[TenTec] Herc II and 9420 duty cycle

[Phil Chambley, Sr.]

I think it would be a good idea to check the idling collector current on the
finals.

Phil K4DPK

VFO Stabilizers and PEP adapters for wattmeters...Check out
http://home.comcast.net/~k4dpk
----- Original Message ----- 
From: "JACrux" <G3JAG at patents.freeserve.co.uk>
To: <tentec at contesting.com>
Sent: Monday, February 21, 2005 5:27 AM
Subject: [TenTec] Herc II and 9420 duty cycle


> My 9420 sits under the bench on a couple of wooden rails, just clear of
the
> carpet, in a very confined space. I do not have any added provision for
> cooling.  I have never burnt my feet on it, and the cat does not come out
> smoking. Which bits are getting so hot ???
> But the 9420 I saw a while back in the repair shop at TenTec had no lid
on; it
> had current meters for each of the four output rails .... and there was
also
> a large fan blowing (as I recall it ...) air into the thing ! You do not
> really need the meters unless you are trouble shooting the Herc finals,
but
> if your 9420 gets THAT hot then maybe you need to make a custom top cover
> fitted with an extractor fan, as long as enough cool air can get in there
to
> be extracted. If you cannot get enough airflow with the lid on, then maybe
> the only answer is to run with the lid off, TT repair shop style, and have
a
> fan blowing into the open top ?  Anyone got any better ideas ?
> John G3JAG
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