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Re: [Amps] Amp Warm-up??

To: Bill Turner <>
Subject: Re: [Amps] Amp Warm-up??
From: Jim Klein <>
Date: Sun, 8 Apr 2018 10:12:28 -0700
List-post: <>
Instant on tubes require no such treatment however common sense dictates
proper tune and load conditions.I ran 4-1000A tubes for many years and
after going to the indirectly heated cathode types:3CPX5000A7/YC-156A,etc,
I have always  followed warm-up procedures and of course cut-off bias when
implemented properly protects fragile internal components.73

On Sat, Apr 7, 2018 at 8:25 AM, Bill Turner <> wrote:

> ------------ ORIGINAL MESSAGE ------------(may be snipped)
> On Fri, 6 Apr 2018 09:26:18 -0700, N6FFC wrote:
> >have a Question about
> >?Warming-up? the Tube!
> All transmitting tubes should be warmed up before drawing plate
> current. It's OK to apply plate voltage immediately, but be sure they
> are biased to cutoff during warmup. Zero plate current until warmup is
> complete, otherwise the cathode can be damaged.
> Consult the manufacturer's data sheet for warmup time. It varies
> greatly between tube types.
> Small receiving type tubes apparently are exempt from this requirement
> or at least I have never seen such a requirement published.
> 73, Bill W6WRT
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