[ARC5] Receiver Voltages

[Peter Schleuss]

Very interesting discussion.
I can confirm the claim of Dave , AB5S, that working with a sub 24V B+ 
is possible.
Due to the availability of a HP 6209B variable PS, some months ago I wanted
to find the low end of the B+ range. To my utter astonishment one of my 
BC453 was  able to
receive the AM transmission of a very strong commercial station at a B+ 
of  11V
(in words: eleven volts), although the BFO refused to oscillate at that 
low voltage.
With B+ of 24V, reception of several european commercial LF stations was 
possible
For the test a headphone was used and the AF level was quite low...
As a double check I took the B+ from  the 12V DC filament PS.

Of course this chance find might be due to a happy coincidence (e.g. 
combination
of sound tubes in that very 453. It would be interesting to check the 
possibilty of very
low B+  operation with other ARC5 samples.

73 de Peter   HB9RUZ