Old Crate amp pot : G40XL

[greekdude]

Hello, this is the pot in the center labelled : 70-254-22 137/9015 ROC

2020-01-03_05-42-31 by panixgr, on Flickr

any one knows where to source this? or anything equivalent?

 

[ehdwuld]

Re: Old Crate amp pot : G40XL

http://www.loudtechnologies.eu/ampeg/en/older-ampeg-parts/70-254-22/a-4468-29

 

[greekdude]

Re: Old Crate amp pot : G40XL

Thanks, I had seen that, the shipping cost is 37 EUR from Belgium to Greece. I think I may just start looking for alternatives, if any. Or just buy a new amp.

 

[JamesPaul]

Re: Old Crate amp pot : G40XL

That is the usual problem when buying any single part. I try and save up repair projects so I can order enough parts that the shipping cost appears reasonable.

It depends on space available around the pot, but an alternative is to remove the old pot from the board. Solder 3 wires to the board/pads where the old pot mounted.

Find a cost effective place to buy the equivalent pot with slightly longer shaft threads. Then you put a lock washer on the pot. Mount the new pot in the face plate with the legs 90 degrees or 180 degrees away from the board. Put a lock washer and the old nut on the front of the face plate. You usually need the lock washers to ensure the pot does not rotate when you turn the knob.

Then solder the other end of the wires to the pot legs. You want the wires to be as short as possible and depending on the circuit this can still induce some noise. There may also be some cosmetic differences where that knob is farther from the face plate than the others.

 

[greekdude]

Re: Old Crate amp pot : G40XL

^^^ thanx, I'll concentrate on the shaft and find similar diameter and shape (split), then all the rest are doable as you say!

 

[JamesPaul]

Re: Old Crate amp pot : G40XL

Now that you know it is a 250k audio taper, if you have a local or online electronics supplier in Greece you may be able to find an equivalent that could still be soldered to the board. It might require slightly bending the legs or the shaft might be a little longer, but any 250k audio taper potentiometer that fits will work. It does not have to be that exact part.

I am not sure why, but I was assuming those options had been exhausted.

 

[greekdude]

Re: Old Crate amp pot : G40XL

^^^ its hard to find this shaft dimensions. Anyways of course this is doable, I'd like it to not look ugly that's all.

 

[greekdude]

Re: Old Crate amp pot : G40XL

hey, I think this is getting closer : https://www.soundtronics.co.uk/synth-pot-16mm-250k-log.html

 

[greekdude]

Re: Old Crate amp pot : G40XL

Hi, ended up ordering this : https://www.ebay.co.uk/itm/Taiwan-A...var=452812941432&_trksid=p2057872.m2749.l2649
I hope the shaft's diameter wont be too large for the knob.

 

[greekdude]

Re: Old Crate amp pot : G40XL

Original knob didnt fit. Had to buy one which looks close but still far from the original. Will post photos soon. Luckily the scratchy noises are now gone!

 

[greekdude]

Re: Old Crate amp pot : G40XL

2020-01-24_11-52-32 by panixgr, on Flickr

2020-01-24_11-53-28 by panixgr, on Flickr

2020-01-24_11-53-41 by panixgr, on Flickr

 

[ehdwuld]

Re: Old Crate amp pot : G40XL

close enough