What is this?

[Structo]

This is a photo of a Ceriatone HRM.

I noticed this mini switch on the back panel under the OD trimmer control.

Anybody know what this is or what it does?

[tubedogsmith]

Looking where the two white wires go I'd guess it's some sort of NFB switch.

[Structo]

Ahh, that makes sense.

[rogb]

Not easy to see but either an LNFB lift or HRM lift I would guess.
Some Ctones have the LNFB lift as standard, but you can get em as a custom add on.

Had a closer look - well done that man, looks like an NFB lift!

[crbowman]

Maybe a 'Soul Control'?

[Structo]

Ah, now I see one of the white wires looks like it's going to the impedance switch.

How about the resistor is that a 1K3? (brown, orange, red?)

Is that just for anti-pop?

I used a switched pot for my presence control pot on my ODS.
All the way counter clockwise is off.

Really adds a lot of rawness to the tone.

[groovtubin]

This is a photo of a Ceriatone HRM.

I noticed this mini switch on the back panel under the OD trimmer control.

Anybody know what this is or what it does?

Looks like the HRM OD TRIM pot, see the 4.7K to ground off the gnd lug?

jim@Omegaamps

[guitardude57]

Maybe it is a switch to defeat the outside trim pot, to a default setting....
Crank the pot above the norm to get more grindy... hit the switch to put it back to default.

Or... a nfb switch.

Guess I need to see what c-tone is doing on the schematic to be sure.
So I am guessing at this point.

Moments later:

OK. looked at their layout.

The switch is missing on that.

Their HRM has a 250K trimmer on the board (OD) that runs to the Trim pot on the back. Looks like the switch is a defeat, to bypass
the back pot to the on board trim pot setting.

Their HRM 100 Mk2 has a 100K trimmer...also with back panel pot.
Their Bluesmaster has no on board OD trimmer, only the pot on back.

Alrighty then...