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Re: K200A-1 Power Amp Rescue Needed [message #27260 is a reply to message #27251]

Sun, 21 April 2019 06:06

stevem is currently offline

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

Yes, the sperate pc502 and pc602 are only used in the A serise amp, in the B series amps they where put on the pc703 board which is a combo regulator and driver board.

The A model preamps run on a + and - 23 volts and as in the later B series amps the negitive regulators output tracks the positive regulator.

This all means that the - 23 volts will never be correct if the positive regulators output is not right.
Both of these boards have 15 volt electrolytic caps that will short out if Transistors on the board are bad and thus smack the caps with way more voltage then they are rated at..

Note that if you go into our tech section and choose the pc board listing you will atleast find schematics for all the versions of your 702 board and the schematic for a 502 board which it would seem your missing!

I guess you can bread board yourself one, but first let's get the amps driver and output stage up and running.

Just for now I would unhook the 34 volt power supply wire from the regulator board that you do have .

PS, by the way there's no such thing as a vintage era Kustom bass head, they where just non effects heads and had a normal and brite channel.

[Updated on: Sun, 21 April 2019 06:25]

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[Message index]

		K200A-1 Power Amp Rescue Needed By: thetragichero on Fri, 19 April 2019 13:28
		Re: K200A-1 Power Amp Rescue Needed By: stevem on Sat, 20 April 2019 06:20
		Re: K200A-1 Power Amp Rescue Needed By: chicagobill on Sat, 20 April 2019 12:59
		Re: K200A-1 Power Amp Rescue Needed By: JDinPA17603 on Sat, 20 April 2019 15:10
		Re: K200A-1 Power Amp Rescue Needed By: chicagobill on Sat, 20 April 2019 22:09
		Re: K200A-1 Power Amp Rescue Needed By: stevem on Sun, 21 April 2019 06:06
		Re: K200A-1 Power Amp Rescue Needed By: JDinPA17603 on Mon, 22 April 2019 02:41
		Re: K200A-1 Power Amp Rescue Needed By: stevem on Mon, 22 April 2019 06:09
		Re: K200A-1 Power Amp Rescue Needed By: JDinPA17603 on Mon, 22 April 2019 10:27
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Mon, 22 April 2019 11:27
		Re: K200A-1 Power Amp Rescue Needed By: stevem on Mon, 22 April 2019 12:19
		Re: K200A-1 Power Amp Rescue Needed By: JDinPA17603 on Mon, 22 April 2019 12:39
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Mon, 22 April 2019 23:47
		Re: K200A-1 Power Amp Rescue Needed By: stevem on Tue, 23 April 2019 06:14
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Thu, 25 April 2019 10:11
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Thu, 25 April 2019 12:27
		Re: K200A-1 Power Amp Rescue Needed By: chicagobill on Thu, 25 April 2019 13:18
		Re: K200A-1 Power Amp Rescue Needed By: JDinPA17603 on Thu, 25 April 2019 14:10
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Thu, 25 April 2019 14:17
		Re: K200A-1 Power Amp Rescue Needed By: JDinPA17603 on Thu, 25 April 2019 14:48
		Re: K200A-1 Power Amp Rescue Needed By: chicagobill on Thu, 25 April 2019 15:21
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Thu, 25 April 2019 16:28
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Sat, 27 April 2019 22:20
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Sun, 28 April 2019 00:14
		Re: K200A-1 Power Amp Rescue Needed By: stevem on Sun, 28 April 2019 06:04
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Sun, 28 April 2019 09:34
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Wed, 08 May 2019 00:51
		Re: K200A-1 Power Amp Rescue Needed By: JDinPA17603 on Wed, 08 May 2019 18:39
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Thu, 09 May 2019 17:31
		Re: K200A-1 Power Amp Rescue Needed By: chicagobill on Fri, 10 May 2019 12:07
		Re: K200A-1 Power Amp Rescue Needed By: stevem on Fri, 10 May 2019 12:17
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Wed, 15 May 2019 12:20
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Fri, 17 May 2019 16:46
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Fri, 17 May 2019 19:47
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Fri, 17 May 2019 21:46
		Re: K200A-1 Power Amp Rescue Needed By: stevem on Sat, 18 May 2019 05:54
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Sat, 18 May 2019 10:40
		Re: K200A-1 Power Amp Rescue Needed By: stevem on Sun, 19 May 2019 05:54
		Re: K200A-1 Power Amp Rescue Needed By: JDinPA17603 on Sun, 19 May 2019 08:37

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