[Boatanchors] NEED TUBE INFO

[Glen Zook]

Too many people are forgetting that the filament on
the rectifier has to be separate from the rest of the
filaments in the radio.  The filament in all of the
direct heating rectifiers IS the cathode and that is
where the B+ comes from.  If the filament on the
rectifier is connected to the rest of the filaments
then the entire B+ is going to be applied to the
filament "string" and the life of the "other"
filaments is going to be measured in nano-seconds!

Glen, K9STH


--- EP Swynar <gswynar at durham.net> wrote:

I don't know where the notion came up that just
because a rig uses 2.5 filament tubes then, by
default, the rectifier tube has to be 2.5 volts as
well...!
 
Nothing is further from the truth...and I hate to tell
the non-believers reading this, but an 80 is just like
a 280, performance & specs-wise --- the sole
difference *could* be in the glass envelope used by
each, i.e. the older 280-type uses a globe / balloon
envelope, whereas the 80 (or, in the shortened form it
became known as, the '80) has a shoulder-type
envelope...









Glen, K9STH

Website:  http://k9sth.com


       
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