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RE: effect of AC heating on 45 DHT filaments ...w/graph

Posted by deathtube 667 on June 19, 2015 at 17:04:51

In Reply to: RE: effect of AC heating on 45 DHT filaments ...w/graph posted by rage on June 19, 2015 at 14:27:32:

I recently switched to a C4S 12AX7 driver stage running at 2.25mA.

At 1.15W power output measured across the OPT secondary, the driver stage produces .56% THD.

Voltage gain = 60

Bandwidth -3dB @ 34.2KHz

AC DHT filaments are definitely adding something to the music signal.

I could see lots of sidebands coming up around various harmonics just above the noise floor.

Perhaps there are ways to clean up the AC coming into the filaments I could try before resorting to DC filaments again.

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