[ARC5] ARC-2 Information

[Rich Post]

Hi Hue,

The Stancor P-6412 or a Triad N-68X isolation transformer are both the same
physical size and will fit.  According to the articles I wrote for *The
Spectrum Monitor* in January and February 2017, the prices (in 2017) for
the P-6412 at 35 VA was  $22.61 at Allied Electronics and the Triad N-68X
rated at 50 VA was $16.00 from Mouser and only $12.74 from Online
Components, with which I had no experience.  I ended up using the Triad
from Mouser and reversed it so that the voltage would not be increased.  As
you know, the secondary voltage of an isolation transformer is higher to
make up for wire resistance, etc.  The 50 VA rating is higher than the need
so the voltage does not drop enough.  I could have used a resistor but
reversal was simple and would allow slightly cooler running since the
transformer was designed for 115 volts and if reversed, can handle more
before saturation.  The N-68X is also a good solution for our European
friends since its dual primaries can be reconfigured for 230 volts.  Data
sheet is clickable at Mouser and others.

73,
Rich KB8TAD



On Sun, Sep 6, 2020 at 11:55 PM Hubert Miller <Kargo_cult at msn.com> wrote:

> Rich, where did you find isolation transformers compact enough to mount
> right on the chassis?
> Sounds like a great solution though.
> A little off topic, but I had thought of using two small transformers back
> to back for the B+ and
> running the filaments off a separate ungrounded string.
> -Hue
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