Tung Sol 12SN7 round plate oval mica. 6SN7 family tube. Matched pair.

Up for auction is a perfect pair  (2 pcs.) of TUNG-SOL 12SN7GT round-plate tubes, OVAL MICA (!).

TUNG-SOL 12SN7 round plate, black glass PAIR (matched) . One of the best tube of 6SN7 & 12SN7 family. But remember - this is different filament (12 volts) than 6SN7 (6 volts). If You have amp or preamp with 6SN7, you need an additional filament transformer and some help from DIYer.

These tubes are NEW (NOS / NIB in original boxes).

Test very good: 11mA/10.5mA and 11mA/10,5mA, on calibrated (02.2019) Elpo p-508 tube tester with 5 mA being the minimum value, 9mA is new ). Remember that these are completely new tubes. They are not warmed up, so the emission values could be even higher later.

Detailed measurements:

Tube 1:

Ia1=11mA, S=3,3mA/V , S(for 9mA)=2,9mA/V

Ia2=10,5mA, S=3,1mA/V , S9for 9mA)=3mA

new Ia = 9mA, new S=2,6mA/V

Tube 2:

Ia1=11mA, S=3,2mA/V , S(for 9mA)=2,9mA/V

Ia2=10,5mA, S=3,2mA/V , S9for 9mA)=2,9mA

new Ia = 9mA, new S=2,6mA/V

These have an oval mica version.

Tung-Sol Round Plate works in the first computer - ENIAC (6v version: 6SN7)  :)  Because in the '40s it was the best tube of this type (and in my opinion is so far).

Will ship from Warsaw, Poland by Express Mail Service (7-10 day delivery to the US, 5-7 days to EU). The postage is $15 with tracking and insurance.

Thank you very much for looking!

RETURNS:

ITEMS MUST BE RETURNED WITHIN 14 DAYS.

BUYER PAYS ALL COSTS INCURRED IN RETURNING THE ITEM.

GOODS MUST BE IN THE SAME CONDITION AS SUPPLIED.

WARNING:  Returns will not be accepted in the event of damage to the parcel in transport and ACCEPTANCE of the parcel by the recipient! In the situation of complete destruction, partial damage or even the appearance of a parcel suggesting damage to objects inside - please do not pick up the parcel! Only, in this case, the insurer will be able to reimburse the costs of damage and it will be possible to get the payment of the amount of money you have paid.