SET Asylum

RE: Volume control

74.220.74.24

In Reply to: RE: Volume control posted by StevenJ on June 30, 2009 at 18:59:50

Just to be safe you should look at the schematic for the preamp to make sure the are compatible.

Here is a situation I ran into. I built an RCA phono stage that had enough gain to drive directly into my amps. It was one of my first projects and I didn't think about it much when I built it. Both the phono stage and the power amps had volume controls. I noticed it sounded different when I compared two scenarios of volume up and down. Looking at the phono schematic (see link) I realized that the output had a coupling cap before the volume control. This is fine if you are driving directly into a grid of another tube (almost no current flow). But with the volume pot at the input of the power amp, I effectively set up a high pass filter with the roll off frequency tied to the phono volume pot.

With a preamp you are probably fine, but you might want to check the schematic to see that you don't have this problem.

Dan

phono stage (Open in New Window)

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