Thanks Barry.
That link was really useful. It looks like the #1 amp in question is the third
production variant described on the ref link. Owner says the nameplate
specifies Model 425, s/n 91A10160. The #2 amp looks to be the first production
variant described on the link. Owner says the nameplate specifies Model 283,
s/n 00323 (although the front panel is marked TITAN 425).
The #1 (third production variant) amp is kaput. According to the owner, it
suffered catastrophic failure......burned HV components (resistor) and wire in
the RF deck, including the plate choke. This amp's bandswitch does not have
"10"m marked on the front panel, but the bandswitch can be rotated to that
unmarked position (for what that's worth).
The #2 (first production variant) amp is allegedly healthy, and does have the
panel-marked 10m position for the bandswitch.
Owner has one power supply that was originally paired with the #2 amp. Hope
it's compatible with the #1 amp.
I'll get an opportunity to personally inspect the amps this weekend. Sounds
like the #1 amp is a project amp, but it wouldn't be the first "project" radio
I ever bought.
Allen---W7GIF
----- Original Message -----
From: Barry N1EU<mailto:barry.n1eu@gmail.com>
To: Discussion of Ten-Tec Equipment<mailto:tentec@contesting.com>
Sent: Wednesday, July 09, 2014 5:05 PM
Subject: Re: [TenTec] Titan 425 front panel treatments/schemes
Titan color and vintage described at
http://www.tentecwiki.org/doku.php?id=425versions<http://www.tentecwiki.org/doku.php?id=425versions>
Barry N1EU
On Wed, Jul 9, 2014 at 9:06 PM, A R <raf_3@msn.com<mailto:raf_3@msn.com>>
wrote:
> I've run across two 425's, each with different front panel color schemes
> and knob styles.
>
> #1 has a light colored front panel (about the same as a Corsair II),
> fine-serrated tune and load knobs, and no 10m legend marked on the panel.
> Front panel is marked "TITAN" (no 425) under the TT insignia.
>
> #2 has a dark colored front panel (about the same as a Corsair (not II)),
> finger-size flutes on the tune and load knobs, and 10m legend marked on the
> panel. Front panel is marked "TITAN 425" under the TT insignia.
>
> Don't yet know the serial numbers of either amp, but just based on the
> color schemes and knob styles, I presume the #1 amp is the later
> production, and the #2 an earlier production amp.
>
> Is it possible to ascertain the production vintage just by virtue of the
> color scheme and knob style, or does one really need the nameplate data
> (like s/n)? Any meaningful changes during the production run to correct
> reliability issues on early units?
>
> Thanks....
> Allen---W7GIF
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>
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