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Re: diode dampener bias comparo

I never considered damper diodes...great idea! That would really give you a slow start on the output tube.

I noticed a huge reduction in hum using a rectifier tube (DC heated) on the cathode. I also noticed a loss of low end. It's also strange that the tube, a 2A3, came up to the correct current draw but the voltage drop across the rectifier was not what I expected. I was shooting for 50 volts and measured only 35.

In your case, I wonder about the changes the Hexfreds have made. Could it be the sound of them in the power supply or the additional B+ that contributes to the change in tone? Only one way to find out-keep the dampers in the PS and then do the comparison with another pair on the cathodes.


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