy you must accept this condition. At the end of the auction do not make the payment. I will send you photos of how your valves will be packed. If you think the packaging is insufficient You can ask for the cancellation of the transaction that will be accepted by me.

Mullard ECC33/6SN7 Black Platte Triode 1 =2150 Triode 2 =2250 100%=2530 Minimun good=1650 Attention please Read the following carefully before making purchases. I do not accept the return of the object for any reason. I repeat no reason. If your intention is to buy you must accept this condition. At the end of the auction do not make the payment. I will send you photos of how your valves will be packed. If you think the packaging is insufficient You can ask for the cancellation of the transaction that will be accepted by me.

ECC33 Mullard B65 - 6SN7GT - CV181 - Pair - Test strong. Very early versions with ‘D’ getters, large flashing As always will be well packaged for secure delivery using Royal Mail Special Delivery (UK), £25 for international shipping. Tests well (see pictures) - no returns due to buyers swapping good valves for bad. Happy bidding!

Mullard ECC33/6SN7 Black Platte Triode 1 =2150 Triode 2 =2250 100%=2530 Minimun good=1650 Attention please Read the following carefully before making purchases. I do not accept the return of the object for any reason. I repeat no reason. If your intention is to buy you must accept this condition. At the end of the auction do not make the payment. I will send you photos of how your valves will be packed. If you think the packaging is insufficient You can ask for the cancellation of the transaction that will be accepted by me.

Mullard ECC33/6SN7 Black Platte Triode 1 =2150 Triode 2 =2250 100%=2530 Minimun good=1650 Attention please Read the following carefully before making purchases. I do not accept the return of the object for any reason. I repeat no reason. If your intention is to buy you must accept this condition. At the end of the auction do not make the payment. I will send you photos of how your valves will be packed. If you think the packaging is insufficient You can ask for the cancellation of the transaction that will be accepted by me.

Untitled Document 1950s Tung-Sol 6SN7GTB ECC33 Tall Bottle Tubes, Matched Pair, Tested You are bidding on a matched pair of 1950s Tung-Sol 6SN7GTB ECC33 tall bottle tubes. These tubes have triangular black plates and D getters at the top. They were made in the 1950s. These were tested on my Dan Nelson calibrated TV-7B. They have been tested for shorts, gas, and transconductance. The tubes test with readings of 80/85 and 85/85. Minimum is 50. They have been sonically tested in my homebuilt pre-amp and are dead quiet with no microphonics. All tubes are tested on my calibrated TV-7/B or on my calibrated Hickok 539C. All of these tubes have been tested for transconductance, shorts, gas, leakage and life. All tubes meet or exceed manufacturer published specifications of transconductance (Gm) for the specified tube type. All tests are tested twice - prior to the listing and prior to shipping. I have been selling tubes on the internet since 1998 and have been working with tubes since the early 1960s. If you have not already done so, please take a moment and look at my feedback. All tubes are 100% guaranteed good on arrival. These are great tubes for your new audio gear, guitar amps and vintage stereo/audio gear. Thanks for viewing my auction. Please check out my other auctions for more audio tubes, ham radio and radio related items, and collectibles for great deals. You can add me to your list of favorite sellers by clicking here. I will ship overseas Regarding Shipping Your tubes will be well packed. All tubes are shipped in white boxes or the original boxes if available. They are than are wrapped in bubble wrap and shipped in a box. I have shipped thousands of tubes all over the world and have not yet had any arrive damaged. Payment must be received with 2 days of the auction close. Foreign bidders are welcome to bid. I will gladly combine auctions to save on shipping when possible. I have sold and shipped electronic equipment and tubes to over 73 countries. I pack items very well. See my feedback and bid with confidence!

Untitled Document 1963 Tung-Sol 6SN7GTB ECC33 Tubes, Matched Pair, NOS Testing You are bidding on a matched pair of 1963 Tung-Sol 6SN7GTB ECC33 tubes. These tubes have triangular black plates and halo getters at the top. They have 1963 date codes. These were tested on my Dan Nelson calibrated TV-7B. They have been tested for shorts, gas, and transconductance. The tubes test with readings of 100/102 and 100/100. Minimum is 50. They have been sonically tested in my homebuilt pre-amp and are dead quiet with no microphonics. All tubes are tested on my calibrated TV-7/B or on my calibrated Hickok 539C. All of these tubes have been tested for transconductance, shorts, gas, leakage and life. All tubes meet or exceed manufacturer published specifications of transconductance (Gm) for the specified tube type. All tests are tested twice - prior to the listing and prior to shipping. I have been selling tubes on the internet since 1998 and have been working with tubes since the early 1960s. If you have not already done so, please take a moment and look at my feedback. All tubes are 100% guaranteed good on arrival. These are great tubes for your new audio gear, guitar amps and vintage stereo/audio gear. Thanks for viewing my auction. Please check out my other auctions for more audio tubes, ham radio and radio related items, and collectibles for great deals. You can add me to your list of favorite sellers by clicking here. I will ship overseas Regarding Shipping Your tubes will be well packed. All tubes are shipped in white boxes or the original boxes if available. They are than are wrapped in bubble wrap and shipped in a box. I have shipped thousands of tubes all over the world and have not yet had any arrive damaged. Payment must be received with 2 days of the auction close. Foreign bidders are welcome to bid. I will gladly combine auctions to save on shipping when possible. I have sold and shipped electronic equipment and tubes to over 73 countries. I pack items very well. See my feedback and bid with confidence!

Hi up for consideration is one ECC33 Mullard , used tube Tested at 6.4 and 6.9 its condition suggests it has not done massive hours and 9ma is regarded as 100% emission It may seem the mutual conductance rates it in the 6+ but the signal (audio) output is quite good The code is unreadable as the yellow print seems to be masking it it has been tested in audio and seems quiet and not microphonic . what you are buying is one tube , thanks for looking. If there is a particular tube you are trying to obtain then send me a message and i will see if i have it .....there are so many tubes to cover that listing can be quite a job to keep up with..... Please note that I can send parcels through budget postage that can save you some cash however ebay will not cover you if the parcel is lost .....Australian economy post does register the item and issues a registration number but does not issue tracking with it .....please send me a message regarding this prior to checkout if you wish to do this. If you choose economy post then YOU become responsible if the parcel is lost and no refunds will be sent for non collection..

Telefunken 6SN7GTA Extremely Rare (Single)Parallel Gray Plates - Top Ring Getter - Medium BottleTESTS NOS on AT1000 for GM, EM & GainThis is the rarest of all 6SN7 tubes. Found in its original box which was totally F.U.B.A.R., I believe this tube to be TRUE NOS but I cant be sure so its listed as a TESTS NOS tube in a white box. Its been thoroughly tested on an AT1000 with all the specs provided. You can see by the pictures that the printing is perfect. This is only the 2nd one of these Ive found in this condition. This is an incredible find. Please Read My Feedback and Buy with ConfidenceI Stand Behind Everything I Sell Amplitrex AT1000 Test Results 95%+ GM = Within NOS Specs 90%+ EM = Within NOS Specs (GM) Mutual Conductance 2600 = SPEC (EM) Emission 8.0 gV = SPEC Noise Test (Mu) Gain TUBE #1 2650/2700 (101.9/103.8%) 8.2/8.4 (102.5/105.0%) 5/5 19.4 20.1 TUBE #2 TUBE #3 TUBE #4 Microphonic Test Scale: 5 = Ultra Low; 4 = Very Very Low; 3 = Very LowTube Gain Specs: 20 Mu (+3 or -3) = Factory Specs BULLz TUBEz About BULLzTUBEz:Ive been an Audiophile for over 50 years, 2 time National Champion in Car Audio and owned a chain of Car Stereo Stores... I have a massive collection of vacuum tubes specializing in mostly audio tubes, especially 6SN7s but I have just about any tube you need. Just check the store for the listed inventory. If you have a request just send a message to NOVA.76 through the eBay messaging system... I stand behind everything I sell... My goal is to Create a Positive Experience for my customers...About My TUBEz:All tubes are tested with the Audiophile in mind for SHORTS, GAS, MUTUAL CONDUCTANCE, EMISSION and NOISE (large tube lots are not tested for noise). All my tubes are tested thoroughly on an Amplitrex AT1000... My backup tube testers are an AVO MKIV and another Amplitrex AT1000... I WILL NOT GUARANTEE THAT MY READINGS WILL MATCH YOUR READINGS... Variations in Line Voltage and Test Equipment excludes any claims regarding matching test results on any equipment other than mine...Warranties:Used or vintage items are sold as is with no warranty beyond the description and photographs provided on the listing. Returns will NOT be accepted for reasons such as: dont like the sound, ordered the wrong item, changed mind, not what I thought it was, wrong color ordered, wrong item ordered or tube readings dont match my tester. Any exceptions are on a case by case basis and subject to a 15% restocking fee... Shipping:Domestic Shipping to the continental United States will be by the US Postal Service (USPS) including free tracking. Some items listed will ship free and will be clearly listed as free Shipping. Items not listed as free shipping will be for the cost of packaging plus shipping only, no extra charge will be added to the USPS fee. INTERNATIONAL BUYERS PLEASE CHECK THE SHIPPING CHARGES PRIOR TO BIDDINGInternational Shipping will be offered for select items and will be clearly identified in the listings Shipping & Payment tab. Shipping will be by the eBay International Standard Shipping and be made available as a shipping option at check-out. Shipping costs to international locations will be paid by the buyer. The shipping and handling cost will be clearly identified at check-out. THERE ARE NO RETURNS ON INTERNATIONAL SHIPPING, apart from the exceptions as dictated by eBay... Please note the following:Import duties, taxes and charges are not included in the item price or shipping charges. These charges are solely the buyers responsibility.Please check with your countrys customs office to determine what these additional costs will be prior to bidding/buying.These charges are normally collected by the delivering freight (shipping) company or when you pick the item up so do not confuse them for additional shipping charges.I do not mark merchandise values below value or mark items as gifts - US and International government regulations prohibit such behavior.

MULLARD ECC33 6SN7GT MATCHED PAIR OF NEW OLD STOCK IN BOX VINTAGE VALVES TUBES BRITISH MULLARD VINTAGE VALVES WITH A WONDERFUL CLEAR WARM SOUND. MADE IN THE MULLARD BLACKBURN FACTORY IN GREAT BRITAIN MULLARD BLACKBURN B FACTORY CODES ETCHED INTO THE GLASS OF THE BOTH OF THE VALVES MADE IN GREAT BRITAIN IN THE 1950S SLIM BLACK BASE WELDED ANODE PLATES CLEAN SHINY METAL PINS RECTANGULAR SHAPED LOWER GETTER THE SAME MULLARD DATE CODES ETCHED INTO THE GLASS OF THE BOTH OF THE VALVES = 5 K 1 B F H MULLARD ECC33 BOXS WITH VINTAGE BROWN CARDBOARD AND TISSUE WRAPPING THESE TUBES TESTED AT 100% STRONG NOS READINGS ON MY HICKOK TV-7 TUBE TESTER TEST RESULTS = 80/80 WHERE GOOD IS 50/50 TESTED FOR GAS AND SHORTS FREE PAY PAL FEES FREE INTERNATIONAL AIRMAIL SHIPPING - EXCEPT TO RUSSIA PLEASE SEE MY EXCELLENT E BAY CUSTOMER FEEDBACK AFTER OVER 12 YEARS OF SELLING VINTAGE VALVES ON EBAY.Philips Holland bought and owned Mullard UK and a many other valve companies in the 1920 - 1960 period. They then branded British made Mullard tubes with their own Philips logo. The British Mullard engineers etched factory codes into the glass of their British made valves,so they knew the difference. *Pope, Valvo, Adzam, Mazda, Amperex, Bugle Boy, Mullard, Miniwatt Dario, and Radiotechnique were all names owned by Philips Holland in the 1950/1960s. The respective names typically referred to factories. For instance, Mullard operated in England. All of these factories may at one time or another produced tubes with various other names attached. Which is why we see Amperex and Mullard tubes made in Holland or Philips branded tubes made in England. Factory codes etched onto the glass or underneath the base of the tube help us to figure this one out.

Tested on Amplitrex AT1000. Test: 2600-2600 New value is 2600-2600 Worked fine in the preamp. See our other auctions for many more tube lots.

Amazing tube that appears to be unused and tests new with original box.

This is a Mullard ECC33 6SN7 vacuum tube. Tests good on TV-7 I am experienced packing large heavy items and will pack this unit to ensure safe arrival at the winning bidders location. I am an extra class amateur operator. I test and describe the items I sell to the best of my ability. If you are not satisfied, you may return the item and I will pay return shipping and issue a full refund including your original shipping cost. Buyer pays actual shipping, seller accepts credit cards though Paypal. Thanks for looking!Additional Information regarding my listings: I sell primarily used electronic items. I make every effort to ship within 3 BUSINESS days of receiving payment. My shipping costs are based on the shipping weight of the item, insurance and the cost of packaging. Shipping costs are calculated automatically by the eBay shipping calculator The shipping cost shown in the auction is an eBay calculation based on the weight of the item and the geographic location of the bidder. Please check the eBay shipping calculator to verify shipping costs before bidding. Inside the US I use Fedex for items over 3lb and USPS priorty mail for items 3lb & under. All international shipments are by USPS Priority mail international. International bidders are responsible for all customs fees. I will not mark items on customs forms as gifts or declare a value lower than the winning bid so please do not ask me to do so. If there is not a buy it now price listed on the item, it means I intend to let the auction run to completion so please do not ask me to end the auction early, that is unfair to other bidders. If an item is listed as no international shipping, I will not ship it outside of the US but will ship to a US address for international bidders. I strive to have all my buyers 100% satisfied. If you have any questions or issues after receiving your item, PLEASE contact me prior to leaving feedback so that I may address them. As a seller, my policy is that I provide feedback after the buyer leaves feedback. If you have any questions not answered here, please contact me prior to bidding. I am a one person operation and will answer all inquiries in as timely a manner as I possibly can. Thanks again for looking at my item. Please note: I have been experiencing a sharp increase in non-paying bidders. Once an auction ends, sellers have to pay auction fees based on the amount of the winning bid, REGARDLESS of whether or not the buyer follows through with payment. When a buyer fails to pay for an item, the only recourse sellers have is to file a non-paying bidder complaint with ebay to have the auction fees paid by the seller refunded. Ebay allows 4 days for a buyer to make payment arrangements before they allow sellers to open a non-paying bidder complaint. If I do not receive payment or otherwise hear from a winning bidder within 4 days, a non-paying bidder complaint will automatically be opened by the EBAY automated seller assistant software. Shipping Address Information: I use the eBay seller assistant to print shipping labels. It copies the address information listed on the buyers eBay/Paypal account. It is the responsibility of the BUYER to ensure that the address listed on their account is current and correct. I will not accept responsibility for a shipment being sent to the wrong address if the buyer provides an incorrect address on their eBay/Paypal account. PLEASE update your account address before bidding and do not send notes, emails, etc expecting me to correct the address that is provided on your account.

Untitled Document 1950s Sylvania 6SN7GTB ECC33 Tall Bottle Chrome Top Tubes, Pair, Tested You are bidding on a matched pair of 1950s Sylvania 6SN7GTB ECC33 Tall Bottle Chrome Top Tubes. These tubes have triangular black plates and foil getters at the top. These were tested on my Dan Nelson calibrated TV-7B. They have been tested for shorts, gas, and transconductance. The tubes test with readings of 90/95 and 80/100. Minimum is 50. They have been sonically tested in my DIY pre-amp and are quiet with no microphonics. All tubes are tested on my calibrated TV-7/B or on my calibrated Hickok 539C. All of these tubes have been tested for transconductance, shorts, gas, leakage and life. All tubes meet or exceed manufacturer published specifications of transconductance (Gm) for the specified tube type. All tests are tested twice - prior to the listing and prior to shipping. I have been selling tubes on the internet since 1998 and have been working with tubes since the early 1960s. If you have not already done so, please take a moment and look at my feedback. All tubes are 100% guaranteed good on arrival. These are great tubes for your new audio gear, guitar amps and vintage stereo/audio gear. Thanks for viewing my auction. Please check out my other auctions for more audio tubes, ham radio and radio related items, and collectibles for great deals. You can add me to your list of favorite sellers by clicking here. I will ship overseas Regarding Shipping Your tubes will be well packed. All tubes are shipped in white boxes or the original boxes if available. They are than are wrapped in bubble wrap and shipped in a box. I have shipped thousands of tubes all over the world and have not yet had any arrive damaged. Payment must be received with 2 days of the auction close. Foreign bidders are welcome to bid. I will gladly combine auctions to save on shipping when possible. I have sold and shipped electronic equipment and tubes to over 73 countries. I pack items very well. See my feedback and bid with confidence!

Untitled Document 1960s GE 6SN7GTB ECC33 Tubes, Matched Pair, NOS Testing You are bidding on a matched pair of 1960s GE 6SN7GTB ECC33 tubes. These tubes have gray ladder plates and side getters. They have 1965 and 1966 date codes. These were tested on my Dan Nelson calibrated TV-7B. They have been tested for shorts, gas, and transconductance. The tubes test with readings of 100/100 and 95/95. Minimum is 50. All tubes are tested on my calibrated TV-7/B or on my calibrated Hickok 539C. All of these tubes have been tested for transconductance, shorts, gas, leakage and life. All tubes meet or exceed manufacturer published specifications of transconductance (Gm) for the specified tube type. All tests are tested twice - prior to the listing and prior to shipping. I have been selling tubes on the internet since 1998 and have been working with tubes since the early 1960s. If you have not already done so, please take a moment and look at my feedback. All tubes are 100% guaranteed good on arrival. These are great tubes for your new audio gear, guitar amps and vintage stereo/audio gear. Thanks for viewing my auction. Please check out my other auctions for more audio tubes, ham radio and radio related items, and collectibles for great deals. You can add me to your list of favorite sellers by clicking here. I will ship overseas Regarding Shipping Your tubes will be well packed. All tubes are shipped in white boxes or the original boxes if available. They are than are wrapped in bubble wrap and shipped in a box. I have shipped thousands of tubes all over the world and have not yet had any arrive damaged. Payment must be received with 2 days of the auction close. Foreign bidders are welcome to bid. I will gladly combine auctions to save on shipping when possible. I have sold and shipped electronic equipment and tubes to over 73 countries. I pack items very well. See my feedback and bid with confidence!

Untitled Document 1955 Raytheon 6SN7GTB ECC33 Tubes, Matched Quad, NOS Testing, Matched Codes You are bidding on a matched quad of 1955 Raytheon 6SN7GTB ECC33 tubes. These tubes have long black ladder plates and D getters at the top. They have matching 1955 date codes. These were tested on my Dan Nelson calibrated TV-7B. They have been tested for shorts, gas, and transconductance. The tubes test with readings of 102/108, 100/95, 98/105 and 100/98. Minimum is 50. They have been sonically tested in my DIY pre-amp and are quiet with no microphonics. All tubes are tested on my calibrated TV-7/B or on my calibrated Hickok 539C. All of these tubes have been tested for transconductance, shorts, gas, leakage and life. All tubes meet or exceed manufacturer published specifications of transconductance (Gm) for the specified tube type. All tests are tested twice - prior to the listing and prior to shipping. I have been selling tubes on the internet since 1998 and have been working with tubes since the early 1960s. If you have not already done so, please take a moment and look at my feedback. All tubes are 100% guaranteed good on arrival. These are great tubes for your new audio gear, guitar amps and vintage stereo/audio gear. Thanks for viewing my auction. Please check out my other auctions for more audio tubes, ham radio and radio related items, and collectibles for great deals. You can add me to your list of favorite sellers by clicking here. I will ship overseas Regarding Shipping Your tubes will be well packed. All tubes are shipped in white boxes or the original boxes if available. They are than are wrapped in bubble wrap and shipped in a box. I have shipped thousands of tubes all over the world and have not yet had any arrive damaged. Payment must be received with 2 days of the auction close. Foreign bidders are welcome to bid. I will gladly combine auctions to save on shipping when possible. I have sold and shipped electronic equipment and tubes to over 73 countries. I pack items very well. See my feedback and bid with confidence!

Untitled Document 1955 Raytheon 6SN7GTB ECC33 Tubes, Matched Quad, NOS Testing, Matched Codes You are bidding on a matched quad of 1955 Raytheon 6SN7GTB ECC33 tubes. These tubes have long black ladder plates and D getters at the top. They have matching 1955 date codes. These were tested on my Dan Nelson calibrated TV-7B. They have been tested for shorts, gas, and transconductance. The tubes test with readings of 102/108, 100/95, 98/105 and 100/98. Minimum is 50. They have been sonically tested in my DIY pre-amp and are quiet with no microphonics. All tubes are tested on my calibrated TV-7/B or on my calibrated Hickok 539C. All of these tubes have been tested for transconductance, shorts, gas, leakage and life. All tubes meet or exceed manufacturer published specifications of transconductance (Gm) for the specified tube type. All tests are tested twice - prior to the listing and prior to shipping. I have been selling tubes on the internet since 1998 and have been working with tubes since the early 1960s. If you have not already done so, please take a moment and look at my feedback. All tubes are 100% guaranteed good on arrival. These are great tubes for your new audio gear, guitar amps and vintage stereo/audio gear. Thanks for viewing my auction. Please check out my other auctions for more audio tubes, ham radio and radio related items, and collectibles for great deals. You can add me to your list of favorite sellers by clicking here. I will ship overseas Regarding Shipping Your tubes will be well packed. All tubes are shipped in white boxes or the original boxes if available. They are than are wrapped in bubble wrap and shipped in a box. I have shipped thousands of tubes all over the world and have not yet had any arrive damaged. Payment must be received with 2 days of the auction close. Foreign bidders are welcome to bid. I will gladly combine auctions to save on shipping when possible. I have sold and shipped electronic equipment and tubes to over 73 countries. I pack items very well. See my feedback and bid with confidence!

Mullard ECC33/6SN7 Black Platte Triode 1 =2150 Triode 2 =2250 100%=2530 Minimun good=1650 Attention please Read the following carefully before making purchases. I do not accept the return of the object for any reason. I repeat no reason. If your intention is to buy you must accept this condition. At the end of the auction do not make the payment. I will send you photos of how your valves will be packed. If you think the packaging is insufficient You can ask for the cancellation of the transaction that will be accepted by me.

1 Vintage Pair Mullard ECC33 / 6SN7GT Valves/Vacuum Tubes - AVO Tested strong. Bottom D getters. Tested for noise in a phono stage as well. One of the best 6SN7 equivalents, throws off a huge soundstage with big mid range holography, adds a sheen to the music. Rare. Lettering good. Tested on a recently calibrated AVO VCM 160 with the following results; IA GMValve 1: A1 8.0 3.7 A2 13.6 3.9Valve 2: A1 10.3 3.8 A2 7.8 3.7 AVO NOS Specs: IA = 9.0 GM = 3.8 No leaks or shorts, solid bases, shiny pins. eBay seller for over 20 years, buy with confidence - see feedback. Valves will be shipped, next day, carefully packaged in white valve boxes, tracked and insured. Please drop a note with any questions. Shipping happily combined on multiple items. For overseas purchases, please message for a shipping quote before purchasing. Dont use your amp as a circuit breaker, buy tested valves!

Untitled Document 1963 Tung-Sol 6SN7GTB ECC33 Tubes, Matched Pair, Tested, Matched Codes You are bidding on a matched pair of 1963 Tung-Sol 6SN7GTB ECC33 tubes. These tubes have triangular black plates and halo getters at the top. They have matching 1963 date codes. These were tested on my Dan Nelson calibrated TV-7B. They have been tested for shorts, gas, and transconductance. The tubes test with readings of 94/96 and 85/95. Minimum is 50. All tubes are tested on my calibrated TV-7/B or on my calibrated Hickok 539C. All of these tubes have been tested for transconductance, shorts, gas, leakage and life. All tubes meet or exceed manufacturer published specifications of transconductance (Gm) for the specified tube type. All tests are tested twice - prior to the listing and prior to shipping. I have been selling tubes on the internet since 1998 and have been working with tubes since the early 1960s. If you have not already done so, please take a moment and look at my feedback. All tubes are 100% guaranteed good on arrival. These are great tubes for your new audio gear, guitar amps and vintage stereo/audio gear. Thanks for viewing my auction. Please check out my other auctions for more audio tubes, ham radio and radio related items, and collectibles for great deals. You can add me to your list of favorite sellers by clicking here. I will ship overseas Regarding Shipping Your tubes will be well packed. All tubes are shipped in white boxes or the original boxes if available. They are than are wrapped in bubble wrap and shipped in a box. I have shipped thousands of tubes all over the world and have not yet had any arrive damaged. Payment must be received with 2 days of the auction close. Foreign bidders are welcome to bid. I will gladly combine auctions to save on shipping when possible. I have sold and shipped electronic equipment and tubes to over 73 countries. I pack items very well. See my feedback and bid with confidence!