Coronado 575 Volume Control Issue

[jr_tech]

I would break the connection between the plate of the 57 and the 1 meg pot and insert a capacitor there, to take the pot out of the DC path. Likely a .05 would be ok in that location.

Are you positive that the speaker voice coil is not rubbing slightly on the magnet?

I would also try a larger value for C-9 for a more mellow tone... perhaps experiment with different values for the most pleasing sound. A "voice/music" switch, with 2 different caps might be fun to incorporate.

What station is that on 620? Many talk/sports stations are over-processed for AM broadcast these days to overcome interference... they don't sound very good, but they can be heard better in fringe/noisy locations.

jr

[dieseljeep]

Originally Posted by jr_tech

I would break the connection between the plate of the 57 and the 1 meg pot and insert a capacitor there, to take the pot out of the DC path. Likely a .05 would be ok in that location.

Are you positive that the speaker voice coil is not rubbing slightly on the magnet?

I would also try a larger value for C-9 for a more mellow tone... perhaps experiment with different values for the most pleasing sound. A "voice/music" switch, with 2 different caps might be fun to incorporate.

What station is that on 620? Many talk/sports stations are over-processed for AM broadcast these days to overcome interference... they don't sound very good, but they can be heard better in fringe/noisy locations.

jr

A few AM stations around here went from all talk, back to playing music. The music always seems to be distorted because of the over-processing.