Clarification on schematic

[nosaj]

I'm working on a westbury model 550 and the pushpull vol switch is broken the push pull part.

Looking at the schematic I am pretty sure it is a A1meg I will measure the actual part , just want to be sure of my reading the schematic.

Thanks,
Jason

[The Dude]

Looks right to me.

[nosaj]

Looks right to me.

Ok now the hard part I'd like to replace it with a similar sized one if possible. It's a 1MA push/pull That solders onto the PCB. I'm seeing 7mm and 16mm sizes What is this referencing?

Thanks,
JAson

[Enzo]

Diameter. 16mm is the round kind like Marshall used for years. 24mm is the "full sized" type like Fender used for years. 7mm is a tiny pot, slightly over 1/4", would be a trimmer. 16mm is a super common size.

[nosaj]

Diameter. 16mm is the round kind like Marshall used for years. 24mm is the "full sized" type like Fender used for years. 7mm is a tiny pot, slightly over 1/4", would be a trimmer. 16mm is a super common size.

ok so where might I find a 24mm A1M pushpull pot?
It looks like this one but this one is 16mm http://www.retroamplis.com/Alpha-16mm-Push-Pull-PCB/en

Thanks,
Jason

[nosaj]

ok so where might I find a 24mm A1M pushpull pot?
It looks like this one but this one is 16mm http://www.retroamplis.com/Alpha-16mm-Push-Pull-PCB/en

Thanks,
Jason

I think I have a broken 16mm one. I'm gonna try a dry fit on it and see how it fits.

nosaj

[The Dude]

Here's one, but it doesn't have lugs for soldering directly into a PCB. Maybe a little trimming will get you there, or add some wires.

[Link Removed- Wrong part]

[nosaj]

Here's one, but it doesn't have lugs for soldering directly into a PCB. Maybe a little trimming will get you there, or add some wires.

https://www.tubedepot.com/products/a...ot-with-switch

Looking at the schematic I'd think spst but looking at the pot I'd think dpdt. I'll need to look at the pcb and the old pot again tomorrow.

nosaj

[The Dude]

I only see the switch for the bright cap, but maybe there's something else?

[The Dude]

Oops! I think that switch I linked is NOT a push pull. More likely a turn type- as in power/volume. It won't work for your application. Sorry for the goose chase! I edited the post so somebody isn't steered the wrong way in the future.

[nosaj]

Oops! I think that switch I linked is NOT a push pull. More likely a turn type- as in power/volume. It won't work for your application. Sorry for the goose chase! I edited the post so somebody isn't steered the wrong way in the future.

Ok here's why we have junk boxes. I took a switch off the back end of a 16mm and popped it onto the 24mm. Problem solved. Sure was difficult. I had to actually take switch apart because the legs were not long as the originals. They are not fun to put back together.

nosaj