[Boatanchors] LINE VOLTAGE, FILAMENT VOLTAGE and SANITY

[Ray, W4BYG]

It is well know in the broadcast industry that excessive heater voltage 
_greatly __reduces_ tube life.  This is most acute in transmitting tubes 
because of their cost, but also applies to receiving tubes.

I do not see a way to post a .pdf attachment on QTH.net. Therefore I 
have posted page 14 out of Robert Tomer's excellent 1960 Photofact 
publication entitled "Getting the most out of Vacuum Tubes", on the 
Yahoo group files: FLBoatanchors.

It is valuable and useful reading on the subject.  I hope those 
interested in tubes and Boatanchors are also subscribed to the Yahoo 
list.  For those that are not  subscribed and need, I will reply with 
the attachment by direct email.

73,
Ray, W4BYG

-----Original Message-----
From: Boatanchors [mailto:boatanchors-bounces at mailman.qth.net] On
Behalf Of Bill and Liz
Sent: Tuesday, January 06, 2015 10:14 AM
To: boatanchors at mailman.qth.net
Subject: [Boatanchors] LINE VOLTAGE, FILAMENT VOLTAGE and SANITY

Why all the discussion about filament voltage and monitoring the line?  The
line voltages across North America are probably 12-15 volts higher than they
were when our equipment was designed and built in the 50s.  Install a line
bucker of 10V......just do it!  Don’t worry about the filament voltage-anything
within a half volt of 6.3 won’t adversely affect the operation of your
equipment.  With a line bucker everything runs cooler, and IMHO that is the
REAL reason you would want to use one.  Your power transformer will be
much happier and tubes meant to work at 250V will not be struggling at close
to 300V with high line voltage.

Bill VE3NH
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