[ForSale-Swap] FS: HT-32, OCT-2, LM-13, SP-600, Tektronix, Homebrew Amp

[Don Merz]

For Sale: Boatanchors and Related. All prices plus
shipping.

Hallicrafters HT-32 (not A or B). Classic SSB
transmitter. One of the knobs is broken and the ham’s
call is etched into the metal on the top front center
of the cabinet. The cabinet has the usual scuffs and
scrapes but is basically pretty nice. The front panel
is very good or better. Inside, it’s dirty but there
is no rust or corrosion. Untested. As-is.
Heavy--expect a big shipping cost. $145

Military Navy OCT-2/OCT-3 RTTY demodulator, also known
as CHZ-60170 RF Monitor. This is a 10.5 inch high rack
mount RTTY demodulator with a large meter and many
controls on the front panel. It tunes in 3 bands from
1.0-29MC using a tuning dial from a BC-221 frequency
meter. I bought this at WASHfest back in February of
this year but now I know that I will never have room
for it. Probably weighs 40 pounds. $25

Hammarlund Super Pro SP-600 JX-26. This radio came out
of a smoker’s ham shack. I cleaned off the front panel
but I guess it was not in a cabinet or rack because it
still has a lot of nicotine on the dials and all other
surfaces. It basically looks like it needs a deep
cleaning and the dials are yellowed. Gojo takes the
stuff right off but it will take some time to do the
job right. This radio has been recapped with orange
drops but appears to be otherwise original. There is
no bottom cover. $185

Set of capacitors to recap an SP-600. This is all the
caps in the correct values except the power supply
electrolytics. $20

Military LM 13 Frequency Meter set s/n 1173 in case
CRR 1011 s/n 3183 with meter CRR 74028 s/n 10732 and
CRR 20104 Rectifier Power Unit s/n 2300. The Rectifier
Power Unit has the shock mount, original cable from LM
to power unit and unoriginal AC cable with the
original connector. The black-wrinkle-finished steel
case is made by Bendix with a 12/27/39 contract date.
Meter and power unit made by Bendix  with a 6/21/41
contract date. Very good or excellent cosmetic
condition. Electrically untested and as-is. With
original LM 13 manual with original revision. About
the only thing this set is missing is Canvas bag CMQ
10111 which I do not have. This has one of the
earliest contract dates for an LM that I've ever seen
. 2 Spare tubes are in the lower case compartment of
the case. The rectifier power unit is somewhat rare.
$89

Tektronix 5403 ‘scope system. This ‘scope is
unworking. But it’s certainly worth restoring and I
suspect that some relatively easy power supply work
would set it right. It consists of a 5403 Option 1
mainframe and 3 plug-ins with all original manuals for
the plug-ins and for the mainframe. The plug-ins are
2-5A48 dual-trace vertical amps and one 5B42 delaying
time base. So there are 4 units here--3 plug-ins plus
the mainframe, and 4 manuals--one for each unit. $30
plus shipping for the lot.

N3BM Homebrew amplifier with Ultra-Modulation? At
first glance, this seems like nothing more than a
nicely-made homebrew HF linear amplifier with a
separate power supply. Both units are rack mount, 19
inches wide and 10.5 inches high. The amplifier
chassis uses components that are homebrew
standards--B&W 851 pi-net band switching inductor,
National R-175A plate choke, Millen HV connectors,
etc. But the tubes are missing and the tube sockets
are octals with plate caps. There’s four empty octal
sockets arranged in an L. At the bend of the L sits a
Stancor A-3893 60 watt poly-pedance modulation
transformer. Huh? What’s that doing there? Well,
digging through all of N3BM’s paperwork, I found all
of the documentation on this rig. The data sheet for
the B&W 851 is there, plus several hand-drawn
schematics and a decryption of what all of the many
controls do. The amp is designed for parallel 6146’s
modulated by push-pull 6146’s.  The power supply is a
modified version of two supplies published in GE Ham
News. A copy of the GE Ham News article is in the
documentation showing 816 tubes. N3BM changed those to
5R4’s with paralleled plates. But the documentation
doesn’t have any real meat to it. There’s two other
diagrams, one showing a modification for CW mode and
indicating that the exciter was supposed to be a CE
10-B. Another diagram is entitled “External Wiring
Diagram for Ultra-Modulation” but it is confusing.
There’s also data sheets for the Stancor mod
transformer and for the beefy Kenyon plate transformer
in the power supply.  The whole thing seems way
over-built for 6146’s. I think there must have been
some third component that made the ultra-modulation
happen.  For one thing, the amp has too many HV
connectors on the back--five of them--what’s that all
about? Anyway, bottom line is that I have no room for
this in my shack. I probably would never do anything
with it anyway. You could easily pull out the 6146
sockets and the Stancor mod transformer and replace
them with a pair of 811As or whatever your favorite
amp tube might be. You’d be good to go with very
little effort. Or this thing could be a gold mine of
parts to build another transmitting device you may
have in mind.  Or finally, maybe you are adventurous
and want to make the ultra-modulation scheme work. $80
plus shipping on 85 pounds, probably in 2 cartons.

Thanks for looking.
73, Don Merz, N3RHT