DR normal channel problem

[Doc Stitches]

The hum is quiet now ( adjusted bias, a little lead dress, and added 2 100 ohm resistors to pilot heaters.

Normal channel has pot problems with treble and bass.

Volume and sound are great but can't adjust treble or bass. Solder joints are good, with correct wiring.

Doc

[Enzo]

Look for an open connectionbetween the bottom control and ground.