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Re: [Amps] Amp “Warm-up”?

To: Bill Ashby <>
Subject: Re: [Amps] Amp “Warm-up”?
From: Kim Elmore <>
Date: Fri, 6 Apr 2018 08:47:06 -0500
List-post: <>
The AL-80 series uses a 3-500Z, which uses a thoriated tungsten filament as a 
directly heated cathode. It takes less than 10 s to reach full temperature, 
which is where the 10 s required warm up comes from. After 10 s, you’re good to 

Many other tubes use an indirectly heated cathode that can be damaged if 
operation is attempted before it reaches full temperature. These require a 
minute or two to warm up and almost always have a lockout circuit that prevents 
operation too soon. 

Kim N5OP

"People that make music together cannot be enemies, at least as long as the 
music lasts." -- Paul Hindemith

> On Apr 5, 2018, at 22:27, Bill Ashby <> wrote:
> Good Evening All!
> I have an Ameritron AL-80B Amp, which i have had for just under a year, and
> have a Question about
> “Warming-up” the Tube!
> First, i must confess that I’m in the generation that held that Tubes
> Should be “Warmed-up Prior to
> Actually hitting them with “Full Power, and my Question is this: Should i
> After turning the Amp “On”
> Should I Wait for the Tube to “Warm up” Prior to using the Amp. Or is it
> “Safe” to just Turn the Amp
> “On, and Not Worry about Warming the Tube Up Prior to using “Full Power?
> The Beauty of “Solid State devices is that the Power Transistor(s) DONT
> “Need” to “Warm-up and
> Can be used, running Full Power when the Amp is Turned On!
> Please Advise!
> Thanks for Any and All of your Comments!
> -73-
> Bill
> -- 
> Take Care, God Bless you and your Family! -73- Bill
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