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need kustom 200a-5 schematics [message #17423]

Wed, 29 August 2012 19:08

jassman
Messages: 9
Registered: August 2012
Location: montreal

Junior Member

Hello fellow Kustom fans,
I have a Kustom 200a-5 4 channel amp.I am in need of the following schematics, PC502, PC602, PC102, PC702. Can anyone let me know where I can get them...free?
Much appreciated,
Michael

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Re: need kustom 200a-5 schematics [message #17425 is a reply to message #17423]

Thu, 30 August 2012 12:20

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

Welcome to the place. PM your email address to me and I will send them to you.

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Re: need kustom 200a-5 schematics [message #17426 is a reply to message #17425]

Fri, 31 August 2012 10:58

jassman
Messages: 9
Registered: August 2012
Location: montreal

Junior Member

Thank you so much William for the k200a-5 schematics. Greatly appreciated!

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Re: need kustom 200a-5 schematics [message #17427 is a reply to message #17423]

Sat, 01 September 2012 00:27

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

No problem. To answer your question regarding the blown fuse, the two main reasons for blown fuses are shorted transistors (output and driver) and shorted power supply diodes.

If you have a multimeter with a diode test function, use it to test the output transistors. The most common failure is a short between Collector and Emitter. If you do find one or more shorted ones, test the drivers as well as the emitter resistors.

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Re: need kustom 200a-5 schematics [message #17428 is a reply to message #17427]

Sat, 01 September 2012 10:08

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

Folks need to be carefull when working on the A serise amps, as where they mount all the TO3 type (6) transistors on the bottom side of the amp can be a disaster if you are powered up and working on a metal bench top, of something like a metal tool rolls under the chassis!

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Re: need kustom 200a-5 schematics [message #17429 is a reply to message #17423]

Sat, 01 September 2012 11:58

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

When I work on them, I stand them up on end, with the power transformer at the bottom for stability.

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Re: need kustom 200a-5 schematics [message #17430 is a reply to message #17427]

Sat, 01 September 2012 13:24

jassman
Messages: 9
Registered: August 2012
Location: montreal

Junior Member

thanks William...I've replaced all 6 power /driver transistors and will check the -/+ regulator boards. Found 1 power transistor was shorting. I'll next check the 2 regulator boards. I'll post my results when done.
Regards,
Michael

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Re: need kustom 200a-5 schematics [message #17431 is a reply to message #17428]

Sat, 01 September 2012 18:45

jassman
Messages: 9
Registered: August 2012
Location: montreal

Junior Member

excellent point friend. I for one work on a wood top table
Cheers!

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Re: need kustom 200a-5 schematics [message #17433 is a reply to message #17423]

Mon, 03 September 2012 17:56

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

While you are at Michael I would take a close look at all of the white body Mallory electrolytic caps, as many time not only are they shorted, but the end caps have blown out and or crap is leaking out around the leads.
If you have a cap meter check them all!

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Re: need kustom 200a-5 schematics [message #17434 is a reply to message #17433]

Mon, 03 September 2012 19:16

jassman
Messages: 9
Registered: August 2012
Location: montreal

Junior Member

Thank you William ...I'll do just that. By the way, I just went over the entire power supply incl. both regulator boards. The only fault found was 1 power transistor was shorting so I replaced all 6 with the 3055 equivalent since the 4 power types were still the original ones c1967! The 2 drivers were replaced some time but also oldRCAs. Powered up the amp and heard hisssss & ch.1 distorted. Turns out it was a weak solder on a small se4002 transistor. Now amp sounds fine with just slight buzzzz I thing due to overall age of this beauty. The sound I got was nice n tight clean with just the right amount of overdrive! One thing though, depending how you physically handle the amp while powered up, the reverb tank emit loud booming type noise then settles down....any thought out there on some remedy ie cushioning of sort?I will next go over all parts on each of the 4 preamp boards.
Cheers William,
Michael

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Re: need kustom 200a-5 schematics [message #17436 is a reply to message #17423]

Tue, 04 September 2012 00:38

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

You have been getting advice from Steve as well as from me, so thanks go to him as well.

All reverb tanks will make noise when they are shaken up, but the springs (reverb and mounting) can get stretched out from age and vibrations. You could try a new tank to see if it makes less noise.

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Re: need kustom 200a-5 schematics [message #17437 is a reply to message #17436]

Tue, 04 September 2012 06:19

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

Also just to let you know the 4 original outputs are matched from Kustom and as such even though they are old they will give a tad more output and less distortion ( crossover type distortion) then the new ones you installed being as they are un-matched.

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