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Peavey CS800
Peavey CS800
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Old 28th December 2018, 11:10 AM   #1
Carlosraj is offline Carlosraj  United Kingdom
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Default Peavey CS800

Hi


Please refer to attached schematic. Refer to Q5 (7205, pos pre-driver) and Q6 (7204, neg pre-driver). I would like to know what is the actual part number for this transistor, is it 2N, 2SC,2SD etc. Is there a replacement. Please assist.


Thanks
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File Type: pdf Peavey_CS-800_(C-Series,_7-79)_Schematic.pdf (952.6 KB, 29 views)
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Old 28th December 2018, 01:53 PM   #2
bullittstang is offline bullittstang  United States
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The schematic has 6451 or 6343 above the transistors Q5 power transistor. A quick search pulled up jfets as 2N6451.

IMG_0960.jpg
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Old 28th December 2018, 01:54 PM   #3
indianajo is offline indianajo  United States
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I believe these are the TO-220 package. Peavey is subbing MJE15032 MJE15033 which are the toughest out there. I think in the nineties they were buying 2sa968b 2sc2238b but with the prevalence of fakes from ***** you are better off buying ON semi parts from farnell or RS (in the UK). Peavey had an incoming inspection department that could check for SOA and Ft of the ****ese parts, you don't.
With your incoming insp. department not sorting for gain or Vbe match, you may have to change R30 to eliminate cold crossover distortion. Look for vertical outputs on a scope at low wattage sine wave, decrease R30 with a pot until it disappears. Then replace pot with a fixed resistor.
Best of luck with your repair. Incidently, on the PA forum there are lots of threads about CS800's. PA Systems - diyAudio
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Last edited by indianajo; 28th December 2018 at 02:07 PM.
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Old 28th December 2018, 04:35 PM   #4
llwhtt is offline llwhtt  United States
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If those are TO-202 style transistors then the 7204 is MPS-U10 and 7205 is MPS-U60.

Craig
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Old 28th December 2018, 04:53 PM   #5
Audio1Man is offline Audio1Man  United States
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The 7204 & 7205 are Motorola house number parts. They are special selected parts.
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Old 29th December 2018, 09:00 PM   #6
indianajo is offline indianajo  United States
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Oh, I found them on the semi sub list as TO-126. 6018 is MJE340 and 6019 is MJE350. Sorry.
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Old 29th December 2018, 09:20 PM   #7
llwhtt is offline llwhtt  United States
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I wonder why the Peavey cross reference has MPSU-xx listed as TO-126, MPSUs are TO-202?
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Old 30th December 2018, 09:06 PM   #8
Audio1Man is offline Audio1Man  United States
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Early BGW and others used TO5/TO39 with stud cup mounting as the need for thermal mounting on the VAS was needed. The TO202 still needed some extra heatsinking and it was not easy to mount to the heatsink directly. Later Motorola came out with MJE 340/350 and other devices that were easy to secure to the heatsink. We made the changes and better VAS reliability was greatly improved. I think that Jack did the same for Peavey.
Duke
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Old 1st January 2019, 10:35 AM   #9
Carlosraj is offline Carlosraj  United Kingdom
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Default cs800 slow start

This Peavey CS800 had not been used for a long time. A few days back, I took out the amp, cleaned it dismantle the the preamp and power amp boards. All the power and driver transistors are OK. I checked all the diodes, transistors and resistors on both the preamp boards and they seem OK. I did not check only the capacitors. I did some resoldering here and there and cleaned all the contacts and sockets. I put back everything and turned on the amp. After about 3 to 4 secs, both the relays turned on and the green power LEDs are on. I tried switching the amp ON and OFF a few times, connected the signal and speakers and both channels work fine. The next day, when I turned on the amp, it refuse to turn on, the fan is working, but both the relays and the green power LEDs are OFF. After about 5mins, the right relay and power LED turned on, but it took about 15mins for the left relay and power LED to turn ON. Once both channels have turned ON, then switching the amp ON and OFF repeatedly at time intervals is not a problem .Both channels turn ON within 2secs. Then the same problem repeats, when turning the amp ON the next day. After the 10 to 15 mins delay, the amp comes back to normal operation. Is the problem on the power amp board, preamp board or the power supply board. Please assist.


Thanks
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Old 1st January 2019, 10:38 AM   #10
jazbo8 is offline jazbo8
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Peavey CS800
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