Great friday humor !!!
Gary...wa6fgi
----- Original Message -----
From: "Robert Bonner" <rbonner@qro.com>
To: "'Paul M Dunphy'" <amplifier@ve1dx.net>; "'Amplifier- List'"
<amps@contesting.com>
Sent: Friday, April 20, 2007 5:56 AM
Subject: Re: [Amps] ACOM-1000 replacing tubes
> Official Safety Announcement from the AMATEUR RADIO SAFETY COUNCIL
>
> Since there have been a rash of Ham Operators changing their final tubes
> with the amplifiers running and making power recently we highly recommend
> seeking a highly trained technician to perform the tasks at hand if you
> don't feel up to the complex nature of these procedures.
>
> If you cannot or will not heed this warning we highly recommend this
> procedure:
>
> Please turn the amplifier power switch off and remove the line cord from
> the
> wall before removing the covers. (Blown .82 ohm resistors in L4-B's prove
> this isn't necessarily the case.)
>
> Before reaching in and grabbing on to something inside the chassis, use a
> shorting wand to make sure all voltage is removed from the supplies. On
> tetrode amps, you might want to short the screen supply and don't forget
> those pesky 12 and 26V relay supplies as they've been known to blow off
> limbs if you come in contact with them.
>
> It is highly recommended to look around and visualize the configuration of
> leads and interlocks of your amplifier. This will assist you in
> reconnecting HV leads and flipping interlocks to their proper places.
>
> Finally before grabbing your bottles, make sure the GLOW ON THE PLATES has
> subdued from a bright Orange Color to at least a dull red or darker to
> avoid
> burns which may or may not require skin grafts.
>
> Once the change out has been accomplished, please return all HV leads to
> their proper places and replace covers to avoid interlock and shorting
> bars
> from doing additional damage to the amplifier while attempting to do their
> job. Which BTW is generating factory service of the amplifier after
> severe
> damage occurs from shorted HV interlocks. The problem is this amplifier
> has
> outlived the factory itself and all qualified factory service personnel.
>
> Replace line cord to outlet and use a pencil or other pointy object to
> flip
> the main power switch on while cringing and leaning as far from the
> amplifier as possible.
>
> We here at the AMATEUR RADIO SAFETY COUNCIL hope you will have a safe and
> powerful day.
>
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of Paul M Dunphy
> Sent: Friday, April 20, 2007 4:41 AM
> To: Amplifier- List
> Subject: [Amps] ACOM-1000 replacing tubes
>
> I've pretty much talked myself into getting an ACOM-1000. Even
> with the prices of the 4CX800As increasing, I'm still impressed with
> this amp. The one reservation is that the manual says, "Replacement
> is a complex and potentially dangerous operation. For this reason we
> recommend this work be carried out by a trained service technician."
>
> How "complex" is this? I've been changing tubes in older amps
> like Clipperton-Ls, TenTec Centurions and AL-811Fs for years. I have
> friends who routinely have replaced 8877s in AL-1500s, 4CX800as QRO
> Technologies, etc.
>
> I don't want something so complex that I have to send it back to
> the supplier to change a tube! It's too bad the manual was a bit
> more specific on what is involved. Has anyone changed one, or know
> what they are referring to in terms of it being complex or
> dangerous? I don't expect to have to do this often (probably once
> every 5-10 years), but tubes are tubes in any amp, and eventually
> they wear our. I'm not an Electrical Engineer, but I'm pretty good
> at electronics and I've been playing with amps and the like for 20+
> years. I can't imagine it is that bad.
>
> Thanks!
>
> 73, Paul VE1DX
>
>
> --
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