5e3 voltages

[studioit]

Does anyone know where I can find a list of actual voltages for the original 5e3. The schematics (orig fndr) don't list them and I've searched on the here forum but can't find anything either.
Thanks

[TD_Madden]

when you find them remember that the wall-voltage at that time was 110.

[bob p]

IIRC the voltages aren't on the schematic, but some of them are on the layout diagram.

[Satamax]

370/375 on the power tube plates. You might be able to calculate the voltage drops on the other resistorsd in the B+ line.

[studioit]

"when you find them remember that the wall-voltage at that time was 110."

I know , and thanks, but I'm just interested in the average voltages for the original as a comparison. Is 320 volts ac per side about right for an original PT B+, unloaded, if it were actually fed 110 on the primary?

There are many ways to get there, once you know where your going.
Thanks
Ian

[Satamax]

" Is 320 volts ac per side about right for an original PT B+, unloaded, if it were actually fed 110 on the primary?



Ian, 320 is way too much imho. That'd give you 410/390 with the stiffest of the rectifiers. There may be a trick, if you have enough rectifier heater voltage you could use two 5U4 in series. Or may be if you have a spare pair of amps on the 6.3, you could stuff an EZ81 in series with your rectifier to drop further the voltage.


HTH.

Bye.

Max.

[studioit]

320v is what the PT Mission sells is listed at(MA20).
Some are even higher - Mercury Mag has one that's 350 v.
Thats why I'm curious what the original voltages were.
Ian

[studioit]

weber has one listed at 340 v and triode electronics has one that's 350v
They all claim to be correct.

[Satamax]

weber has one listed at 340 v and triode electronics has one that's 350v
They all claim to be correct.


Hell, yeah for a deluxe reverb may be, not for a tweed!