Potentiometers for Fender Stage Lead II 212?

[Enzo]

If you look at the parts list, there are two kinds of knobs, the regular, and the 180. 180 meaning they are 180 degrees different from regular. That is why some knobs point exactly opposite how they should.

[Axtman]

Unfortunately the only knobs I could find are these "right side up"knobs.

https://www.tubesandmore.com/products/P-K319

[Enzo]

yes, and I don't think even Fender has any of the reverse knobs any longer as well.

[oc disorder]

While we're on the subject here's a list of reverse audio pots at "Tubes and More" March 2016

Reverse Audio (Log.) Potentiometers TubesandMore

https://www.tubesandmore.com/products/potentiometers_0

R-VSN-25KC-SS - 16mm, Snap-In, with Bracket, 25K Reverse Audio, Solid Shaft

R-VSN-100KC-DS -16mm, Snap-In, with Bracket, 100K Reverse Audio, D Shaft

R-VSN-50KC-DS - 16mm, Snap-In, with Bracket, 50K Reverse Audio, D Shaft

R-VSN-250KC-DS -16mm, Snap-In, with Bracket, 250K Reverse Audio, D Shaft

R-VSN-50KC-SS - 16mm, Snap-In, with Bracket, 50K Reverse Audio, Solid Shaft

R-VSN-3MC-SS - 16mm, Snap-In, with Bracket, 3M Reverse Audio, Solid Shaft


R-V38-250K-RA Alpha, 250K, Reverse Audio, ⅜" Bushing

R-VC3M-RA CTS, 3M Reverse Audio 24mm

R-VC50K-RA CTS, 50K Reverse Audio 24mm

R-V38-50K-RA Alpha 50K reverse audio, ⅜" bushing

R-V50KRA-SP 50K Stereo Potentiometer - 3/16" Bushing, PC Mount Spider

[Stampede]

Hey Axtman, thanks for this thread. I'm also fixing up a Stagelead 212. It is a great little amp, though mine too came in rough shape.
Were you able to find any good schematics to work from? Also if it's not too much trouble could you list what the values of the pots you purchased as replacements are? I'm having a weird issue with the sound only working after the volume gets cranked so I'm going to start by replacing all my pots. Couldn't hurt either after how dirty the entire amp has been.

[52 Bill]

Welcome to the place.

...so I'm going to start by replacing all my pots. Couldn't hurt either after how dirty the entire amp has been.

Please, please, please don't do this! If they need to be replaced, then replace them. If you think that this might fix your amp, you're wasting both time and money.

Please start a new thread for your amp and we'll all help you find the schematic, and the problem.

[Stampede]

Hey 52 Bill, I appreciate the advice. I'm not looking to senselessly fiddle, but I have been doing a lot of testing and research on this amp. I do have a schematic from Fender but I wonder what some of the notation is. Like some of the pots are labeled 50ka and others 50kl or 50kra. Is this signifying linear vs ..?
I am going to do some signal tracing this weekend and if I still can't isolate the problem I will definitely post a new repair thread.

This is what I found for potentiometer values:
180 deg - Channel 1
Volume - R102 - 50KA
Treble - R105 - 50KL
Middle - R107 - 2KA
Bass - R106 - 50KL

Regular - Channel 2
Volume - R6 - 50KA
Gain - R23 - 10KRA
Master - R37 - 50KL
Treble - R18 - 50KRA
Middle - R15 - 50KL
Bass - R12 - 50KRA
Reverb - R55 - 50KL

Can anyone confirm these values?

[52 Bill]

In this case the L stands for linear taper, the A stands for audio taper and the RA stands for reverse audio taper.

[Stampede]

Ah, thanks Bill.

[52 Bill]

Exactly what amp do you have? My schematic shows entirely different controls and values. Two channels, one with VTMB and the other with gain, volume, bass, lo/mid, hi/mid, treble and master. With presence and reverb as well.

[Stampede]

Yea, from what i found there is a lot of discrepancy with the schematics for this amp because it often gets lumped in with the studio lead and various 1x10 and 2x12 amps with similar schematics. It definitely took me a little while, and even multiple requests to Fender, to find one that was actually similar to my amp. Here is the one I used, https://www.dropbox.com/s/5e7d8cm35r...0Lead.pdf?dl=0

The amp as it is written on the front is a Fender StageLead 212.
I don't have the presence knob or the hi/lol mids, I have VTMB for channel one and channel two with Volume Gain Master, Treble Middle Bass Reverb.

[Steve A.]

Yea, from what i found there is a lot of discrepancy with the schematics for this amp because it often gets lumped in with the studio lead and various 1x10 and 2x12 amps with similar schematics. It definitely took me a little while, and even multiple requests to Fender, to find one that was actually similar to my amp. Here is the one I used,
https://www.dropbox.com/s/5e7d8cm35r...0Lead.pdf?dl=0

Perhaps it is just me but I could not open PDF file. Can you attach the file to a post here? (I have had problems here with my own links to Dropbox files.)

Thanks!

Steve Ahola

P.S. Instructions for attaching files here:

http://music-electronics-forum.com/t41874/

[Stampede]

Hey Steve, sure here's the schematic.

Stage Lead.pdf

Thanks for the tutorial link

[DrGonz78]

Hey Steve, sure here's the schematic.

Yeah that looks like the user manual for the amp and not a schematic. Here is a great website dedicated to these amps.
schematics for Fender "II" series Rivera-era solid-state amps

Also, a while back I had a Stage Lead II amp that was the Japanese version and not the made in the USA. The schematics are different so I emailed the web master for that site I linked above. Amazingly in about an hour or so he responded and sent me a copy of that version too. That gentleman that made that site is crazy for that era of Rivera designed Fender amps. Also, I really like the sound of the Showman solid state amps in that era.

[Axtman]

Stampede,

Here is what the different designations mean. Make sure that you replace the pots with the exact value and taper.

50KA = 50,000 ohms audio taper
50KL = 50,000 ohms linear taper
50KRA = 50,000 ohms revers audio taper

I don't remember which potentiometers that I replaced, but I did replace many. I replaced all the pots that did not turn well after cleaning or broken, shafts bent, shafts broken, etc. I think the amp took a face plant.

Like 52 Bill, I would not recommend fixing something that is not broken.

Good luck.