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gain control for Neve preamp

Member for

20 years 6 months
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

Member for

20 years 8 months

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.

Member for

21 years 2 months

Guest Sat, 06/02/2001 - 17:12
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.

Coldsnow, if you have a drawing/manual section for the 1272...follow it. If you don't, get one.

Member for

20 years 8 months

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.

Member for

21 years 2 months

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".
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