The items listed below are surplus to my needs and I would like to find a new home for them. Some would be free and the rest very cheap.
I am not a seller of electronics parts and do not engage in this type of commercial activity. I just have things acquired over the years, which I want to be rid of.
I do not want to mail the heavy iron stuff so pickup in Chapel Hill NC is the only alternative.
Contact me if you are interested in any item: fbw4npn@gmail.com
Collins T-195 PTO. This is the heart of a very stable VFO and usually sells for about $99 on eBay. It works properly and you can have it for $20; pickup in Chapel Hill or pay the mailing cost. Here’s a photo.
Transformer: 2350-0-2350 volts, 500ma. Manufactured by Freed for CCS service. Used, quite old, but shows no signs of overload or abuse. This, plus the 2500V filter caps and 400 ma choke listed below would make a great high voltage power supply for a home built Linear Amp. It is big. $5
Oil filled filter capacitors, all clean, no rust, as follows:
2 each: 10mfd @ 2500v. Good condition. $3 each
Filter Chokes:
Filter Choke 400ma, 3,000 volt. It’s big, too. $3
Filter Choke 6Hy, 30ma, potted, nice. $2
Filter Choke 6Hy, 90ma, potted, nice. $2
Filter Choke 10Hy, 150ma, potted, nice (three each). $4
Transformers – these are high quality potted units that are built for Constant Commercial Service (CCS) (see descriptions below):
T1: Two 115 VAC primaries (so you can use either 115V or 230V), Secondary windings are 5V-2A; 6.3V-4A; 6.3V-0.6A; 6.3V-0.6A (again) and 570-0-570V-150ma. This would easily power a 6146B, 807, etc.
T2: 115 VAC primary, Secondary windings are 5V-2A; 6.3V-2.5A; 6.3V-4A; 6.3V-0.6A; 540-0-540V-150ma.
T3: 115 VAC primary, Secondary windings are 24V-500ma; 5V-2A; 6.3V-3A; 5V-2A; 6.3V-4A; 6.3V-2A; 6.3V-1.5A.
T4: 115 VAC primary, Secondary windings are 5V-2A; 850-0-850-50ma; 577-0-77V-50ma.
T5: 115 VAC primary, Secondary windings are 5V-2A; 850-0-850V-30ma; 577-0-577V-0.5A.
Misc Xfmrs: Several removed from UPS units; 12 VAC primaries, 120 VAC secondaries. Run them backwards with up to 20 VAC on the 12 volt winding to get up to 200 VAC from the primary.
With a capacitor input filter system a 280 volt DC, or using a voltage doubler, a 560 volt DC system can be built. These are 450 or 750 or 1000 watt units so you can safely derate them a bit and have fun powering a home-built xmtr.
Or you can put 120 VAC on the 120 volt winding and will actually get about 14 VAC on the low volt winding. Using a LDO regulator, you can make a nice 0-12 volt variable supply for your workbench or to power a small solid state xmtr.
Misc Xfmrs: Several microwave transformers: about 2100 volt secondaries (use for an 813 linear amp?). Removed from 1000 – 1200 watt microwaves. Or remove and rewind the secondary with about 16 turns of #14 stranded house wire for a nice 13.5 volt linear power supply. These provide about 1 volt per turn so you can create any secondary voltage you want.
I’ve been using one rewound with a #14 house wire secondary for my 13.5 VDC Yaesu power supply using a variable voltage regulator circuit and several pass transistors, for many years. It was removed from a 1000 watt microwave and never gets hot.
Even simpler: Feed 120 VAC into the secondary of a MOT and get about 7 volts from the very heavy-wired (10 amps x 120VAC typical) primary. Use a voltage doubler rectifier circuit to increase the 7 volts to about 18-19 volts. With a simple voltage regulator system, this can easily be dropped to 13.5 volts. The transformer is probably rated for 1000 watts so it will run cool and not saturate if it powers typical ham gear.
One of these available MOTs actually has a 950 volt secondary which could be used for a 6146B/807/similar amplifier.
Or if you feed 120 VAC into the secondary of the 950 volt transformer, about 15 volts will appear on the heavy-duty primary. Rectify and regulate this!
Misc Xfmrs: A couple of VERY high amp low voltage xfmrs; we’d have to check these, I think I remember that at least one is good for a 50+ volt supply for a mosfet amplifier. Or whatever you need.
Misc Xfmrs: Lots of low and medium voltage units – what do you need?
Quite a few tubes; used but good:
Voltage regulator tubes, all voltages
Many rectifiers; 5U4, 5Y3, 5R4, six volt tubes, etc
Lots of audio tubes – 12A*7 family,
6U8’s, 6AL5’s, 6AU6, 6AH5, many others.
Some NOS 807’s
I have a spare NOS 813 – give me $15 for this. Power it with a microwave transformer, drive it with a 6AG7, 6CL6 or 12BY7 and build a single or dual band 500W xmtr or linear for almost pennies, or make it stand alone as a grounded grid amp, without a lot of switches, coils, etc.; just wind a couple of coils with #12 house wire or use a T200-2 toroid, for the band(s) you want. Want a band switch? I have that too, just for you.
If it is to be a single band 500W unit, use a toroid for the tank coil and a fixed cap for the tuning cap. A variable cap will be needed only for the tank’s output cap. Low parts count and cheap!
Bathtub capacitors (a.k.a. “condensors”):
Lots of these in good condition – what do you need?
Free in reasonable quantities.