[Harp-L] Low Pass Filter with significant volume drop

[Derwood]

I had created a tone knob in a box for my Pignose Amp to cut the highs and
reduce feedback. It worked great until I tried it with my wireless. Then it
did nothing. So I had the great idea of putting the capacitor into my
microphone before the wireless. I tested it first by putting the tone knob
in a box between the mic and the wireless. It worked, so I got some
on/off/on dpdt switches and some .01mp and .02mp capacitors and made a 3
option low pass filter,

While I assembled it I tested it with the pignose because it was easy to
put on my workbench. It worked great. Feedback in the middle capacitor
bypass position and no feedback when either capacitor was engaged. I put it
in 3 mics. A CR with an A500 volume pot, a turner ceramic with an A500
volume pot  (The 1M pot broke when I was putting it together) and a NOS
ceramic element with a 1M volume pot. All three worked great with the
pignose.

Though the pignose was the initial use case, I thought this would be a
great solution for jams and such when I have no control over the rig I plug
into.

Then I took them downstairs and plugged them into my Sonic Pipe Windy City
and the CR worked great. But the other two had a huge volume drop when I
engaged the capacitors. I went back to the pignose and they both worked
great. I tried them with a cable to see if it was the wireless and got the
same volume drop. I tried it on another tube amp and got the same issue.

I am a bit baffled. Could it be the interaction of the impedances of the
element, volume pot and amplifier? Do I need to change out the volume pot?
Why does it work with the pignose but not other amps? Any electrical
expertise would be appreciated.


Derwood

Derwood
derwood.blues at xxxxx
verbis defectis musica incipit