Traynor Smaill Block 500H

[GordB]

Hello everyone.

I have this Traynor bass amp here and have a question about the buffering on the input stage.

It looks like a high pass filter of some sort but I can't figure out what frequency.

Could someone please take a peek and let me know?

I've attached the schematic.

[J M Fahey]

Sort of.
You have 2 nets there:

1) input cap .033 and 1M resistor to ground: 5Hz , so just a DC separation, no effect on audible frequency response.

2) the Op Amp has gain, (10k/10k)+1=2X
Then it has an added high boost: 18nF in parallel with 10k which starts rising gain above 880Hz and stops at 5X that (.018 in series with 2k) or 4kHz.
A classic bright boost, to give it clarity and definition.

[GordB]

Thank you JM.