How does one leave the HV off the tubes ? Do you mean to go in and
disconnect an HV lead or leads ?
Or do you mean to turn on the power and not apply any drive for a long time
? It would seem awkward to physically disconnect the HV. Then too I have
read much (rather heated) discussion on-line that says that heaters alone do
not energize the getter enough to do any good. Comments on this ?
----- Original Message -----
From: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
To: <tentec@contesting.com>
Sent: Saturday, October 13, 2007 12:16 AM
Subject: Re: [TenTec] bringing up an old amp
> On Fri, 2007-10-12 at 20:51 -0700, Chuck & Vicki Tifft wrote:
> > That is an good procedure, except I would remove the tube(s) first. Many
> > tube types could be damaged from lack of sufficient cooling at reduced
line
> > voltages. Many tube types can generate a lot of heat even at
significantly
> > reduced filament voltage.Enough heat to damage seals or warp internal
> > structures. The danger here is that many blowers and or fans do not move
> > much if any air at reduced line voltages. After the power supply is
> > operating properly the tube(s) can be replaced and the amp brought up
> > normally. Here too I would leave the high voltage off the tube(s) for 30
> > minutes or so to give any gas that may have built up over the years, a
> > chance cook off .
> > 73's es GL
> > Chuck
> > W6RD
>
> Tubs that have not been run in year, need more like 24 hours of filament
> or heater alone to warm up the getter deposit and to outgas the heater
> and cathode or filament. Two days doesn't hurt.
>
> 73, Jerry, K0CQ
>
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>
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