Evidently I didn't send my reply to the list.
1, I have used the Heathkit Shop rebuild kit with success
and have to AC4s with them. Not hard to install.
2, I do not have the Hayseed Hamfest kit but have bought
lots of other capacitors from Tom and am very satisfied.
3, I mentioned a third kit but couldn't remember details.
Its at:
http://harbachelectronics.com/product-category/drake/
I have no experience with this but its gotten good
reviews on the Drake lists. Also Harbach is a reputable
firm.
I will reiterate the warning about the bias supply. If
it fails the tubes burn up. They have become quite
expensive.
--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com
----- Original Message -----
From: <choward...@aol.com>
To: <drakelist@zerobeat.net>
Sent: Thursday, May 29, 2014 6:36 PM
Subject: [Drakelist] TR-4 Audio Hum Question
Thanks to Gary and John for their response to my audio
hum question. I
plan to accomplish the easy one first; cleaning the pins
on the AC-4 power
plug.
If that does not work, I will go to #2: re-cap the power
supply. In fact,
I may that in any case. But, I would like some advice. I
am 74 years old
and the only real electronic work I have done was to build
a Viking
Adventurer transmitter when I was 14. It worked the first
time.
I have found 2 different products for the AC-4.
The first is from "Hayseed Hamfest". It is a kit that
replaces all five
electrolytic capacitors with new ones. It is $72.00.
The second is from "The Heathkit Shop". The Drake AC-4R
kit includes a
new PCB that replaces the old Caps and diodes. Only the
transformer and the
bias adjusting pot from the old power supply are used. It
also requires a
voltmeter capable of 1000 volts to be used in the testing.
My question is to anyone who has knowledge of these
products and which
they recommend for someone with limited electronic skills.
As usual, Thanks for any help you folks can provide. You
have helped in a
couple of previous situations, which turned out just as
you suggested.
Howard - N0KOE
--------------------------------------------------------------------------------
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