Moog Prodigy Tuning Trimpots
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HowIMadeMyMillions
- Posts: 107
- Joined: Sun Feb 08, 2004 4:21 pm
- Location: Canada
Moog Prodigy Tuning Trimpots
Hi y'all ... 'Just grabbed a prodigy to clean up and am looking to replace all of the tuning trimpots. Bummer design, and a few have been bent back and forth enough to be on their last legs. I'm assuming any ol' 10K trimpot would be fine but was wondering if anyone had recommendations on quality ones to use? Best n thanks.
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thealien666
- Posts: 2791
- Joined: Mon Nov 14, 2011 8:42 pm
- Location: Quebec, Canada
Re: Moog Prodigy Tuning Trimpots
Hi. Looking at your alias name, you'd think that you could afford an already refurbished Prodigy ? 
Kidding aside, congrats on your acquisition !
Bourns makes quality trim pots. I'm sure there are a few others also. And whenever I can, and where it's most desirable, I tend to replace the originals with multi-turn ones. Especially in critical circuits like oscillator tuning and such.
It's not always easy to align them so that they're accessible thru holes in the casing, for easy access from the outside, but there is a lot of different shapes and styles to match most situations.
But not all trim pots need this sort of precision.
And as long as the value of the replacement is the same as the original, it should do fine.
I also tend to avoid open-design (like the inexpensive type Alpha produces), because of contamination from external sources (dust, dirt, humidity).
TIFWIW.
Kidding aside, congrats on your acquisition !
Bourns makes quality trim pots. I'm sure there are a few others also. And whenever I can, and where it's most desirable, I tend to replace the originals with multi-turn ones. Especially in critical circuits like oscillator tuning and such.
It's not always easy to align them so that they're accessible thru holes in the casing, for easy access from the outside, but there is a lot of different shapes and styles to match most situations.
But not all trim pots need this sort of precision.
And as long as the value of the replacement is the same as the original, it should do fine.
I also tend to avoid open-design (like the inexpensive type Alpha produces), because of contamination from external sources (dust, dirt, humidity).
TIFWIW.
Moog Minimoog D (1975)
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DSI OB6
DSI Prophet REV2
Oberheim Matrix-6
Ensoniq SQ-80
Korg DW8000
Behringer DeepMind 12
Alesis Ion
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HowIMadeMyMillions
- Posts: 107
- Joined: Sun Feb 08, 2004 4:21 pm
- Location: Canada
Re: Moog Prodigy Tuning Trimpots
Haha, Actually a great Radiohead song and a sarcastic username 
Thanks for the hints.
I pulled the board and realized that indeed my OSC 1 Scale trimpot has a broken pin and that the OSC 2 Range trim pot had been replaced with a 20k Ohm. I'd like to swap them all for four, new, matched pots ... checkin the Bourn site now. Would multiturns be better for the 4 tuning pots?
For a quick reference, the manual's parts list for the early (pre-4160 serial) prodigy shows:
R3 (OSC 1 Freq Trim) and R23 (OSC 2 Freq Trim) - 925 042526 003 - Resistor, Trim Pot, 10k Ohm, Cermet
R7 (OSC 1 Scale Trim) and R28 (OSC 2 Scale Trim) - 925 042526 008 - Resistor, Trim Pot 500 Ohm, Cermet
Thanks for the hints.
I pulled the board and realized that indeed my OSC 1 Scale trimpot has a broken pin and that the OSC 2 Range trim pot had been replaced with a 20k Ohm. I'd like to swap them all for four, new, matched pots ... checkin the Bourn site now. Would multiturns be better for the 4 tuning pots?
For a quick reference, the manual's parts list for the early (pre-4160 serial) prodigy shows:
R3 (OSC 1 Freq Trim) and R23 (OSC 2 Freq Trim) - 925 042526 003 - Resistor, Trim Pot, 10k Ohm, Cermet
R7 (OSC 1 Scale Trim) and R28 (OSC 2 Scale Trim) - 925 042526 008 - Resistor, Trim Pot 500 Ohm, Cermet