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Messages - lakesidepark

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1
Amplifier Discussion / Re: HELP Marshall 5203 Master Reverb 30
« on: March 09, 2019, 10:52:24 PM »
I replaced all capacitors to 35V.

2
Amplifier Discussion / Re: HELP Marshall 5203 Master Reverb 30
« on: March 07, 2019, 08:34:44 PM »
Oh Thanks, I saw other schematics from same era, by Marshall 5205 (Lead Reverb) the transformer is for 21+21V. And the power output stage is very near of 5203.

Maybe AC 19+19 Volts will be an good shot. By looking the first stage after bridge have 2200uF/25V, with a simple calc -> 19 *sqrt(2) = (+/-) 26,9 V with no load, and may decrease to 24.5 V with full load in power amplifier


Thanks

3
As seen in schematic the preamps gone to mixer amplifier before the power amplifier

4
Amplifier Discussion / HELP Marshall 5203 Master Reverb 30
« on: March 07, 2019, 02:33:41 PM »
Hello guys maybe anyone can help me. I bought an Vintage Marshall 5203, but the mains transformer is burned, does anybody have this amplifier model can send me the output voltage.

By the data-sheet of diode bridge I discover it is for 4A -5A, but I still need the secondary AC voltage. All Internet schematics don't have the transformer voltage.

Thanks

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