This assembly can be taken apart and is fairly easy. The grease in your PBT
is probably all dried-out. You'll need to unsolder the box at the rear,
remove the screws and then pull the slug rack straight back (after removing
the knob on the front, of course). I've had lithium grease recommended as
the replacement - use a modest amount. You'll notice that the round disc at
the back end of the shaft is spring-loaded against the front and has varying
thickness - which is how the slug rack goes in and out. Put a little light
lube on the shaft, too.
The whole thing goes back together easily. Tighten the screws and re-solder
and you're done. Set the knob per the alignment procedure: slugs fully back
should have the knob pointing at 9 o'clock.
73,
Steve Wedge, W1ES/4
To be is to do - Socrates
To do is to be - Plato
Do be do be do. - Sinatra
All my computers have my signature with various pearls of wisdom appended
thereto.
--
From: Neil M Califano cchange...@yahoo.com
Sent: Saturday, October 29, 2011 2:10 AM
To: Drakelist@zerobeat.net
Subject: [Drakelist] Passband tuner hard to turn
The pass band tuner on my R4A grinds a little when I turn it for about 20%
of the 360 degree range. Any idea what is wrong? Typically this happens
after a lot of use.
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