Old style trim pots

Stuey · 2nd August 2008, 09:59 AM

Hi,

I'm refurbishing a 70's Onkyo tuner in which there are a number of those large style trimpots, with a footprint of about 10 mm x 12 mm (pure guess on these dimensions).

What do people use now to replace these? Or are they still available?

Cheers

Stuey

Stuey · 2nd August 2008, 11:35 AM

I just re-read this and realised I'd been a bit vague. They are the horizontal type, open, with phenolic insulator and open metal wiper. The classic cheapo trimpot. But they're quite big.

I'm wondering if in repair, people are using a different type. I'm not sure of their power rating.

Cheers

Stuey

Mooly · 3rd August 2008, 10:49 AM

I know the one's you mean. Very common in 70's gear. Are they dickey (loose rivets etc) or were you just after changing them to be sure. Worth taking them out and soaking in WD40 and keep spinning them round a few times. Other than that you will have to search the catalogues I'm afraid.
It's nice to do a good job though

Stuey · 3rd August 2008, 11:00 AM

Hi Mooly,

Yeah, one's knackered. It's a 50K one and has a range of 1K to 2.5K or so (used as a variable resistor). I actually just realised today that they're even bigger than my estimates above.

I may just replace the broken one with a single turn cermet (sealed type).

Cheers

Stuey

Mooly · 3rd August 2008, 11:41 AM

If it's duff there's no option really, it's just nice to keep things original. Is there enough "print and space between print" underneath so you could redrill new holes for new pots.

Stuey · 3rd August 2008, 11:54 AM

Sorry, I'm not sure I know what you mean... ?

Cheers

Stu

Mooly · 3rd August 2008, 01:32 PM

Could you re-drill new holes in the PCB to take new smaller pots so they fit properly and still solder to the original pads.

dnsey · 3rd August 2008, 01:40 PM

Not quite whatyou're lookong for, I know, but would these be any good?

2nd August 2008, 09:59 AM	#1
Stuey diyAudio Member Join Date: Mar 2006 Location: Perth, Western Australia	Old style trim pots Hi, I'm refurbishing a 70's Onkyo tuner in which there are a number of those large style trimpots, with a footprint of about 10 mm x 12 mm (pure guess on these dimensions). What do people use now to replace these? Or are they still available? Cheers Stuey

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2nd August 2008, 11:35 AM	#2
Stuey diyAudio Member Join Date: Mar 2006 Location: Perth, Western Australia	I just re-read this and realised I'd been a bit vague. They are the horizontal type, open, with phenolic insulator and open metal wiper. The classic cheapo trimpot. But they're quite big. I'm wondering if in repair, people are using a different type. I'm not sure of their power rating. Cheers Stuey

3rd August 2008, 10:49 AM	#3
Mooly diyAudio Moderator Join Date: Sep 2007	I know the one's you mean. Very common in 70's gear. Are they dickey (loose rivets etc) or were you just after changing them to be sure. Worth taking them out and soaking in WD40 and keep spinning them round a few times. Other than that you will have to search the catalogues I'm afraid. It's nice to do a good job though

3rd August 2008, 11:00 AM	#4
Stuey diyAudio Member Join Date: Mar 2006 Location: Perth, Western Australia	Hi Mooly, Yeah, one's knackered. It's a 50K one and has a range of 1K to 2.5K or so (used as a variable resistor). I actually just realised today that they're even bigger than my estimates above. I may just replace the broken one with a single turn cermet (sealed type). Cheers Stuey

3rd August 2008, 11:41 AM	#5
Mooly diyAudio Moderator Join Date: Sep 2007	If it's duff there's no option really, it's just nice to keep things original. Is there enough "print and space between print" underneath so you could redrill new holes for new pots.

3rd August 2008, 11:54 AM	#6
Stuey diyAudio Member Join Date: Mar 2006 Location: Perth, Western Australia	Sorry, I'm not sure I know what you mean... ? Cheers Stu

3rd August 2008, 01:40 PM	#8
dnsey diyAudio Member Join Date: Mar 2004 Location: Shropshire, England	Not quite whatyou're lookong for, I know, but would these be any good?