5F6A bassman and 5E3 deluxe

[Lauri]

5F6A bassman and 5E3 deluxe

[Samgazz77]

Hello Lauri

One question :
On the schematics C20 shows 470uF 100V, but on the PCB is 47uF 100V. I have seen also a version of the same PCB with 47uF 250V.
Mine , after I changed from tube to diode rectifier PS, exploded. It should not be more than 60+V dc on the capacitor.. I am just wondering on others experiece . I am going to replace mine with a higher voltage than 100V for sure
Thank you

[Lauri]

Voltage on the capacitor is about 1/8th of the B+ voltage. Even if the B+ voltage is 500V there should only be about 60V there. 100V capacitor should be enough. Do you have correct values for R37 and R38?

[Samgazz77]

Hello Lauri
I checked R37 and R38 are correct values. But I noticed that R35 and R36 burned as well.. I think that is the source of the cap to explode.
They are supposed to be 100R according to the diagram... looks like lots of current went through...

[Samgazz77]

Probably I have a clue of a possible problem:
I have added a DC bridge for V1 on the heater .
This has a ground connection , not sure where ... so I believe it should not be grounded in both sides (elevate heat circuit and DC bridge)....(according to the Wizard website)
What do you think? I could be in this case?
thanks

[Lauri]

If you're using the same winding for DC and AC heaters then probably shorted the heater circuit with the DC bridge. You don't need DC for V1 heaters, just use AC.

[Samgazz77]

Yes I suspected that... thank you Lauri