Hey, Francis -
It's not quite as daunting as it sounds. Only the electrolytic caps need to
be changed, and it's mostly in the interest of preventive maintenance. The
electrolyte in these types of capacitors eventually dries out and the caps
usually start losing capacitance and becoming more like high-value resistors
instead. With most of the circuits, it's not a catastrophic event: one
merely replaces the cap when it fails. In the case of the negative bias
supply in the AC-4, however, it's critical enough to warrant replacing those
two caps (they're actually inside the same can: C5a and b), if nothing else.
There's only one multi-section can on the TR-4 itself (C145), on the right
side at the front, near the PTO. The area underneath it is nice and clear
compared to the receivers.
Short answer is that Hayseed will send you all the electrolytics that will
need to be changed in the TR-4 itself. I haven't worked inside a TR-4 in
years, so will defer to those in the group who have as far as where the
other caps are located. The AC-4 is a separate kit and you have the option
of Hayseed or Heathkit Shop if you don't want to replace them yourself. You
should also definitely recap the AC-4 or at the very least the bias cap
(C5). If you replace the components with modern, non-can parts yourself, be
sure to disconnect the old caps from the circuit.
73,
.Steve Wedge, W1ES/4
Time flies like an arrow; fruit flies like a banana.
All my computers have my signature with various pearls of wisdom appended
thereto.
--
From: Francis Surovec fsuro...@gmail.com
Sent: Wednesday, August 01, 2012 8:45 AM
To: Drakelist@zerobeat.net
Subject: [Drakelist] TR4C recapping
I have been reading various threads and sites concerning the need to
recap these great old rigs. I see at the hayseedhamfest.com site they
have a recap package for the TR4C that is composed of four can
electrolytic capacitors. I have read the to recap this or any of
the older rigs that all of the caps should be replaced. Can someone
point me in the right direction to obtain this information? Thanks.
73,
Francis
WA3GGV
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