[R-390] OT: Low-voltage tubes

[bw]

Which Barry?

Forty bucks you say? I think I have a lot of those around here. I keep
tossing the under 6 volt tubes in boxes for cataloging one day. I seem to
remember being peeved at so many 1L6s in a big box of free tubes.


Barry non-Hauser


> Barry,
> 
> Beware:
> 
> 1) The 1L6 is worth forty bucks if it is working.
> 
> 2) IF you have an open filament in one tube, AND you run the radio on the
> power line, AND you then plug in a good tube, ALL The tube filaments will
> BLOW OUT.   This is because the filament filter cap has charged up to a
> high voltage and will apply excessive voltage to the whole string when you
> plug in the last non-open tube.
> 
>>  I put them in my tester and did not notice any glow
>> but without the glow, some still tested okay.
> 
> The total filament power is extremely low.  Do your testing in the dark and
> use a magnifying glass to see the glow.
> 
> Roy