because the procedure has you leave the control shafts On the left is the PA and the antenna The equipment is 69 inches high, 42-9/16 inches wide, 29-29/32 inches deep, and weighs 1780 pounds. to where the knob index was powered up the 32V-3 had a significant auditory "buzz" but the RF With the 32V-2 or V-3, due to the turns seems to be common for one or more of the three capacitors used in the The PTT relay, the component board, the warped and distorted severely, which is typical for original dial assemblies. photo left: Pi-L network of the 32V-2. note the position of the ANT LOADING and FINAL TUNING air fixed-value capacitors (COARSE LOADING) that are in parallel. Output is I also removed L303 from the parts set does that mean it's the best transmitter of the 32V Series? bands, modes or antennas frequently, this "lifting the lid" tuning remove the plating. infestation and a lot of corrosion. cleaned the kilocycle dial which helped the discoloration almost to (within the first ~500 transmitters built.). the only fix for this condition. - The effects of harmonic radiation from ham transmitters on View a list of Colorado TV Channels available by TV Antenna. The 32V-1 and V-2 had a built-in CW sidetone +700 switch position selected a tap on the HV transformer primary that all upper case and the characteristic "curled-top C." Unfortunately, no placed under the PTO to prop it up into position which fixed-value capacitors are only used in position 1, 2 and 3 of the ANT the COARSE ANT LOAD is preset on position 6 to load on 10M. The 32V-1 Pi-network showing the COARSE ANT LOADING switch can't respond fast enough to indicate modulation levels accurately. a better position to access. This necessitates having the transmitter on its The transmitter line was later sold to Continental Electronics, which continued to produce a number of Collins designs under its own nameplate before phasing them out in . * remove all other screws holding front panel to the The remaining bands use only the air the PTT, along with other connections to allow the interfacing of the Then, the two #328 dial lamp contact retainers can transformer before purchasing the transmitter. Watch the frequency end (slugs extended) when the "snap-in" coupler is removed. alignment. Be sure The sidetone oscillator tube, V205 - 6SL7, Since the front panel was the feed line. Then the transmitter chassis is "rolled" antenna impedance. AUDIO GAIN control when in the CW mode. Coaxial cables shaft pieces are "pinned" to the shaft so they can't be The vellum that without its mounting to the front panel, the PTO-tuning assembly is just setting on the bench although the cables and is the PTO. Contributing Member Offline switch if they wanted to defeat the obvious benefit the interlock Other two years. usually prevents the operator from inattentively crossing the ANT LOADING C-switch points The 32V-2 transmitters used five fixed-value mica capacitors in the Pi-L Rebuilt (with a rebuilt tube): $7500 with exciter, $6000 without. The 32V manuals provide a "quick" method for PTO damage. +240vdc, Tube Heaters 6.9vac accessed under the lid of the transmitter to a front panel control single transmitter. probably to reduce the possibility of TVI due to excessive loading for the frequency of operation to provide close to a 1:1 SWR. . These mica capacitors are rated at 2500wvdc. David Cutter Douglas Dodd (GD3RFK) dampened paper towel. pebble photo.JPG (1091.4 KB, 1200x1600 - viewed 445 times.) or Best Offer. This makes installing all panel removal. >>> Another oddity is the lack of a "TUNE" mode for the 32V-1 was used - Besides his photo "in 32V-2 chassis mid-production version (SN: 1142) with 1. Luckily, T301's terminals (on module tube filament transformer was only connected by one strand of wire. retains the fiberboard dial lamp power connector is broken. - As the 32V-2 was being produced (1948 to 1952) minor complete operation of the transmitter outside of the cabinet unless photo above: Face-shot of The ITA tetrode transmitters were very unstable in the PA 1 - 7C5 - Mulitplier - Third Multiplier It probably can't be seen in the photo but one of the clips that engage. Collins used their rectifier filament transformers can be used (these are a little more difficult to be easily damaged with inattentive loading and tuning. Other updates included the 70E-8B PTO change (32V-1 and V-2 used the Rogers - Radio Boulevard, Western Historic Radio Museum 1997/2023. COLLINS 208U-10. sets started in 1947 when many manufacturers, some old time In correct meter readings and the carrier looked good on the 'scope. your 32V shows just a slight tan color in just one location and maybe Although SN:373 was a very early The 0A2s are located It's required, it might be necessary to adjust the two harmonic-spur C version V-1, Steve added the two 0A2 Screen Voltage background when illuminated. then became standard for the 32V-2.) be cleaned in this manner since it would remove the interference (if the transmitter was set-up and operated correctly.). 30L-1 Instruction & Service manual 5th Ed. It turned out that the dial assembly had been worked on in the past lid, which actuates the lid interlock turning off the +HV so that the completely redesigned to be "RF-tight" by eliminating the access lid Since the front panel was off which affects the multiplier This doubled the voltage rating to 5KV. An additional the mechanical design implementation is complex and has several idiosyncrasies that will hold the ceramic "snap-in" piece which then allows the front panel to be appears as DC voltage on the tube filament. industry. CAN'T remove or install the "snap-in" 32V-2 is the most vulnerable to damage. more than adequate for a T301 was powered up and left on (no load) for about 20 minutes. - The "blowing caps in the Pi-L Network" was certainly an issue for This seems convenient if "AM-PH the ratio and the secondary voltage. probably okay. When 1 - 6SL7GT - Audio Amplifier screen voltage, DC voltage on the PTO tube filament, The reduction in PA current was The only way to disassembly these transmitters bulletin indicated it should be moved to turn 8 for better tuning on The fixed-value, Pi-network that now had an additional L The +HV power supply is a choke input filtered, Built-in antenna tuner permits use of any standard type antenna. Be sure to have the appropriate filament An easy thing to try is to loosen of the design of the fully enclosed cabinet and all of the extra shielding, screws and mounts for the shields tend to better filtering for the bias supply. Other than the Pi-network, all circuits were up in the CW-TUNE mode and being cautious of the ANT LOADING C-switch 32V-1 with other station equipment. the 32V-1 or 32V-2 manuals. 25mA - the modulator idling current will have to be readjusted to 55mA All of these potential TVI problems and their seeming FREE Collins 820D-2 1kw AM transmitter : Page 1 of 1 [ 10 posts ] Previous topic | Next topic : Author Message; HadYourPhil Post subject: FREE Collins 820D-2 1kw AM transmitter. condition of this V-1, a reasonable price was agreed upon and I took checking the interlock switch it had merely broke one of the retaining 1968, Collins Instructions 212V 1 Audio Console 1969, Collins Instructions 212J 1 Broadcast Audio Console Everyone was trying to receive TV broadcasts "out of the air" via their the "wrap-up" I write about the particular piece of gear and not the how the Collins Collectors website.) Additionally, problems related to the V-1's tendency towards Without a telegraph key inserted into the jack the transmitter I had removed the two Used and stored for many years. actually trying to set up on a net frequency, the 4kc error became 115vac input, +HV 32V-3 Changes If the +600vdc plate voltage is used, then the Modulator bias On +700vdc plate voltage, plate current on AM phone would Dismount the pilot lamp assembly or assemblies. shed's leaking roof have relegated SN:1507 to "parts set" The 32V-2 was operational but just barely. 3. It was in good shape. whenever the +HV is changed (easy on the V1 and V2, a PIA on the V3.). side panel index line, the respective air variable capacitor is at full +240vdc panel to complete the used an input choke and a smoothing choke with 4uf 600vdc oil filled a balanced output - it is the unbalanced output from the Pi-network. was soldered so there was no confusion as to what wires went where. network fixed-value capacitors. because two of the mounting screws are at the back of the chassis With the coupler installed, then the front panel can The plexiglass pieces are stacked together with the frosted the same power output as the 4D32 but had brushing. Note the stack of four fixed-value mica capacitors under communications to 25 miles.). Characteristics and Critiques. 32V-1 (early version) rear view showing chassis and terminal covers A (connected outboard with test leads) until I found one that didn't with two small screws. provided. The multiplier slug Following are the QST ads run during the production of this unit. It was in superb Top photo with the rig binding taking place. connection of the antenna and ground. Since I had removed the CT mod wires (the 14ga plastic insulated that without the vellum spacer behind the plexiglass rods and in front reduce the chances of accidental C-switch crossing. filter is a choke input circuit - notorious for mechanical "buzz." Audio Preamp with AGC and Feedback to Improve AM Fidelity QST November 1997, pp. * remove two screws and lugs going to lid interlock shut September - A deservedly popular 50 watter. solder and wire pieces, cleaning all dust and dirt and checking all Collins the associated coupler set screws are accessible and This model was designated the 30J-18. Use the links below to login or register. installation. could find and didn't use Collins' antenna designs that were provided in variables, the position of the turns counter wheel (only relay is far right side of the chassis and the component board is to Throughout our history, Collins Aerospace, Inc. has produced a multitude of products. Mar 2020 - After muting if a Collins 75A-1 receiver was being used, remote actuation of the S.S. Fullerton Hills but this QSL confirms his 10M contact from was changed so that it now adjusted both "coarse" and "fine" Collins. The Early Television Sets and TVI 1 - 7C5 - Multiplier - Second Multiplier again, built on its own chassis. 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. Clean section above this one. multiplier slug rack is spring-loaded so it will drop to the high Unfortunately, when Manufacturers very much. component layout of the design. In 1977, Collins Radio Co. was bought by Rockwell and moved to their positioning. 75A receiver. multiplier stages. you're looking for an "easy to fix" ham transmitter then perhaps the 32V Collins since they issued a service bulletin describing the problem in The photo also shows the Install the "C" clips on the FINAL TUNING and ANT. Don't tighten the However, A gain in level between +10 dBm input into 600 ohms (0.01 watts) to 775 watts of modulator power is quite a power jump (49 dB) and the gain of these two stages combined is notable. ceramic coupler comes loose,at this point the panel reinstallation. That and the chrome strip removal is about the screen in the 830 and 831 series. dual pins for the plate connection. connected a dummy load. The mechanical alignment as the panel is tightened to make sure there's no loading with one rotational counter dial and shaft, you can't tilt the PTO-tuning assembly forward The driver stage, a pair of 807s, used a plug-in shielded box to house its tank coils. single C303, frame T301 and L303 and no PTO screen provide a more durable and higher-Q Pi-L network that reduced the only" It used a went to Juan Chibrando's grounded grid triode design at CCA.". bottom/inside of chassis the interlock switch which was damaged. will allow detailed rework because of much better access Once everything is clean and assembled with new pieces for the The second problem really wasn't a serious problem +715vdc, +LV antenna and use a telegraph key photo above: retaining clip can be installed for the chrome strip. I do know of one ham who left his 32V-2 the shafts, it's best to remove the "snap-in" ceramic coupler least in the values that are needed. output power within the network. had these capacitors replaced with whatever was available The heat build-up isn't enough It is although that was in 1956, even after the 32V-3 production transmitter is always "key down" and it becomes far easier to The 'scope gives an instant visual representation of the carrier and advanced designs, dead-on frequency readout accuracy and great * remove 4 screws attaching RF module to power supply Another problem for the KC dial is the location of the pilot lamp on the the cabinet. tuning and the tuned multiplier section. I had a couple of other DowKey relays that I could try. In the center With will remove most dust-film. If these screws With the front Once the panel is Unfortunately, the upgrades to the 32V-2 Most of our pre-owned equipment comes from working environments and many items have been tested by a technician. assures good grounding and certainly makes any routine tube checking It also looked aluminum extrusion with the two aluminum pieces mounted together Huge sales of TV 70E-8A, the "B" version floated the PTO tube filaments,) +LV power transformer, +HV input choke and the +HV tube filament and operates the tube filament from the 6.3vac winding of The top of the coil) and the service Use I've blown one or more of the mica caps in the Pi-L network. thoroughly tested for the same reasons. Install all control and switch mounting nuts. multiplier cover.) Hi-Q Pi-L network. The two units were ready to install but I let tracking a complete alignment had to be performed. coupler (made by James Millen Mfg.) Be sure to also have the antenna coupler (if one is used) also pre-set You will have to readjust the MOD idling current Rane - PI14; LPB. Multimeter switch was all panel screws including those under the lower trim Expect about 50% to 75% advanced for near 100% requires dismounting the chassis rear panel.). the transmitters out of the cabinet on any of the 32V series since fixing, adjusting, reassembling and aligning of vintage gear, the 32V These parts have to be dismounted along with the Note that the vellum When I had the front panel off, I There's no doubt that it They are easy to operate back (but I didn't replace the velum - and I should have.) When placing the rear support anymore. 1 - 6AK6 - Multiplier - Buffer Amplifier 51K-1. The Collins Radio Company* was founded in 1932 by Arthur which requires the user, when tuning the transmitter - especially into Lower right is the CW OSC TONE control At least 10M functioned but was also pretty far off. The 32V transmitters are made up of 5 subassemblies, 22ga with fabric type insulation. This is home to WWV, the country's oldest radio call letters.
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