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K200-B2 Tremolo Problem [message #29715]

Thu, 26 March 2026 22:42

Al013213
Messages: 1
Registered: March 2026

Junior Member

Hey all, I unfortunately had to snap the shaft off the tremolo intensity on/off pot to get the PCB out for repair, the set screw on the knob absolutely would not come loose. I found a good match with a CTS pot, a 10k linear with SPST switch, but after installing, the tremolo no longer works. It was already weak, which is why I was opening it up in the first place. The old pot is still good, I'm going to cut a slot in the remaining shaft so I can turn it with a screwdriver at least. I'm wondering if its not a linear pot in that position? Or my LFO is dead? I don't see how the pot could possibly be wired wrong, it's got the same lugs and orientation. I could try putting the wiper/shaft from the new pot in to the old pot.

And while we're at it, any tips for bringing the tremolo back to life? The amp is in very good cosmetic and internal condition.

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Re: K200-B2 Tremolo Problem [message #29716 is a reply to message #29715]

Fri, 27 March 2026 04:44

stevem
Messages: 4902
Registered: June 2004
Location: NY

Senior Member

I see no notes on the schematic saying that the Int pot is anything special.

The first thing I would do is replace all the electrolytic caps on that 303 board.

There are 2 33 uf caps.
9 10uf caps.
3 1uf caps.

All should have at least a 35 volt rating in terms of replacements.

Be sure to install the new ones with the right polarity, so note each old when you remove them and only replace one at a time.

Note that there are 4 revisions of this board schematic wise, so check what your board says on it.

I would also confirm that the two diodes in the tremolo circuit are not shorted or open.

Also note that some boards need to be bolted to the chassis to complete circuit ground connections.

Look at where the pots come thru the face of the board and you will see if a pot shaft needs to be grounded.

For now you could mimic a good pot being there with a 10k resistor and a short on the board.

[Updated on: Fri, 27 March 2026 04:51]

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