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RE: help with Dynaco Pas line stage circuit check

The reason for increasing the size of the output coupling cap to .22UF might be just for that reason of DC blocking but it also increased the bass rolloff to a lower frequency. I'm sure the preamp can handle it.

My suggestion would be tofollow the Curcio instructions right to the letter but in my opinion I have a better circuit that was used many years back by Audio Dimensions in the Tu Be or Not Tu Be manual. I did like the results much better than stock but I think you had to increase the B+ to 400VDC. They tell you how in their manual. And if I am not mistaken there was no global feedback which is a huge plus IMHO.

I would rebuild the preamp you have using the values listed on your schematic without the feedback loop and see how it sounds, also increasing the output coupling cap to .22UF.

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