Amperex 7308 USN-CEP PQMatched Pair, Test NOS, Made in USA,usedAmperex 7308 USN-CEP PQ Matched Pair, Test NOS, Made in USA, Gold PinUp for your consideration are matched pair of WHITE LABEL Amperex 7308/E188CC USN-CEP vacuum tubes with gold pins. These are Made in USA in 1964. These highly sought-after (with a good reason) Wh...175.00

Amperex 7308 USN-CEP PQ Matched Pair, Test NOS, Made in USA, Gold Pin [Expired]


no longer for sale

Up for your consideration are matched pair of WHITE LABEL Amperex 7308/E188CC USN-CEP vacuum tubes with gold pins. These are Made in USA in 1964.

These highly sought-after (with a good reason) White Label 7308's are made for US Navy, and they are exactly the same tubes as Amperex White Label PQ 7308 tubes. (only with tighter and more stringent military spec)

They have "VR" code which indicates 7308 type tubes.
Etched Date Codes: VR5*4C (March 1964) & VR5*4E (May 1964).
Etched number on tubes: 412 & 420 (12th and 20th week of 1964, only 8 weeks apart).

My most favorite 7308 tubes, Quiet, Dynamic and Warm.
Many consider Amperex 7308 tubes the best of the best in 6DJ8 family tubes.
Rated to have 10,000 hours useful life!

Very tightly matched!
Extremely low noise - tested in actual preamp!
Guaranteed!

I have more of these wonderful sounding tubes, so please ask if you need more than one pair.

Paypal add 3.5%.

I guarantee excellent performance, so buy 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)

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Shorts, Gas: passed

Noise Test: passed with excellent noise and microphonic characteristics

Gm Test:
Tube #1 Triode Section 1: 13300
Tube #1 Triode Section 2: 13800
Tube #2 Triode Section 1: 13500
Tube #2 Triode Section 2: 13300

Where minimum good is 7000 and spec for new is 12500

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Excellent performance guaranteed, so buy with confidence (full refund if not satisfied).

First Class Mail shipping within US with tracking is $4.
USPS International First Class Mail is $12 ($10 to Canada).

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.

All tubes are installed into an actual audio circuit to screen them for internal tube noise/micorphonics. This is especially important with the 6DJ8/6922/7308 tubes. Excessively noisy or/and microphonic tube issues would make them unsuitable for usage in a phono stage or in high-gain line stage preamps.

Music Reference RM-4 pre-preamp (moving coil head amp with 30 db gain) is used for "in circuit"/real world noise/microphonic testing. This unit uses two 6DJ8/6922/7308 vacuum tubes. Each channel uses both triode sections making it ideal tool for noise/microphonic testing of both triode sections.

sojs 

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