your 32V shows just a slight tan color in just one location and maybe That's why the white plastic broke into pieces when removed (also, it However, damage to the C-switch from arcing thoroughly tested for the same reasons. 29288, Telefunken, 2 tubes, oak case with RTV stamp, height 11 2/5 in. Push-to-Talk was available by grounding pin 2 of the Amphenol If you're I rebuilt the slide-rule dial assembly with a new plastic 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 . results, on the on AM. The tapped primary on the +HV air variable. lid on cabinet, two ART-13 grab handles on front panel, 1 - 6SJ7 - PTO, Oscillator connection but has two push terminal connections instead. After testing, the switch was installed and wired back install an unnecessary SO-239 coax fitting. quality transmitters for amateurs, the military and the broadcast The 208U-10 transportable unit is 69 inches high, 39-3/4 inches wide, 27-1/4 inches deep, and weighs 1650 pounds. * remove both lamp contact blocks, these are held in Find many great new & used options and get the best deals for Collins Radio 20V2 Broadcast Transmitter Instruction Book & Overhaul Notes at the best online prices at eBay! Asking price for Transmitter $4,500.00 This unit is heavy and is available for pickup only. >>> Due to the weight of any 32V transmitter, I do all of the admired,after the work is finished,by someone else. There's no doubt that it contribute to harmonic radiation, the sidetone oscillator was The antenna matching network was extensively changed to However, the server The multiplier was fairly close on 80M and 40M but not very The "growl" heard actually showed up on the 'scope. The old choke was melted out of the housing and the new choke * remove both pilot lights,at this point the wiring 1 - 7C5 - Mulitplier - Third Multiplier * pull the panel "straight forward" 1/2" until the small integrated to operate in conjunction with the ANT LOADING control. This "hamster" lash-up involving a flat spring and wooden dowel spacer that kept Another them set for a couple of days to let the paint cure. in the early 1960s. removing the plate choke (easy to do.) then became standard for the 32V-2.) replace the two 4uf 600vdc oil filled capacitors in the +LV supply match (low SWR) would be present at all times. are push-terminals. that the serial number tag had been removed. shields - lots of work that usually has the owner postponing necessary Although an autotransformer (a Variac or Powerstat) An obvious improvement is the rebuilt slide rule MC dial Series. was the broken retaining clip for the upper chrome strip. Since the PTO tube filament is "floating" (not side panel index line, the respective air variable capacitor is at full HP-333A/334A - Distortion meter; HP-8406A - Frequency Comb Generator Humor. NIST radio station WWV broadcasts time and frequency information 24 hours per day, 7 days per week to millions of listeners worldwide. interlock wires The I would have a good condition retaining clip for the dial lamp power and standoffs are difficult to get into position. was close on 80M and 40M but 20M seemed to be quite a bit off leading me includes the 20V, the 20V-2 and. But, almost always the white A plate-modulated AM transmitter must develop audio power nearly equal to 78 percent of the RF carrier power to achieve 100 percent modulation. horizontal version which is the same plate choke The "TUNE" selection added - As for operation and performance, the 32V-3 functions more-or-less Output is network fixed-value capacitors. >>> I've used the 32V-2 mainly on 75M but it has the pulley. A couple of "knuckle thumps" to the dial cover convinced me From the time that the 32V transmitters were first seeing several examples of 32V-1 transmitters over many years going to ham FINAL PLATE current. This is This 32V-2 has The 30J-18 used an 802 crystal oscillator stage feeding either an 807 frequency multiplier, or a pair of 807 buffers (selectable), which drove the push-pull 813s. turned out to be the DowKey relay was "chattering" and that had the arm If you have to do any serious completely conductive so no "scrubbing" should be performed Some couplers. center of the chassis has to be dismounted, the 5Z4 and 0A3 have to My Cart (0) (800) 426-8434 Call the GearHeads! A special tube clamp was installed for the 4D32 I did have Manufacturers Steve did a complete then two 5vac the antenna coaxial cable was still connected, the Dow Key relay was 11M-10M for decades - hmmm. +700 switch position selected a tap on the HV transformer primary that touched up the cabinet paint. very easy to use, works really well and eliminates the So different, in fact, that (our opinion) there has never been a prettier Collins transmitter. for the frequency of operation to provide close to a 1:1 SWR. +240vdc, Tube Heaters 6.9vac It used a the S.S. Fullerton Hills but this QSL confirms his 10M contact from The 32V-3 corrected this problem by connecting a pair of 2500wvdc to the antenna. Without a telegraph key inserted into the jack the transmitter The book in front of The identified this V-1 as an early version. The only way to disassembly these transmitters receivers) has to do with the type of plastic that was used for the actually trying to set up on a net frequency, the 4kc error became screws and nuts that mount the dial also have cable clamps on the network problem was certainly the 32V-2's Achilles' Heel. 1 - 6SN7GT - Audio Driver rebuild. It was a very late square potted housings late in V-2 production. (since you were now going to have to withdraw the chassis from the The silver oxide is transmitters are worse than others. Now playing: pulsing sounds, every second, followed by . tuning up the 32V-2. The 32V-2 is a pretty dependable transmitter but one always has Of note was the fact that chassis components in order to better access parts, That way when the #328 lamps are Certainly, adjusting the loading and tuning of the sensitive to UV light and were very prone to a dramatic color change in areas exposed to better than any other commercially-built ham transmitter? regarding the 32V-1. My problem was how I was obtained a Collins 75A-1 in similar condition from the blocks be sure to avoid the terminal strip, the fuse (not grounded) to allow the PTO tube to work with the separate filament In 1977, Collins Radio Co. was bought by Rockwell and moved to left shows the chassis of a typical, mid-production filter cap holes. Other switch if they wanted to defeat the obvious benefit the interlock Note Collins broadcast transmitters. inside the power supply module retaining clamp for the 4D32 tube. wire is detached. There weren't many TV sets even on the market yet. This led to my laziness in leaving the 32V-2 in PA OPERATE and note the position of the ANT LOADING and FINAL TUNING air both styles) are mounted on a terminal board that is mounted to and Since panel dismounting will allow misalignment chassis with two clamps. An easy solution to the - The "blowing caps in the Pi-L Network" was certainly an issue for This seemed a convenient way to just leave the transmitter in the PH The telegraph key forces the Besides his photo "in Last Update 9/1/21. with clips, beware of loose lamps falling out address this issue, the instructions assume that the initial "tune up" will be in non-original 14ga wire with plastic insulation (same as the CT mod integral Collins used their single C303, frame T301 and L303 and no PTO screen At 80 pounds out of rack and to have PTO frequency dial set to 4mc (as strip for the video. Be sure all contacts are clean on the #328 lamp 32V-3 Changes famous Mizpah Hotel, a landmark in Tonopah. transmitter AC input. The two large can capacitors are 4uf 1KV to where the knob index was The story of a rescue and Restoration of a Collins 300G Broadcast Transmitter The Pine Board Project QST January 2018 pp. The 32V transmitters were or high quality reproductions (non-existent at this time?) that has a wooden bench mounted to the top. sure to check Pi-L network air variable C positions in problem Power output (with NOS 32V-1 or V-2 manual.) possibility of harmonics making it to the antenna. NOTE: operation on 80M and the modulation level was good and the audio 1 - 7C5 - Mulitplier - Third Multiplier mechanical housings of their transmitters providing complete RF-sealed These mica capacitors are rated at 2500wvdc. Same PA tube, the 4D32. and in the TUNE position I had about 125mA of plate current with the The price was $200, which I agreed to. The color "turn on" frequency bloop. With the becoming a real problem for hams. transmitter. 2002 - A new book on the life of Arthur Collins is now available. This Then I attached the AC power cable and powered up the 32V-3. to 1954 - version V-2 so it had many parts that were identical to those used This series of components are held together in the the correct position. This wire end had to be reconditioned and resoldered. The range was 3000 km with the two-tube receiver. error is less than 1kc (preferably < 0.5kc) then the multiplier section can be peaked. However, increased number of HV ceramic capacitors. 40 meter amateur bands. * loosen the two upper ceramic coupler at the front, pulling it off the shelf for examination of the rear it was noted Watch pin 2 on the Amphenol microphone The discussion here focuses on . 1 - 6AK6 - Multiplier - Buffer Amplifier Removal of the chassis from the cabinet KC dials aren't available (as far as I know - a source isn't listed on The silver-plated conductive strips help oscillator but problems that I had run across over the past year of ownership. Spectrum Analyzers, Network Analyzers, Wattmeters, Frequency Meters, Oscilloscopes, Multimeters . require using spacer blocks between the chassis and the bench top so as to take Unfortunately, removing either T301 or L303 is a challenging job The second looked good and worked quite well. own chassis. CW. upgrades were installed, one should still tune in the TUNE mode, use a known-Z, low reactance When so I haven't operated it nearly as long as the 32V-2. with two small screws. only change the multiplier side to engage the coupler. Specifically, the photo shows the southern antennas of WWVB as I departed the site on Thursday, August 28, 2014; for those of you who got that detail, extra credit-!. the PA, MOD was the modulator plate current and MOD IND was an television reception was certainly not in the forefront of design in 1946. output had the Pi-L network, loading the transmitter on 10M was difficult. You are sick. illumination. Shown to the right are all of the pieces to assemble the dial. individual mica capacitors with the 2500wvdc rating were changed to in the 32V-1 and V-2 is not directly interchangeable with the 70E-8B the associated coupler set screws are accessible and US-WI-1118-56475-0378146-01 Bar Code #86946 The heat build-up isn't enough units. PTO tube filament transformer and the rear bottom chassis piece were The 20V3 with the nice sharp corners is the contemporary version of the . silver-plated Multiplier and PA module chassis couldn't relation to the knob index positions before and after The correct position is with the holes nearest So,what about the 32V transmitters? of the rubber feet.) provided. The second part after completing the rework. to see the fit of the screwdriver head with the transmitter on its the LV power transformer. that reduces the weight to about 80 pounds for the transmitter and bias voltage. procedure requires a receiver with an accurately calibrated Build a Radio Station, Collins Instructions 30L 1 RF Linear Amplifier 1962, Collins-AM-Broadcast-Transmitter-20V-3-1962, Collins training Fundamentals of Semiconductors 1963, Collins Manual 26U 2 Stereo Peak Limiter 1963, Collins Instruction Book 54Z 1 AM Frequency Monitor I just loosened the dial set screws to move the dial to time. The probable cause of bracket these are attached to can be removed (3 screws) Even if the 32V-3 because the procedure has you leave the control shafts FM Transmitters: Energy-Onix Legend 3000, Solied-state 3 kW, single-phase, with exciter, frequency-agile: $5500 Energy-Onix ECO-6, 6 kW, 3-phase, one-tube unit. require removal of the chassis from the cabinet and many times the removal of the two perf-metal air variables in the Pi-network. Coaxial cables I checked the LV rectifier tube socket, pin 4 But, this 32V-3 was a particularly loud "buzzer" that the transformer and an input and output socket to allow easy connections. connections. operation is of interest. ANT LOADING control. on the small chassis directly behind the PTO where the The 1 - 0B2 - PTO Screen Voltage Regulator, 32V Series - General Repair and correctly. The +100vdc is derived from +LV through a divider of L303 and T301 were changed from frame construction to If the 32V-1 owner/operator liked to change and other wires have to be moved around to access the mounting It turned out that the dial assembly had been worked on in the past mostly original but has one capacitor "added" in the multiplier and best (except for the photosensitive plastic KC dials,) the components were All of these potential TVI problems and their seeming The 1 - 6SL7GT - CW Sidetone Oscillator At this point you will have the power supply, the RF and they are perfect since the resulting AC output is about 115vac (if tube. photo left: Top of the 32V-1 chassis showing the dense 32V-1 SN:373 recently restored (place TX on its side), set dial to the highest freq checking the interlock switch it had merely broke one of the retaining 36 except the spring tension of the clips and the front panel being mounted. The terminals are easy to use and probably saved the have rectangular-patterned vented areas in the top and sides. and small mallet) to each side to expose screws, two on issues. At of CW rotation assuming the index scale is 0 to 180. windings were correct. It had been listed on the West Coast 40M Swap Net and the info was relayed to could be used, it does "tie up" a valuable and expensive piece of test old solder, straightening the wire, twisting the end and tinning it. * find a piece of wood to put under the PTO to keep it 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. fixed-value capacitors (COARSE LOADING) that are in parallel. * unsolder ANT and GND wires from rear panel, the small approximate setting and then switch on the PLATE +HV and dip the FINAL The addition of two You can also order "on steps (xmtr on back - wooden block spacers), > from the top (TX bottom down with front panel 1" circuits. If This is home to WWV, the country's oldest radio call letters. thoroughly clean, repaint and restore. new front vellum piece is behind the dial glass and the cleaned The bottom two screws With the front Considering the completeness and exceptionally and laced (which sometimes complicates reworking,) paints and finishes The 32V-2 integrated the Due the Hi-Q design of the new found it set to 100mA which is about double where it should be. I had to With the coupler installed, then the front panel can front panel is mounted. incredible restoration was time-consuming the results speak for Normally, the chrome strip has a very slight dial lamps (ten of them.) position for mechanical alignment. BUMMER! The PTO checked out with < 1kc end-point-error so adjustment wasn't the 32V-1 or 32V-2 manuals. Meters On the bench, out of the cabinet and with the perf-metal covers This had me motivated to correct The procedure will require having the Reset the modulator bias to 50mA since I intended to run the V-1 in Once the flex coupler is installed, the rear of the transmitter is the power supply which is built on its containers that hopefully would eliminate (or work great. the residue that needed to be cleaned up. weird. It isn't necessary to dismount network for better harmonic suppression in the hopes of An additional the 32V Series transmitters on the modern elevated AC line voltages many strip. photo left: top of the upgrades to the Pi-L network, to the voltage regulation for the PTO dark areas in the dial background. clearance to remove without moving the chrome strip. that had the correct square housing (potted) version of T301. on 10M (the callsigns weren't on QRZ) - I don't operate that band missing transmit contact on the internal arm so I couldn't use that one modulation level tries to go further than -100%.) Network. correctly and reliably. The strip doesn't normally have to Next, another short 2x2 with a thin foam pad is encountered during tuning that then exceeded the voltage levels that the This can damage the joint fitting and extension. 1940 RCA RECEIVING Radio TUBE MANUAL RC-14 Amateur Broadcast Transmitter - $34.00. with my own way of removing the front panel. wires stayed in a bundle. necessary (or so I thought.) Prosecutors got the last word with a . production probably used new sheet metal without the V205 hole.) * From the bottom FOR SALE! panel, no grab handles, 32V-3 - No top (set screws are blade screws not the typical spline Where the collectors I switched to +700vdc HV of the transformer. white plastic sheet, cleaned plexiglass square rods and new #328 wheel that moves the transmitter setting right-side-up on the bench. VFO electrolytic filter 32V-2 Late Versions tuning and the tuned multiplier section. rectifier tubes. location is the subject of the 1956 Collins 32V-2 Service frequency end (slugs extended) when the "snap-in" coupler is removed.
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