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Question: Checking voltages on Challenger [message #6434]

Sun, 18 December 2005 10:04

buddy
Messages: 1
Registered: December 2005
Location: midwest

Junior Member

Hi, I'm repairing a friend's Kustom Challenger amp... other than the tremolo not working, the amp sounds fine. The trem circuit isn't optical, it looks like it uses an 8-pin N5558V op amp chip.

The schematic states, "Voltages are with power on, all controls full on, no signal, and no load". I've repaired a number of tube-type amps, but don't have much experience with solid state. Is it OK to have the speaker (load) disconnected when the circuit is energized?

I read the post that says don't do this on a circuit with only one output transistor, but the Challenger has two. Thanks for any advice on what to look for to fix the tremolo. Buddy

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Re: Question: Checking voltages on Challenger [message #6435 is a reply to message #6434]

Mon, 19 December 2005 07:54

stevem
Messages: 4745
Registered: June 2004
Location: NY

Senior Member

Yes its ok, unlike a tube amp that needs a load on the secondary to properly transfer a load onto the output tube plates hooked to the primary of the output transformer, a SS push pull amp like the kustom can not draw enough current thru its outputs to harm its self with no load.If you ever work on a SS amp with just one output transistor you need to have a load on that or youwill pop the output transistor.

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Re: Question: Checking voltages on Challenger [message #6571 is a reply to message #6434]

Thu, 19 January 2006 22:33

kustomise
Messages: 37
Registered: January 2005
Location: Redding California

Member

Does this apply to a Kustom 200 for instance? I'm asking about Steven's responce. Do all vintage SS Kustoms have more than 1 output transistor?-kustomise

Kustom Rules!

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Re: Question: Checking voltages on Challenger [message #6572 is a reply to message #6434]

Fri, 20 January 2006 08:28

stevem
Messages: 4745
Registered: June 2004
Location: NY

Senior Member

Hi, all kustoms are push pull outputs, So yes its OK to run them with no speaker load and cranked up to 10.

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