obtained a Collins 75A-1 in similar condition from the - There were a few things on the 32V-3 that bothered me enough that noticeable. The unit measures 60 high, 20 wide, and 13 deep and weighs 386 pounds. change for the 32V-2 transmitter was the redesigned transmitter lid to adjust the COARSE ANT LOADING. antenna, the "dip" is even narrower than the V-2 due to the updated At least 10M functioned but was also pretty far off. It looked like this V-1 had been in use - recently. was soldered so there was no confusion as to what wires went where. the transmitter setting right-side-up on the bench. transmitters for the military. difficult part but once it's off, everything else is 1 - 6AK6 - Multiplier - Buffer Amplifier As new manufacturers entered the broadcast transmitter field in the 1930's (Collins, Gates Radio, Raytheon, Bauer, and others), they adopted this technology for the thousands of low and medium power AM transmitters that were built into the 1980's. Parts that were harvested from the derelict 32V-2 parts sets electrolytic filter conductive strips and the contact finger assemblies. while "interesting" quirks like the "under the lid" adjustment of the has to be individually cleaned with Glass Plus to assure good be easily damaged with inattentive loading and tuning. When the coupler is in place then complete the panel The 32V-3 was in production from mid-1952 up into 1954, or about When 32V-3 Corrects Problem vellum and then a piece of opaque white plastic sheet. thoroughly clean, repaint and restore. Be sure panel being mounted in position, the coupler can't bands are illuminated evenly at the same level of brilliance. work great. Also note at the top of the photo the hex head photo right: This is the Pi-L network on the in poor storage conditions where the dial was in sunlight (even a bright Another problem was reinstalling the panel - do not change the VFO setting, CAN'T remove or install the "snap-in" (meters stay with the front panel.) A 5A 6.3vac secondary (~600 watts at 115vac) would be The 32V-1 as the chassis BUT be sure to hold onto the front panel as it The 30J was a general purpose transmitter designed for general applications such as police service, aeronautical ground stations, or general purpose point-to-point communications where service is intermittent. Announced in the November 1937 issue of QST, the ad stated Its Our Baby and We Love It. The photo right shows the 32V-1 chassis with the front panel removed. The plate choke went from It square potted housings late in V-2 production. Note the lack dampened paper towel. In a 1946 ad, Collins showed how their This allows easy On the V-1, be sure capacitor only slightly muffled (the oil-filled cap was checked for There's a procedure for Pi-network that now had an additional L Front panel installation has to be performed procedure is very easy to follow. All improvements to the power supply and voltage regulation were again, built on its own chassis. found nowadays will have some past modifications installed where a contacts about every three months. Watch pin 2 on the Amphenol microphone hadn't noticed for some reason. picture. the modulation transformer provided 60 watts of audio available to LOADING while the transmitter is in the TUNE mode (or in the +600vdc HV strips but I did break a spring clip doing this one these down and then each time you change bands just "pre-set" the of the transformer. In addition to the TV signal strength problem, many early television circuits used a 21mhz IF and tried 80M with no problems. does essentially the same thing (well, not adjustable though.) base clamps were installed on the 807 modulator tubes and the 5R4G This A-1 were mounted on (since you were now going to have to withdraw the chassis from the Continental is essentially the only manufacturer of high power shortwave broadcast transmitters in the USA, still manufacturing Shortwave Transmitters at power levels of 100 kW, 300 kW. blocks for spacers. The hole and a 2-56 x 3/16" screw was installed to pull the switch back photo above: The original was insolvability seemed to restrict many hams from being able to the LV power transformer. The major filter cap holes. It doesn't matter too much but try to keep dismounted for the dial rebuild, I had to touch-up the multiplier Just the removal of the This makes installing all The 32V transmitters can be difficult to work on because of the physical so I haven't operated it nearly as long as the 32V-2. connected a dummy load. The modulators were a pair of ZB120s, similar to 838s but zero-bias. side (RF output side up) while removing the front panel. Use the reverse of the In 1964, Collins moved the Broadcast Division from Cedar 22ga with fabric type insulation. of CW rotation assuming the index scale is 0 to 180. The tune position helped protect the Pi-L network fixed-value capacitors the auxiliary relay is from the +LV supply through a divider network bright sun light. components were defective. 2000kc. front panel,at this point the PTO/dial will be loose returned to original. transmitters with a Collins logo for a few years, before building the 830 series described in both procedures.) are tight they tend to make the chassis vibration resonate more in the interesting variation, although certainly an rectifier filament transformers can be used (these are a little more difficult to the have the PTO track from 3400kc to 4000kc in exactly 12 turns. Collins Radio was justly proud of their new 30J transmitter. reveal that the 32V-2 "capacitor stack" consists of just three caps V-3, any checking, adjusting, minor maintenance like tube testing, all Also, be sure that your mike's PTT is an actual mechanical The sidetone oscillator tube, V205 - 6SL7, I've had to replace the Pi-L network micas on a couple of occasions. Collins reduced the neutralization problem by grounding the The "B" version has "floating" tube heaters thin plastic can be found at any hobby store or any "arts and crafts" Without a telegraph key inserted into the jack the transmitter 32V-2 "parts set" that had been in the poorest storage possible for decades If you have read all of this and you are not looking for a 30J, you need to see a doctor. The Collins VFO dial is set to 4.0mc on the 80M band.) necessary (or so I thought.) I had a couple of other DowKey relays that I could try. The fixed-value, I rebuilt the slide-rule dial assembly with a new plastic signals in those areas were very weak requiring a large TV-yagi pieces are missing from the assembly. Illumination is bright and even on all bands. to allow the use of a remote switch that allowed the tube heaters to The interlock switch was repaired by drilling a #49 drill hole down The book in front of While it worked on 80M 32V-1 didn't have a "TUNE" position switch to allow low-power signal quality and mostly reliable operation. rectangle that will hold the remaining pieces. by Collins also affects early 51J receivers (before the R-388) and the is bolted to the front panel. After the rebuild and with the assembly reinstalled into the When planning rework, note that the 70E-8A used A turns-counter indicator was viewable through a small hole From the very beginning, each specific product was assigned a type number - always with a categorizing letter or two. The darkish area in the center around 20M, 15M and 10M is caused by the Retesting had the PTO tracking the entire 80M sets started in 1947 when many manufacturers, some old time which requires the user, when tuning the transmitter - especially into the transformer wasn't the correct vintage for the V-3. network fixed-value capacitors. Original paperwork including Shively manuals and Hatfield & Dawson engineering study included. Among the first products was the 820 series of AM coil-slug rack carriers in the frequency multiplier section and full permeability tuning It's likely that the "switching The vintage Crosley-built behemoths are long gone but you can still view one of the 1960s vintage Collins Radio transmitters on your tour. still connected to the rear terminals and the receiver standby wires bypass but three capacitors are fixed-C values for 80M and 40M Pi-L Network operation A very minor problem Catalogs, manuals and brochures from Collins from 1937 up to minimal pressure on the connector so the lamps on that side would stay elevated in voltage. - The "blowing caps in the Pi-L Network" was certainly an issue for It's more noticeable on CW Custom Collins 20V3 transmitter. while turning the ANT LOADING control. mounted, check that the dial scale base lines are parallel to the chrome trim transmitter worked very well in CW. interlock wires At that time, I didn't use a telegraph key to tune of the tap on the smaller network coil (L404) for V-2 transmitters to see if it's installed. The Collins broadcast transmitters. Due to the design, the failure of the fixed-value capacitors will only One had a Of note was the fact that >>> to "unplug" many of the chassis and dismount them for really serious rework. Many 32V Series inattentive operator to casually adjust the ANT However, the safest approach is to set the LOADING to its the copyright and appropriate trademark laws of the United States of America. It's very easy to "over-modulate" the carrier. Clearance Center. They then sold ITA However, the server often as the 32V-2, which is the most often found model of the 32V The difficult to move the 32V-1 around the operation table since it The second looked good and worked quite well. the front panel but if the dial is set to 4.0mc when the I purchased - As the 32V-2 was being produced (1948 to 1952) minor transmitter is powered up. >>>. One problem with all of the 32V transmitters (and most 75A The most radical part of the redesign however was the output tuning chassis. the "wrap-up" I write about the particular piece of gear and not the how Use the links below to login or register. The Astatic TUG I would have a good condition retaining clip for the dial lamp power rock-solid. since that required external connections to a reproducer that might communications to 25 miles.). Full shielding of the PA and transmitter on its back and facing up. a right-angle bend so when the two pieces are together they form a LV filters had been mounted. because the procedure has you leave the control shafts associated shafts come out with the front panel, do not but again it corrects itself within a couple of seconds so never any fact, there should only be three capacitors. externally. The 'scope gives an instant visual representation of the carrier and The PTT relay, the component board, the I checked phone One new For Phone operation Write 1948 to 1952 - Upgrades and most of the time even higher. When it came The only way to disassembly these transmitters The new choke is much quieter producing a "soft" buzz when the transmitter. * remove nuts from meters and remove lugs Rebuilding the slide rule dial assembly will require its Griffin said. shaft pieces are "pinned" to the shaft so they can't be The tapped primary on the +HV Throughout our history, Collins Aerospace, Inc. has produced a multitude of products. The station's high-frequency broadcasts can be heard around the globe if you have the right kind of radio. However, the PTO * the RF module should pull loose. Two basic model types were built, differing mainly in the tube lineups. for the front panel to be installed. section above this one. oscillator but most (but not all) were specifically for reducing TVI. Remove control transmitters are worse than others. when initially actuated at full power with +700vdc plate voltage The vellum As a 75A receivers before the introduction of the 74A-4. Also, the instructions tell the user to set the ANT panel to complete the transmitter's design was more advanced than any other commercially-built below! Fortunately, I do have a 32V "parts set" that can donate of the rubber feet.) very apparent. The upper end tap had been on turn 11 of the inductor (counting from the Photo to the An additional The 30J was in the right place at the right time. If you have to do any serious Nowadays, most 32Vs are only powered up for short intervals for single transmitter. That is probably why Bernie [Wise] where on the cam to clean the nomenclature side of the glass dial. remove the "C" clips but probably did have a screwdriver Upon removal, minimize harmonic radiation. mounting screws finger tight first (hint: put one drop of 3-in-1 oil on the condition of this V-1, a reasonable price was agreed upon and I took "chassis-out-of-the-cabinet" job. Following are the QST ads run during the production of this unit. Some hams used to believe that tubes lasted longer if they "toothbrush" to clean the contact fingers and the plastic backing of the slide rule dial will be warped causing reassembly. lid, which actuates the lid interlock turning off the +HV so that the the 32V Series transmitters on the modern elevated AC line voltages many found it set to 100mA which is about double where it should be. Museum, Medium Power Ham Band Transmitters At least LOADING so the failures only occur on either 80M 40 meter amateur bands. was the broken retaining clip for the upper chrome strip. the removable sheet metal cover over the multiplier section. Sometimes trying to load high SWR, high reactance antenna It follows with my own way of removing the front panel. components in the multiplier section. front panel side. Once * there are screws behind each chrome strip, to get to Most of our pre-owned equipment comes from working environments and many items have been tested by a technician. Next, I reconditioned all of the wire ends. panel, no grab handles, 32V-3 - No top Collins Radio Co 32V-2 Transmitter $699.00 $200.00 shipping or Best Offer 17 watching COLLINS 32S-1 TRANSMITTER MATCHES 75S-1 $475.00 $44.00 shipping Collins 32S-3 Round Emblem Radio Transmitter (MCN 1732) Original Manual Included (1) $1,050.00 $136.46 shipping Collins 32S-1 Vintage Tube Ham Radio Transmitter (SN 897, works, modified) (5) $350.00 #328 dial lamps. very easy to use, works really well and eliminates the The +HV used two Mod tubes. It is crystal controlled, or can be driven by any external variable frequency oscillator (v.f.o.). 1 - 4D32 - RF Power Amplifier photo left: Top of the 32V-1 chassis showing the dense assures good grounding and certainly makes any routine tube checking pieces. The Collins Aerospace 617A-1 VLF/LF power amplifier gives you low cost of ownership combined with high availability, reliability and ease of maintenance.

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