Zenith K731

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Zenith K731

David
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Posts: 1,418
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Joined: Jan 2014
City: Wellborn Florida

01-03-2016, 10:01 PM

Paul, I have a similar Z set the 12DT8 tube is a pain. I have had several NOS fail after maybe 50-100 hours went to using 12AT7, ECC81 which are current production. The BIG DIFFERENCE is pin 9 on the ECC81 is center tap to the heater, on 12DT8 pin 9 is internal shield to ground. One must remove the ground connection from pin 9 of the tube socket or kiss your new tube good bye in a flash.

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Zenith K731 - by Paul Philco322 - 01-03-2016, 06:51 PM

RE: Zenith K731 - by Phlogiston - 01-03-2016, 07:32 PM

RE: Zenith K731 - by Radioroslyn - 01-03-2016, 07:53 PM

RE: Zenith K731 - by Paul Philco322 - 01-03-2016, 08:58 PM

RE: Zenith K731 - by David - 01-03-2016, 10:01 PM

RE: Zenith K731 - by John Bartley - 01-03-2016, 10:05 PM

RE: Zenith K731 - by titan1a - 01-03-2016, 11:43 PM

RE: Zenith K731 - by VntgRads - 01-04-2016, 02:48 AM

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