Re: Given that, what are you asking?

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In Reply to: Given that, what are you asking? posted by Chris O on January 30, 2007 at 05:56:23:

Chris,
Although I've repaired many tube power supplies, mostly replacing bad electrolytics and/or upgrading them to polypropylene or oil caps, I haven't done much design of a power supply when starting from scratch, especially with a slightly unusual power transformer with somewhat unknown specs. I suppose you could say that I'm floating some ideas to make sure I'm not doing anything obviously wrong--or underestimating what's possible. It seems to me that I am somewhat limited by the fact that both HV secondaries can't be combined as one B+ supply--unless one could use the method of incrementally turning a choke input supply into a quasi-capacitor input supply to raise the B+ of one to the DC voltage of the other. I've never seen that done before, and I'd be wary of doing such a thing without fully understanding it. I do understand the process of raising the output of a single choke input supply by the use of a small capacitor.
In terms of goals, I was thinking perhaps a standard push-pull ultralinear amp with a pair of KT88s. Or might I have enough B+ current for a quad of EL34s? I have plenty of heater current (at least 9Amps).
Also there's the question of whether to make the higher voltage winding (with higher DC resistance)the main B+ supply for the power tubes by nudging the B+ up with capacitors or turning the lower voltage winding (with lower DC resistance) into a full capacitor input supply. The lower voltage secondary winding seem fairly close to the HV winding of a Dyna MkIII P782: similar DC resistance and voltage output. Based on the ratio of DCR to voltage, I would *guess* that both HV secondaries are wound with the same wire gauge...
David

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Follow Ups Full Thread

Topic - Power Transformer with Dual HV Secondaries Pt. II - David Anderson 18:44:23 01/29/07 (6)

First find the schematic and bridge the chokes and find out their inductance.. - grhughes 07:32:14 01/30/07 (2)

Re: First find the schematic and bridge the chokes and find out their inductance.. - David Anderson 12:33:20 01/30/07 (1)

I would just build on what you have..... - grhughes 13:58:17 01/30/07 (0)

Given that, what are you asking? - Chris O 05:56:23 01/30/07 (2)

Re: Given that, what are you asking? - David Anderson 08:11:10 01/30/07 (1)

You have all that you need (and more) - Russ57 10:51:38 01/30/07 (0)

Follow Ups

Re: Given that, what are you asking? - David Anderson 08:11:10 01/30/07 (1)

You have all that you need (and more) - Russ57 10:51:38 01/30/07 (0)

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