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K250-2 bass pot value? [message #16054]

Sun, 11 September 2011 12:26

Explorer's Club
Messages: 9
Registered: March 2011

Junior Member

Anyone know what the bass pot value is for a k250-2? Don't know if I makes a diff but it is the top channel with the selector knob.

Also where can one purchase a replacement?

Somewhat off topic - this amp is MUCH quieter than my k200b pa head. No background hiss and overall it just sounds a lot better. Is this due it being a later model? Diff between guitar and pa head? Should I get the pa head serviced?

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Re: K250-2 bass pot value? [message #16057 is a reply to message #16054]

Mon, 12 September 2011 07:43

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

I will get back to you tonight on those questions if no one else here on the board has done so.

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Re: K250-2 bass pot value? [message #16058 is a reply to message #16057]

Mon, 12 September 2011 07:54

Explorer's Club
Messages: 9
Registered: March 2011

Junior Member

Thanks! Kind of stuck till I find out.

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Re: K250-2 bass pot value? [message #16059 is a reply to message #16054]

Mon, 12 September 2011 12:23

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

The bass pot on the Selectone preamp board (PC5067) is 100K. The bass pot on the normal preamp board (PC5066) is 50K.

They are CTS brand PC mount pots. The service book does not list the taper. You may be able to order one from Antique Electronics, they used to have a bunch of NOS Kustom pots.

What is wrong with the one you have?

As for the background hiss, there can be a million reasons that the PA head is noisier, one of which is that there are 4 preamp channels all feeding into the output versus 2 channels on the 250 head. If you can, compare your K200B PA head with another one and see how it sounds.

As for the overall sound, the metal front amps were completely redesigned with updated preamps and effects sections, using ic chips. Only the power amps remained similar to the older B-series amps. So the tone and features will be quite different.

[Updated on: Mon, 12 September 2011 12:23]

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Re: K250-2 bass pot value? [message #16162 is a reply to message #16059]

Mon, 03 October 2011 20:43

Explorer's Club
Messages: 9
Registered: March 2011

Junior Member

So I replaced the selectone bass pot with a 100k. The original I broke trying to take it off to clean it.

The new pot works, but I'm questioning whether the value is correct, as it makes the bass really boomy and adds noise to the signal when it anything but off. Is 100 indeed the right value?

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Re: K250-2 bass pot value? [message #16165 is a reply to message #16054]

Tue, 04 October 2011 07:23

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

The needed value is 100k or 100,000 ohms not 100 ohms if thats what you used.

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Re: K250-2 bass pot value? [message #16172 is a reply to message #16054]

Tue, 04 October 2011 17:47

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

I just double checked, PC5067 which is the Selectone preamp for your amp uses a 100K pot for the bass control. If you still have the original one, you can read its' resistance value and taper to compare the replacement one.

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