1

EQP501 Passive Equalizer / Re: Switch issue

« on: January 12, 2026, 12:09:01 PM »

I changed the switch and now it works perfectly...thanks

2

EQP501 Passive Equalizer / Re: Pot issue

« on: December 14, 2025, 11:46:52 AM »

Thanks, I understand, but that's not the problem. It's hard to explain...
When I move the AT pot, the kHz switch doesn't move from its position (20 kHz). It simply goes into bypass while at 20 kHz. It also does this at 15 kHz, but less frequently.
  It seems that when I move the AT pot, something shorts out or loses contact, on the switch causing it to go into bypass.
I could send you a short video

3

EQP501 Passive Equalizer / Switch issue

« on: December 13, 2025, 06:31:13 PM »

Hi...my first post here.

This week I built my first kit, an EPQ501...it's been a lot of fun and very rewarding.
I just have one final problem with the top pots..."att and kHz"
When I set it to the right at 20kHz and slightly adjust the "att" pot, the EQ goes into bypass...it's a mechanical issue.
I've resoldered the stepped pots, but it's still the same. It seems like a short circuit inside the pot itself.
..I don't know.