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Pet Peeve Peavey (GPS 3500)
Pet Peeve Peavey (GPS 3500)
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Old 30th December 2017, 12:29 AM   #121
Peter S is offline Peter S  Canada
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Hi Indianajo;
I will use the jig from page 8 of this thread, to find a matched set of outputs. This was the test circuit used to select the outputs for my GPS 3500. If I can get this CS 800 to breath, I may spring for a complete set of new outputs ( ON semi's ).

At the moment I am facing the mangled driver board. I have a working driver board from a CS 400. I believe the board is identical. Both are marked "111778 DRIVER CS 800"

Are these boards interchange-able even though B+ and B- are different?

Board on the right is from the CS 400:
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File Type: jpg DSCN0417.jpg (1,006.9 KB, 38 views)
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Old 30th December 2017, 06:58 PM   #122
Peter S is offline Peter S  Canada
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So far, I see only R 16 and R 18 different; 1 k on the CS400 and 2 k on the CS800. Apart from that, the boards seem identical, could I simply change these resistors?
Here is the CS400;
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File Type: pdf Peavey CS-400 (C-Series, 7-79) Schematic.pdf (825.6 KB, 2 views)
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Old 30th December 2017, 07:00 PM   #123
Peter S is offline Peter S  Canada
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Here is the CS800;
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File Type: jpg Peavey CS-800 (series C).jpg (988.1 KB, 37 views)
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Old 30th December 2017, 10:58 PM   #124
indianajo is offline indianajo  United States
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You're on your own unless Enzo contributes. I never heard of CS-400 until I saw a junk one for parts on E-bay last week. Enzo posted on a CS-800 thread yesterday over on PA amps.
CS-400 was more suitable for home use with lower rail voltage, I suppose. I might pick one up. I listen mostly at 1.5 v with +72 db peaks occasionally. The PV-1.3k I own rather scares me with +-85 rails: could launch a $120 speaker cone across the room if something goes wrong and it produces DC. My speakers cost 10 times what the blown amp cost. Speakers harder to find, too, low distortion SP2 speakers with original drivers. The DC protection circuits on the PV series were laughable, at least the 1.3K. Melted the triac off the output board without blowing the main breaker.
Don't know if these early nineties amps were as low distortion at low levels as the CS800s I own. Not specified at low wattages. 4558 as an op amp in the X suffix is nothing to write home about, and the early models are all transistor; who knows how much feedback and slew rate they have? Cs800s just started dropping out on one channel; hours of e-cap replacement and maybe contact cleaning are on the schedule. Right after a couple of organ projects clear the bench.
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Dynakit ST70, ST120, PAS2,Hammond H182(2 ea),H112,A100,10-82TC,Peavey CS800S,1.3K, SP2-XT's, T-300 HF Proj's, Steinway console, Herald RA88a mixer, Wurlitzer 4500, 4300

Last edited by indianajo; 30th December 2017 at 11:12 PM.
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Old 3rd January 2018, 01:44 PM   #125
Peter S is offline Peter S  Canada
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I took the plunge!

I compared every component on the driver boards from the CS 400 and CS 800. Everything is identical except for R 16 and R 18. After making the 'conversion', I installed the board from the CS 400 in the CS 800 amp. The weak socket for the TO 3 driver was bent to make secure contact, and some 'iffy' solder joints on the power pcb were touched up. The dead channel is ALIVE!

Thanks to the info contributed to this thread, I ran the amp with only the 2 drivers and 2 outputs installed, into a 130 Ohm load. 58.3 Volts RMS, before clipping, not bad, I guess!.
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Old 3rd January 2018, 03:50 PM   #126
Peter S is offline Peter S  Canada
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One quick mystery question; what is this?

My guess is a Triac (3 legs and heat sink compound) but I don't see it on version A, B, or C of the CS 800 schematic, this amp does not have "DDT" (switches on the volume pots)
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File Type: jpg DSCN0405.jpg (932.4 KB, 29 views)
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Old 3rd January 2018, 08:26 PM   #127
turk 182 is offline turk 182  Canada
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look at the incoming AC line that triac takes the current rather than the actual switch.
should be in line with the fuse,no?
or is that the one that is used for output "crowbar" protection

Last edited by turk 182; 3rd January 2018 at 08:31 PM.
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Old 4th January 2018, 12:21 AM   #128
Peter S is offline Peter S  Canada
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Hi Turk;
Thanks, I believe you are right, it must be the triac for the AC mains. I'm still not sure exactly what series this amp belongs to. It does not have switches on the volume pots, so I assumed it must be one of the first 'model A's.

I have 2 schematics for the 'C' version; one shows a double pole power switch, the other has the triac.

The triac is been removed from the circuit. Is there any advantage to reconnecting the triac, other than extending the life of the power switch?

And at the risk of redundancy; one more question: Can I order all new TO3 devices (I'm leaning towards ON semi MJ15024's) and use them as drivers AND outputs?
If so, why did Peavey use different drivers?
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Old 4th January 2018, 01:16 AM   #129
turk 182 is offline turk 182  Canada
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i recall something to the affect that the triac reduces in rush current (i recall replacing several double pole switch types due to arced contacts) i'm still looking for a lost pile of my old schematics (that's why i never got you the promised scans) as i have circuit notes written about some of the differences.
i also used to have a master list of "in house" part numbers and proper replacements.
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Old 5th January 2018, 03:15 PM   #130
Peter S is offline Peter S  Canada
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Thanks, turk and all;
A replacement list would be a great help at this point. I have two conflicting Series A schematics; one shows all 12 devices the same on the heat sink, the other has different Drivers.
If possible, I would like to find a common TO-3 that I could use in several of my amplifiers. I have used ON-Semi MJ21196G's in my Phase Linear 700B. According to Newark, the MJ15024 is a 'replacement'. My guess is the PL700B application is more demanding, but....the 15024G's are $6.19 ea and the 21196G's are $4.13 ea (at quantity 50)

Could I use the 21196G as a universal replacement, for the next Peavey or if (when) the next time the Phase Linear decides to have a bad day? Here are the ON Semi pdf's for both devices, Thanks for any thoughts.
Attached Files
File Type: pdf MJ15022-D.PDF (111.6 KB, 1 views)
File Type: pdf MJ21196G newark.pdf (125.4 KB, 1 views)

Last edited by Peter S; 5th January 2018 at 03:23 PM.
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