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Re: Kustom 150 Repair Question [message #18228 is a reply to message #18155]

Mon, 18 February 2013 15:38

pennalizer
Messages: 37
Registered: February 2013
Location: New Jersey

Member

I checked R26 & R28 and they read .5 ohms. Not open. All diodes are good except CR4 which is FD111. So I guess I will need one of those as well.

I'm wondering if there is a heat sink for Q5 & Q6 or will I have to make one?

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Re: Kustom 150 Repair Question [message #18229 is a reply to message #18155]

Mon, 18 February 2013 15:43

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

Any silicon diode will replace CR4 like a 1N4001 or even a 1N914.

I think the NTE transistors come in TO-5 or TO-39 cases. You can order press on heatsinks from Mouser as well.

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Re: Kustom 150 Repair Question [message #18230 is a reply to message #18155]

Mon, 18 February 2013 15:47

pennalizer
Messages: 37
Registered: February 2013
Location: New Jersey

Member

Thanks! I guess a 1N4007 will work then. I have some of those. CR4 does look like a little glass zener however. 1N4007 ok?

I will check on the heat sinks and get a parts order together. This amp might live after all.!!

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Re: Kustom 150 Repair Question [message #18237 is a reply to message #18155]

Mon, 18 February 2013 19:41

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

The 1N4007 should work fine.

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Re: Kustom 150 Repair Question [message #18239 is a reply to message #18155]

Mon, 18 February 2013 19:45

pennalizer
Messages: 37
Registered: February 2013
Location: New Jersey

Member

That's what I figured. It is rated for higher voltage & current so couldn't hurt. Parts are ordered and I will post after I install the replacement parts. Hopefully with all the help here it will come back to life. Pumped!

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Re: Kustom 150 Repair Question [message #18241 is a reply to message #18155]

Tue, 19 February 2013 09:54

stevem
Messages: 4747
Registered: June 2004
Location: NY

Senior Member

The best silp on type heat sinks for the metal cased driver transistors are kind of C shaped verticle ones as the take up little extra horizontal room and do the job well.
If you need to replace a emitter resistor install the new one with leads long enough to keep the resistor away from the driver transistor near it as these can put heat in to them.

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Re: Kustom 150 Repair Question [message #18270 is a reply to message #18155]

Mon, 25 February 2013 11:38

pennalizer
Messages: 37
Registered: February 2013
Location: New Jersey

Member

Well gentlemen.... the Kustom 150 amp is alive! Everything works except that the Tremolo/Vibrato is making a thumping noise. The minute you click the Intensity pot on it starts thumping away. The thumping does not increase or decrease with the Intensity pot. I wouldn't think this is normal. Is there a fix for this? Thank you in advance!

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Re: Kustom 150 Repair Question [message #18271 is a reply to message #18155]

Mon, 25 February 2013 15:05

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

Good to hear that it's working again. What is the board number for the preamp?

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Re: Kustom 150 Repair Question [message #18272 is a reply to message #18155]

Mon, 25 February 2013 15:21

pennalizer
Messages: 37
Registered: February 2013
Location: New Jersey

Member

Thanks. Looks like PC1500 to me.

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Re: Kustom 150 Repair Question [message #18274 is a reply to message #18155]

Mon, 25 February 2013 22:26

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

I'll look to see if I have that schematic. Does the pulsing change in time with the speed control? Does it change when you turn the trem vibrato knob?

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Re: Kustom 150 Repair Question [message #18278 is a reply to message #18155]

Tue, 26 February 2013 07:29

pennalizer
Messages: 37
Registered: February 2013
Location: New Jersey

Member

The pulsing does change time with the speed control. The depth of the pulsing does not change with the intensity control however. Once you click the tremolo effect on the pulsing starts.

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Re: Kustom 150 Repair Question [message #18288 is a reply to message #18155]

Wed, 27 February 2013 08:28

pennalizer
Messages: 37
Registered: February 2013
Location: New Jersey

Member

I am going to start a new thread for this tremolo issue. Thank you for all your help on this!!!

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