Fender Pro Reverb Silverface 45W with Master Volume schematic?

[neskor]

Hi.
I just got old Fender Pro Reverb Silverface from 1976. in unmolested state.
It is 45W version with Master Volume/Boost switch and 5U4GB tube rectifier. No middle tone pot on both channels.
Trying to find schematic or version but without success :(

[pdf64]

https://el34world.com/charts/Schematics/files/Fender/Fender_cbs_45w_mstrvol_pullsw_super_pro_bmstr_rev_2_.pdf

[vampwizzard]

alsp here: https://schems.com/bmampscom/fender/cbs_45w_mstrvol_pullsw_super-pro-bmstr_rev.pdf

[neskor]

Awesome :)
Checked amp today and everything is working except vibrato is weak.
Tried to change the tube but no change.
I will try to replace roach.

[pdf64]

Perhaps the cathode bypass cap at V5 pin3 has gone bad? I'd try tacking a known good cap across it to see if that helped, before messing with the roach. Swapping to a suitable LED for the bias or that whole optocoupler might be an upgrade.

[neskor]

Thanks,
I will try that first

[Latole]

News vibrato caps may fix the issue if not tube. Replace them all
2 X .01
1 X. .022

Or it is the LDR is weak