[ARC5] Power supply voltages for ARC-5 receivers

[Dennis Monticelli]

You might disconnect a few caps one at a time via the chassis grounding
screw and measure the leakage current. I just slip a business card between
the chassis and the bathtub cap.  Assuming you wish to keep it original,
how much those caps leak will determine how much voltage you can get away
with.

I run mine off around 60 to 70V.  It pulls 10mA at 60V and allows the use
of a stack of 9V batteries (50 hr life) for portable or simply to avoid
bringing the line noise near it.

Dennis AE6C

On Sun, Feb 2, 2020 at 12:47 PM Bob Groh <bob.groh at gmail.com> wrote:

> Thanks to all for the responses.  Pretty much gives me exactly what I need
> - 140 VDC and up to ??200 VDC at 60 mA or so.  Lower is probably better
> given the age of most of these radios.  Works for me.
>
> Bob, WA2CKY
>
> On Sun, Feb 2, 2020 at 2:43 PM Doran Platt <jeepp at comcast.net> wrote:
>
>> FWIW, I use 140v and it appears to be a sweet spot.  No genuine loss of
>> sensitivity specs , although audio gain is down ever so slightly.
>> K3HVG
>>
>> On February 2, 2020 at 12:51 PM Bill Cromwell < wrcromwell at gmail.com>
>> wrote:
>>
>>
>> Hi Bob,
>>
>> RE: your other post: I have seen ads (not from commercial resellers)
>> offering a radio here and there on the list. The sky did not fall:)
>>
>> Some of us use 90 volts B+ (including me) and some others suggest 180
>> volts is better. It seems somewhere from 90 to 180 works very well. Some
>> people have used B+ as low as 12 or 24 volts but even with bias
>> modifications to the radio they said performance was "a little less".
>> The 200 volts plus from the dynamotors is NOT needed. In the high
>> altitude bombers it may have helped keep the radios warm. Most of us use
>> them at or near room temperature :) In those bombers temps were well
>> below zero F.
>>
>> 73,
>>
>> Bill KU8H
>>
>> On 2/2/20 11:19 AM, Bob Groh wrote:
>>
>> The design is not the problem but I wonder if there is any consensus on
>> the B+ voltage and current?  Filament is fairly easy to figure out so
>> that is not a problem.  Thanks.
>>
>> Bob Groh, WA2CKY
>>
>>
>>
>> --
>> bark less - wag more
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