On Aug 12, 2004, at 7:45 AM, Clay W7CE wrote:
Thanks to everyone for the quick replies to my question. I will check
the
tube, socket and soldering before concluding that the tube is bad. I
looked
at the solder connections on the sockets and they definitely look like
they
could use resoldering.
Pete, please describe the repair you made. Was it to the socket or to
the
tube pin itself?
I need to acquire some silver solder for some antenna projects and it
sounds
like it will be useful here as well. Is silver solder readily
available or
is it usually a special order?
Clay - We sell 94% tin, 6%, 430ºF, 0.125" diameter silver-solder,
solder (p/n 41.2) for 16¢ per inch. Shipping is $1 per order. The
flux required depends on what one is soldering. For soldering pins on
3-500Zs, copper, or brass, use rosin flux, for soldering Ni-Cr or
stainless-steel, use J/ W. Harris Sta-Brite acid flux. For soldering
aluminum , use J. W. Harris aluminum flux.
Does it require a special flux?
Thanks,
Clay
----- Original Message -----
From: "Pete Smith" <n4zr@contesting.com>
To: "Clay W7CE" <w7ce@curtiss.net>; <amps@contesting.com>
Sent: Thursday, August 12, 2004 3:46 AM
Subject: Re: [Amps] 3-500ZG brands
At 10:04 PM 8/11/2004, Clay W7CE wrote:
I've just acquired a Kenwood TL-922A which needs a new pair of finals
(one
of the filaments doesn't light up). Does anyone have experience
using
the
Taylor or RF Parts branded 3-500ZG tubes in this amp? Does the
cathode
bias
need to be changed when switching to the 3-500ZG? Any
recommendations
will
be appreciated.
Clay, before you do this, check to be sure that the filament hasn't
simply
opened due to overheating of one of the filament pins. This is a
common
failure because the tube socket springs weaken with age and the
resulting
resistance between the pin and the socket causes local heating. I
have
successfully repaired one that had gone this way with silver solder
that
Rich Measures sold me (cheap), and have another awaiting the same
treatment.
73, Pete N4ZR
The World HF Contest Station Database
was updated on August 2, 2004
2753 contest stations at
www.pvrc.org/WCSD/WCSDsearch.htm
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Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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