Two 6J5 versus one 6SN7 - Page 2 - diyAudio
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Old 4th August 2008, 09:59 PM   #11
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Wink I'd use the 6J5

but then I just bought 20 of them NOS and a cluster of NOS octal sockets, so I don't have much choice...
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Old 4th August 2008, 11:25 PM   #12
wa2ise is offline wa2ise  United States
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Use DC on the 6SN7 heater, then that hum problem should go away.

Either rectify and filter the 6.3VAC heater supply, or if the output tubes draw enough current, you could use the 6SN7 heater as part of the output cathode resistor.

Another trick to consider is to disconnect the 6.3VAC supply from ground, and to bias it up about +40V. Making the heaters more positive than the cathodes tends to reduce hum leakage. .
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