Ive worked on 3-400/3-500 amps on their side since the tube came out and
never had a failure even when doing quick tuning at reduced power.
I suspect failure reports are either urban myths or due to those Eimac and
other tubes that had the plates come apart from inadaquate assembly. This
was a big problem with some late 80's Eimacs as well as many early Chinese
when they tried to save money by crimping instead of spot welding.
Amplifier repairs since 1963
----- Original Message -----
From: "Phil Clements" <firstname.lastname@example.org>
To: "'Chuck & Vicki Tifft'" <email@example.com>; "'Amps Reflector'"
Sent: Monday, March 24, 2008 5:14 PM
Subject: Re: [Amps] HOME BREW 10-80 METER LINEAR AMPLIFIER 3-500ZG -
eBay(item170202863660 end time Mar-25-08 18:30:00 PDT)
> Subject: [Amps] HOME BREW 10-80 METER LINEAR AMPLIFIER 3-500ZG - eBay
> (item170202863660 end time Mar-25-08 18:30:00 PDT)
> Always interesting stuff on E-pay..I wonder how long the 3-500 lasts
> horizontal?? I've seen more than one die quickly from guys tryin to just
> servive a 3-500 amp laying on it's side. And of course the spec sheet
> for base up or down.
> Large glass tubes have been known to fail just because they were stored
> and/or shipped in a horizontal position!
> Phil, K5PC
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