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K250-4 Treble Pot Value [message #9126]

Wed, 09 January 2008 11:11

ellum68
Messages: 71
Registered: November 2007
Location: Sioux City, IA

Member

Just have a couple questions on the treble/bright pot on a K250-4. What value is the pot? What function is the push/pull switch (off/on, on/on)? Is it linear or audio taper. Would this work... http://cgi.ebay.com/Kustom-24mm-Pot-100k-Linear-Switched-On- Off-R-V10KL-S_W0QQitemZ130123811046QQihZ003QQcategoryZ47076Q QrdZ1QQssPageNameZWD1VQQcmdZViewItem?_trksid=p1638.m118

[Updated on: Wed, 09 January 2008 11:12]

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Re: K250-4 Treble Pot Value [message #9127 is a reply to message #9126]

Wed, 09 January 2008 12:43

stevem
Messages: 4738
Registered: June 2004
Location: NY

Senior Member

I can let you know its value in the morning, but I think its audio taper and its 1/4 inch shaft.
The switch cuts in a added cap for more briteness.

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Re: K250-4 Treble Pot Value [message #9128 is a reply to message #9127]

Wed, 09 January 2008 13:01

ellum68
Messages: 71
Registered: November 2007
Location: Sioux City, IA

Member

You're a big help! Smile

I'll be excited to hear this thing working properly.

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Re: K250-4 Treble Pot Value [message #9129 is a reply to message #9127]

Wed, 09 January 2008 13:03

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

Which channel of the 250-4 are you talking about?
What is the problem with the one you have?

The normal channel PC5066 uses a 50K pot with push/pull on/off switch. Original Kustom part number 133-0034-00.

The Selectone channel PC5067 uses a 10K pot with a push/pull on/off switch. Original Kustom part number 133-0036-00.

I don't know the specs for the taper or either pot, but my guess would be audio.

In either case the pull switch turns on and off the bright function.

The one on eBay will not work in either channel.

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Re: K250-4 Treble Pot Value [message #9130 is a reply to message #9126]

Wed, 09 January 2008 14:50

ellum68
Messages: 71
Registered: November 2007
Location: Sioux City, IA

Member

Channel two is the problem. This is really helping me get somewhere now. I think Tubes and More has what I need. http://www.tubesandmore.com/scripts/foxweb.dll/moreinfo@d:/d fs/elevclients/cemirror/ELEVATOR.FXP?item=R-V50KA-S-KU That is assuming it's audio taper. I don't have the amp here right now, but there's no way those bushings on the pots are 1/4". Unless stevem was referring to the shaft diameter, which sounds right on the money. I was thinking more like 3/8" for diameter of the threaded portion. If so, I think that pot I listed would be just the ticket.

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Re: K250-4 Treble Pot Value [message #9131 is a reply to message #9130]

Wed, 09 January 2008 16:51

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

Yes, that looks like the right pot for a PC5066 pre-amp board.
Check your board number before ordering as other boards used different values. If you have a 250-4 you should have one PC5066 and one PC5067.

Steve was talking about the shaft diameter. Most old style Kustom amps used 1/4" shaft pots, with D-shafts. The threaded bushing is 3/8" diameter.

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Re: K250-4 Treble Pot Value [message #9132 is a reply to message #9126]

Thu, 10 January 2008 06:21

stevem
Messages: 4738
Registered: June 2004
Location: NY

Senior Member

On some replacement pots with switches you are able to uncrimp the metal case from the front face of the pot and then use the original pots case on the new face, but both have to be taken apart to find out.
Un bend the 4 crimp tabs just enough to get the pot face out.

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