Joe,
You can buy complete re-capping kits for the R-4A (both 13 and 11-tube
versions) from Hayseed Hamfest at the following link:
_http://www.hayseedhamfest.com/_ (http://www.hayseedhamfest.com/)
I just re-capped one of each type using the Hayseed Hamfest kits and
they work great! Garey is correct, the can cap supplied in the kit for
either version is the same, i.e., three (3) 100 uf sections and one (1) 22 uf
section. On some R-4A 13-tube jobs the 22 uf section isn't used, but on
others it is and the extra 22 uf electrolytic in the kit isn't needed. You'll
have to look carefully at how yours is configured and proceed from there,
possibly even tracing the circuit to make sure you know which electrolytics
are used and where. If you have the *ORIGINAL* manual for your radio the
schematic is probably correct, but if you have a copy of the manual there's
a better than even chance that what the schematic shows is not exactly how
the radio is configured.
The only real difficulty with installing the kit is unsoldering and
removing the old can. Since one of the soldered ground lugs is practically
underneath the little transformer you'll have to unbolt the transformer and
move it aside. One of the screws for the transformer is underneath the PTO
assembly but you should be able to see it and get the screw head rotated
so that you can stick a small screwdriver blade into the slot to hold it
while you back off the nut holding the transformer, and later tighten the nut
when you reinstall the transformer.
Then all you need is a big soldering iron or gun and some braid (they
supply some with the re-cap kit) or a good solder-sucker. I used a Weller
200/260 gun and it did OK.
73/arf,
Paul, K4MSG
In a message dated 9/17/2010 12:46:50 P.M. Eastern Daylight Time,
[email protected] writes:
Joe -
Well, the first question is, where do you come up with five caps? The
original R-4A is a three section, 100/100/100 @ 200 VDC. Another
section, 20 @ 200 was added 'officially' in the second version, at s/n
3040. But both three and four sections caps have been found 'in the
wild' in the early version one units.
Tom at www.hayseedhamfest.com has replacements in stock generally that
drop right in. I think he supplies four section caps for all versions.
Adding caps under the chassis works too, just be sure to disconnect the
can cap terminals completely. It can be a little crowded.
Ultimately, it's your radio and your decision! :-)
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-B, C-Line&
TR-4/C Service Supplement CDs
<www.k4oah.com>
Joe Loverti wrote:
> Hi guys,
> I'm working on a early serial number (2213) 13-tube R4A receiver. I'd
> like to restuff the electrolytic can with new capacitors. It looks
> like a very tight fit using (4) 100 x 250V and (1) 20 x 250V new caps
> (total of 5 capacitors) in that old can. How do you feel about
> mounting new caps in underneath the chassis instead of restuffing?
> Does that pretty much ruin the historic value of a radio? Of course,
> I'd leave the old can in place for looks.
> Thanks for you opinions in advance.
> Joe
> WW8X
>
_______________________________________________
Drakelist mailing list
[email protected]
http://mailman.zerobeat.net/mailman/listinfo/drakelist
_______________________________________________
Drakelist mailing list
[email protected]
http://mailman.zerobeat.net/mailman/listinfo/drakelist
