Hello Charles,
I suspect the small spring inside the on/off switch cap got hung up after
sitting idle for awhile. I would not recommend a lubricant since it is
switching power.
Drake stocked the on/off switch cap part of the gain control and also the
on/off switch cap for the R-4B. We replaced several of these in the service
department. John Kriner has the R-4B switch caps in his store on ebay, he
thinks the switches are the same. But, I'm not so sure, I know they had
different part numbers, but I never tried using one for the other, as we always
had both parts. If interested in getting a "spare" switch cap, contact John
Kriner, The Man Electronics.
73, Bill wd8dfp
________________________________
From: Charles Ring <[email protected]>
To: [email protected]
Sent: Monday, July 23, 2012 10:23 PM
Subject: [Drakelist] T-4XB power switch
Today I took my two T-4XB's off the shelf after way too long and found that
both of them have trouble with the power switch ganged with the "gain" control.
Nothing happened when i turned them on (yes I used a variac at low voltage and
i will recap the AC-4). Checking with an ohmmeter later I found that both power
switches were open, but repeatedly cycling them brought them back. Is there an
established way to make them reliable?
--
Charles Ring W3NU
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