Pair of STC 4102D tubes, a remarkable find for enthusiasts and collectors alike. Tested on Metrix U61B tube tester which confirms 100% of its original life expectancy remaining. ------------------------------------------------------------------------------------------------------I sell worldwide with prices that vary depending on the location of the buyer. Shipping time may vary depending on your location. All items are shipped with strong and safe boxes.

For sale: 1x 4102D STC Tube. Tube Overview: New Old StockTested: Metrix U61B tube tester, 100% original life expectancyOrigin: Based on Western Electric 102D (1925 design) Made in the UK by STC (Standard Telephones and Cables)Design: Spherical envelope Metal skirted base Faithful to original electrode constructionApplications: High-fidelity audio Collectors itemHighlight: Exceptional sound quality, rare and flawless condition ------------------------------------------------------------------------------------------------------I sell worldwide with prices that vary depending on the location of the buyer. Shipping time may vary depending on your location. All items are shipped with strong and safe boxes.

Introducing a pristine, New Old Stock STC 4102D valve, a remarkable find for enthusiasts and collectors alike. This valve is not merely a piece of history; its a fully functional piece of vintage technology, tested on a Metrix U61B tube tester which confirms 100% of its original life expectancy remaining. Its flawless condition and perfect operation make it a rare gem in the world of vintage electronics. The STC 4102D draws its lineage from the original Western Electric 102D design, conceived in 1925. Bearing the 4 prefix, it proudly signifies its UK manufacture by STC (Standard Telephones and Cables), a testament to British engineering excellence. Despite being of much later manufacture, it remains faithful to the original electrode construction, encapsulated within its iconic spherical envelope and metal skirted base. This design not only reflects the evolutionary journey from the experimental M25, believed to be derived from Western Electric, but also marks a significant chapter in telecommunications history. In 1946, the introduction of the 31/142A by STC as the successor to the 4102D heralded a new era in repeater technology, yet the 4102D remains unmatched in its appeal to collectors and tech aficionados. STCs legacy, intertwined with Western Electrics pioneering technology, underscores the valves historical significance. Highlight: This STC 4102D valve is not only a collectors dream due to its perfect condition and historical value but also stands out as an exceptional choice for high-fidelity audio applications. Its unparalleled quality and performance make it an ideal candidate for enriching your hi-fi audio setup, offering the authentic, rich sound that only vintage technology can provide. Seize the opportunity to own this impeccable piece of technology, a bridge between the past and present, promising to enhance your audio experience with its timeless performance. The STC 4102D valve: where history meets unparalleled audio fidelity. ------------------------------------------------------------------------------------------------------I sell worldwide with prices that vary depending on the location of the buyer. Shipping time may vary depending on your location. All items are shipped with strong and safe boxes.

4102d stc/western electric 102d vt32 tube tennis ball The tube is new never used The test is perfect 100% emission

Introducing a pristine, New Old Stock STC 4102D valve, a remarkable find for enthusiasts and collectors alike. This valve is not merely a piece of history; its a fully functional piece of vintage technology, tested on a Metrix U61B tube tester which confirms 100% of its original life expectancy remaining. Its flawless condition and perfect operation make it a rare gem in the world of vintage electronics. The STC 4102D draws its lineage from the original Western Electric 102D design, conceived in 1925. Bearing the 4 prefix, it proudly signifies its UK manufacture by STC (Standard Telephones and Cables), a testament to British engineering excellence. Despite being of much later manufacture, it remains faithful to the original electrode construction, encapsulated within its iconic spherical envelope and metal skirted base. This design not only reflects the evolutionary journey from the experimental M25, believed to be derived from Western Electric, but also marks a significant chapter in telecommunications history. In 1946, the introduction of the 31/142A by STC as the successor to the 4102D heralded a new era in repeater technology, yet the 4102D remains unmatched in its appeal to collectors and tech aficionados. STCs legacy, intertwined with Western Electrics pioneering technology, underscores the valves historical significance. Highlight: This STC 4102D valve is not only a collectors dream due to its perfect condition and historical value but also stands out as an exceptional choice for high-fidelity audio applications. Its unparalleled quality and performance make it an ideal candidate for enriching your hi-fi audio setup, offering the authentic, rich sound that only vintage technology can provide. Seize the opportunity to own this impeccable piece of technology, a bridge between the past and present, promising to enhance your audio experience with its timeless performance. The STC 4102D valve: where history meets unparalleled audio fidelity. ------------------------------------------------------------------------------------------------------I sell worldwide with prices that vary depending on the location of the buyer. Shipping time may vary depending on your location. All items are shipped with strong and safe boxes.

4102d stc/western electric 102d vt32 tube tennis ball The tube is new never used The test is perfect 100% emission

Introducing a pristine, New Old Stock STC 4102D valve, a remarkable find for enthusiasts and collectors alike. This valve is not merely a piece of history; its a fully functional piece of vintage technology, tested on a Metrix U61B tube tester which confirms 100% of its original life expectancy remaining. Its flawless condition and perfect operation make it a rare gem in the world of vintage electronics. The STC 4102D draws its lineage from the original Western Electric 102D design, conceived in 1925. Bearing the 4 prefix, it proudly signifies its UK manufacture by STC (Standard Telephones and Cables), a testament to British engineering excellence. Despite being of much later manufacture, it remains faithful to the original electrode construction, encapsulated within its iconic spherical envelope and metal skirted base. This design not only reflects the evolutionary journey from the experimental M25, believed to be derived from Western Electric, but also marks a significant chapter in telecommunications history. In 1946, the introduction of the 31/142A by STC as the successor to the 4102D heralded a new era in repeater technology, yet the 4102D remains unmatched in its appeal to collectors and tech aficionados. STCs legacy, intertwined with Western Electrics pioneering technology, underscores the valves historical significance. Highlight: This STC 4102D valve is not only a collectors dream due to its perfect condition and historical value but also stands out as an exceptional choice for high-fidelity audio applications. Its unparalleled quality and performance make it an ideal candidate for enriching your hi-fi audio setup, offering the authentic, rich sound that only vintage technology can provide. Seize the opportunity to own this impeccable piece of technology, a bridge between the past and present, promising to enhance your audio experience with its timeless performance. The STC 4102D valve: where history meets unparalleled audio fidelity. ------------------------------------------------------------------------------------------------------I sell worldwide with prices that vary depending on the location of the buyer. Shipping time may vary depending on your location. All items are shipped with strong and safe boxes.

4019A tube STC western electric british valve 4019A = 4609 SY4019A S4019B VT72 CV249 101D pair triode audio frequency very rare TRIODE BRITISH #POST-RÖHRE TELECOM SLANTED PLATE 45° oldest commercial valves for long distance telephony Socket UV-Base (4 Pins+Bayonet, USA 1914 WE) Filament Heater Vf 4 Volt / If 0.25 Ampere / Direct / Parallel, ~ = (AC/DC) Employ: Telephone repeater tube designed for DC series or parallel supply. Anode volts 130. Dimensions (LxAxP) incl.pins/tip 57 x 114 x mm / 2.24 x 4.49 x inch Weight 65 g / 2.29 oz Socket 4 short pins socket western electric British branch big box plate silver rugged reliable tubes long life ; FULLY TESTED strong emission tube valve lampe röhre tsf ??? ??? HAM RADIO audio hi-end hi-fi diy POWER AMPLIFIER roehre Pre-Amplifier Preamp Pri VINTAGE stereo SE Single Ended PP Push-Pull VACUUM TUBES röhren box 53

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1920s*SUPER RARE* NOS NIB Western Electric 102D / 102-D / 102 ( Similar 102-G 102G ) TENNIS BALL vacuum tube TV-7/u tested! Offered is a WESTERN ELECTRIC 102-D tube which comes with an original 102-G box (not sure if it was originally shipped in this box, but it is included in the sale)! The tube is in lovely condition. All of the gold tips are still present on the pins. The arbor is good, the base is tight and there are no rattles. The glass is perfectly clear and the flashing is nearly perfect. Selling from a rare collection! Tested to be in guaranteed working conditionI tested these on a High Quality Professonal Hickok TV-7/U Tester:TUBEs TEST RESULTs: TUBE: 18 - {Minimum Rating of 13 for TV-7 Testers are equal to 65% of average new ratings.} If you have Questions or Comments contact me on eBay Check out the photos! I Combine ShippingBefore You Pay. I accept PayPal and Postal M O. Please see click to enlarge photos for condition and quality.Check out My Other Items For Sale!WILL BE SHIPPED OUT FAST! Before bidding please read my shipping and return policy. I WILL COMBINE SHIPPING COST ON MY ITEMS!!! NOTE: International buyers - THE BUYER IS RESPONSIBLE FOR SHIPPING FEES. INTERNATIONAL BIDS WELCOME. I WONT CHANGE DECLARED VALUE ON CUSTOM FORMS AND INTERNATIONAL BUYERS ARE RESPONSIBLE FOR ALL TAXES, CUSTOM FEES, and additional shipping fees. ANY RETURN WILL BE ACCEPTED BUT BUYER WILL PAY SHIPPING FEES AND I WILL NOT REFUND ANY SHIPPING FEES. My Return Policy: Will not accept returns for reasons such as ordered the wrong item, change mind, not what I thought It was, wrong color ordered, item ordered. *TESTED ON Calibrated HICKOK TV-7 B/U*{Minimum Ratings for TV-7 Testers are equal to 65% of average new ratings.}ALL tubes will be ran through a Daniel Nelson calibrated HICKOK TV-7 B/U for a full mutual conductance test. This is a world class tester that is calibrated by the Hickok doctor. Its test results are dead on and you can buy with confidence. If you want to know what the exact Gm rating of the tube is please message me.

1920s*SUPER RARE* Western Electric 102-G 102G ( Similiar 102/102D ) TENNIS BALL vacuum tube TV-7/u tested Good & Strong! Offered is a WESTERN ELECTRIC 102-G tube , which was tested on our TV-7/u Tube testers and is a VERY good tube!! The tube is in lovely condition. All of the gold tips are still present on the pins. The arbor is good, the base is tight. The glass is perfectly clear and the flashing is nearly perfect. Selling from a rare collection! Tested to be in guaranteed working conditionI tested these on a High Quality Professonal Hickok TV-7/U Tester:TUBEs TEST RESULTs: TUBE: 16.1 - {Minimum Rating of 13 for TV-7 Testers are equal to 65% of average new ratings.} If you have Questions or Comments contact me on eBay Check out the photos! I Combine ShippingBefore You Pay. I accept PayPal and Postal M O. Please see click to enlarge photos for condition and quality.Check out My Other Items For Sale!WILL BE SHIPPED OUT FAST! Before bidding please read my shipping and return policy. I WILL COMBINE SHIPPING COST ON MY ITEMS!!! NOTE: International buyers - THE BUYER IS RESPONSIBLE FOR SHIPPING FEES. INTERNATIONAL BIDS WELCOME. I WONT CHANGE DECLARED VALUE ON CUSTOM FORMS AND INTERNATIONAL BUYERS ARE RESPONSIBLE FOR ALL TAXES, CUSTOM FEES, and additional shipping fees. ANY RETURN WILL BE ACCEPTED BUT BUYER WILL PAY SHIPPING FEES AND I WILL NOT REFUND ANY SHIPPING FEES. My Return Policy: Will not accept returns for reasons such as ordered the wrong item, change mind, not what I thought It was, wrong color ordered, item ordered. *TESTED ON Calibrated HICKOK TV-7 B/U*{Minimum Ratings for TV-7 Testers are equal to 65% of average new ratings.}ALL tubes will be ran through a Daniel Nelson calibrated HICKOK TV-7 B/U for a full mutual conductance test. This is a world class tester that is calibrated by the Hickok doctor. Its test results are dead on and you can buy with confidence. If you want to know what the exact Gm rating of the tube is please message me.

1920s*SUPER RARE* NOS NIB Western Electric 102D / 102-D / 102 ( Similar 102-G 102G ) TENNIS BALL vacuum tube TV-7/u tested! Offered is a WESTERN ELECTRIC 102-D tube which comes with an original 102-G box (not sure if it was originally shipped in this box, but it is included in the sale)! The tube is in lovely condition. All of the gold tips are still present on the pins. The arbor is good, the base is tight and there are no rattles. The glass is perfectly clear and the flashing is nearly perfect. Selling from a rare collection! Tested to be in guaranteed working conditionI tested these on a High Quality Professonal Hickok TV-7/U Tester:TUBEs TEST RESULTs: TUBE: 18 - {Minimum Rating of 13 for TV-7 Testers are equal to 65% of average new ratings.} If you have Questions or Comments contact me on eBay Check out the photos! I Combine ShippingBefore You Pay. I accept PayPal and Postal M O. Please see click to enlarge photos for condition and quality.Check out My Other Items For Sale!WILL BE SHIPPED OUT FAST! Before bidding please read my shipping and return policy. I WILL COMBINE SHIPPING COST ON MY ITEMS!!! NOTE: International buyers - THE BUYER IS RESPONSIBLE FOR SHIPPING FEES. INTERNATIONAL BIDS WELCOME. I WONT CHANGE DECLARED VALUE ON CUSTOM FORMS AND INTERNATIONAL BUYERS ARE RESPONSIBLE FOR ALL TAXES, CUSTOM FEES, and additional shipping fees. ANY RETURN WILL BE ACCEPTED BUT BUYER WILL PAY SHIPPING FEES AND I WILL NOT REFUND ANY SHIPPING FEES. My Return Policy: Will not accept returns for reasons such as ordered the wrong item, change mind, not what I thought It was, wrong color ordered, item ordered. *TESTED ON Calibrated HICKOK TV-7 B/U*{Minimum Ratings for TV-7 Testers are equal to 65% of average new ratings.}ALL tubes will be ran through a Daniel Nelson calibrated HICKOK TV-7 B/U for a full mutual conductance test. This is a world class tester that is calibrated by the Hickok doctor. Its test results are dead on and you can buy with confidence. If you want to know what the exact Gm rating of the tube is please message me.

1920s*SUPER RARE* Western Electric 102-G 102G ( Similiar 102/102D ) TENNIS BALL vacuum tube TV-7/u tested Good & Strong! Offered is a WESTERN ELECTRIC 102-G tube , which was tested on our TV-7/u Tube testers and is a VERY good tube!! The tube is in lovely condition. All of the gold tips are still present on the pins. The arbor is good, the base is tight. The glass is perfectly clear and the flashing is nearly perfect. Selling from a rare collection! Tested to be in guaranteed working conditionI tested these on a High Quality Professonal Hickok TV-7/U Tester:TUBEs TEST RESULTs: TUBE: 16.1 - {Minimum Rating of 13 for TV-7 Testers are equal to 65% of average new ratings.} If you have Questions or Comments contact me on eBay Check out the photos! I Combine ShippingBefore You Pay. I accept PayPal and Postal M O. Please see click to enlarge photos for condition and quality.Check out My Other Items For Sale!WILL BE SHIPPED OUT FAST! Before bidding please read my shipping and return policy. I WILL COMBINE SHIPPING COST ON MY ITEMS!!! NOTE: International buyers - THE BUYER IS RESPONSIBLE FOR SHIPPING FEES. INTERNATIONAL BIDS WELCOME. I WONT CHANGE DECLARED VALUE ON CUSTOM FORMS AND INTERNATIONAL BUYERS ARE RESPONSIBLE FOR ALL TAXES, CUSTOM FEES, and additional shipping fees. ANY RETURN WILL BE ACCEPTED BUT BUYER WILL PAY SHIPPING FEES AND I WILL NOT REFUND ANY SHIPPING FEES. My Return Policy: Will not accept returns for reasons such as ordered the wrong item, change mind, not what I thought It was, wrong color ordered, item ordered. *TESTED ON Calibrated HICKOK TV-7 B/U*{Minimum Ratings for TV-7 Testers are equal to 65% of average new ratings.}ALL tubes will be ran through a Daniel Nelson calibrated HICKOK TV-7 B/U for a full mutual conductance test. This is a world class tester that is calibrated by the Hickok doctor. Its test results are dead on and you can buy with confidence. If you want to know what the exact Gm rating of the tube is please message me.

One NOS Western Electric 102D tube Made in the U.S. and of vintage 1920’s production. Excellent, NOS-testing tube. Strong Gm and Ip; meets new-spec. Free from gas or shorts. Listened in circuit- quiet with no noise or microphonics. Clean pins and glass. Tight base with no cracks. Still has original gold caps on the base pins. Comes with original box. Dual-tested on a calibrated TV-7D and at real operating voltages on an Amplitrex AT1000 in fixed bias mode, as per WE spec sheet. Tube ran-in for 10 min. before tests to ensure stability. TV-7D test results: Tube #1- 18. Minimum good on TV-7D: 13. AT1000 test results: Gm: 800 µmohs, Ip: 2.0 mA. Nominal, new 102D: Gm: 660 µmohs, Ip: 1.0 mA. Minimum good 102D: Gm: 430 µmohs, Ip: .65 mA. Test parameters- 160v plate, -2.0v grid bias. In conclusion- This tests as an excellent, NOS tube. An excellent addition to anyones collection. Money back guarantee you will not be disappointed. All items are 100% guaranteed to arrive as represented for 30 days upon arrival. We offer a full refund if you are not satisfied. Weve been selling vintage electronics since 1999 with perfect ebay feedback and many happy, satisfied customers. All items professionally packed to arrive safely with no extra handling costs. Our mission is to offer quality-tested tubes to make you happy with your purchase. Terms & Conditions: Payment must be received within 3 days of sale date. Items described to the best of my ability. Shipped by U.S. Priority Mail. If you have questions, please contact me BEFORE purchasing. Thank you!

1920s*SUPER RARE* NOS NIB Western Electric 102D / 102-D / 102 ( Similar 102-G 102G ) TENNIS BALL vacuum tube TV-7/u tested! Offered is a WESTERN ELECTRIC 102-D tube which comes with an original 102-G box (not sure if it was originally shipped in this box, but it is included in the sale)! The tube is in lovely condition. All of the gold tips are still present on the pins. The arbor is good, the base is tight and there are no rattles. The glass is perfectly clear and the flashing is nearly perfect. Selling from a rare collection! Tested to be in guaranteed working conditionI tested these on a High Quality Professonal Hickok TV-7/U Tester:TUBEs TEST RESULTs: TUBE: 18 - {Minimum Rating of 13 for TV-7 Testers are equal to 65% of average new ratings.} If you have Questions or Comments contact me on eBay Check out the photos! I Combine ShippingBefore You Pay. I accept PayPal and Postal M O. Please see click to enlarge photos for condition and quality.Check out My Other Items For Sale!WILL BE SHIPPED OUT FAST! Before bidding please read my shipping and return policy. I WILL COMBINE SHIPPING COST ON MY ITEMS!!! NOTE: International buyers - THE BUYER IS RESPONSIBLE FOR SHIPPING FEES. INTERNATIONAL BIDS WELCOME. I WONT CHANGE DECLARED VALUE ON CUSTOM FORMS AND INTERNATIONAL BUYERS ARE RESPONSIBLE FOR ALL TAXES, CUSTOM FEES, and additional shipping fees. ANY RETURN WILL BE ACCEPTED BUT BUYER WILL PAY SHIPPING FEES AND I WILL NOT REFUND ANY SHIPPING FEES. My Return Policy: Will not accept returns for reasons such as ordered the wrong item, change mind, not what I thought It was, wrong color ordered, item ordered. *TESTED ON Calibrated HICKOK TV-7 B/U*{Minimum Ratings for TV-7 Testers are equal to 65% of average new ratings.}ALL tubes will be ran through a Daniel Nelson calibrated HICKOK TV-7 B/U for a full mutual conductance test. This is a world class tester that is calibrated by the Hickok doctor. Its test results are dead on and you can buy with confidence. If you want to know what the exact Gm rating of the tube is please message me.

1920s*SUPER RARE* Western Electric 102-G 102G ( Similiar 102/102D ) TENNIS BALL vacuum tube TV-7/u tested Good & Strong! Offered is a WESTERN ELECTRIC 102-G tube , which was tested on our TV-7/u Tube testers and is a VERY good tube!! The tube is in lovely condition. All of the gold tips are still present on the pins. The arbor is good, the base is tight. The glass is perfectly clear and the flashing is nearly perfect. Selling from a rare collection! Tested to be in guaranteed working conditionI tested these on a High Quality Professonal Hickok TV-7/U Tester:TUBEs TEST RESULTs: TUBE: 16.1 - {Minimum Rating of 13 for TV-7 Testers are equal to 65% of average new ratings.} If you have Questions or Comments contact me on eBay Check out the photos! I Combine ShippingBefore You Pay. I accept PayPal and Postal M O. Please see click to enlarge photos for condition and quality.Check out My Other Items For Sale!WILL BE SHIPPED OUT FAST! Before bidding please read my shipping and return policy. I WILL COMBINE SHIPPING COST ON MY ITEMS!!! NOTE: International buyers - THE BUYER IS RESPONSIBLE FOR SHIPPING FEES. INTERNATIONAL BIDS WELCOME. I WONT CHANGE DECLARED VALUE ON CUSTOM FORMS AND INTERNATIONAL BUYERS ARE RESPONSIBLE FOR ALL TAXES, CUSTOM FEES, and additional shipping fees. ANY RETURN WILL BE ACCEPTED BUT BUYER WILL PAY SHIPPING FEES AND I WILL NOT REFUND ANY SHIPPING FEES. My Return Policy: Will not accept returns for reasons such as ordered the wrong item, change mind, not what I thought It was, wrong color ordered, item ordered. *TESTED ON Calibrated HICKOK TV-7 B/U*{Minimum Ratings for TV-7 Testers are equal to 65% of average new ratings.}ALL tubes will be ran through a Daniel Nelson calibrated HICKOK TV-7 B/U for a full mutual conductance test. This is a world class tester that is calibrated by the Hickok doctor. Its test results are dead on and you can buy with confidence. If you want to know what the exact Gm rating of the tube is please message me.

Here is a WE 102D tennis ball shaped tube. It has filament continuity. It is a non working tube.. I have been selling tubes for over 30 years and see my positive feedback.I am in my late-70s and realize it is time to do some serious thinning of my collection. Therefore for the next year I will list 100s of antique radios, audio tubes, tube amplifiers, radio parts, and radio tubes, so bookmark my username stonevintageradio and check in each week. For more information on radios, crystal sets, or tubes, as well as more radios or tubes for sale, visit my website StoneVintageRadio. Also, check my other auction items here on Ebay. I happily ship worldwide.SHIPPING/HANDLING RATE: Use Shipping Calculator for Quotes or fixed rate listed in the item description. All items are shipped F.O.B., Deer River, MN, USA--meaning that the sellers responsibility ends when the item has been shipped. If you wish insurance let us know at the time of the sale and we will add in the extra costs. This item/s is sold on a non-returnable basis. This Agreement is governed by and interpreted under the laws of the state of Texas without exception.

1920s*SUPER RARE* Western Electric 102-G 102G ( Similiar 102/102D ) TENNIS BALL vacuum tube TV-7/u tested Good & Strong! Offered is a WESTERN ELECTRIC 102-G tube , which was tested on our TV-7/u Tube testers and is a VERY good tube!! The tube is in lovely condition. All of the gold tips are still present on the pins. The arbor is good, the base is tight. The glass is perfectly clear and the flashing is nearly perfect. Selling from a rare collection! Tested to be in guaranteed working conditionI tested these on a High Quality Professonal Hickok TV-7/U Tester:TUBEs TEST RESULTs: TUBE: 16.1 - {Minimum Rating of 13 for TV-7 Testers are equal to 65% of average new ratings.} If you have Questions or Comments contact me on eBay Check out the photos! I Combine ShippingBefore You Pay. I accept PayPal and Postal M O. Please see click to enlarge photos for condition and quality.Check out My Other Items For Sale!WILL BE SHIPPED OUT FAST! Before bidding please read my shipping and return policy. I WILL COMBINE SHIPPING COST ON MY ITEMS!!! NOTE: International buyers - THE BUYER IS RESPONSIBLE FOR SHIPPING FEES. INTERNATIONAL BIDS WELCOME. I WONT CHANGE DECLARED VALUE ON CUSTOM FORMS AND INTERNATIONAL BUYERS ARE RESPONSIBLE FOR ALL TAXES, CUSTOM FEES, and additional shipping fees. ANY RETURN WILL BE ACCEPTED BUT BUYER WILL PAY SHIPPING FEES AND I WILL NOT REFUND ANY SHIPPING FEES. My Return Policy: Will not accept returns for reasons such as ordered the wrong item, change mind, not what I thought It was, wrong color ordered, item ordered. *TESTED ON Calibrated HICKOK TV-7 B/U*{Minimum Ratings for TV-7 Testers are equal to 65% of average new ratings.}ALL tubes will be ran through a Daniel Nelson calibrated HICKOK TV-7 B/U for a full mutual conductance test. This is a world class tester that is calibrated by the Hickok doctor. Its test results are dead on and you can buy with confidence. If you want to know what the exact Gm rating of the tube is please message me.

1920s*SUPER RARE* NOS NIB Western Electric 102D / 102-D / 102 ( Similar 102-G 102G ) TENNIS BALL vacuum tube TV-7/u tested! Offered is a WESTERN ELECTRIC 102-D tube which comes with an original 102-G box (not sure if it was originally shipped in this box, but it is included in the sale)! The tube is in lovely condition. All of the gold tips are still present on the pins. The arbor is good, the base is tight and there are no rattles. The glass is perfectly clear and the flashing is nearly perfect. Selling from a rare collection! Tested to be in guaranteed working conditionI tested these on a High Quality Professonal Hickok TV-7/U Tester:TUBEs TEST RESULTs: TUBE: 18 - {Minimum Rating of 13 for TV-7 Testers are equal to 65% of average new ratings.} If you have Questions or Comments contact me on eBay Check out the photos! I Combine ShippingBefore You Pay. I accept PayPal and Postal M O. Please see click to enlarge photos for condition and quality.Check out My Other Items For Sale!WILL BE SHIPPED OUT FAST! Before bidding please read my shipping and return policy. I WILL COMBINE SHIPPING COST ON MY ITEMS!!! NOTE: International buyers - THE BUYER IS RESPONSIBLE FOR SHIPPING FEES. INTERNATIONAL BIDS WELCOME. I WONT CHANGE DECLARED VALUE ON CUSTOM FORMS AND INTERNATIONAL BUYERS ARE RESPONSIBLE FOR ALL TAXES, CUSTOM FEES, and additional shipping fees. ANY RETURN WILL BE ACCEPTED BUT BUYER WILL PAY SHIPPING FEES AND I WILL NOT REFUND ANY SHIPPING FEES. My Return Policy: Will not accept returns for reasons such as ordered the wrong item, change mind, not what I thought It was, wrong color ordered, item ordered. *TESTED ON Calibrated HICKOK TV-7 B/U*{Minimum Ratings for TV-7 Testers are equal to 65% of average new ratings.}ALL tubes will be ran through a Daniel Nelson calibrated HICKOK TV-7 B/U for a full mutual conductance test. This is a world class tester that is calibrated by the Hickok doctor. Its test results are dead on and you can buy with confidence. If you want to know what the exact Gm rating of the tube is please message me.