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RE: Yes, three 12AX7's ...

With all the bickering.....(give each other a big hug, please) the point of regulator was lost.

IF I understand correctly, when using one of the 78xx regulators you need voltage a couple volts ABOVE the intended regulated voltage before regulation. Maybe, expressed as a %age, 25% or 20% would do.....some help here would be nice....or perhaps a rule of thumb I could remember later.
But, that, as near as I can tell, was the point of the regulator. So, to get 6v to the heaters, you'd need maybe 8 or 9v INTO the regulator.....and apparently a different, non-CT transformer.

And while it is OT for a phono preamp, my CMOY headphone amp taught me this. I have a 24vdc wall wart which I regulated to 18v. Very stable, though no longer 'portable'. Straightforward following a drawing with no improv.
Too much is never enough


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  • RE: Yes, three 12AX7's ... - pictureguy 20:35:47 06/25/12 (1)

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