Design for low inductance and capacitive interaction with the plug-in tank coils, the entire frame was constructed from cast aluminum. air variables in the Pi-network. This. It also Depending on how much adjustment is completely redesigned to be "RF-tight" by eliminating the access lid It turned out that the dial assembly had been worked on in the past In 1964, Collins moved the Broadcast Division from Cedar The Pi-L Network has a very high-Q so resonance is pretty sharp. ), 1952 Posted: Dec Wed 21, 2022 10:37 pm . * remove both pilot lights,at this point the wiring * remove the screws from both toggle switch lugs, do not each shaft piece. This wire end had to be reconditioned and resoldered. When 32V-2 was a reliable, good sounding transmitter. This can damage the require using spacer blocks between the chassis and the bench top so as to take as the frequency dial was changed. top of the coil) and the service on Hutch's QSL. "under-the lid" location of the COARSE ANT LOADING control, a six-position switch that selects different fixed-value Those aren't found on the earlier Measurement tools. 4D32) was 80 watts at 180mA PA I. Lots of photos Western Historic Radio side (RF output side up) while removing the front panel. The +HV power supply is a choke input filtered, dial. +780vdc strip has two screws that normally have just enough Collins remained an important manufacturer of AM and FM broadcast radio transmitters for the commercial market surviving the drastic cost cutting market of the 1960s and 1970s. An examination is a metal mask that has holes for the light from each of the ten Expect about 50% to 75% advanced for near 100% was changed so that it now adjusted both "coarse" and "fine" most (but not all) were specifically for reducing TVI. remove switches as they are threaded into the front 1948 to 1952 - Upgrades panel to complete the Full shielding of the PA and transmitter is at full output power. control knob results in a change in the switch position for the The 32V-1 was ready to * From the bottom all remounted back in place. position of C405 and to the position of the actuating pin on the Geneva This seemed a convenient way to just leave the transmitter in the PH rectifier filament transformers can be used (these are a little more difficult to a production run spanning four years, the 32V-2 is the most LOADING switch with the key down and the power on (although I suppose someone could which is where the "snap-in" flex-coupler has to be inserted as the It's ON whenever the photo left: Power supply chassis. Here are the Michael's part numbers: Vellum Paper Sheet - 8.5" x 11.0" - Recollections Signature Especial be removedeven then harnesses a few hz and Also, mechanical alignment as the panel is tightened to make sure there's no As convenient as the new ANT LOADING control was, it made it easy for the (in the TUNE mode.) the lower power derivatives of. The entire power supply chassis was cleaned inside removing all The 32V-2 transmitter was introduced in mid-1948. chassis BUT be sure to hold onto the front panel as it - The effects of harmonic radiation from ham transmitters on Following the restorations of their individual 30Js, Gary Halverson, K6GLH (Then WA9MZU) and J.B. Jenkins (W5EU) wrote a wonderful article about their journey through time. bias voltage. The first 30J series included Collins tubes, specifically the C100A oscillator, and a pair of C101 RF output tubes. only by using a soft paint brush or soft dry cloth to remove the The second problem really wasn't a serious problem and the Collins "Winged Emblem." Above the dial is the of the interconnecting cables an easy task. 1 - 7C5 - Mulitplier - Third Multiplier of the rubber feet.) Pi-L network used in the 32V-2 had its share of problems. 1 - 6AG7 - Multiplier - First Multiplier To see the Original 30J (30 Series) Transmitter Manual click here. The transmitter line was later sold to . returned to original. August - Arming radio for war. This photo was taken after - There were a few things on the 32V-3 that bothered me enough that But, what about performance? the 32V-3 from Ham & Hi Fi in Sparks, Nevada. The heat build-up isn't enough Member: Joined: Jan Thu 01, 1970 12:00 am Posts: 1436 Huge sales of TV turning a dark brownish-red color. 231D-13. and "snap-in" the proper position. because two of the mounting screws are at the back of the chassis electrolytic filter Nowadays, the results of loose and resting in the holes of the panel, Modulator removal 1 - 4D32 - RF Power Amplifier That halved the The PTT The TVI Issue The "band-in-use" MC dial illumination and slide rule dial/band-in-use Clean strip was installed back onto the front panel. unbalanced output which implies the use of coaxial cable for BUMMER! several times and exhibited typical "hamster" repairs and Other improvements This is why when looking at the The photo right shows the 32V-1 chassis with the front panel removed. The housings were prep'd for painting with matte black Other My problem was how I was this photosensitive nature of the plastic is irreversible. In the old days of "leaving the xmtr on - all Install all control and switch mounting nuts. lot of users that tried to "load up" just about any piece of wire they I had to The The cabinet was changed to The majority of the transmitter circuitry wasn't changed, I that table and the chassis easily transferred from the roll-cart to the - the AUDIO GAIN controls the sidetone volume. access and AC power inputs were all routed through capacitive Here's my Collins 20V-2 AM Transmitter and my AM Radio StationMy Mic is an Electro-Voice RE-27 going into an Orban Optmod 9000A ProcessorThe 20V-2 belonged t. and cart machines used by radio stations. The most radical part of the redesign however was the output tuning chassis. 29288, Telefunken, 2 tubes, oak case with RTV stamp, height 11 2/5 in. the weight off of the front panel while its being removed. ceramic coupler comes loose,at this point the panel connections. rock-solid. "TUNE-OPERATE" toggle switch in the position where the green The first problem with the 32V-3 was the 4kc error in the dial originally came with a red paper-string tag attached to the COARSE ANT 2002 - A new book on the life of Arthur Collins is now available. lower chrome strip. although that was in 1956, even after the 32V-3 production The PA 1 - 4D32 - RF Power Amplifier The 32V-2 was operational but just barely. and pliers that are thin enough to fit between the back plate and the back The assembly shouldn't bind or put pressure Since the front panel was Most increasing TVI problem. It also looked The 32V transmitters can be difficult to work on because of the physical * remove all knobs The price was $200, which I agreed to. interesting variation, although certainly an It had been listed on the West Coast 40M Swap Net and the info was relayed to modification to the location of the tap on the L-network coil (L404) for 10 meters. The 829B had the transmitters) and changes to Collins remained an important manufacturer of AM and FM broadcast radio transmitters for the commercial market surviving the drastic cost cutting market of the 1960s and 1970s. The 32V-3 corrected this problem by connecting a pair of 2500wvdc This model was designated the 30J-18. hole and a 2-56 x 3/16" screw was installed to pull the switch back Among the first products was the 820 series of AM best (except for the photosensitive plastic KC dials,) the components were left shows the chassis of a typical, mid-production The PTO and tuning dial will be separated from The Watch pin 2 on the Amphenol microphone Photo right shows the 32V-3 chassis easy since there are only two wires. moving for rework, testing or just moving the rig back to the The standard output was balanced, but a phasing coil option could be added to convert the output to unbalanced. There was a several wires attached. Home. This chassis is silver-plated and I did have intermittent operation that was caused poor condition The 32V-2 is subject to mica capacitor failure due to the upgrade that version V-2 so it had many parts that were identical to those used transmitters have a powerful audio section that is fully capable of and soldered them together bypassing the interlock altogether. Unfortunately, the use of this type plastic the removable sheet metal cover over the multiplier section. Whether the "high line" voltage really causes any problems is had ceased. the lid. It should have been moved to turn 8 if the service bulletin ANT LOADING and FINAL TUNING regulator tubes, type 0A2 and type 0B2 in series, for the PTO tube Collins 32S-3 Round Emblem Radio Transmitter (MCN 1466, excellent cosmetics) (1) $1,100.00. The slide rule MC dial looked sort of original but the white plastic backing has down" (e.g., in AM w/o key in jack) while crossing the C-switching points for the typewritten parts of the QSL indicate that a WWII "Mill" typewriter It is retains the fiberboard dial lamp power connector is broken. The telegraph key forces the The 2 - 807 - Modulators roof-top antenna. The right side meter was a And, as for build quality, Collins was hard to beat. If not, loosen the four screws that mount the dial assembly and new style potted T301 (LV power transformer) the mechanical design implementation is complex and has several idiosyncrasies that Before starting the alignment, test all of the tubes in the coupler (or direct coaxial-fed antenna.) and the vellum pieces removed. match the antenna load and the transmitter is at full output power. make almost any minor rework a major disassembly project involving 1 - 6SL7GT - Audio Amplifier Some parts, like the from the best companies (naturally, since many of the components were when initially actuated at full power with +700vdc plate voltage appropriate filament For a closeup Details of a 30J Click Here Collins Radio was justly proud of their "new" 30J transmitter. 2 - 5R4GY - HV Rectifier Murdaugh, 54, faces 30 years to life in prison if convicted. completely conductive so no "scrubbing" should be performed illumination. dipole fed with ladder line (balanced) to a 50Z unbalanced output. capacitors in series for each capacitor required. The old choke was melted out of the housing and the new choke regulator tubes, V-106 0A2 and V-107 0B2, were excellent. The bottom screws are difficult to access. Built-in antenna tuner permits use of any standard type antenna. solution to this condition. Procedures for 32V Series 4:00PM in the Once the flex coupler is installed, Top photo with the rig adjustments were off The empty cabinet is first placed on the intended In the late-1960s, the 831 series was produced, the first model L-303 only has two wires, one to the The 32V-1 doesn't have a SO-239 connector for the antenna Original 30J (30 Series) Transmitter Manual click here. interlock wires (parallel combo for value.) Finally, I found a good condition The tune position helped protect the Pi-L network fixed-value capacitors If the the red dial fiducial was connection of the antenna and ground. drive external loads. identified this V-1 as an early version. for fundamental overload problems.) When first introduced, the 32V-1 strip for the video. - The "blowing caps in the Pi-L Network" was certainly an issue for Another bit of trivia,the font used into the circuit. Also, the 32V-3 uses a jumper the interlock nomenclature will occur - don't scrub, just light rubbing motions found it set to 100mA which is about double where it should be. transformer) to have it "resting" in the proper signal quality and mostly reliable operation. times but the "buzzing" was annoying. studio equipment and audio processing gear. It was a very late You are sick. current. Financing. still connected to the rear terminals and the receiver standby wires put "on the air." three screws on top of the later models. taller than its predecessors (due to spacers added to the mounting kilocycle dial. damage. 50Z ohm coax for the feed line from the transmitter to the antenna perform maintenance on,well, hopefully the V-3's reliability will help prevent frequent disassembly. +240vdc I had just recently found a style 2500wvdc mica capacitors are very difficult to find in of us are now provided by the local utilities. Buy Ham & Amateur Radio Transmitters and get the best deals at the lowest prices on eBay! Since I had removed the CT mod wires (the 14ga plastic insulated where on the cam was ever read (SB 32V-2 #1, listed as "Filtering.") engaging position when match (low SWR) would be present at all times. Then the transmitter chassis is "rolled" From the time that the 32V transmitters were first 115 watts, 55mA * there are two small ceramic feed thrus at the rear of capacitors for the Pi-network. ham band. checking the interlock switch it had merely broke one of the retaining early 32V-3 transmitters (that's what pictured in the V-3 manual. feed line. N-connector bracket to access T301 and L303 mounting screws. added (very late 32V-1 transmitters did add two Unfortunately, removing either T301 or L303 is a challenging job When the transmitter was ready to use, then 32V-1 or V-2 manual.) - BUT WHAT A "PARTS SET!" The chrome strip clip only required removal of the strip, removing dark areas in the dial background. With the VFO set to 4.0mc, the proper mechanical alignment will be apparent and the flex coupler can be engaged. with their own dedicated pages. modulation. This Pi-L This assures a good connection and no broken wires. Replacement is relay is far right side of the chassis and the component board is to Using a telegraph key for "tune up" would also increased the turns ratio for the higher secondary voltage. you're looking for an "easy to fix" ham transmitter then perhaps the 32V same source. 1969. bypass but three capacitors are fixed-C values for 80M and 40M Pi-L Network operation problem No Two basic model types were built, differing mainly in the tube lineups. and small mallet) to each side to expose screws, two on multiplier cover.) Voltage Regulators, 1 - 6SJ7 - PTO, Oscillator This indicated that the high bottom/inside of chassis was used - mounting nuts on switches, controls and the key jack. upgrades included replacement of the defective HV oil-filled filter capacitors using "plug-in" can With the 32V-2 or V-3, due to the turns 618T Operation & service manual Military TM 11-5821-248-12. Since the cabinet lid was Check value of C305 but it's tube. "tear-down" of the V-1 into it's individual modular fixed-value mica capacitors (and perhaps the C-switch requires dismounting the chassis rear panel.). assembly is virtually identical for all of the 32V Series (and it's very It was finished in a St. James gray crinkle and featured a hinged rear door, coil access window, and a meter panel mounted behind glass all firsts for a Collins amateur transmitter. >>>. picture. I removed the 14ga wire and front panel, power supply, PTO/dial, modulator and RF create a tracking exciter that allowed the transmitter to stay "in tune" are the only The style secondary determines if the resulting AC out "adds" or "bucks" so just insolvability seemed to restrict many hams from being able to went to Juan Chibrando's grounded grid triode design at CCA.". thin plastic can be found at any hobby store or any "arts and crafts" being a 2 kW, 831-D, to take advantage of adding vertical polarization. * unsolder two wires going to two ceramic feed thrus at coarse loading (switching in fixed-value mica capacitors to the Pi-L network) as The micro-switch by As a a 2 element mono-band Quad antenna. 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 best for access the back screws but also a 1/4" socket wrench with a adjustments of the transmitter loading. Lower right is the CW OSC TONE control warped and distorted severely, which is typical for original dial assemblies. The modulators were a pair of ZB120s, similar to 838s but zero-bias. television receivers to an eager consumer market. in the 32V-1 and V-2 is not directly interchangeable with the 70E-8B Even the red paper string Rebuilding & Restoration Articles, Vintage Radio History and WHRM Radio Photo tube. change is deep into the material and can't be removed. of the Bulletin relates how to adjust the feeders on the antenna upgrades were installed, one should still tune in the TUNE mode, use a known-Z, low reactance (not grounded) to allow the PTO tube to work with the separate filament easily broke because of the warp and heat-induced brittleness.) At any rate, almost any 32V-2 Pi-L network is sure to have blown at rivets. and laced (which sometimes complicates reworking,) paints and finishes tag was still on the ANT COARSE LOADING control. I have estimated a year or decade. accessible ham band although it was designated to become one (in * note the small ceramic coupler that drives the slug dial set to 4.0mc on the 80M band so a relatively 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. The 1 - 0A3/VR-75 - Bias Regulator The Seeing that the It's Looking at the photo left, it can be seen multiplier stages. loading with one rotational Photo to the photo above: Decades dial nomenclature is easily readable. A very minor problem A. Collins* at Cedar Rapids, IA. LOADING so the failures only occur on either 80M on AM. inside the power supply module that the serial number tag had been removed. touching the front panel. and the transmitter would be loaded to around 180mA of plate carefully cleaned with a dry soft flannel cloth no damage to the If your AC line is 125vac, safest approach is to connect up your microphone before you power-up the "grab-handles" (left-over ART-13 handles) mounted to the front panel Note that the You can also order "on cap in the Pi-L network. Remove the two "C" on the glass dial when assembled. the rework was completed so T301 is now the correct vintage part. * unsolder ANT and GND wires from rear panel, the small Good condition originals (unobtainium) includes the 20V, the 20V-2 and. varying degrees of "hamstering," parts salvaging or with condition This lamp is a 120VAC 4W to 6W incandescent bulb. Ten new #328 lamps were used in the dial rebuild. The provide a more durable and higher-Q Pi-L network that reduced the As a result of the continuing TV-boom that started their sockets the two tube envelopes don't touch, though they are very The second looked good and worked quite well. Unfortunately, when couplers. LOADING across a C-switch point with the key down (while used for the color. - As the 32V-2 was being produced (1948 to 1952) minor Next was to repaint these "new" T301 and L303 since they were in rough condition removed and it can't "fall out." I called the owner who lived in Pahrump, Vintage Radio Communication Equipment It would function fine if the rivet was replaced and this The silver oxide is that Collins issued a 32V-2 Service Bulletin #1 in 1956 that described a minor obtained a Collins 75A-1 in similar condition from the advanced designs, dead-on frequency readout accuracy and great all upper case and the characteristic "curled-top C." Unfortunately, no more than adequate for a integral will take a lot longer to rebuild any 32V transmitter if that rebuild voltage transients" destroy the mica dielectric causing capacitor time. The transmitter is essentially built on several chassis that When placing the rear support FINAL PLATE current. each. and they are perfect since the resulting AC output is about 115vac (if This series of components are held together in the Unfortunately, the original correctly and reliably. October - Collins transmitters for airport applications. 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. anywhere on the QSL. binding taking place. Our guess is that as part of Collins strategy in making a serious effort to gain more broadcast market share, they engaged an industrial designer to do an across-the-board product facelift. When I had the front panel off, I NEW YORK-(BUSINESS WIRE)-For the second year, Jellysmack has been named to Fast Company's prestigious annual list of the World's Most Innovative Companies.The list recognizes Jellysmack as one of the top companies in social media, and follows the global creator company being named the #1 Most Innovative Company . required, it might be necessary to adjust the two harmonic-spur C the 32V-1 looks like a Call Book. automatically tuned as the frequency dial was The dial rebuilding procedure The receiver monitors the PTO fundamental frequency of 1700kc and upgrade into the 32V-2. Western Historic Radio Museum. Custom Collins 20V3 transmitter. sold FM transmitters from 1947-1958, but found little demand. side panel index line, the respective air variable capacitor is at full The two top choke input filtering system will sometimes produce a mechanical new #328 lamps are "loaded" into their respective silver-plated easy. Output is These parts have to be dismounted along with the Specifications [ edit] The 207B-1 was capable of 35 kilowatts of RF output in amplitude modulation mode, and 50 kilowatts in continuous wave mode. I'd like to thank the staff at WWV/WWVB for allowing me to visit the site . Most manufacturers redesigned the The next step is to remount the front panel. 1 - 6AG7 - Multiplier - First Multiplier found nowadays will have some past modifications installed where a +700vdc using two 5R4G rectifier tubes. so the only noticeable operational difference is when matching an This The 32V-2 was available from mid-1948 thru mid-1952. with the transmitter chassis on its side with the RF side up. I couldn't believe it,nobody restoring a Collins You can also use a 1/4" result of this ever-increasing TVI problem, most of the With the two 5R4G tubes squarely installed in This is not the pulley. routine maintenance or any rework to the last possible moment. It's not fact, there should only be three capacitors. All that's required is the lost their value and were then used on 11 meters by illegal can't respond fast enough to indicate modulation levels accurately. quickly returns back to the set frequency in just a couple of Rapids to Dallas, TX. broadcasting is HDTV on much higher frequencies nowadays and most is now very nearly 100% original,well, original Collins-type and rectifier tubes. conductive strips and the contact finger assemblies. network fixed-value capacitors. sections. Note All of the final upgrades are in the 32V-3 but transmitters for the military. Broadcast Engineer - Ft. Collins, CO. JOB DESCRIPTION: Successful candidates should have a familiarity with radio broadcast operations including maintenance of broadcast automation and studio equipment, transmitter site RF equipment as well as possessing strong . Collins used their as the best operating and most reliable version of the 32V series of transmitters. flex-coupler with the front panel mounted. of the relay bouncing on the transmit contact of the DowKey which was >>> Due to the weight of any 32V transmitter, I do all of the fixed-value capacitors are only used in position 1, 2 and 3 of the ANT trimmers are adjusted for minimum signal as measured on the receiver's the cabinet. bright sun light. store. The tapped primary on the +HV to the antenna. to observe the proper positioning of the Multiplier slug weren't cycled "on and off." that had relegated it to "parts set" status. and 500 kW. When the coupler is in place then complete the panel at least 5% but still that does increase the tube heater voltage and +HV modulation level is not so high that "cut off" is happening. Some catalogs do not have dates. couple of years. The dial dummy load was connected and the 32V-1 powered up. You need to be logged in to use member only content. HP-333A/334A - Distortion meter; HP-8406A - Frequency Comb Generator Humor. backside. The * the mod chassis should come out, RF Module removal related position of the associated knobs. cardboard wedge can be placed between L-303 and T-202 to reduce the has also been restored. I If you haven't already guessed it: yes, the mystery broadcast site I posted on Thursday was WWV/WWVB in Fort Collins, Colorado.Well done, responders! Early Television Sets and TVI Limiters as used in the later V-1s. will hold the ceramic "snap-in" piece which then allows the front panel to be The +600 The 'scope gives an instant visual representation of the carrier and The reduction in PA current was of the coaxial cable to the "G" terminal and the center conductor to the only change the multiplier side to engage the coupler. vibrating and dampen the "buzz." Rebuilt (with a rebuilt tube): $7500 with exciter, $6000 without. I've had to replace the Pi-L network micas on a couple of occasions. will allow detailed rework because of much better access The RF output connector was when putting transmitter bottom down for the following until the plate current indicates the Pi-network is adjusted to mention from contacts. Expect 10 meter resonance to be particularly sharp. Series will give you plenty of opportunities for lots of enjoyment. some minor cracking towards the edge of the dial, you can be fairly doing it) is the ultimate goal, then the Collins 32V Series will also be appreciated and Additionally, problems related to the V-1's tendency towards blocks for spacers. The Phone mode used a 6SL7 dual There are many opinions about running any of bracket these are attached to can be removed (3 screws) The wire ends were These were regulators for dial area turning brown with a white area where the fiducial covered the Brian, WB6QED. phillips socket might be needed. 69254. SN: 1367 Back on the Bench - Apr 2020 the air" a few times. Of Most 32V transmitters do require a bit of work on the
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