Home » VintageKustom.com » Repairing Kustom Amps » Question: Checking voltages on Challenger

Show: Today's Messages :: Show Polls :: Message Navigator

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 Report message to a moderator

Re: Question: Checking voltages on Challenger [message #6435 is a reply to message #6434] Mon, 19 December 2005 07:54   stevem Messages: 4733 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. Report message to a moderator

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! Report message to a moderator

Re: Question: Checking voltages on Challenger [message #6572 is a reply to message #6434] Fri, 20 January 2006 08:28   stevem Messages: 4733 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. Report message to a moderator

Previous Topic:	challenger hum
Next Topic:	PC402A and 402B/ clipper/ boost

Goto Forum:

- VintageKustom.com  Comment Board  Replacement Part Suggestions  Repairing Kustom Amps- Classified Ads  For Sale  Wanted- FUDforum Questions & Problems  Questions & Problems about FUDforum