[sdiy] Minimoog Query - Decay pots

[Tom Bugs]

Thanks Keith.

Curious as the inside of the synth seemed very tidy [oh, it was 
apparently owned by Benny Hill] - I did check a few other pots for 
crackles (ie. to get an idea if it could be a more general issue) but 
certainly volume and cutoff appeared to be great.

Yeah, if the issue comes back then we'll try taking them apart, cleaning 
and lubricating - but there wasn't time today.

Here's a pic - http://bugbrand.co.uk/images/MinimoogDcyPot.jpg

I've never had any time with a Minimoog before, nor opened one - lovely 
build quality!


On 07/06/2016 18:33, Keith Winstanley wrote:
> The original Allen Bradley pots were US made newer ones in Mexico. Should be a difference but I think the US ones are a bit more robust. If they are new they shouldn't have worn out so you may have cleaned the tracks by giving them a few turns. Had to replace VCO level and filter cutoff pots in a friend fairly beat up mini and originals weren't easy to find. The pots can be taken apart
>
> Keith
>
>> On 7 Jun 2016, at 13:50, Tom Bugs <admin at bugbrand.co.uk> wrote:
>>
>> Hi,
>>
>> A friend brought round a Minimoog Model D as he thought there was something wrong with the Decay (Amp Contour) - he described it as jumping suddenly from off to on.
>> This was a Mini which he'd picked up recently and had been serviced recently.
>>
>> On closer testing - the Decay appeared to have a dead-spot around 10 o'clock where it would jump up to long decay [and, actually, the times beyond 1s seemed overly long].
>> I also then checked the Filter Contour Decay - and this seemed to have a dead-spot but more like 8 o'clock.
>>
>> Having a quick look inside (time limits) things looked very clean so I wondered if people can comment on whether it sounds like the pots have all been changed on the unit.
>> The ones here looked brand new - AB type J-type (1M) -- do you think these'd be originals?
>>
>> I didn't have suitable cleaner (and no time/desire to disassemble) so.. tested a bit with a multimeter and did seem to find the dead-spots.
>>
>> But then on reassembly both controls seemed to work well! So.. anyone had similar experiences?
>> The apparent dead-spot behaviour made me think it was pot problem rather than interconnect issues. Perhaps it was just dirt which was dislodged by many turnings.
>> Still curious as to whether these pots would be originals or replacements.
>>
>> Any ideas or comments?
>>
>> Ta! Tom
>>
>>
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BugBrand LTD
UK company No. 07199808
VAT No. GB 988 2629 57
1 Ninetree Hill
BRISTOL BS1 3SB
United Kingdom
www.bugbrand.co.uk