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
----- Original Message -----
From: "Bob McGraw - K4TAX" <RMcGraw@Blomand.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Friday, October 12, 2007 6:56 PM
Subject: Re: [TenTec] bringing up an old amp
Start with the Variac at zero, be sure the amp is set for 240 volt primary
and use the 240 Variac. Turn on the amp and bring the voltage on the
Variac
up 20 volts per hour. That will take 12 hours to get to nominal line
voltage. If there are any unusual signs, noises, hiss or otherwise, shut
it
all down and investigate.
73
Bob, K4TAX
----- Original Message -----
From: "Clark Savage Turner" <csturner@kcbx.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Friday, October 12, 2007 5:23 PM
Subject: [TenTec] bringing up an old amp
Anyone have a quick link or a reference to the right way to bring up an
old amp power supply? I have a variac for both 120 and 220, and I got
an old friend's Drake L4B, not used for at least 10 years (maybe more)
and nothing was apparently wrong when it was stored (he was looking for
chimney's of some sort). I'd like to bring the power supply up so that
the electrolytic caps will work once again. I'd love to find basic,
detailed instructions, its something I've never attempted before.
Thought I'd ask here, most trusted list I know :-)
Now, for Ten Tec content, I still have several (cycolac?) panels from
the satellite box, I think these panels would fit the Argonaut 505 and
509 maybe, I can measure them again if you are interested, I just want
to send them out to someone who might use them.
Clark
WA3JPG
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