Pair Siemens E188CC 7308 Germany Matched Tubes NOS

Siemens E188CC / 7308 matched pairs labeled as RCA and made in Germany.
These tubes are most likely NOS by looking at test results.
Excellent transparant sound with tube warmth.
Date code in metal plate inside of the tubes is G4 9K on both tubes.

I have 1 more of identical tube if you need trio.

Many consider 7308 the best of the best in 6DJ8 family tubes.
Rated to have 10,000 hours.

Test better than spec for new!
Tightly matched (all 4 sections are within 4%)!
Low noise!
Guaranteed!

Paypal add 3.5%.

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Shorts, Gas and Noise: passed

Noise Test: passed with very good noise and micorphonic characteristics

Gm Test:
Tube #1 Triode Section 1: 13800
Tube #1 Triode Section 2: 14200
Tube #2 Triode Section 1: 14000
Tube #2 Triode Section 2: 13700

Where minimum good is 7000 and spec for new is 12500

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I guarantee excellent performance, so bid with confidence.
If you are not satisfied with my tubes for any reason, I will issue full refund for your purchase price.
(Buyer pays for return shipping)

Priority Mail shipping within US with delivery confirmation is $5.90.
Priority Mail International Small Flat Rate Box shipping is $13.45.
First class mail will cost less. I can ship by First class mail if requested.

All tubes are tested by Hickok 539C vacuum tube tester. This tester was precision calibrated by Roger Kennedy to improve measurement accuracy. 83 and 5Y3 tubes were replaced by Solid State rectifiers to minimize calibration drift in the tester.

I also perform listening tests on these tubes using Music Reference RM-4 pre-preamp (moving coil head amp), which has 30 db gain. This unit uses two 6DJ8 tubes (one for each channel). Each channel uses both sections of the 6DJ8 tube.