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Re: 6S45-PE PSE...

Why not use a 350-400V HT supply and stack the things as SRPP cap coupling a mains toroid between the top 6C45 cathode and 0V ? Battery bias with a chunky NiCad or NimH on the cathode of the lower valve . A 230:6-0/6-0 mains toroid with the secondaries in series will provide about a 3k impedence into an 8r load . I suppose there are plenty of possibilities ! That reminds me , I must try building something with the 7788's !

...FB


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