[sdiy] OBX trimming (was Polyphonic tonal disorder!)

[John Mahoney]

No worries, there was no hurry. ;-) Thanks for the information.

I know that Tony Clarke has worked on a number of OBs and he's got a 
favorite replacement unit, though I don't know what it is.
--
john


At 11:04 AM 5/4/2007, Steve Lenham wrote:

>From: "John Mahoney" <jmahoney at gate.net>
>
>>While we're on the subject, do you have a favorite replacement 
>>trimmer for the OB-X?
>
>Hi John,
>
>Sorry - I'm a bit bit behind in replying to this one.
>
>The OBX I worked on had a mixture of cermet trimmers for critical 
>adjustments and carbon ones elsewhere. Although the generally held 
>opinion seems to be that they are a major weak point, all bar one of 
>the trimmers in this machine were in generally good shape and I was 
>able to calibrate it tightly enough to please my client.
>
>I would go for cermet trimmers in all positions, but wouldn't be 
>fussy about exactly who made them. The one I used recently was from 
>a range of unbranded cermets supplied by Rapid Electronics in the UK.
>
>If you are replacing original trimmers, beware the slightly unusual 
>footprint. They need 10x5mm pin spacing, which is common in carbon 
>trimmers, but most cermets are 5x5 or even 2.5x5. Obviously, if you 
>are adding something (like a resonance trim) then you can use 
>whatever you like - sealed multiturns are great if money is no object.
>
>HTH,
>
>Steve L.


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