ShortCuts

Troubleshooting the Preamplfier

I will put up schematics and stuff on the preamplifier as well. However, first a few tips, based on real cases I've had the recent years.

1. "Scraping" in volume control

This is due to DC leakage through the coupling capacitors, out from the RIAA stage, and in to the line stage.  Replace the RIAA output electrolytes with 2,2 uF polyester, and the line stage input capacitors with 0,68 uF polyester. Remove the 100k loading resistors.