Problem solved. I found that the switch itself was coming apart. The nuts
that hold the ceramic wafers together on the band switch had come loose and
the entire assembly flexed as I rotated the knob. They would have fallen
off completely had I not opened up the box and tightened them.
What a tight fit! You need to remove the plastic shaft coupling to the
phenolic shaft that turns the tuned input band switch. It slides back and
can get lost inside the pressurised final assembly. I barely got it back
out with a small screwdriver...don't know how much profanity I would have
used if I had to remove the tubes and sub-chassis.
The grease on the detent balls had dried out causing above normal rotation
resistance which may have contributed to the flexing and loosening of the
nuts. I regreased the balls and put the cover back on.
So beware.. if your band switch on your Titan 425 gets "wobbly" or exhibits
play. The wafer nuts might be coming loose.
73 de Tom K2TA
----- Original Message -----
From: "Tom A" <althofft@concentric.net>
To: <tentec@contesting.com>
Sent: Monday, March 10, 2003 5:56 PM
Subject: [TenTec] HELP!! Titan 425 Band switch flakey
> I just jumped to 12M to work the VP6 (using 10M band position) and "THUNK"
> the band swich now is acting like...well..no detent. Or an offset detent.
> I need to rock it back and forth between pressure points to center it on
the
> band lable on the front panel in order to get output.
>
> I'm not familiar with the switch assembly (I have yet to open the amp
> up)...but it "feels" like there might be a rear ball detent and a front
ball
> detent and the front one is missing...but that may not be what is going
on.
>
> Is there anyone familiar with the bandswitch construction on the 425
Titan?
>
> Tom K2TA
>
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