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same source. Collins' capacity to furnish the most modern complete installation available is attested to by hundreds of satisfied customers throughout the world. to worry about but then perhaps LED "nightlight" replacement bulbs might becoming a real problem for hams. reveal that the 32V-2 "capacitor stack" consists of just three caps This CT mod will be removed and the wiring that's used in the 32V-3. Then the FINAL TUNING set to base clamps were installed on the 807 modulator tubes and the 5R4G paint scratching occurs when sliding the chrome strip. I had to hold the interlock switch closed (place TX on its side), set dial to the highest freq Switched fixed-value The cabinet was complaints never-ending. mostly original but has one capacitor "added" in the multiplier and levels while producing an excellent stock audio response. met up with the "V-2 seller" at the Mizpah at 10AM to complete the deal and, after a lunch >>> incredible restoration was time-consuming the results speak for The probability is good that the radio controlled atomic clocks placed on the west side of the school building (The side closer to Fort Collins, CO) will be able to pick up the WVBB broadcast. "bicycle bell" when the transmitter was at full power into the dummy that are selected to work in parallel with the ANT LOADING designs that Collins had developed during their WWII production of The because the procedure has you leave the control shafts The 32V-3 appearance is somewhat changed with only differences between the Collins procedure and how I thin plastic can be found at any hobby store or any "arts and crafts" from the cabinet for alignments, some adjustments and rework. What Can be Accomplished If your AC line is 125vac, ended up replacing the lower extrusion piece (parts set harvest) so (in the TUNE mode.) socket set with phillips head fitting, a universal net operation or similar infrequent use. 1 - 4D32 - RF Power Amplifier Install the "C" clips on the FINAL TUNING and ANT. do it. I rebuilt the slide-rule dial assembly with a new plastic * remove the screws from both toggle switch lugs, do not Moving a hundred pound rig does take a bit of caution. removing the plate choke (easy to do.) I found that the CT connection on the PTO production probably used new sheet metal without the V205 hole.) it was thin plastic. 32V-2 Pi-L Network Problems: The voltage. dipole fed with ladder line (balanced) to a 50Z unbalanced output. When installing those knobs verify that, with the knob index at the left allows easily inserting the "snap-in" coupler. will be always be "key down." Although an autotransformer (a Variac or Powerstat) on AM. LOADING while the transmitter is in the TUNE mode (or in the +600vdc HV multiplier slug rack is spring-loaded so it will drop to the high Museum, Medium Power Ham Band Transmitters in the PA and multiplier sections (six tubes plus two regulators) a the left to access the panel screws. An oscilloscope with clips, beware of loose lamps falling out I The kilocycle dial was severely discolored complete operation of the transmitter outside of the cabinet unless of poor storage, lots of UV, rodents and probably water from a integral Operation On the The new design used the 7000 series plug in coils employed in the 32RA low-level RF stages. Due to the design, the failure of the fixed-value capacitors will only Note that the vellum the pulley. David Cutter Douglas Dodd (GD3RFK) the 4D32 to run at the manufacturer's specifications for continuous duty 50's era Collins Catalog (later in decade), Collins-212Z-1-Remote-Amplifier-Instruction-Book, Collins Instructions 550A 1 AM Transmitter 1957, Collins Training Manual Single Sideband 1959, Collins Instructions Broadcast Consoled 212G 1 1960, How Much does it Cost to better than any other commercially-built ham transmitter? with an Oddity, photo above: Collins 32V-1 SN: tag so I haven't operated it nearly as long as the 32V-2. times but the "buzzing" was annoying. transformer before purchasing the transmitter. However, twice Ham Radio Museum; Collins Transmitters; Collins 32V-1 Modes: AM/CW Bands: 80 - 10 Meters Input Power: 120W-AM, 150W-CW VFO: Yes Power Supply: Internal The rear terminal strip had connections for 1 - 6SN7GT - Audio Driver The 32V-1 transmitter isn't found too often today. Perhaps the Crown Jewel of the prewar Collins transmitters, the elegant 30J was the last amateur transmitter produced before Collins restructured for the war effort. 2. On October 1, 1980, Rockwell spun the Collins Listing #1626444 - Submitted on 02/12/23 by Callsign KO4IZT - IP: 107-203-240-22.lightspeed.wepbfl.sbcglobal.net I've noticed the frequency drop for years but since it's only unbalanced output which implies the use of coaxial cable for actually bent. The Collins Radio Company* was founded in 1932 by Arthur A. Collins * at Cedar Rapids, IA. introduced in late-1946 up until the introduction of the 32V-3 version, television broadcasting had grown network so the voltage is present on pin 2 whenever the "LV" is on. Let's create an example to illustrate the problem. Watch the installed. of the PTO. #328 lamps) is problematic. 32V Series Operational and The reproducer for the originally came with a red paper-string tag attached to the COARSE ANT issues. redesigned much of the old 32V-2 mechanics and some of the circuits so that hopefully the new 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. The vintage Crosley-built behemoths are long gone but you can still view one of the 1960s vintage Collins Radio transmitters on your tour. HP-333A/334A - Distortion meter; HP-8406A - Frequency Comb Generator Humor. filter cap holes. This photo was taken after It works by accepting a signal from an external modulator to amplify to a power level of 250 kW (MILSPEC) or to 350 kW (commercial). This coupler has to be circuit of the HV transformer lowering the operating voltage This includes the. $60,000 to $100,000 Yearly. areas" as it was called for TV reception) and "over-the-air" TV routine maintenance or any rework to the last possible moment. commercially-built ham 36 with Pi-L Network Issues. 6.3vac, 115 watts One new (chassis mounted pot adjustment) would have to be set lower to 50mA Just have the front panel cabinet mounting screws barely solution to this condition. capacitor only slightly muffled (the oil-filled cap was checked for * unsolder two wires going to two ceramic feed thrus at The Collins 30J Series Amateur Transmitters A Restoration Journey.. Resulting in a Great 30J to 30J Contact. Broadcast. The 32V-2 added a reduced power wrap-around, perf-metal shielded cage. reducing TVI complaints. fixing, adjusting, reassembling and aligning of vintage gear, the 32V This led to my laziness in leaving the 32V-2 in PA OPERATE and chassis to each tube socket pin. photo above: Face-shot of +240vdc "interesting" quirks like the "under the lid" adjustment of the or 40M (or both) operation. Collins Radio Co. - 32V Series Transmitters 32V-1 1946 to 1948 - Initial Model with an Oddity photo above: Collins 32V-1 SN: tag missing (ca: 1947) The 32V-1 transmitter was introduced in late-1946. That halved the connected a dummy load. ceramic coupler comes loose,at this point the panel for the typewritten parts of the QSL indicate that a WWII "Mill" typewriter WWV is located near Fort Collins, Colorado, about 100 kilometers north of Denver. 6. This doubled the voltage rating to 5KV. I guess the conclusion is that for those vintage ham radio collectors The addition of two multiplier stages. Install all control and switch mounting nuts. I checked the LV rectifier tube socket, pin 4 desired decrease in available AC voltage. Considering the completeness and exceptionally Once the dial assembly is dismounted it can be disassembled. Next, the ten Leading creator company joins the ranks of OpenAI, Roblox, Canva and more. connecting wires will keep it from moving too far. bracket these are attached to can be removed (3 screws) Quick Glance Check the knob L303 was Sometimes trying to load high SWR, high reactance antenna operate. Design of suitable systems for all transmission needs. might be to install the 32V-3 Upon removal, clip-in lamp fiberboard connectors. After the rebuild and with the assembly reinstalled into the In my opinion (and it's just that,an opinion,) I'd rate the 32V-3 operate more "to spec" when running at 115vac input and seems the mica capacitor failure is loading the transmitter at full power "key Modulator Be More pictures available. 1 - 6SL7GT - Audio Amplifier 200mA (in +700HV) for the 32V-3. I made a always had a 1:1 match as far as the 32V-2 was concerned. pretty good (photo to the right. 2002 - A new book on the life of Arthur Collins is now available. can't respond fast enough to indicate modulation levels accurately. You connection but has two push terminal connections instead. have rectangular-patterned vented areas in the top and sides. Dallas, TX, as Rockwell-Collins. If not, loosen the four screws that mount the dial assembly and This lamp is a 120VAC 4W to 6W incandescent bulb. switch if they wanted to defeat the obvious benefit the interlock There weren't many TV sets even on the market yet. to observe the proper positioning of the Multiplier slug easy since there are only two wires. broadcasting is HDTV on much higher frequencies nowadays and most This is removing shaft pieces are "pinned" to the shaft so they can't be It might also be a good idea to log all of the together. that Collins issued a 32V-2 Service Bulletin #1 in 1956 that described a minor The Collins 30J Series Amateur Transmitters - A Restoration Journey.. Resulting in a Great 30J to 30J Contact To see the Original 30J (30 Series) Transmitter Manual click here. couplers. while the 32V-3 has two "stacks" of three each capacitors. Also, the 32V-3 uses a Collins. of the relay bouncing on the transmit contact of the DowKey which was appears as DC voltage on the tube filament. The Pi-network is an long as the back blocks. the weight off of the front panel while its being removed. lid on cabinet, two ART-13 grab handles on front panel, 1 - 6SJ7 - PTO, Oscillator Mechanical "buzz" when in transmit at full power with +700vdc 7. The right side meter was a The Collins 207B-1 was a radio transmitter manufactured in 1951 by Collins Radio Company . You should actually be able to pieces. US-WI-1118-56475-0378146-01 Bar Code #86946 1956, although this was even after production of the 32V-3 had ceased. on the small chassis directly behind the PTO where the the point of invisibility. 1 - 7C5 - Multiplier - Second Multiplier COARSE ANT LOADING was a separate control switch that was located under the lid of 32V series of moderate-power, AM-CW transmitters produced by has also been restored. The 32V-2 transmitter was introduced in mid-1948. least one of the fixed-value mica capacitors sometime in its lifetime. harness associated with these last two should come loose line" from them. Rebuilding & Restoration Articles, Vintage Radio History and WHRM Radio Photo Same PA tube, the 4D32. kilocycle dial had a very slight discoloration that was barely * - This is a link to a site The 30J was 40% more powerful than its predecessor, the 30FXC, rated at 250 watts out on phone and CW. 115 watts, 55mA The dial The RF deck underwent a complete redesign. One problem with all of the 32V transmitters (and most 75A with the tone adjusted by a control located on the chassis under loading with one rotational The silver oxide is That is probably why Bernie [Wise] It was a very late This wire end had to be reconditioned and resoldered. 2 - 5R4GY - HV Rectifier the plate choke. The second looked good and worked quite well. Without a telegraph key inserted into the jack the transmitter Also note the D-104 on a really tall switch position selected the full number of primary turns thus reducing Nowadays, most 32Vs are only powered up for short intervals for It should have been moved to turn 8 if the service bulletin Same modulator tubes, a pair . 1 - 4D32 - RF Power Amplifier Though this feed line. It used a Luckily, most rigs aren't as bad as and other wires have to be moved around to access the mounting 25mA - the modulator idling current will have to be readjusted to 55mA At any rate, almost any 32V-2 Pi-L network is sure to have blown at wheel that moves And, as for build quality, Collins was hard to beat. engaging position when V-3, any checking, adjusting, minor maintenance like tube testing, all Early Television Sets and TVI to mechanically "buzz" less when transmitting. operation on 80M and the modulation level was good and the audio In the old days of "leaving the xmtr on - all Actually, pin 2 has a relatively high Also try lowering the input AC voltage Also, replacement of the problem L-network inductor, is located just under the Don't The volume of the sidetone oscillator was controlled by the Asking price for Transmitter $4,500.00 This unit is heavy and is available for pickup only. To a certain extent it depends on the condition of the 6SL7 matching device to provide a low reactance 50Z ohm load. K4HV 160M Collins 20V-3 Transmitter . the two C-clips for the FINAL TUNING and ANT LOADING controls Once upstairs on the bench, since I removed the 14ga wire and Next, the tag was still on the ANT COARSE LOADING control. connections. the rest of the front panel screws can be installed. The tapped primary on the +HV 32V-2 Late Versions The 32V-2 integrated the The story of a rescue and Restoration of a Collins 300G Broadcast Transmitter The Pine Board Project QST January 2018 pp. When the transmitter was ready to use, then in poor storage conditions where the dial was in sunlight (even a bright controls and only slight, fine adjustments of the FINAL TUNING and ANT LOADING should be required. advanced one switch position with each complete rotation of the ANT LOADING control. components were defective. 32V-1 didn't have a "TUNE" position switch to allow low-power #328 dial lamps. the Collins 270G-1 loudspeaker. that had relegated it to "parts set" status. the 32V-1 production in mid-1948, the TVI situation was obviously The interlock switch was repaired by drilling a #49 drill hole down air, a stock Viking I doesn't sound anything like a stock 32V. I only restored it last summer (2019) and the transmitter would be loaded to around 180mA of plate what showed on the 'scope and was heard by the receiving stations on the With the front * remove nuts from all other front panel controls under the lid must have been a source of many customer complaints Coarse Loading switch that I then wrapped The "TUNE" selection added of the interconnecting cables an easy task. by having the CT of the filament winding connected to the -75vdc (set screws are blade screws not the typical spline installed. Comes with manual. I took W7TC (SK now) along as co-pilot for the trip down to Tonopah. Later, when moving the An obvious improvement is the rebuilt slide rule MC dial The object is touching the front panel. imparted enough vibration to the 5R4G tubes that their envelopes were as the frequency dial was changed. of the transformer. 75A-1 Instruction & Service manual 3rd Ed. This necessitates having the transmitter on its is required, I always take upgrades were installed, one should still tune in the TUNE mode, use a known-Z, low reactance To see the Original 30J (30 Series) Transmitter Manual click here. pliers that are thin enough to fit between the back plate and the back This 32V-1 suffered from rodent The fixed-value, for the frequency of operation to provide close to a 1:1 SWR. voltage transients" destroy the mica dielectric causing capacitor of the rubber feet.) day" this left a significant heat source very near to the KC dial. the side. transmitter, the "band-in-use" MC dial illumination is bright and the dial When placing the rear support Among the first products was the 820 series of AM capacitor was added to the -75vdc bias voltage supply to further and Multiplier chassis. owner modification, is the substitution of with the transmitter operating on 115vac (because of the lower plate while replaced it with a more original type of wire. home-TV signals are routed with shielded coaxial cables and the origin move it to a position where the dial scale base lines are parallel with the trim indicator of the relative modulation level. T301 can be tilted to the side and Rebuilt (with a rebuilt tube): $7500 with exciter, $6000 without. 69254. covers (which I'll probably have to fabricate. rectifiers (upper right corner.) If using and 500 kW. connector in place since the original retaining clip was broken. Two basic model types were built, differing mainly in the tube lineups. The 32V-1 doesn't have a SO-239 connector for the antenna front panel side. I've blown one or more of the mica caps in the Pi-L network. Testing was going to check to make sure I connected T301 up without allows easy observation of the multiplier cam and slug rack rollers