[AMRadio] FS: Homebrew RF Deck, BA Test Gear and Antique Radios

Merz Donald S merz.ds at mellon.com
Fri May 12 09:12:03 EDT 2006

For Sale: Homebrew RF Deck, BA Test Gear and Antique Radios


Homebrew RF Deck. This was made for large push-pull 4-pin triodes, which are missing. A 250Th fits pretty well, but it might have been made for a larger tube like a 450TH, which I can’t test fit because I don’t have any. This RF deck is constructed similar to the Millen rackmount amplifier—but bigger. It has a 19 inch wide rackmount front panel and everything is built on the front panel—there is sheet metal to support the tubes and shield the input circuit. But there is no chassis per se—everything is mounted to the 19 inch rack panel. The centerpiece of the output tank is a huge Bud butterfly capacitor with the attached neutralizing caps (I've seen these made by B&W before, but this is the first Bud version I've run into). On top of this is a Bud HD jackbar with swinging link mechanisim. But there is no link coil and I have none of the plug-in coils for this RF deck.  Below the butterfly cap is a sheet metal box containing the input cap and 5-pin ceramic tube socket (for what—an 807?). The final tube sockets are mounted to the left and right of this aluminum box and the large UTC filament transformer is mounted below it. There is a large RF choke and 2 doorknob caps connected up to the swinging link. Finally, there are 2 Triplett square meters mounted at the bottom of the panel with their connections behind the panel shielded by the aluminum box. This RF deck could be used as-is. But more likely, it is a great parts source. The filament transformer must be 10-15 amps, the tube sockets are the press-fit type (not twist-lock) as used with the 304TL and similar tubes, and the Bud capacitor is a classic boatanchor homebrewer’s cap for large transmitters and amplifiers. No tubes. As-Is. $45


Tecraft Criterion Series Nu-Verter Model 144 VHF Frequency Converter. 4-tube converter uses 2 miniature tubes and 2 nuvistors. With RF Gain and IF Attenuator controls. Two xtals are switch-selectable. Paint in nice shape. All original. With one xtal. Nuvistor tubes have surface rust on them. $22


Daiwa CS-201 2-position coax switch. Heavy-duty switch built for power and built to last. $8


E. F. Johnson 250-20 Low Pass Filter with mounting brackets. Quality unit without the losses found in cheaper LP filters. $10


McMurdo Silver Model 903 Absorption Frequency Meter, brand new in the original box with all 6 coils, also in their original boxes, and the instruction sheet. Covers 3.5-300mc and 400-500mc. The box is opened but this has never been used. $22


RCA Model 150 Test Oscillator. Classic 1930-50’s RCA sweep generator with big red RCA meatball medallion on the panel. Designed specifically for receiver testing, this sweep generator covers 90KC through 32MC in six bands. The sweep width is constantly variable from 1KC through 40KC wide. The modulation switch says “CW—AM—FM” but there is an input for external modulation and I don’t know if it has internal modulation or not. This is the (earlier?) model with black knobs and binding post connectors (the other model (later?) has gray knobs and BNC connectors—but is otherwise identical). One binding post is bent. Dirty but will clean up to be a very nice unit. All original. The leather handle is intact but crumbling. Good paint and good front panel. Untested and very likely not to work without restoration. As-is. $45


Instructograph Model 500 code training machine. The 500 was made in the 1960’s and was a complete update of the machine including solid state oscillator and electrical motor speed control. But it’s basically still just a dopey paper-tape code traing machine. This one has the original manual, original Instructograph order form and a nice collection of 18 different tapes in their original boxes. Some of the tapes take you through lessons in the manual while others are just practice—like No. 23 included here, which is “Mixed letters and numerals in groups of five characters, counting numerals as two, made to conform to practice of the FCC in giving mixed code examinations.” Case has some tears and wear in the leatherette covering but it is excellent inside.  $35


Instructograph original AC model. This is the common unit usually seen at hamfests. It has mechanical speed control and a tube oscillator. Runs on AC power (the original ones were wind-up). Looks good. Untested. As-is. With 7 or 8 tapes and take-up reel. $15


Grebe Synchrophase Seven receiver in cabinet on the Grebe table made just for it. Looks very clean inside. No tubes. Table has opening for a speaker, but there is no speaker. This was a better set so you would have to make a power supply for it. Wood could use some finishing touches, especially on top. But it looks good just as it sits. Untested. As-is. $160


Bulova Model 300 black plastic tabletop AM radio. All-American 5 using miniature tubes. Has phono input on rear. Real sharp rectangular look with gold dial bezel and gold knobs. No cracks or unsightly problems. This should clean up to look brand new. $25


Bulova Model 205 maroon plastic portable "3-way" AM radio -- 4 tube design using 1V and 3V tubes. Runs on 1.5V and 67.5V batteries or 115VAC with line cord provided. This has the same rolled gold look as the black table radio above--very classy. Whoever designed this Bulova radio line knew what they were doing and created an impressive style. No cracks or chips or ugliness. $20


Thanks for looking.

73, Don Merz, N3RHT
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