Marconi B36 , FD 4 , Metal Base Valve x1Tested workingThese items will be well packed for UK, Worldwide ShippingPlease do not hesitate to ask any questions. Thank you

Marconi B36 , GG 4 , Metal Base Valve x1Tested workingThese items will be well packed for UK, Worldwide ShippingPlease do not hesitate to ask any questions. Thank you

A Marconi 6SN7GT/B65 Valve Very rare early metal base 6SN7GT/B65 with clear glass. Black plate and cup getter. Tester AVO VCM Ia1 = 8.5(mA), gm1 = 2.4(mA/V)Ia1 = 9.5(mA), gm1 = 2.6(mA/V) NOS specification: Ia = 9.0(mA) gm = 2.6(mA/V) *** This valve has also been tested in amplifier without any noise. *** Postage Costs I am happy to post this item to worldwide and combine postage cost on multiple purchases.

A marconi B65 6SN7GT valve with spot welded black plates, silver rods, clear top and a square getter. The date code is LK 4, dating the valve to October 1955. Tested very good. The valve has been tested on the Amplitrex AT1000 and the test results are shown in the photos. Please read the condition section as this forms part of the description. Unpacked weight is 0.035 kg. Note on the gas test reading from the user manual for the tester:In the case of small pre-amp valves anything more the 0.1 milliampere will likely cause problems. With a power tube the interpretation must be different. Power tubes typically show a few milliamperes of gas induced current increase, even if they are good. This is because in these tubes, plate temperatures are generally much higher and there is more surface area on the plate and other tube components which naturally outgas somewhat as it heats up. Also, because these tubes operate with several tens of milliamperes, or even over 100 milliamperes, a few mA of gas current is ok. With power tubes, a gas-induced current increase of less than 10% of normal plate current is ok in most application circuits. For UK Shipping. Please note shipping in the UK where possible will be using Royal Mail. However, due to the new size restrictions implemented by the Royal Mail which has resulted in very large increases in P&P costs for certain items, they will be shipped via courier using a drop centre which will increase the delivery time. For Overseas Shipping. The item will be shipped Signed For for overseas. Packages weighing over 2kg will be sent via International Signed For Courier. Combined postage is offered on all items and is based on the packed weight. Shipping costs for all returns are at the Buyers cost unless the item was misdescribed in the original listing or this was not covered in a subsequent question or revision to the listing. Overseas bidders are responsible for settling any Customs Duties or Fees on items they purchase.

Marconi B36 , FD 4 , Metal Base Valve x1Tested workingThese items will be well packed for UK, Worldwide ShippingPlease do not hesitate to ask any questions. Thank you

Marconi B36 , GG 4 , Metal Base Valve x1Tested workingThese items will be well packed for UK, Worldwide ShippingPlease do not hesitate to ask any questions. Thank you

Marconi B36 , FD 4 , Metal Base Valve x1Tested workingThese items will be well packed for UK, Worldwide ShippingPlease do not hesitate to ask any questions. Thank you

Normal 0 false false false RU X-NONE X-NONE MicrosoftInternetExplorer4 British made Marconi Osram BL63 double triode. Double heater power compared to 6SN7, otherwise electrically compatible. Sounds absolutely fantastic. See my other listings for more quality vintage. Tracked shipping worldwide.

Marconi 6SN7GT Twin-T black plate with copper rods bottom D getterTested Hickok 539C (1640 is minimum good reading, 2625 is approx NOS new value) Results: 3100/3090 118% 118%#3319 3100 at 4.1ma* 3090 at 4.1ma* Life test VERY STRONG 2660 / 2770 * ma ratings here are actual measured AC plate current, which is relative to transconductance and is for the Hickok 539C tester, not comparable to any other tester like Amplitrex or Maxi-Preamp. I use these readings to try and match tubes and test for tube life at reduced filament voltages. Your tube(s) will be shipped withing 5 business days, usually faster USPS First Class Packagewith tracking number. Ill combine shipping and provide refund of extra shipping charges. Thank you!

Marconi U78, 6X4 Square Getter Valves x2Tested workingThese items will be well packed for UK, Worldwide ShippingPlease do not hesitate to ask any questions. Thank you

Osram /Marconi B36 CV925 Metal Base x6 Valves TubesFor Quad Leak Decca Valve Tube AmplifiersVery Rare Osram & Marconi B36 x6 Valves Tubes - Made In EnglandAll Valves Tested Working - Rare Set of B36 Metal Base Valves Worldwide Postage The B36 is an audio double triode with a 12.6?Volt heater. It is a British (M-OV) copy of the American 12SN7.The construction uses a glass pinch and two separate electrode structures are visible within the glass.The B36 was designed for audio applications and the valve has independent cathodes. The B65 differs only in heater voltage and current.The wide glass tube envelope is 28?mm in diameter and excluding the IO base pin length, stands 71?mm high.References: Data-sheet & 1040. Type B36 was first introduced in 1948. See also 1948 adverts.

Osram /Marconi B36 CV925 Metal Base x6 Valves TubesFor Quad Leak Decca Valve Tube AmplifiersVery Rare Osram & Marconi B36 x6 Valves Tubes - Made In EnglandAll Valves Tested Working - Rare Set of B36 Metal Base Valves Worldwide Postage The B36 is an audio double triode with a 12.6?Volt heater. It is a British (M-OV) copy of the American 12SN7.The construction uses a glass pinch and two separate electrode structures are visible within the glass.The B36 was designed for audio applications and the valve has independent cathodes. The B65 differs only in heater voltage and current.The wide glass tube envelope is 28?mm in diameter and excluding the IO base pin length, stands 71?mm high.References: Data-sheet & 1040. Type B36 was first introduced in 1948. See also 1948 adverts.

Marconi U78, 6X4 Square Getter Valves x2Tested workingThese items will be well packed for UK, Worldwide ShippingPlease do not hesitate to ask any questions. Thank you

Osram, Marconi Grey Glass B36 Metal Base Valves x6Tested workingThese items will be well packed for UK, Worldwide ShippingPlease do not hesitate to ask any questions. Thank you

Marconi U78, 6X4 Square Getter Valves x2Tested workingThese items will be well packed for UK, Worldwide ShippingPlease do not hesitate to ask any questions. Thank you

Marconi U78, 6X4 Square Getter Valves x2Tested workingThese items will be well packed for UK, Worldwide ShippingPlease do not hesitate to ask any questions. Thank you

Marconi KT33C Grey & Metal base, Valves x3Brown & Metal base, Tested workingThese items will be well packed for UK, Worldwide ShippingPlease do not hesitate to ask any questions. Thank you

Marconi KT33C Grey & Metal base, Valves x3Brown & Metal base, Tested workingThese items will be well packed for UK, Worldwide ShippingPlease do not hesitate to ask any questions. Thank you

MARCONI B65 VALVE WITH D-GETTER AND BLACK BASE Classic British valve tested good with a Mercury tester: 71%/71% (see photos). No shorts or leakage. Marconi red label is just about still visible. Code says 4J3. All items are packed carefully and despatched within two days. If you have zero (0) feedback and intend to bid, please contact me first. Buyer is responsible for any customs or tax charges. Thank you for your interest - happy eBaying :)