[ARC5] No Doubt Dumb Tube Question

[Glen Zook]

No!

The 5V4 and 5Z4 are indirectly heated cathode full-wave rectifiers.
 
Glen, K9STH


Website:  http://k9sth.com


________________________________
 From: "WA5CAB at cs.com" <WA5CAB at cs.com>
To: arc5 at mailman.qth.net 
Sent: Monday, June 17, 2013 11:53 AM
Subject: Re: [ARC5] No Doubt Dumb Tube Question
 

AFAIK, all of the 5.0 VAC heater 4-pin and octal base rectifiers have 
directly heated cathodes.  The reason (or one reason) is voltage rating.  It's 
easier to get an efficient cathode with a high voltage rating by putting the 
requirement on the transformer and not on the tube.  Several of the tubes 
have PIV ratings above 1400 volts.