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Topic: Peavey Session 400 -- looking for layout |
George Biner
From:
Los Angeles, CA
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Posted 7 Jan 2023 4:16 pm |
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Trying to work on an old, classic Peavey Session 400 (the head unit, not the LTD combo) -- anybody have the layout?
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Guacamole Mafia - acoustic harmony duo
Electrical engineer / amp tech in West Los Angeles -- I fix Peaveys
"Now there is a snappy sounding instrument. That f****r really sings." - Jerry Garcia |
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Jerry Erickson
From:
Atlanta,IL 61723
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Posted 7 Jan 2023 8:03 pm
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| I have a schematic, not a parts layout. Let me know if that'll work for you. |
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George Biner
From:
Los Angeles, CA
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Posted 8 Jan 2023 1:05 pm
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Hey Jerry, I think I'm OK on the schematic. And there is a layout all over the web, but it is smaller and for the combo version.
_________________
Guacamole Mafia - acoustic harmony duo
Electrical engineer / amp tech in West Los Angeles -- I fix Peaveys
"Now there is a snappy sounding instrument. That f****r really sings." - Jerry Garcia |
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Dennis Detweiler
From:
Solon, Iowa, US
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Posted 9 Jan 2023 6:04 am
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Brad Sarno should have it.
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1976 Birdseye U-12 MSA with Telonics 427 pickup, 1975 Birdseye U-12 MSA with Telonics X-12 pickup, Boss 59 Fender pedal for preamp, NDR-5 Atlantic Delay & Reverb, two Quilter 201 amps, 2- 12" Eminence EPS-12C speakers, ShoBud Pedal, 1949 Epiphone D-8. Revelation preamp into a Crown XLS 1002 power amp. |
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Ken Fox
From:
Nashville GA USA
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Ken Fox
From:
Nashville GA USA
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Posted 9 Jan 2023 8:24 am More
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Dirk Edwards
From:
Homedale ,Idaho USA
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Posted 9 Jan 2023 4:02 pm
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Would it be ok to put two 8 0hm EV's on sessions 400 in parallel?
Thanks Dirk |
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Ken Fox
From:
Nashville GA USA
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Posted 9 Jan 2023 4:06 pm Ohms
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Yes. That would be a total 4 ohm load
Not only as the main speakers. Amp cannot tolerate a lower impedance. |
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Dirk Edwards
From:
Homedale ,Idaho USA
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Posted 9 Jan 2023 4:13 pm
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Thank You!!!  |
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George Biner
From:
Los Angeles, CA
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Posted 9 Jan 2023 4:40 pm
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Thanks for the info!
_________________
Guacamole Mafia - acoustic harmony duo
Electrical engineer / amp tech in West Los Angeles -- I fix Peaveys
"Now there is a snappy sounding instrument. That f****r really sings." - Jerry Garcia |
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Dirk Edwards
From:
Homedale ,Idaho USA
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Posted 9 Jan 2023 4:53 pm
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| I have two session 400 now with black widow 15s.Have you ever heard two 12"EVs in a sessions? Good? Bad? |
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Ken Fox
From:
Nashville GA USA
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Posted 9 Jan 2023 5:30 pm
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| Those were an option in the first Session 400 amps. Never saw or heard one but I bet they’d sound awesome |
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Ken Fox
From:
Nashville GA USA
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Lee Baucum
From:
McAllen, Texas (Extreme South) The Final Frontier
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Posted 9 Jan 2023 5:50 pm
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My first steel guitar amplifier was one of those Session 400s with two 12" EV speakers.
Very heavy. Sounded great.
Speaking of heavy, I sold it and bought a Session 500!
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Dirk Edwards
From:
Homedale ,Idaho USA
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Posted 9 Jan 2023 5:59 pm
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That's the one I was looking at  |
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George Biner
From:
Los Angeles, CA
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Posted 11 Jan 2023 2:43 pm
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Thanks, Ken Fox, for posting the layout.
Just wanted to say that the amp (and schematic) I have has a footswitch circuit -- BUT, that layout doesn't have it -- missing the footswitch output terminals and also a transistor and some additional circuitry, plus some component values on the layout are different. Anybody familiar with this version of the amp with no footswitch? Just curious. Ancient history.
(Additionally, the schematic has the main level pot as "master", while the amp itself is labeled "sensitivity". )
The schematic looks to be official Peavey but has no reference designators (R1, R2, etc) for any of the components -- that's pretty wild, never seen that before!
_________________
Guacamole Mafia - acoustic harmony duo
Electrical engineer / amp tech in West Los Angeles -- I fix Peaveys
"Now there is a snappy sounding instrument. That f****r really sings." - Jerry Garcia |
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Check here. Bob Lawrence uploaded my info there. Board layout was not created by me the rest was