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New Pots for K150-8 [message #20605] Tue, 13 May 2014 09:50 Go to next message
oxxe is currently offline  oxxe
Messages: 1
Registered: May 2014
Location: Germany
Junior Member
Hey there, I'm new here, so HELLO to everybody!

I've found a Kustum K150-8 in my grandpas house.
Now i decidet to refurbish this thing.
Almost all pots are scratching and I thougt i would easyly replace them.
Now I'm searcing for these CTS Pots with long windings.
Does anyone have a clue where i can order those?

Many thanks in advance!!

By the way two more questions:
The serial nummer is : 77496
When was the amp build?

The four speakers were all put parallel together.
It looks a kind of selfmade Smile
To which impedance is the amp stable?

Re: New Pots for K150-8 [message #20606 is a reply to message #20605] Tue, 13 May 2014 11:13 Go to previous messageGo to next message
pleat is currently offline  pleat
Messages: 1452
Registered: June 2004
Location: Belding, Mi
Senior Member
First off, Welcome to the site.
I would try cleaning the controls with a control spray cleaner. I'm not sure the pots are ava. other than from a donor amp. One of the tech guys may have a better answer if the pots can still be purchased and where.

From the serial number, it should be between July - December 1971.

The speakers are 8 ohms if original and would be wired in series/parallel for a 8 ohm total load to the amp.
What color is your amp?

pleat
Re: New Pots for K150-8 [message #20607 is a reply to message #20605] Tue, 13 May 2014 12:38 Go to previous messageGo to next message
chicagobill
Messages: 2005
Registered: April 2003
Senior Member
Willkommen! Your English is much better than my German, so I won't try anything more in German here.

You are lucky that your grandfather had a great amp for you to find. The original pots were custom manufactured and will not be available to purchase through any regular supply sources.

Pleat is right in suggesting that you clean the pots with a good quality control cleaner. I use a product made by Caig called DeoxIT. I don't know if you can find it where you are located, but it does a great job of cleaning and lubricating old noisy pots.

And yes, tell us what color it is and post a photo if you can.
Re: New Pots for K150-8 [message #20608 is a reply to message #20605] Tue, 13 May 2014 13:08 Go to previous messageGo to next message
stevem is currently offline  stevem
Messages: 4728
Registered: June 2004
Location: NY
Senior Member
Since all the boards in these amps unplug I would do so to remove them from the amp an then if you have soldering skills I would then unsolder the pots one at a time from the board, spray them out and then solder them back in.
Sometimes what I do on boards that the pots can be a big time project to unsolder out, I will drill a hole in the board on top of the pot that is big enough in size to let the spray nozzle get into the slot area of the pot.
If you do this you must be sure that 1, you are not drilling into any other circuit part or board trace and 2, when drilling you must hold the board in a way to not let any drill shavings get down into the pot.

[Updated on: Tue, 13 May 2014 13:09]

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Re: New Pots for K150-8 [message #20610 is a reply to message #20608] Tue, 13 May 2014 20:52 Go to previous messageGo to next message
pleat is currently offline  pleat
Messages: 1452
Registered: June 2004
Location: Belding, Mi
Senior Member
The amp is a K150-8 Self contained 4x10 so the pots can be sprayed cleaned without removing the pots or drilling holes in the circuit boards, but that is a great idea on the K150 and K250 slant metal face amps.

pleat
Re: New Pots for K150-8 [message #20611 is a reply to message #20605] Wed, 14 May 2014 06:08 Go to previous message
stevem is currently offline  stevem
Messages: 4728
Registered: June 2004
Location: NY
Senior Member
Ah, sorry I messed the -8 part!
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