[TenTec] ARGONAUT 509 SIDETONE

[Ed Worst]

Thanks for the suggestions, Glenn.  I've already done the "rock the pots"
test, with no improvement. I'll try the DeOxit next (I agree, it's a good
cleaner/oxide retardent).  If that doesn't do it, my suspects are:  Q1, Q3,
Q2, C11, C4, C7, and a cold solder connection somewhere (roughly in that
order).  That web page you mentioned sounds like a good idea.  I'll let you
know what I find.

I've always liked the Argonaut 509, but never had one until about a month
ago.  I really like it.

Tnx es 72/73.
ed - k9ew

----- Original Message -----
From: <Wa4aos at aol.com>
To: <tentec at mailman.qth.net>
Sent: Tuesday, September 28, 2004 9:33 AM
Subject: Re: [TenTec] ARGONAUT 509 SIDETONE


> Hi,
>
> The problem can be one of several different components in the sidetone
> circuit but before you heat up that solder iron, try a little DeoxIT
cleaner on the
> tone and level pots, " R 5, R7," in the sidetone circuit.
> Spray a very small amount into the pot and rotate each through it's
rotation
> several times then take a listen.
>
> If you don't have any DeoxIT try rotating each pot to a different position
> and recheck. If one of the earlier owners was a smoker, or even if not, an
hour
> cleaning connectors and switches with DeoxIT can make a pleasant
improvement
> in the overall operation of the unit.
>  I am always pleased with problems solved and improved performance by
using
> this product.
>
> DeoxIT is a product of CAIG labs and one place to get it is from Parts
> Express, 800 338 0531. The price for a single can is about $9.00, a little
pricey
> but fine product.
>
> If that doesn't help, you might check the voltages on Q2 on the audio
board
> for starters. I did once replace Q2 for one of my Argo 509's but in that
case I
> didn't have sidetone at all. The voltages for Q2 are listed on page 3-17
in
> the 509 manual. If you don't have a manual, let me know and I will send
them.
>
> Good thing is that board is easy to access and very easy to work on. You
can
> remove the four screws on the bottom panel and slide it back to access the
> audio board located on the bottom left side as you face the front panel,
"as I
> recall."
>
> The Argonaut is a fine rig to say the least. Often criticized for the
plastic
> side panels and vinyl covered top panel but don't let that discourage you.
In
> it's day it sold for a little over $320.00 which was an excellent price
> compared to other much more expensive rigs.
>
>  I am collecting Break/Fix data for a possible web page that I might post.
I
> would appreciate hearing back from you with your resolution.  Good Luck..
>
> 73,
>
> Glenn WA4AOS
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