At this point in the build I seem to have rather high B+ voltages. My ckt is a 2 channel clean (Clean 1 = Fender, Clean 2 = Dumble) and the dumble ckt is a dlite. Right now I'm just working on the Fender channel and have the other stages grounded out (inputs).
B1 = 460v
B2 = 459
B3 = 448
B4 = 357
B5 = 332
Really no drop across the choke. After the choke my R's are
1.5k
20k
10k
150k
I'm also fighting a bad hum problem.
Any suggestions?
Voltage problems
Moderators: pompeiisneaks, Colossal
Re: Voltage problems
Yep...
PI dropping should be a 3.3K wirewound.
Then 22K and 2.2K
You guys keep following the Dlite schematic which is based on Dumble with some changes made to accomodate 6V6 tubes and lower PT voltage. Check Higains 101 schematics. They are more "accurate" for regular builds.
PI dropping should be a 3.3K wirewound.
Then 22K and 2.2K
You guys keep following the Dlite schematic which is based on Dumble with some changes made to accomodate 6V6 tubes and lower PT voltage. Check Higains 101 schematics. They are more "accurate" for regular builds.
Re: Voltage problems
Well, Found the hum problem. Coming from the relay ps. I have a separate set of windings supplying 22vac to a bridge rect, 7812 with a 100uf cap across the ouput.
Can you suggest another method that would produce less hum?
Rut
Can you suggest another method that would produce less hum?
Rut
Re: Voltage problems
On this relay supply, would it hurt anything to put a cap from the relay ground to chassis ground? This gets rid of the hum. (I don't have the two grounds connected since doing so causes everything to heat up on the relay board.
Rut
Rut