[QRZ.com via rec.radio.amateur.moderated Admin]

"Boat Anchor" & Classic Equipment

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Hallicrafters SX-110 factory mod (Mark 1A). Does anyone recognize this?

Posted: 09 Mar 2017 07:47 AM PST
http://forums.qrz.com/index.php?thre...e-this.558338/

This SX-110 just came in from eBay and I was surprised by what looks like a
factory mod. The tube is a 6AK6. Looks like a crystal holder on the side
and a pot on the top. 4 wires come out of the box. Power (switched) and
ground. One goes to the Antenna terminal, and the 4th wire is for the
filament. Does anyone know whazzup with this?





View attachment 354822







View attachment 354825

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Boat Anchor Repair Guy

Posted: 09 Mar 2017 07:01 AM PST
http://forums.qrz.com/index.php?thre...ir-guy.558409/

I believe I was reading this forum and remembering a guy that offered boat
anchor repair (with considerable experience).



I cant seem to find that article now.



Anyone know who is really good at Boat Anchor repair?



Item is Sideband Engineers SB-36 from 1972. Uses FETs, Bi-polar transistors
and 6 vacuum tubes. I have the transceiver documentation and is is mostly
is good/complete.



Thx,



Alan



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R-1051B / URR Variant?

Posted: 09 Mar 2017 04:36 AM PST
http://forums.qrz.com/index.php?thre...ariant.558357/

I have a R-1051B / URR as seen he







The Minuteman missile silo control room seen below is equipped with a radio
that appears very similar, but its definitely not the same radio.



Any idea what it might be?





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Starting an R390 Non-A Rebuild

Posted: 08 Mar 2017 02:22 PM PST
http://forums.qrz.com/index.php?thre...ebuild.492115/

Wondering if perhaps Ive contracted a slight case of Collins Collector
Disease. First signs of it occured this summer when I purchased my first
Grey Box, a broke 30L-1 on eBay. The guy said it had melted tubes and thats
all he knew about it. I took a chance and bought it. Cleaned it out, threw
some tubes and parts at it and got it going. At least it works into the
dummy load. I havent actually used it on the air yet but it just looks so
elegant and cool sitting on the desk....



Starting an R390 Non-A Rebuild

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Kenwood TS-520SE: High Grid Bias and Low Power Output

Posted: 08 Mar 2017 10:25 AM PST
http://forums.qrz.com/index.php?thre...output.555995/

Hi everyone,



Well, my trusty Kenwood TS-520SE decided to start giving me problems.
Essentially, receive is fine but when transmitting CW, the power output is
~ 13W. When tuning up the transmitter, the grid bias will not go below
70mA to the specified 60mA. It will only go 70mA and up when adjusting the
bias control.



I checked the HV (on the TS-520SEs meter) when transmitting CW and its ~
800V. I checked cathode resistors R2 and R3 (out of circuit) on the final
power amplifier board...



Kenwood TS-520SE: High Grid Bias and Low Power Output