K250-1 Knob Removal [message #20340] |
Mon, 17 March 2014 22:37 |
retroamped
Messages: 4 Registered: March 2014 Location: Fort Payne, Alabama
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Junior Member |
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I'm going to be mixing-and-matching two K250s with issues to get one really good one. I'm embarrassed to admit I can't get the knobs off. I assumed they are push-on on a d-shaft. I don't see any set screws. I tugged pretty hard and can't get any to budge. I'm afraid to pry 'em for fear of breaking something original. Can I get some advice?
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Re: K250-1 Knob Removal [message #20341 is a reply to message #20340] |
Tue, 18 March 2014 00:49 |
chicagobill
Messages: 2006 Registered: April 2003
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Senior Member |
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Yes, they should be D shaft push on with no set screws. I've seen them get stuck on so hard that if you try and pry them up, you will crack the knob or pull the shaft out of the pot.
I think that the problem is the spring metal insert that is inside the knob rusts or corrodes itself to the pot shaft.
Set the amp face down and then spray a little WD-40 under the knob so that it can seep down into the knob/shaft area. Let it sit for a little while and then try to pull the knob off.
If you do break one, you can replace them with the set screw type that is carried at Small Bear Electronics. They are an exact match to the originals, with the exception of the set screws.
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Re: K250-1 Knob Removal [message #20342 is a reply to message #20340] |
Tue, 18 March 2014 06:58 |
stevem
Messages: 4772 Registered: June 2004 Location: NY
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Senior Member |
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I have had the same issue.At times I have had to pry the center round aluminum trim off of the knob and drill a hole in the center( yes this wastes the knob(s) and then spray PB blaster down the shaft.
PB blaster is the untimate rust breaker on the planet and most auto parts stores stock it, if you work on your car or lawn stuff you need to have it on hand anyway!
NOTE, that if the knob is that badly rusted or stuck on the pot shaft that if you are removing the knobs to get that circuit board off the front of the amp than the pots retension nut may be even more of a pain to get off!
Many times I have had to cut across the nut with a small cut off disc in a Dreamel tool.
Take your time and if you get frustrated, take a break and come back latter!
What is the issue with the donor K250?
[Updated on: Tue, 18 March 2014 07:04] Report message to a moderator
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