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In Reply to: RE: Power tubes to match Chicago power transformer PSC-165 and SC AP-50 Chasis posted by hkyak@cycu.edu.tw on January 03, 2017 at 18:08:54
That 165 mA. is for a tube regulated supply, presumably with a cap. I/P filter. Some info. I scrounged off the WWW shows a 430 V. rail, which confirms the cap. I/P idea.
Can you "breadboard" a SS rectified choke I/P filter PSU and see how much current you can draw, before the trafo becomes too hot to touch? Pulling something like 300 mA. would not be surprising. To protect the SS diodes against inductive kick back spikes, use a HIGH WVDC 0.01 μF. cap. in what would be the I/P position of a CLC filter. Series wired pairs of UF5408s will provide the necessary PIV capability and the 3 A. capability should be highly "idiot resistant".
Eli D.
Follow Ups:
I should probably mention that I have a pair of Stromberg Carlson AR-432 mono integrated amps that have 5U4 rectfiers and push-pull 7027s that were rated at 30 watts. I am using 6L6GCs instead of the 7027s and they sound very good to my ears. That is the reason I want to try 6L6GC in single ended pentode mode. The Sovtek 5881s are rumoured to be quite close to 6l6GCs, being able to run safely at about 500V and dissipate about 26W max. Besides the 20ish Sovtek 5881s, I also have a pair of spare 6l6GCs, my thinking is I will design the amp with the 5881s specs so I can roll in the 6L6GCs for comparison.
You are right, Eli. The specs are for regulated supply as per the catalog. I would do what you suggested if I could but unfortunately I am electronically inept to perform what you suggested. I love vintage tube stuff and own plenty of Stromberg Carlson, Ampex, Heathkit, Dynaco preamps and amps, but am not capable of reading or repairing electronic circuits. Hence I rely heavily on my tech for designing, building, and fixing them. I do, however, design and build my own loudspeakers as a hobby (with help from carpenters to cut the wood).
The reason I ask for advice on this project is I want to begin to learn simple tube amp design, starting from single-ended class A. And I thought I'd start from what I have at hand. What I don't have now is a pair of OPT, and once I decide on what tubes to use I can go ahead and order them.
I guess my question is, do you think my design reasonable and feasible?
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