Diamond Bottom, Telefunken ECC81. Labeled for Fisher.

Listening tested for excessive noise & microphonics in a Maxi-Preamp 2 tube tester.

Tests 3700/4000 where 2600 is good on a calibrated Hickok 539-B.

Shipping includes insurance.

All tubes guaranteed to test good or may return.

Please see our other items for more vintage tubes & audio.

We combine orders for shipping.

We do not change values for customs.  

Thank You.