[NJARC] Pilot lamp 'flash'
Jim Whartenby
antqradio at sbcglobal.net
Mon Jan 7 16:23:46 EST 2008
Steve
Two zener diodes, 5.6 volt 1 watt in series opposing across the lamps,
assuming the lamps are in parallel. If the lamps are in series use 12
volt 1 watt zeners.
Regards,
Jim
--- sgt88 at verizon.net wrote:
> Visit our web site - See http://www.njarc.org
> _______________________________________________
> Hi all:
>
> Got this radio...two pilot lamps have their voltage taken off the
> 'heater resistor' that is in the series tube filament circuit.
>
> The problem is...the high voltage surge when I first put the radio on
> causes the pilot lamps to 'flash' bright...then they go toooo dim to
> be functional.
>
> I increased the lamp voltage on the wire wound slide-tap on the
> heater resistor...only to blow out the pilot lamps from the surge in
> the attempt get them brighter so I can read the dial...
>
> Circuit calls for 6.3v lamps...using what I 'think' are 6.3...
>
> Any suggestions?
>
> Thanks,
> Steve
> _______________________________________________
> NJARC mailing list
> NJARC at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/njarc
>
More information about the NJARC
mailing list