Re: A question about vacuum tubes

[SteveOrdinetz <steveord@bit-net.com>]

Dan Strassberg wrote:
>A 50C5 should be safe in a socket meant for a 35C5 and should not damage the
>radio, _provided_ that the tube filaments are not in series. Many radios of
>that day had the filaments in series and the series string was connected
>directly across the 115V rms ac line.


Pretty safe bet that the filaments are in series in this radio.  Most 
radios with a power transformer had 6 V or 12 V filaments (1st digit in 
tube would be a 6 or 12).  I've never seen a radio with 35 or 50 V 
filaments where it was off a transformer.  My guess is that this radio is a 
6 tube model...the 50C5s tended to be in 5 tube units (All-American 5).