[ARC5] Converters for Q5-ers (PS hum)

[Bill Cromwell]

Hi Dennis,

I don't know if I posted the current drains I get here or not but my 
results are right in line with yours. Somebody else asked me in private 
so I guess I posted the info on a different list where this has been 
recently discussed. You don't get any bragging rights for confusing me 
because it's too easy <evil grin>. I measured 16 mA at 90 volts and 8 mA 
at 45 volts. I'm sure the audio with speakers will really suffer but I 
don't notice much difference with my hi-Z Trimms.

I have heard of some people who get radios like this to function at 12 
volts B+! I have not moved the limbo stick that low.

73,

Bill  KU8H


On 01/20/2015 05:04 PM, Dennis Monticelli wrote:
> FYI.  My re-cap'd BC-453B pulls 10mA off 60V.  Not much at all.  Of 
> course you pay some price in terms of overall gain and audio output, 
> but the sensitivity is still good enough that antenna noise 
> dominates.  As I drop B+ further (heading for 24V) I find that the 
> first function that dies is the BFO.  Some radios are still running OK 
> at 24V and some lose the BFO.  Maybe a fresher tube would make the 
> difference.  I know some folks run them that low successfully.
>
> Dennis AE6C
>