59 RI Bassman power tranny - zero voltage on secondary side

[Bluefinger]

The attached diagram is from the Rev A schematic. It might be closer to what you have. The transformer part number is 036484.

Again I ask, what Mains Voltage are you trying to use?

As a safety precaution, I suggest you use a "light bulb limiter" (Google it if you don't know what that is) and remove all the tubes until you can power up the amp and measure something close to 6.3VAC on the pilot lamp. A wrong connection on the primary could blow the transformer or a Mains fuse if connections are not right.

As stated above, i am using 230 volts

[Bluefinger]

The attached diagram is from the Rev A schematic. It might be closer to what you have. The transformer part number is 036484.

Again I ask, what Mains Voltage are you trying to use?

As a safety precaution, I suggest you use a "light bulb limiter" (Google it if you don't know what that is) and remove all the tubes until you can power up the amp and measure something close to 6.3VAC on the pilot lamp. A wrong connection on the primary could blow the transformer or a Mains fuse if connections are not right.

Thanks. That tranny diagramm is a match. It was wired for 220 volts which makes sense since mains voltage here was 220 when the amp was new. I might wire it for 240 to lower the voltage a tiny bit.

[Bluefinger]

ok, blk/yel and blk/grn are connected now and it's working and voltages are where they need to be, thanks! I was really missing that split winding.

I am still dealing with a weird hum problem. I get a pretty loud 50 cycle hum that changes it's sound with the tone control settings. The volume controls do not change the volume of the hum except if i turn one of them to 10. From 1 to 9 its there, at 10 it's gone and from 11 to 12 it's there again ... I have to recheck the wiring. Otherwise it sounds great and a lot nicer than before with al those dubious mods it had.

[SoulFetish]

ok, blk/yel and blk/grn are connected now and it's working and voltages are where they need to be, thanks! I was really missing that split winding.

I am still dealing with a weird hum problem. I get a pretty loud 50 cycle hum that changes it's sound with the tone control settings. The volume controls do not change the volume of the hum except if i turn one of them to 10. From 1 to 9 its there, at 10 it's gone and from 11 to 12 it's there again ... I have to recheck the wiring. Otherwise it sounds great and a lot nicer than before with al those dubious mods it had.

Well, the good news is, there is a technique GUARANTEED to rid you of your 50 cycle hum permanently! Turn your amp off, unplug it from the wall, and move to North America. It will then turn into 60 cycle hum.

[Bluefinger]

Well, the good news is, there is a technique GUARANTEED to rid you of your 50 cycle hum permanently! Turn your amp off, unplug it from the wall, and move to North America. It will then turn into 60 cycle hum.

Thanks, that helps a lot

[SoulFetish]

Thanks, that helps a lot

Hey, don't mention it. I solve problems.

[alexradium]

ok, blk/yel and blk/grn are connected now and it's working and voltages are where they need to be, thanks! I was really missing that split winding.

I am still dealing with a weird hum problem. I get a pretty loud 50 cycle hum that changes it's sound with the tone control settings. The volume controls do not change the volume of the hum except if i turn one of them to 10. From 1 to 9 its there, at 10 it's gone and from 11 to 12 it's there again ... I have to recheck the wiring. Otherwise it sounds great and a lot nicer than before with al those dubious mods it had.

Sounds like a bad ground soldering.
Also check out the filament balancing resistors.

[Bluefinger]

Yes, I was thinking about a grounding issue as well. Haven't had the time to have a look at it yet ...

[Bluefinger]

Sounds like a bad ground soldering.
Also check out the filament balancing resistors.

good guess ... it turned out to be a bad filament resistor!