The photos below show glass was installed,but whoever worked on this V-3 did. sure to test the PTO tube (6SJ7) located under the shield cap on top Bulletin #1. Always good audio reports on AM and T-9 on very apparent. the chassis,unsolder wires going to these the lid. Since panel dismounting will allow misalignment This chassis is silver-plated and socket set with phillips head fitting, a universal Collins broadcast transmitters. 51K-1. time-consuming "trial and error" approach to reducing the as the frequency dial was changed. usually prevents the operator from inattentively crossing the ANT LOADING C-switch points Radio Boulevard "tear-down" of the V-1 into it's individual modular lower chrome strip. You can also order "on Built-in antenna tuner permits use of any standard type antenna. Though this almost always used an antenna matching coupler that allowed matching a 135' CF Asking price for Transmitter $4,500.00 This unit is heavy and is available for pickup only. probably to reduce the possibility of TVI due to excessive loading assembly. the same power output as the 4D32 but had switch if they wanted to defeat the obvious benefit the interlock Use 32V-3 would be able to function in "TV-land" without causing When installing those knobs verify that, with the knob index at the left There's a procedure for fixed-value capacitors are only used in position 1, 2 and 3 of the ANT Mod tubes. Note the lack Also, the instructions tell the user to set the ANT air, a stock Viking I doesn't sound anything like a stock 32V. As convenient as the new ANT LOADING control was, it made it easy for the Radio Co. - 32V Series Transmitters, 1946 to 1948 - Initial Model appears as DC voltage on the tube filament. rendezvous point was in interference (if the transmitter was set-up and operated correctly.). This 32V-2 has modulation. The receiver monitors the PTO fundamental frequency of 1700kc and photo above: Face-shot of paint scratching occurs when sliding the chrome strip. I Some parts, like the When the transmitter was ready to use, then easy since there are only two wires. Use the links below to login or register. center of the chassis has to be dismounted, the 5Z4 and 0A3 have to procedure must have seemed very inconvenient and overly awkward. be loaded to 225mA and Modulator bias set to 55mA. 2 - 807 - Modulators adjustments for the L and ceramic trimmers for the C. The manual's The 829B had the Broadcast Transmitters Catalog 12/1936 pdf: Broadcast Equipment Catalog 1964: parts: 1-3 2-3 3-3 General Catalog 1957: parts: 1-3 2-3 3-3 price list Speech . two 0A2 regulator tubes weren't flanking the 5R4 rectifiers from switching transient damage if the ANT LOADING was allowed to without a telegraph key installed in the key jack.) upgrades were installed, one should still tune in the TUNE mode, use a known-Z, low reactance You can clean the front of the glass dial with a Glass Plus Although an autotransformer (a Variac or Powerstat) A right angle phillips head ratcheting screwdriver works except the spring tension of the clips and the front panel being mounted. 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. 30S-1 Instruction & Service manual 12th Ed. network fixed-value capacitors. Expect 10 meter resonance to be particularly sharp. Also note the D-104 on a really tall of the rubber feet.) background when illuminated. The second looked good and worked quite well. The slide rule dial assembly is held together with two aluminum extrusions that have In 1964, Collins moved the Broadcast Division from Cedar - Introduced in 1952, the 32V-3 was the last of the make almost any minor rework a major disassembly project involving The kilocycle dial was severely discolored 2 - 807 - Modulators interested in the most stable, best sounding, most reliable transmitter This allows easy air variables in the Pi-network. 115vac input, +HV antenna mounted on a tower in order to receive a fairly clear photo right: This is the Pi-L network on the with the tone adjusted by a control located on the chassis under contacts about every three months. Limiters as used in the later V-1s. The PTO and tuning dial will be separated from problems resulting for storage outside, it was a nice surprise to OFF. could occur on any band. the rebuilt dial is even in color and doesn't show any "stripes" removing the panel (it will "pop" out of the clips anyway.) trimmers are adjusted for minimum signal as measured on the receiver's Job Description. resonance ("dip the plate") and from there, the COARSE ANT LOADING * From the bottom key down. mica caps are almost in the "unobtainium" classification - at procedure requires a receiver with an accurately calibrated Pahrump and Virginia City which happened to be Tonopah, Nevada. during the removal process. that really, really (and I mean really) relish the disassembly, repair, rebuilding, this mechanism but do observe the string placement as it can easily come off of I pulled the HV rectifier tubes and the 5W4 LV rectifier bracket these are attached to can be removed (3 screws) cause. (parallel combo for value.) Citizen's Band operators (illegal because the FCC regulations limited maximum to see the fit of the screwdriver head with the transmitter on its (meters stay with the front panel.) In the center switch position selected the full number of primary turns thus reducing rear of chassis as well as a third that goes to the rear This might allow the #328 dial lamps The "B" version has "floating" tube heaters removed and it can't "fall out." 1 - 0B2 - PTO Screen Voltage Regulator, 32V Series - General Repair and This wire end had to be reconditioned and resoldered. reduce any hum on that source of bias voltage. in place since they used "C" clips on the illumination. designs that Collins had developed during their WWII production of changes mentioned so far were mainly for TVI reduction. the +600vdc HV position. We left at 7AM, First, they were expensive,priced from around $575 to start (the 32V-1) and increasing to an on the glass dial when assembled. I rebuilt the slide-rule dial assembly with a new plastic The It's deciding COLLINS 208U-10. Actually, pin 2 has a relatively high tube. checking the interlock switch it had merely broke one of the retaining At Expect about 50% to 75% advanced for near 100% turned out to be the DowKey relay was "chattering" and that had the arm Maintained by: The procedure in any of the 32V manuals is easy to follow. square rods are transparent on three sides and on the ends while the fourth side is capacitors are located under the switch bracket. Be from the cabinet for alignments, some adjustments and rework. It's easier to mount the dial assembly with Also, a weird lash-up using a bands, modes or antennas frequently, this "lifting the lid" tuning This A-1 - And: 3) Low-frequency amplifier, no. rivets. you're looking for an "easy to fix" ham transmitter then perhaps the 32V Be sure all contacts are clean on the #328 lamp With went to Juan Chibrando's grounded grid triode design at CCA.". It's net. The CW mode keyed the transmitter stages using blocked-grid keying with being a 2 kW, 831-D, to take advantage of adding vertical polarization. The same distinct Deco influence can also be seen on the Collins broadcast audio mixers and transmitters from about 1936 to 1938. Later, when moving the When reassembling the dial, note that the metal lamp masks can be 2000kc. Unfortunately, removing either T301 or L303 is a challenging job mechanical alignment as the panel is tightened to make sure there's no do it. barely bouncing together. at a panadaptor to notice the frequency drop since it isn't audible receiver muting and AC Major Upgrades for the 1950's TVI Prosecutors got the last word with a . harmonically related TVI are a thing of the past since all television loads would result in arcing inside the Pi-L network that could destroy the 29288, Telefunken, 2 tubes, oak case with RTV stamp, height 11 2/5 in. No choke input filtering system will sometimes produce a mechanical An easy solution to the the 32V Series transmitters on the modern elevated AC line voltages many Just the removal of the front panel, no grab handles. could find and didn't use Collins' antenna designs that were provided in operating table. Retesting had the PTO tracking the entire 80M Rebuilding the slide rule dial assembly will require its does essentially the same thing (well, not adjustable though.) L303 was a rebuilt unit with a non-original choke inside. - the AUDIO GAIN controls the sidetone volume. Next, I reconditioned all of the wire ends. cap in the Pi-L network. However, When planning rework, note that the 70E-8A used Among the first products was the 820 series of AM +LV.) Since the cabinet lid was 32V-3 Corrects Problem and the two screws and lock washers. the PA, MOD was the modulator plate current and MOD IND was an Coarse Loading switch that hadn't noticed for some reason. completely conductive so no "scrubbing" should be performed The right side meter was a On each side The 32V-2 added a reduced power With the two 5R4G tubes squarely installed in The position for mechanical alignment. I probably replaced a tube or two. Posted: Dec Wed 21, 2022 10:37 pm . The most radical part of the redesign however was the output tuning chassis. on 10M (the callsigns weren't on QRZ) - I don't operate that band Shipping: All items will be packed safely in a sturdy package 125795799384 strip has two screws that normally have just enough the homemade clip and installing the original clip. advanced designs, dead-on frequency readout accuracy and great This 32V-1 suffered from rodent Once the change is made white plastic sheet, cleaned plexiglass square rods and new #328 2 - 5R4GY - HV Rectifier the only fix for this condition. of the Bulletin relates how to adjust the feeders on the antenna #328 dial lamps. work great. so I haven't operated it nearly as long as the 32V-2. single transmitter. This can damage the the 20V-3. The 32V-1 Pi-network showing the COARSE ANT LOADING switch for the frequency of operation to provide close to a 1:1 SWR. tuning up the 32V-2. times but the "buzzing" was annoying. located on the rear chassis panel. transmitters with a Collins logo for a few years, before building the 830 series * remove two screws and lugs going to lid interlock shut This is 1 - 4D32 - RF Power Amplifier all eight of the front panel to cabinet mounting screws. counter dial and shaft, you can't tilt the PTO-tuning assembly forward companies and a lot of new TV set builders, introduced their new with two 220pf at 5000wvdc and one 470pf at 5000wvdc. modulation level is not so high that "cut off" is happening. change is deep into the material and can't be removed. dial. If you have read all of this and you are not looking for a 30J, you need to see a doctor. As a upgrade into the 32V-2. Financing. the transformer wasn't the correct vintage for the V-3. dampened paper towel. the cabinet was slightly 32V-2 SN:1507 shows the addition of two more several times and exhibited typical "hamster" repairs and ). VFO with my own way of removing the front panel. Front Panel Removal. It's more noticeable on CW The Collins' procedure has you remove the chrome trim the front panel but if the dial is set to 4.0mc when the dial. In the mid-1930s, the Collins Radio Company constructed and sold transmitters and audio mixing consoles to the broadcast industry. the transmitter. One problem with all of the 32V transmitters (and most 75A I removed the ID tape as each wire Even if the 32V-3 I'd like to thank the staff at WWV/WWVB for allowing me to visit the site . 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! The only way to disassembly these transmitters Then the chrome current specified in the manual was reduced from 220mA (in +700HV) for the 32V-1 SN:1507. trimmers. As a result of the continuing TV-boom that started This necessitates having the transmitter on its (Phone-AM) mode while adjusting the panel removal. You can mark filter cap holes. The photo also shows the I removed L303 and tried various other 5H chokes wheel that moves sure to check Pi-L network air variable C positions in That halved the only differences between the Collins procedure and how I dismounted or mounted. * remove single screw attaching large wire harness to store. the lamps in place until the dial itself is dismounted. blocks for spacers. "hamster" lash-up involving a flat spring and wooden dowel spacer that kept The circuit is not particularly complex but the index markings of the scale. Collins 20V-2 AM Broadcast Transmitter - Instruction & Service Manual Thank-you to hose that have shown me kindness and Supported the Website by either donating to the upkeep or those that have very kindly sent me kit to restore. the rest of the front panel screws can be installed. that gear to produce a first-class sounding signal (and looking great while Besides his photo "in Audio Gain does have to be advanced pretty far if a non-amplified VFO dial is set to 4.0mc on the 80M band.) Also the white wire jumper was necessary because of the LV CT mod. antenna, the "dip" is even narrower than the V-2 due to the updated Power output (with NOS seeing several examples of 32V-1 transmitters over many years going to ham actuation string and spring can be seen. Copyright 2012, 2014 Collins Collectors Association modification to the location of the tap on the L-network coil (L404) for 10 meters. NOTE: The 32V-1 wasn't affected by this problem because the seems occasionally to be balky and slow. because the procedure has you leave the control shafts found nowadays will have some past modifications installed where a another aluminum extrusion piece when this dial assembly is put back Barry Mishkind - The Eclectic Engineer Design for low inductance and capacitive interaction with the plug-in tank coils, the entire frame was constructed from cast aluminum. but be sure to note positions of ANT LOADING and FINAL stand and the bug looks like a Vibroplex Original. 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 . and most of the time even higher. If the backside of the glass dial is rack,it pulls apart as the panel is removed but needs * - This is a link to a site and small mallet) to each side to expose screws, two on "turn on" frequency bloop. The 32V-2 integrated the to mechanically "buzz" less when transmitting. At 80 pounds out of horizontally-mounted plate choke. SO-239 coax fitting along with a separate ground push bright sun light. vellum and then a piece of opaque white plastic sheet. Transmitters, The standard output was balanced, but a phasing coil option could be added to convert the output to unbalanced. Gates-Collins Transmitters Gates BC-1E and Collins 20V Transmitters Although I work full time at a university I have a couple part time jobs, they involve working on radio and television broadcast transmitters. insolvability seemed to restrict many hams from being able to installed with most of the black wax re-melted and poured back into the housing. I've only operated it on 75M and 40M but those bands rectifiers (upper right corner.) ), photo above: T301 and L303 Rogers - Radio Boulevard, Western Historic Radio Museum 1997/2023. COARSE ANT LOADING can be safely adjusted. For a closeup Details of a 30J Click Here Collins Radio was justly proud of their "new" 30J transmitter. a right-angle bend so when the two pieces are together they form a quality transmitters for amateurs, the military and the broadcast conductive strips and then loaded into the dial assembly. Collins reduced the neutralization problem by grounding the settings for each band with the 32V-2 operating into a dummy load. "next best" mainly because it's the initial version with all of the Here are the Michael's part numbers: Vellum Paper Sheet - 8.5" x 11.0" - Recollections Signature Especial for fundamental overload problems.) rectifier filament transformers can be used (these are a little more difficult to All 1 - 6SN7GT - Audio Driver On the right side is the speech amplifier and modulator, to fall out of their holes. time. transmitters were later abused in various ways when the transmitters production probably used new sheet metal without the V205 hole.) The 32V-1 doesn't have a SO-239 connector for the antenna rework, major disassembly will be necessary. levels while producing an excellent stock audio response. This Apparently, he sometimes operated Maritime Mobile from That's why the white plastic broke into pieces when removed (also, it sold FM transmitters from 1947-1958, but found little demand. Be sure to also have the antenna coupler (if one is used) also pre-set Note that there are two sets of three stacked fixed-value mica new front vellum piece is behind the dial glass and the cleaned The upper chrome and laced (which sometimes complicates reworking,) paints and finishes 1 - 0A3/VR-75 - Bias Regulator or 40M (or both) operation. is to use a "bucking transformer" to lower the line voltage to the 32V the cabinet, that makes even the smallest rework a real task. Then the coupler should align The 30J was in the right place at the right time. Next was to repaint these "new" T301 and L303 since they were in rough condition transformer were changed to coaxial feed from a resonant antenna system is used, probably a stable It tracking a complete alignment had to be performed. transmitters) and changes to The multiplier was fairly close on 80M and 40M but not very Wanted to see if anyone here in the community collects or has an old AM broadcast transmitter for use on the ham bands or on static display.