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Messages - Jazz P Bass

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1
"Yep. Tried that and even with the input to the power amp shorted it keeps making noise."
So it's in the power amp.
Or the power supply.
Have you monitored the power supplies when the issue occurs?

2
Have you tried inserting a signal in to the Power Amp In jack?
By doing this you isolate the preamp from the power amp circuit.

3
Schematics and Layouts / Re: peavey musician series 400series foot switch
« on: January 09, 2021, 12:21:21 AM »
If you look real close there should be numbers on the rear of the plug.

4
Schematics and Layouts / Re: peavey musician series 400series foot switch
« on: January 05, 2021, 10:36:07 AM »
Conflicting info on this one.
On the left is a rate & depth control for Tremolo.
Assuming the 400-210 is the same as the schematic posted, then Pin #1 of the ft sw socket will turn on & off both the Distortion & Fuzz circuits.
No either or. Simply both.

5
Schematics and Layouts / Re: peavey musician series 400series foot switch
« on: January 04, 2021, 12:37:00 PM »
Can you post a picture?

6
Schematics and Layouts / Re: peavey musician series 400series foot switch
« on: January 03, 2021, 12:19:11 PM »
Here is a pic of the Musician 400.
Does yours look like this?
Rate & Depth are the Tremolo controls.

7
Schematics and Layouts / Re: peavey musician series 400series foot switch
« on: January 03, 2021, 11:20:50 AM »
Not too sure what amp you have.
The Musician 400 schematic that I have shows it having Tremolo.
The schematic does not show a footswitch activation for Distortion, just Fuzz. (Pin #1)
The manual states that pulling Pin #1 low (activate Fuzz) turns on Distortion/ Fuzz.
You might want to call Peavey and ask for the correct schematic.


8
Schematics and Layouts / Re: Valve Tremolo - Help Wanted Please
« on: December 27, 2020, 12:11:51 AM »
I don't think that you have it right as of yet.
The output is cathode biased not fixed as in the Fender.
Why not hook it up as I stated in my last post.

9
Schematics and Layouts / Re: Valve Tremolo - Help Wanted Please
« on: December 26, 2020, 11:13:05 AM »
Why not simply copy the one circuit and place it in yours.
At the junction of R23/ R24. (remove the Ground connection)
The Fender circuit is slightly different as it is a fixed bias amp.
Yours is cathode biased.

10
Schematics and Layouts / Re: Valve Tremolo - Help Wanted Please
« on: December 25, 2020, 12:11:16 AM »
It does not look as if the Tremolo is connected properly.
It "normally" feeds the bias of the output tubes.

11
The Newcomer's Forum / Re: Mike700 transistor and mje800 transistor
« on: December 18, 2020, 12:23:59 PM »
Leave the Black Lead attached to chassis when taking voltage measurements.
The negative voltage can be read at R 63. (Red Lead)
The rectifier side should read -46Vdc and the other side has a zener diode (CR30) attached which will drop the voltage to -15Vdc.

12
The Newcomer's Forum / Re: Mike700 transistor and mje800 transistor
« on: December 17, 2020, 11:34:21 AM »
Peavey schematic indicates Volts dc.

13
The Newcomer's Forum / Re: Mike700 transistor and mje800 transistor
« on: December 17, 2020, 12:40:24 AM »
Thank you, Enzo.

15
The Newcomer's Forum / Re: Mike700 transistor and mje800 transistor
« on: December 16, 2020, 07:27:01 PM »
I cannot find a schematic for this model amp.
Do you have one?

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