Voltage doubler configuration?

[whoaru99]

Going to recap an amp and this one uses a can cap in the voltage doubler for the HV supply. Best I can tell, it's wired up as in the lower left panel, with C1 & C2 being the common ground can cap.

Since I'm going to try restuffing the can I have leeway in how I wire up the replacement caps.

Based on trying my hand at LTspice simulation, the connection method of the doubler in the lower right panel appears advantageous from a ripple voltage and ripple current standpoint.

Is there any reason I should not (or can't) go with the HV doubler configuration shown in the right panels?

(the vertical and horizontal axes of the two wave graphs are the same)

 

[gadget73]

The second one is the typical configuration you see. Don't see why it wouldn't work provided your output voltage and such is where it belongs. I might consider bumping the values on the doubler caps though. 30uf is fairly low, even for vintage amps. 100uf or so was more typical.

 

[whoaru99]

Yes, I have 100uf caps for C1, C2, and C3. I just modeled on the original values.

 

[dcgillespie]

The bottom left configuration "will" double, but it is a poor configuration to use, since the charging current of C2 is reduced by the impedance of C1. Therefore, its ripple and regulation qualities would in fact be poorer than that of the traditional configuration. I'd change it!

Dave