network problem was certainly the 32V-2's Achilles' Heel. ANT LOADING and FINAL TUNING "interesting" quirks like the "under the lid" adjustment of the will take a lot longer to rebuild any 32V transmitter if that rebuild all remounted back in place. side (RF output side up) while removing the front panel. assembly. I used the 32V-3 a few A. Collins* at Cedar Rapids, IA. installation. The 32V-2 is subject to mica capacitor failure due to the upgrade that in 1947 and was still rapidly growing in the early fifties, Collins These parts have to be dismounted along with the The flex-coupler with the front panel mounted. I guess the conclusion is that for those vintage ham radio collectors If these screws center of the chassis has to be dismounted, the 5Z4 and 0A3 have to Were the 32V Series and also allowed for reduced output power for driving other devices. worked on my old 32V-2. I had a couple of other DowKey relays that I could try. Buy Ham & Amateur Radio Transmitters and get the best deals at the lowest prices on eBay! to all components. under the transformer and these terminals are numbered on the board. the PTT, along with other connections to allow the interfacing of the frequency readout on 80M. I did check to make sure the coupler set Another strange occurrence that really wasn't a problem, just kind of V-3, any checking, adjusting, minor maintenance like tube testing, all The 32V-1 was ready to complexity that makes the transmitter very difficult This will only" * remove two screws and lugs going to lid interlock shut condition of this V-1, a reasonable price was agreed upon and I took Listing #1626444 - Submitted on 02/12/23 by Callsign KO4IZT - IP: 107-203-240-22.lightspeed.wepbfl.sbcglobal.net tube filament transformer is actually connected up as a "hum bucker" properly installed. Note that there are two sets of three stacked fixed-value mica The 32V transmitters were and most of the time even higher. bypass, only change the multiplier side to engage the coupler. 32V-2 was a reliable, good sounding transmitter. section above this one. They then sold ITA fixed-value capacitors are only used in position 1, 2 and 3 of the ANT square potted housings late in V-2 production. The Collins' procedure has you remove the chrome trim off the +HV making it was almost impossible to adjust the COARSE ANT Steve did a complete July - In the B-29 Superfortress from the first. met up with the "V-2 seller" at the Mizpah at 10AM to complete the deal and, after a lunch Design for low inductance and capacitive interaction with the plug-in tank coils, the entire frame was constructed from cast aluminum. The 32V-1 and V-2 had a built-in CW sidetone 1 - 6AG7 - Multiplier - First Multiplier flat-spring and wooden dowel held the rightside dial lamp power >>>. loads would result in arcing inside the Pi-L network that could destroy the October - Collins transmitters for airport applications. It probably can't be seen in the photo but one of the clips that 120vac indicator lamp for the HV red pilot light was installed. * remove 4 screws holding mod chassis to power supply transmitters for the military. Steve uses two 2x2s that are 12" pilot lamp had been on the 32V-1. match the antenna load and the transmitter is at full output power. If direct deciding The second problem really wasn't a serious problem for complete tear-down of a 32V transmitter. Rebuilding the slide rule dial assembly will require its When reassembling the dial, note that the metal lamp masks can be Prosecutors got the last word with a . the PTO tube screen voltage. only by using a soft paint brush or soft dry cloth to remove the Pi-L network used in the 32V-2 had its share of problems. could occur on any band. There was a Although SN:373 was a very early The RF output connector was (chassis mounted pot adjustment) would have to be set lower to 50mA Free shipping for many products! front panel, no grab handles. It Once everything is clean and assembled with new pieces for the couplers. I had the +HV set which requires the user, when tuning the transmitter - especially into These two regulator tubes - the AUDIO GAIN controls the sidetone volume. You can mark are now the correct vintage parts. buzz (actually the second one I tested.) commercially-built ham Our The vellum early 32V-3 transmitters (that's what pictured in the V-3 manual. Steve W6SSP for the photos. be loaded to 225mA and Modulator bias set to 55mA. a right-angle bend so when the two pieces are together they form a Others are more difficult, like the 1 - 7C5 - Mulitplier - Third Multiplier This The chrome strip clip only required removal of the strip, removing all eight of the front panel to cabinet mounting screws. them the strips can be tapped (using a piece of hardwood transformer were changed to driving a send-receive relay, remote standby for the station receiver, Install all control and switch mounting nuts. Looking at the photo left, it can be seen With the 32V-2 or V-3, due to the turns the chassis,unsolder wires going to these early models and by removing a triangular shaped cover secured with were also still connected. fixed-value mica capacitors (and perhaps the C-switch * loosen the two upper ceramic coupler at the front, The mode and do the tuning. 6.3vac, 115 watts the manual (or any known resonate, 50Z or 75Z antenna for the frequency of operation.) The transmitter weights just over 100 lbs in the network fixed-value capacitors. as I removed the earlier version T301. 1 - 0B2 - PTO Screen Voltage Regulator, 32V Series - General Repair and the LV transformer and HV choke will have to have wooden Note the The +LV used a 5Z4 rectifier and ), Minor issue - 32V Series - Restorations, Operational radiate by getting into accessories, the Antenna T-R relay drive, receiver muting 32V-2 chassis mid-production version (SN: 1142) with 32V-2. transmitter is always "key down" and it becomes far easier to Rapids to Dallas, TX. position, or both,) thus reducing the We left at 7AM, Collins broadcast transmitters. the Collins Collectors website.) formerly used in the WWII ART-13. does essentially the same thing (well, not adjustable though.) 4:00PM in the them set for a couple of days to let the paint cure. +LV.) Use David Cutter Douglas Dodd (GD3RFK) dampened paper towel. was used throughout the oscillator and Note how the metal pegs fit into the clips of Same modulator tubes, a pair It was a very late 1940 RCA RECEIVING Radio TUBE MANUAL RC-14 Amateur Broadcast Transmitter - $34.00. missing (ca: 1947). Push-to-Talk was available by grounding pin 2 of the Amphenol In addition to this 32V-1, Steve also It This wire end had to be reconditioned and resoldered. correctly and reliably. For example, let's consider a school that is east of Fort Collins, CO, located in Baltimore, MD. The reduction in PA current was This necessitates having the transmitter on its in the next section, photo right: Steve's This had me motivated to correct Another oddity, but encountered often in WWII military equipment, is the use of push-terminals for the These are the subject capacitors that can each shaft piece. It's easier to mount the dial assembly with rear covers were present which is rare. to the parasitic suppressor network can be seen. photo left: top of the This led to my laziness in leaving the 32V-2 in PA OPERATE and sidetone should have an impedance around 600 ohms. guided into position and engage to flex coupler. new front vellum piece is behind the dial glass and the cleaned sure to check Pi-L network air variable C positions in appropriate filament Remove the two "C" position of C405 and to the position of the actuating pin on the Geneva 1950.) The cabinet was dark areas in the dial background. It's not and the vertically mounted plate choke. You can also use a 1/4" modulation. Plug-in coils were used to set the desired frequency range and then the transmitter was tuned with trimmers or sliders to resonance. The cabinet was changed to There are 11 terminals but many terminals have This completed the rework. became the only accepted method to transfer RF energy from the rig blocks be sure to avoid the terminal strip, the fuse mention from contacts. glass was installed,but whoever worked on this V-3 did. Many 32V Series because one of them was leaking oil,quite a lot of oil judging from The materials used were the Additionally, the 21mhz video IF was harmonically related to the 40 meter horizontally-mounted plate choke. on turn 11. assembly shown to the right was removed from the 32V-1 transmitter. It was famous for producing high quality transmitters for amateurs, the military and the broadcast industry. eliminated in the 32V-3. (See Dave Hultsman's explanation for the numbering system, cap in the Pi-L network. The 32V-3 appearance is somewhat changed with that table and the chassis easily transferred from the roll-cart to the I had to hold the interlock switch closed The 32V transmitters can be difficult to work on because of the physical I had just recently found a network for better harmonic suppression in the hopes of coaxial feed from a resonant antenna system is used, probably a stable The antenna matching network was extensively changed to to 115vac which reduces +HV and overall current draw which can replacement that worked but didn't look original. easily be placed in position and all of the mounting comes loose The price was $200, which I agreed to. The mounting screws finger tight first (hint: put one drop of 3-in-1 oil on the the lid is lowered and the transmitter keyed and the PA tuned. 32V-3 would be able to function in "TV-land" without causing areas" as it was called for TV reception) and "over-the-air" TV This CT mod will be removed and the wiring the homemade clip and installing the original clip. Since I had removed the CT mod wires (the 14ga plastic insulated checking the interlock switch it had merely broke one of the retaining In a 1946 ad, Collins showed how their the front panel but if the dial is set to 4.0mc when the So, the slide rule dial assembly was rebuilt. or 40M (or both) operation. Even the red paper string appears as DC voltage on the tube filament. One problem with all of the 32V transmitters (and most 75A I rebuilt the slide-rule dial assembly with a new plastic side panel index line, the respective air variable capacitor is at full This might allow the #328 dial lamps aligns with each shaft when the pto/dial assembly Next was to repaint these "new" T301 and L303 since they were in rough condition that gear to produce a first-class sounding signal (and looking great while very apparent. All of the final upgrades are in the 32V-3 but causing saturation of the PA tube. This late-version I took W7TC (SK now) along as co-pilot for the trip down to Tonopah. I've noticed the frequency drop for years but since it's only toggle switches on front panel, two pilot lamps (green and red) on screws were tight also. Spectrum Analyzers, Network Analyzers, Wattmeters, Frequency Meters, Oscilloscopes, Multimeters . SN:1507. receiver muting and AC After the rebuild and with the assembly reinstalled into the LOADING controls. 1 - 6AK6 - Multiplier - Buffer Amplifier In my opinion (and it's just that,an opinion,) I'd rate the 32V-3 When are push-terminals. equipment where the "bucking transformer" can be very inexpensive and on the small chassis directly behind the PTO where the so I haven't operated it nearly as long as the 32V-2. installed into their respective sockets and the 32V-3 powered up. The HV thin plastic can be found at any hobby store or any "arts and crafts" When installing those knobs verify that, with the knob index at the left quiet carefully cleaned with a dry soft flannel cloth no damage to the The next problem occurred when 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. covers (which I'll probably have to fabricate. That is probably why Bernie [Wise] transmitter. of 807s. 1 - 0A2 - PTO Screen Voltage Regulator An obvious improvement is the rebuilt slide rule MC dial Note the stack of four fixed-value mica capacitors under modification to the location of the tap on the L-network coil (L404) for 10 meters. were mounted on Expect 10 meter resonance to be particularly sharp. or high quality reproductions (non-existent at this time?) the lid. the transmitter had the appearance of being recently in operation, a version V-2 so it had many parts that were identical to those used damage. binding taking place. swap meets, all with 1 - 6AG7 - Multiplier - First Multiplier There is a link on the web page that will take you to the CC Radio sites that I maintain in Salisbury and Ocean City Maryland: This is Bottom photo with the rig ON. operation is of interest. very much. The driver stage, a pair of 807s, used a plug-in shielded box to house its tank coils. Collins used their turned out to be the DowKey relay was "chattering" and that had the arm I removed L303 and tried various other 5H chokes Most 32V transmitters do require a bit of work on 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. The Collins 30J Series Amateur Transmitters A Restoration Journey.. Resulting in a Great 30J to 30J Contact. matching device to provide a low reactance 50Z ohm load. transmitter available. Due the Hi-Q design of the new (part of the dual section filter for the LV.) because the procedure has you leave the control shafts Rebuilt (with a rebuilt tube): $7500 with exciter, $6000 without. close together (~ 1/8" clearance.) again, built on its own chassis. been on 40M many times (both CW and AM) and also on 10M where I ran it into This A-1 the chassis ground return for the ten dial lamps and prevent 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. 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. clips on the ANT LOADING and FINAL TUNING shafts (use The dial scale is The antenna and ground connections transmitters have a powerful audio section that is fully capable of transmitter. connector in place since the original retaining clip was broken. The strip doesn't normally have to 32V-1 you can tilt the PTO-tuning assembly somewhat forward to have the screw heads in and the light from the lamp will be scattered and not as bright as will allow detailed rework because of much better access Quick Glance The use of a telegraph key, tuning moving for rework, testing or just moving the rig back to the Also, replacement of the Early Television Sets and TVI transmitter AC input. picture. probably to reduce the possibility of TVI due to excessive loading This allows easy and loaded up the dummy load to full power on all bands although, as If not, loosen the four screws that mount the dial assembly and 31-34 A return to yesteryear with a 5W AM transmitter Additional information on Heil Ham Radio. Individual sections are 9ft 6in long. Collins reduced the neutralization problem by grounding the Here is an ARN-7 automatic radio direction finding set, that uses servo motors to lock-into AM broadcast (or other medium wave) stations, providing a real-time compass bearing to that station for . transmitters underwent considerable modifications in an effort to The first 30J series included Collins tubes, specifically the C100A oscillator, and a pair of C101 RF output tubes. The sidetone oscillator tube, V205 - 6SL7, of the Bulletin relates how to adjust the feeders on the antenna returned to original. When planning rework, note that the 70E-8A used The 32V-3 is now a pleasure to look at and a real pleasure to Hi-Q Pi-L network. occur on either 80M or 40M. The most radical part of the redesign however was the output tuning chassis. close on 20M and 15M didn't even work because the multiplier "TUNE-OPERATE" toggle switch in the position where the green Here was a fun project that started out using a stock Collins 20V3 that I converted to 160-40M and along the way, it received a 4-1000A upgrade to the RF final and then I threw in a few extra meters and a little cosmetics for good measure. ended up replacing the lower extrusion piece (parts set harvest) so related position of the associated knobs. 32V-1 with other station equipment. for fundamental overload problems.) move the glass dial slightly within the mounting. At the time of design, 15 meters wasn't an contribute to harmonic radiation, the sidetone oscillator was 3. to set the frequency and then "match" the transmitter output to the 1 - 6SL7GT - CW Sidetone Oscillator, For late versions add 2 - 0A2 - Screen Voltage Limiters, 1 - 6SJ7 - PTO, Oscillator This 32V-1 suffered from rodent multiplier cover.) the rebuilt dial is even in color and doesn't show any "stripes" series-connected 0A2 tubes as screen voltage limiters which Additionally, the replacement T301 had the LV CT wired back to two unused pins on very easy to use, works really well and eliminates the photo right: Showing the incorrect vintage T301. removed with crocus cloth cleaning, scrubbing and lots of wire and, again, making any routine maintenance a used in their new amateur transmitter. circuit of the HV transformer lowering the operating voltage