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> EF86 / 6267 marked "amperex" pentode nos vacuum tube
EF86 / 6267 marked "amperex" pentode nos vacuum tube
EF86 / 6267 Amperex Pentode NOS vacuum tube.
This one is marked - made in Holland. I have not seen silkscreening like this before on an Amperex tube. The structure looks very much like Sovtek or Svetlana. This tube may be counterfiet but in any case the Sovteks never tested this nicely or had curves this smooth. So in the end you would be getting a great tube that has hard test data available at a good price for an EF86.
If you know EF86 tubes you know that NOS EF86 tubes are closer to spec than current production tubes and have a proven service life far in excess of current production tubes.
If you have a Matchless DC-30 type amp, Bad Cat, Dr. Z, Vox AC15 or AC30/4 or one of the many high end boutique amps that use this pentode this is a great tube for those amps.
You generally will not find many tube vendors that can test these tubes let alone provide test results and curve traces as various bias voltages.
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