[Hallicrafters] SX-73 / R-274 Starting Resto

[thoyer]

The ones in my SP-600 were the potted style. 

I think I'm going to just use terminal strips for the new caps in the R-274.

One odd thing I found last night was that there was a 5w 3.3 ohm resistor
installed in location R105. BOM calls for a 2W resistor in that location.

Doing the math the heater current is approx 600mA which would equate to
approx 1.1W of dissipation. Maybe they ran out of two watt resistors when
building?

Tom
W3TA 

-----Original Message-----
From: hallicrafters-bounces at mailman.qth.net
[mailto:hallicrafters-bounces at mailman.qth.net] On Behalf Of Richard Knoppow
Sent: Tuesday, January 09, 2018 5:58 PM
To: hallicrafters at mailman.qth.net
Subject: Re: [Hallicrafters] SX-73 / R-274 Starting Resto

   I started writing a long piece about the SP-600 caps none of which may be
applicable to the Hallicrafters SX-73/R-274, which may have different caps
than the SP-600. Its possible it has oil filled bathtub paper caps, which
the SP-600 does not have.  I agree with the previous poster that its a waste
of time and effort to try to restuff them. 
Mounting on terminal strips works fine.
     I had to replace a bunch of oil-filled bathtub paper caps in an RCA
AR-88. All had leaked oil from the terminals. This receiver had  bottom
cover (rack mount type) so the oil was mostly collected there. I washed it
out carefully. I mounted new plastic caps on terminal strips and disposed of
the old ones.
     I think all the bathtub caps in the SP-600 are electrolytic types. 
The ones I opened up were potted in resin, no oil. Again, not worth the
bother to try restuffing. I am more interested in performance than authentic
underchassis appearance.
     I don't have direct experience with the SX-73 but they are reputed to
have excellent performance when working right so should be worth the effort
of restoring properly.

--
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL
______________________________________________________________
Hallicrafters mailing list
Home: http://mailman.qth.net/mailman/listinfo/hallicrafters
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Hallicrafters at mailman.qth.net

List Administrator: Duane Fischer, W8DBF
** For Assistance: dfischer at usol.com **


This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html