[Amps] General question on filament life

[Gary Myers]

Thanks - but I don't think it is quite the same as a light bulb 
since the source impedance seen by the filament, especially in 
amps like the Ten-Tec and ACOM where it is controlled inrush, is 
higher than what a light bulb would see... thus my question... 
even the manufacturer will tell you that turning it on and off 
often will reduce the tube life - but no one puts any objective 
values to it - only subjective...

thanks again for your comment Bob.

g.




----- Original Message ----- 
From: "Robert B. Bonner" <rbonner at qro.com>
To: "'Gary Myers'" <garymyers at powerc.net>; "'Amps'" 
<amps at contesting.com>
Sent: Thursday, February 08, 2007 12:19 PM
Subject: RE: [Amps] General question on filament life


: Probably NO DIFFERENCE.  There are some tubes that can only be 
cycled once a
: day, the 3CX800 and 4CX800 arent them.
:
: With any tube, I'd save the big ON switch until you knew you 
were going to
: need it.  Then figure out what the rest of the day was going 
to bring.  Use
: common sense.  Think light bulb they work on the same 
principle.
:
: BOB DD
:
: -----Original Message-----
: From: amps-bounces at contesting.com 
[mailto:amps-bounces at contesting.com] On
: Behalf Of Gary Myers
: Sent: Thursday, February 08, 2007 12:41 PM
: To: Amps
: Subject: Re: [Amps] General question on filament life
:
: Boy - butchered that message (that is what I get for burning
: the
: candle at both ends)... hopefully the message was understood.
: What reduction in life of a set of tubes would one get if they
: left the amp on for 12 - 15 hours per day most every day vs.
: turning it on and off multiple times.
:
: your CONSIDERED comments are appreciated.
:
: g.
:
::
::
:: Anyone have a feel for what life one might get out of a set 
of
:: tubes if they left it on for say 12 hours a day most every
: day?
:: Is this "better" than cycling power say 3 times each day ... 
I
:: realize these are just "general" numbers... but would like to
:: get some thought from the educated. It has been stated that
:: cycling it is not good - but without details of what 
excessive
:: is this is somewhat lacking in true info. Tom ('JI) had said
:: that filaments are rarely the problem... is there any other
:: downside to just leaving it on? [The amp in particular would
: be
:: either using 3CX800's or 4CX800's - Titan vs. Acom2000A]
::
:: thanks for your considerate comments.
::
:: Gary
:: K9RX
::
::
:
:
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