Posted by Damir [ 213.202.68.198 ] on January 20, 2005 at 12:26:47:
In Reply to: Re: Schematic - first version posted by paba on January 20, 2005 at 11:36:46:
It`s hard to avoid the pot - various sources have various output voltages, say from 100mV to 2Vrms. Amplification of our preamp is about 16 or so, and if we don`t have the control, then output voltage from the preamp is 1,6-32Vrms! The typical sensitivity for the full output of power amp can be 1-2Vrms, sometimes lower. We can put the pot at the input, or at the output of the preamp, better on the input.
If too much amplification is the problem (high output sources), we can use lower-mu tube, say 12B4A, but then we must change the operating point...
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