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
Originally posted by Fletcher: Mark, they all had/have "trim pot
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.
Originally posted by MPlancke: I had always assumed the ones wit
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".
If you want to be faithfull to the classic Neve sound, then you
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.