[Boatanchors] Lowering Receiver B+, Again.

[Bob Groh]

Hummmm.  These are a few, somewhat off the cuff comments on the subject:

First, I would use a bucking transformer - probably 12V or so.  This will
have the benefit of dropping the voltages - all of them including the
filaments.

Second I would replace your rectifier with a solid state bridge - but - I
would drive it only off 1/2 of the secondary HV winding. This would reduce
the HV by about 1/2 or there abouts. Got to think a bit more about that -
unfortunately I would really like a solution that takes some current from
each side of the CT.  But somehow got to get a solid state rectifier in
there - saves a bunch of filament power (5V at 2A or so).
At any rate, not a complete solution but I'll give it some more thought.
Certainly ties in with my work with restoring old receivers. More later.

73
bob Groh, WA2CKY

On Thu, Dec 22, 2016 at 10:44 AM, Rob Atkinson <ranchorobbo at gmail.com>
wrote:

> get a small 5 to 10 Hy choke and convert it to choke input supply.
> make sure it can handle the current demand.
>
> 73
>
> Rob
> K5UJ
>
>
> >
> > As originally designed, the output of the full-wave
> > B+ rectifier (type 80 tube) at the capacitor-input
> > filter is a needless 340V
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