[ARC5] Power supply voltages for ARC-5 receivers

[J Mcvey]

 If the radio has new caps it will run at low/medium volume at around 30 ma. at 250V with a signal.
The screen divider resistors will pull 17ma by themselves at 250V.
The radio will work decently with 24V B+ with the divider ground lug disconnected.However the audio section is almost useless at that voltage.


    On Sunday, February 2, 2020, 12:51:38 PM EST, 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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