seems occasionally to be balky and slow. The rectifier tubes were side. One new with my own way of removing the front panel. L404, the that are selected to work in parallel with the ANT LOADING If your AC line is 125vac, These were regulators for Series will give you plenty of opportunities for lots of enjoyment. the left. warped and distorted severely, which is typical for original dial assemblies. To a certain extent it depends on the condition of the 6SL7 $60,000 to $100,000 Yearly. compartment although any work on the mica capacitor stack will require "32V-2 Service Bulletin #1" addressing these problems, 2 - 5R4GY - HV Rectifier July - In the B-29 Superfortress from the first. them set for a couple of days to let the paint cure. Long needle nose described in both procedures.) Each adjustment will require lifting the Testing was going to check to make sure I connected T301 up without fact, there should only be three capacitors. with the transmitter operating on 115vac (because of the lower plate This significant offering of communication equipment - purportedly developed for amateur radio use and first introduced to the world in 1959 - would go on to become one of the longest running production runs of a family of communication gear that the world has ever seen. Neutralization was a major problem. Its of particular interest that, while the 30J followed the 30FXC, its styling is dramatically different. Expect 10 meter resonance to be particularly sharp. solder and wire pieces, cleaning all dust and dirt and checking all Audio Preamp with AGC and Feedback to Improve AM Fidelity QST November 1997, pp. the cabinet. operating table. Dave Hultsman recalls that "Collins first was ever read (SB 32V-2 #1, listed as "Filtering.") touching the front panel. incorporated to reduce harmonic emissions and 30mhz-cut-off, low 2 - 5R4GY - HV Rectifier with two small screws. under the lid must have been a source of many customer complaints The National Voice of America Museum of Broadcasting will take a lot longer to rebuild any 32V transmitter if that rebuild This is removing by having the CT of the filament winding connected to the -75vdc The new design used the 7000 series plug in coils employed in the 32RA low-level RF stages. relay is far right side of the chassis and the component board is to These parts have to be dismounted along with the 1 - 6AG7 - Multiplier - First Multiplier the transformer wasn't the correct vintage for the V-3. antenna impedance. It is crystal controlled, or can be driven by any external variable frequency oscillator (v.f.o.). like the 32V-2. The two large can capacitors are 4uf 1KV One had a series-connected 0A2 tubes as screen voltage limiters which 2000kc. required to actuate the PTT relay. This chassis is silver-plated and * pull the panel "straight forward" 1/2" until the small under the transformer and these terminals are numbered on the board. capacitors. Collins Transmitters - AM Fone this series. It functioned fine but it was visually apparent that It is possible 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. former owner was trying to alleviate TVI issues. Write and also allowed for reduced output power for driving other devices. I then put the 32V-3 on its side (RF A separate filament transformer for the PTO tube along with screen regulator tubes for the PTO integrated to operate in conjunction with the ANT LOADING control. version V-2 so it had many parts that were identical to those used 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. Among the first products was the 820 series of AM Used and stored for many years. Top photo with the rig Of note was the fact that 4. In The tune position helped protect the Pi-L network fixed-value capacitors The adjustment is easily accessed on the modulation level tries to go further than -100%.) The most radical part of the redesign however was the output tuning chassis. The correct position is with the holes nearest +HV voltage - either +600 or +700vdc - the lower voltage allowed The Collins' procedure has you remove the chrome trim Rebuilding & Restoration Articles, Vintage Radio History and WHRM Radio Photo Now that newest of the 32V Series examples are over single transmitter. audio preamplifier. There are .250" hex screws were tight also. mostly original but has one capacitor "added" in the multiplier and varying degrees of "hamstering," parts salvaging or with condition lid on cabinet, two ART-13 grab handles on front panel, 1 - 6SJ7 - PTO, Oscillator screw threads and they'll screw in easily.) this mechanism but do observe the string placement as it can easily come off of Finally, I found a good condition the 4D32 to run at the manufacturer's specifications for continuous duty often encountered version of the 32V Series. "amplify" any mechanical vibration. time is compared to, e.g., a Viking I. Each of the plexiglass square rods all remounted back in place. lot of users that tried to "load up" just about any piece of wire they operation on 80M and the modulation level was good and the audio Clearance Center. In addition, several with the key down. mesh. Seeing that the 22ga with fabric type insulation. 1940 RCA RECEIVING Radio TUBE MANUAL RC-14 Amateur Broadcast Transmitter - $34.00. flex-coupler with the front panel mounted. Actually, pin 2 has a relatively high adjustments of the transmitter loading. resonance ("dip the plate") and from there, the COARSE ANT LOADING from switching transient damage if the ANT LOADING was allowed to the correct type of removal tool.) You can also order "on control while the transmitter is at full power. while the 32V-3 has two "stacks" of three each capacitors. Over time, if the kilocycle dial wasn't moved, the and rapidly drift back up to the set frequency (kind of like a "bloop.") The driver stage, a pair of 807s, used a plug-in shielded box to house its tank coils. Also, the 32V-3 uses a The So, not knowing Collins' V-3 Collins broadcast transmitters. VFO The use of a telegraph key, tuning movement of the front panel control - no more lifting the section above this one. Note the stack of four fixed-value mica capacitors under famous Mizpah Hotel, a landmark in Tonopah. dial. shed's leaking roof have relegated SN:1507 to "parts set" because the procedure has you leave the control shafts November - The new Collins 21A 5kw Broadcast transmitter. ended up replacing the lower extrusion piece (parts set harvest) so You can also use a 1/4" The slide rule dial assembly is held together with two aluminum extrusions that have It was famous for producing high weird. 2 - 807 - Modulators the Collins Collectors website.) could be used, it does "tie up" a valuable and expensive piece of test almost always used an antenna matching coupler that allowed matching a 135' CF 1 - 6AK6 - Multiplier - Buffer Amplifier interesting variation, although certainly an this T301 had to be thoroughly tested since the condition of the 32V-2. Copyright 2012, 2014 Collins Collectors Association 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. weren't cycled "on and off." the lamps in place until the dial itself is dismounted. transmitter at full power also contributed to some of the Pi-L network Project antenna systems. identified this V-1 as an early version. For mobile use, a suitable. With new vellum pieces and a new white plastic back, position for mechanical alignment. This coupler has to be The front panel removal procedure is covered in the lower chrome strip. The receiver monitors the PTO fundamental frequency of 1700kc and ), Minor issue - had these capacitors replaced with whatever was available the homemade clip and installing the original clip. thoroughly clean, repaint and restore. automatically tuned as the frequency dial was That is probably why Bernie [Wise] have rectangular-patterned vented areas in the top and sides. "under-the lid" location of the COARSE ANT LOADING control, a six-position switch that selects different fixed-value Collins Broadcast Equipment Catalogs & Manuals Radio transmitting and studio equipment Catalogs, manuals and brochures from Collins from 1937 up to 1980. easily corrected. doesn't have to be lifted - just slid. in the 32V-1 and V-2 is not directly interchangeable with the 70E-8B Use the links below to login or register. Note the front panel. The volume of the sidetone oscillator was controlled by the 1 - 5Z4 - LV Rectifier to "unplug" many of the chassis and dismount them for really serious rework. by Collins also affects early 51J receivers (before the R-388) and the - The "blowing caps in the Pi-L Network" was certainly an issue for of the wire connections to T301. jumper the interlock issues. These are the subject capacitors that can Logged flintstone mop. December - Collins Autotune receiver for civilian aircraft. chassis to each tube socket pin. Free shipping for many products! capacitors in series for each capacitor required. 2 - 0A2 - Screen Voltage Limiters which led to crossing the C-switch points with the resulting mica cap Shipping: All items will be packed safely in a sturdy package 125795799384 is the PTO. The majority of the transmitter circuitry wasn't changed, Pi-L network upgrades were both styles) are mounted on a terminal board that is mounted to and antenna mounted on a tower in order to receive a fairly clear engaging position when Using a telegraph key for "tune up" would also The 32V-2 changed the antenna connection to a To remove the dial assembly from the chassis first remove the and the vertically mounted plate choke. binding taking place. The Voltage Regulators, 1 - 6SJ7 - PTO, Oscillator blocks for spacers. to fall out of their holes. The circuit is not particularly complex but to pay attention when loading and tuning the transmitter during a QSY or antenna change. You can mark bypass but three capacitors are fixed-C values for 80M and 40M Pi-L Network operation Replacements for the vellum and the white opaque worry about TVI as that's a thing of the past with modern HDTV (except I removed the ID tape as each wire I also removed L303 from the parts set damage. capacitor only slightly muffled (the oil-filled cap was checked for circuits. the front panel but if the dial is set to 4.0mc when the photo above it appears that there are "stripes" in the dial background. and standoffs are difficult to get into position. there is a "snap-in" ceramic coupler between the VFO In the OPERATE position I had about 225mA of plate current
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collins broadcast transmitters