[TenTec] century 22 fault fixed

[James Parsons]

I am not clear. What does faulty flux do? I have been soldering for almost
60 years and have never had a "faulty" problem with flux. Does it develop a
low resistance? I don't understand what becomes faulty about flux? I assume
it develops a low resistance because of chemical changes in the material. Is
that correct?

Jim, K5ROV
James (Jim) Parsons, K5ROV,   CMSgt, USAF, Ret.,   Ham for 60 yrs.
k5rov@arrl.net,     QCWA, ARCI, Fists, ARRL, ARMS.
EX: W1RLA, K5FBB, K4FEO, SV0WN (CRETE), SV0WN (RHODES),
DL4NC, DL4JP, KA2FC (JAPAN), KA2JP (JAPAN).
JOHN 3:16



----- Original Message -----
From: "Bill Stevenson" <sparks98@g4kki.freeserve.co.uk>
To: <tentec@contesting.com>
Sent: Friday, January 19, 2001 19:16 PM
Subject: [TenTec] century 22 fault fixed


>
> thought you might like to know that the century 22 is now back in
operation
> after 2 months off air !
> The fault was actually a combination of two things,
> 1) there was a lot(i mean a lot)
> of old flux on the back of,and front of the PA board.This was causing
> problems around the first transisitor ,near the input.when going to
transmit
> it's collector went wild !
> 2)The PA transistors were faulty !,i had checked them with a VOM and they
> appeared ok,
> also when the power was turned right down they seemed to work,anyway i
> finally replaced them with
> a new pair of 2sc1969's cleaned all the pa board with solvent( some sort
of
> alcohol,can't spell it !!) and put it all back together and hey presto it
> worked.
> I never dreamed that the old flux would cause such a problem.That was the
> main cause and probably caused the pa transistors  to go faulty,(they
> weren't open circuit !)
>
> 73's de Bill G4KKI
> Member of R.I.G. RSARS.1596..FISTS 7709.
>
> Web site at http://www.g4kki.freeserve.co.uk/
>
>
> --
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