Yes, wiring is as shown on schematic
Yes bass "in" boost the bass response.
Please confirm: 1, the wiring is actually as shown on the diagram.
2, the bass boost is present with the switch in the IN position.
If so I am thoroughly puzzled.
If the hum is 60Hz I wonder if filament current is getting in
somehow. One side of the filament returns through chassis ground. I have
had a cases where a poor ground in the filament return caused 60 Hz hum.
Don't know why the Bass switch would change it.
On 2/17/2025 5:59 PM, thoyer via groups.io wrote:
Time to re-evaluate where I¡¯m at and what I¡¯ve tried, yes the hum is
still there¡¡.
Tried three different 6SC7¡¯s no noticeable difference between each one.
Confirmed the wiring of the switch agrees with the schematic. I have no
reason to suspect that the wiring was changed by a PO at the switch ¨C
looks original to me.
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
