‘72 Fender The Twin (red knob) parts source?

[JGale]

It’s got a circuit board (grrr). 
I need four potentiometers, the first four on the first channel, one of them switched. Also a jack, all for PCB mount. 
 

What fun we will have. 💩

[crunchee]

Never mind, Dave Scepter's answer is better than mine.

[Dave Scepter]

https://www.tubesandmore.com/

[velorush]

'72 with a PCB?  (Interesting) news to me.  I've been in more than a few in the silver-faced era and all I've seen were turret board.  I thought PCB started in the mid-eighties.

[JGale]

It’s a red knob “The Twin”. Did I read the serial number wrong…again?😱

[Tortious]

Red-knobs were like 86-89-ish, and it continued with black knobs until about 93. The pots/jacks directly to the boards have always been a bit problematic, but they are great amps (so I think), and usually can still be found quite cheap.

 

Edit - the serial numbers are kinda useless for dating. There's usually a date code, like a 2 letter thing or similar, on the tube chart or some sticker on the inside.

[HSB0531]

On 3/1/2024 at 4:14 PM, JGale said:

It’s got a circuit board (grrr). 
I need four potentiometers, the first four on the first channel, one of them switched. Also a jack, all for PCB mount. 
 

What fun we will have. 💩

For me, the hardest part of working on older gear, is finding parts.  Caps are especially difficult because the sizes are much smaller than they were for a given voltage and capacitance.  IC's are harder to find in socket mount packaging too.  Resisters are still easy to source though. Pots are a little tricky because of the mounting style, shaft type, and whether they are linear taper or Logarithmic.

Here's some info on types of pots and markings used:  https://eepower.com/resistor-guide/resistor-types/potentiometer-taper/#

The pots on the circuit board are usually linear taper, but a few amp designs have required audio (log) taper.

[Dutchman]

That's not a 72. Sorry. 

I used amplified parts for most parts. I'm sure it's just a spin off of some larger sales store.  The PCP stuff is relatively easy to fix. But it does require exaxct fit. Pull one out and should have a part number. Then possibly Mouser might have the part in inventory yet. 

I had to replace all the pots on a 90's Peavey bass amp a while ago and sourced them out of mouser.

Good luck!!

[HSB0531]

16 hours ago, Dutchman said:

That's not a 72. Sorry. 

I used amplified parts for most parts. I'm sure it's just a spin off of some larger sales store.  The PCP stuff is relatively easy to fix. But it does require exaxct fit. Pull one out and should have a part number. Then possibly Mouser might have the part in inventory yet. 

I had to replace all the pots on a 90's Peavey bass amp a while ago and sourced them out of mouser.

Good luck!!

I use Mouser also.

They seem to have the most inventory and the widest range.

One item that's been an indispensable tool, is my digital caliper.  I use it to measure small parts to figure out what fits and what doesn't.

 

[JGale]

So, I can find the stereo input jack (J1 on the schematic) but the pots are proving troublesome. The existing has flat D shafts which are a no go everywhere I’ve looked so far. I can find their round shaft equivalents, even with PCB mounting.

Can D shaft knobs (like the ones on the infamous Red Twin) be drilled out for a round shaft?

[Dutchman]

https://www.ebay.com/itm/374853470781?chn=ps&norover=1&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&mkscid=101&itemid=374853470781&targetid=1529493983942&device=m&mktype=pla&googleloc=9020386&poi=&campaignid=19851828444&mkgroupid=145880009014&rlsatarget=aud-1306613350219:pla-1529493983942&abcId=9307249&merchantid=6351864&gad_source=1&gclid=CjwKCAiA6KWvBhAREiwAFPZM7o2Neb5B0aUlER1LS7kmZ7QpFpfIzwOVc9mpky2JshirB9cZvrPLfxoCcrIQAvD_BwE

 

Angela has always been good to work with for me. Kinda pricey... but... you know....

[Dutchman]

Here's one I have not used. See if any of these look right.

https://images.app.goo.gl/BstxHYh255txyHX39

[JGale]

Yay! 👍✌️😎

I found all four components I need at Tube Amp Doctor..in Germany.

Made to fit Fender The Twin!

tubeampdoctor.com