Skip to main content

I'm putting together a 1272 class A from the 183 circuit and the input and output transformers. Is there anyway to avoid building the gain switch? Would a 5k pot work instead, like the one on the output?

Comments

MPlancke Sat, 06/02/2001 - 16:36

If you want to be faithfull to the classic
Neve sound, then you need a dual switched pot
with resistors that change the gain of the two stages. Like the 1073, except the 1272 doesn't have a third gain stage.

You can install a pot which some 1272's had in them when they were used as talkback amps, etc.

MPlancke Sun, 06/03/2001 - 02:11

Originally posted by Fletcher:
Mark, they all had/have "trim pots" [1272's that is]...some of them have knob caps, most are recessed and often behind a rubber plug so nobody fucked with the pot.

Okay, I was talking about the 1272's that have an actual volume control knob on the outside which takes that gain down to zero and up to the limit.

I have a 1272 with a factory installed gain pot like this.

I had always assumed the ones with the recessed pot were simply trim controls which would allow you to change the overall gain +/-6db or so.

Guest Sun, 06/03/2001 - 03:41

Originally posted by MPlancke:
I had always assumed the ones with the recessed pot were simply trim controls which would allow you to change the overall gain +/-6db or so.

An incorrect assumption. It's the same pot, just has a shorter shaft and requires a screwdriver for changing the level. If you relocate the mounting of the pot from the "underplate" to the "faceplate" and put a knob cap on it...change a couple of internal resistors...you have the quintessential "repackaged 1272".