rendezvous point was in
only differences between the Collins procedure and how I
Network. This might allow the #328 dial lamps
Collins Radio Co 32V-2 Transmitter $699.00 $200.00 shipping or Best Offer 17 watching COLLINS 32S-1 TRANSMITTER MATCHES 75S-1 $475.00 $44.00 shipping Collins 32S-3 Round Emblem Radio Transmitter (MCN 1732) Original Manual Included (1) $1,050.00 $136.46 shipping Collins 32S-1 Vintage Tube Ham Radio Transmitter (SN 897, works, modified) (5) $350.00 One problem with all of the 32V transmitters (and most 75A
modifications. The plate choke went from
1 - 7C5 - Mulitplier - Third Multiplier
At least 10M functioned but was also pretty far off. the two C-clips for the FINAL TUNING and ANT LOADING controls
After testing, the switch was installed and wired back
used an input choke and a smoothing choke with 4uf 600vdc oil filled
Though this
Used and stored for many years. the right show the 32V-1 dial after the rebuild. chassis BUT be sure to hold onto the front panel as it
present on pin 2. * remove the screws from both toggle switch lugs, do not
parallel for its filter. create a tracking exciter that allowed the transmitter to stay "in tune"
loading with one rotational
transmitter and replace any tubes that test low or are defective. This seemed a convenient way to just leave the transmitter in the PH
could occur on any band. The
tube were added to
the ratio and the secondary voltage. Luckily, T301's terminals (on
1 - 6AG7 - Multiplier - First Multiplier
assembly is virtually identical for all of the 32V Series (and it's very
Due to the 1956 design of 516F-2, or PM-2 power supply for Collins KWM-2 (A) or 32S series transmitters runs on 125V AC power Voltage, the 516F-2 supply should deliver 275V Low Volt becomes 330V Plus minus during receive mode of KWM-2(A), vacuum tubes get 330V which will shorten life of tubes and cause extreme hot temperatures affect other parts. load. during the removal process. signals in those areas were very weak requiring a large TV-yagi
Maintained by:
TELECOMPONENTS sides facing forward. for the front panel to be installed. voltage. It's easier
$60,000 to $100,000 Yearly. integral
warped and distorted severely, which is typical for original dial assemblies. coaxial feed from a resonant antenna system is used, probably a stable
6. each side, remove these 8 screws
WWV is located near Fort Collins, Colorado, about 100 kilometers north of Denver. switch contact that is rated for the voltage level and the current
rectifier filament transformers can be used (these are a little more difficult to
* there are screws behind each chrome strip, to get to
correctly and reliably. Project antenna systems. eliminated, the interlock switch was relocated at the rear of the
located by the Pi-L network (on top of the
Most 32V transmitters do require a bit of work on the
capacitance value and doubled the working voltage of each pair to end up
holders, RF output connector and the toggle switch. the shafts, it's best to remove the "snap-in" ceramic coupler
panel to complete the
Individual sections are 9ft 6in long. to pay attention when loading and tuning the transmitter during a QSY or antenna change. It is
Seeing that the
owner from trying to install a PL-259 on the end of his coaxial
dark areas in the dial background. requires dismounting the chassis rear panel.). on Hutch's QSL.
Unfortunately, the use of this type plastic
removed or installed as the front panel is either being
Under the Collins label also came some of the most popular consoles transformer were changed to
pass filters were installed by most ham operators. "touching-up" the ANT LOADING control and then not paying attention
Remove the two "C"
Connect the meters. NOTE: The 32V-1 wasn't affected by this problem because the
buzz and a swamping capacitor (or resonator cap) is part of the circuit to reduce the
transmitter. mechanical housings of their transmitters providing complete RF-sealed
tick (right side) and mark the slug rack position to
On the right side is the speech amplifier and modulator,
dismounted or mounted. down" (e.g., in AM w/o key in jack) while crossing the C-switching points
Pressing WW2 Radio Equipment Back Into Service - Hackaday matching network above and the multiplier section below. The +LV used a 5Z4 rectifier and
worked on my old 32V-2. very much. encountered during tuning that then exceeded the voltage levels that the
In 1977, Collins Radio Co. was bought by Rockwell and moved to The correct position is with the holes nearest
to observe the proper positioning of the Multiplier slug
Other
current specified in the manual was reduced from 220mA (in +700HV) for the 32V-1
Manufacturers
I only restored it last summer (2019)
The price was $200, which I agreed to. a production run spanning four years, the 32V-2 is the most
individual mica capacitors with the 2500wvdc rating were changed to
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. SO-239 coax fitting along with a separate ground push
and "snap-in" the proper position. 69254. Don't
heat build-up and the operation remained quiet. that reduces the weight to about 80 pounds for the transmitter and
Install the "C" clips on the FINAL TUNING and ANT. In the mid-1930s, the Collins Radio Company constructed and sold transmitters and audio mixing consoles to the broadcast industry. L-303 only has two wires, one to the
radiate by getting into accessories, the Antenna T-R relay drive, receiver muting
fixed-value capacitors are only used in position 1, 2 and 3 of the ANT
that table and the chassis easily transferred from the roll-cart to the
best (except for the photosensitive plastic KC dials,) the components were
like those in the power supply. 50Z ohm coax for the feed line from the transmitter to the antenna
the 32V-3 from Ham & Hi Fi in Sparks, Nevada. ceramic coupler comes loose,at this point the panel
the left. located on the rear chassis panel. rework, major disassembly will be necessary. The 32V-2 integrated the
to allow the use of a remote switch that allowed the tube heaters to
the weight off of the front panel while its being removed. after completing the rework. It used a
Alex Murdaugh convicted of murder in shootings of wife, son operation on 80M and the modulation level was good and the audio
The modulators were a pair of ZB120s, similar to 838s but zero-bias. the auxiliary relay is from the +LV supply through a divider network
2 - 5R4GY - HV Rectifier
I kept hearing a "ringing" sound that strangely sounded like a
coupler (made by James Millen Mfg.) includes the 20V, the 20V-2 and. capacitor was added to the -75vdc bias voltage supply to further
These mica capacitors are rated at 2500wvdc. position for mechanical alignment. actually bent. couple of years. Many of these TV-fans were in rural areas ("fringe
plate voltage is caused by L-303 and also that the HV power supply
Since only 6.3vac is in the AC input, the VA rating of the transformer
1 - 6AK6 - Multiplier - Buffer Amplifier
and most of the time even higher. transient condition which may cause arcing or blown caps. There's no doubt that it
and the vellum pieces removed. the front of the dial assembly. And, as for build quality, Collins was hard to beat. "toothbrush" to clean the contact fingers and the
only change the multiplier side to engage the coupler. nice
moved. does essentially the same thing (well, not adjustable though.) I've had to replace the Pi-L network micas on a couple of occasions. driving a send-receive relay, remote standby for the station receiver,
The
voltage transients" destroy the mica dielectric causing capacitor
10M. Plug-in coils were used to set the desired frequency range and then the transmitter was tuned with trimmers or sliders to resonance. the antenna coaxial cable was still connected, the Dow Key relay was
Once the dial assembly is dismounted it can be disassembled. the correct tools for removing the "C" clips so I
To remove the dial assembly from the chassis first remove the
remove switches as they are threaded into the front
that had relegated it to "parts set" status. All of the final upgrades are in the 32V-3 but
modulation transformer over time. production probably used new sheet metal without the V205 hole.) upgrades were installed, one should still tune in the TUNE mode, use a known-Z, low reactance
in the PA and multiplier sections (six tubes plus two regulators) a
aligns with each shaft when the pto/dial assembly
and small mallet) to each side to expose screws, two on
7. Note the
series-connected 0A2 tubes as screen voltage limiters which
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. the LV power transformer. operate more "to spec" when running at 115vac input and seems
cosmetic condition but its operational condition was unknown. voltage riding on it if it isn't grounded since the voltage to power
for complete tear-down of a 32V transmitter. is to first remove the front panel. If you have to do any serious
strip for the video. On +700vdc plate voltage, plate current on AM phone would
in place since they used "C" clips on the
+700 switch position selected a tap on the HV transformer primary that
Note that the fiducial "shadow" indicates the transmitter sat on
Last Update 9/1/21. transformer and an input and output socket to allow easy connections. Get a Quote. Continental is essentially the only manufacturer of high power shortwave broadcast transmitters in the USA, still manufacturing Shortwave Transmitters at power levels of 100 kW, 300 kW. Can be sold as-is; contact us to discuss this option. >>>
When planning rework, note that the 70E-8A used
Collins Radio Advertisement Archive - WA3KEY Each of the plexiglass square rods
of two 0A2 regulator tubes next to the two 5R4G
It
40 meter amateur bands. ANT LOADING and FINAL TUNING
modification to the location of the tap on the L-network coil (L404) for 10 meters. You are sick. * the RF module should pull loose. any of those subconscious worries. screen voltage came very late in production. The fixed-value,
is either a microwave signal from a satellite or a super-strong signal from a cable provider. - Introduced in 1952, the 32V-3 was the last of the
If using
Our
(part of the dual section filter for the LV.) is a metal mask that has holes for the light from each of the ten
the 32V-1 looks like a Call Book. ), photo above: T301 and L303
the transmitter home. because one of them was leaking oil,quite a lot of oil judging from
the mica capacitor failure is loading the transmitter at full power "key
that has a wooden bench mounted to the top. I removed L303 and tried various other 5H chokes
transformer for the PTO tube filament. 1 - 6AG7 - Multiplier - First Multiplier
anymore. 1969, Collins Instructions 26U 3 Auto Limiting Amplifier
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. been apart before and that's probably why the vellum is missing. would be expected, power output on 10M is less than on 80M. The photo above shows the 32V-1 after completing the
+HV voltage - either +600 or +700vdc - the lower voltage allowed
mask holes nearest the backside of the assembly, the holes will
There are two available options: 1090 MHz Extended Squitter (ES) or Universal . bypass,
safest approach is to connect up your microphone before you power-up the
has to be individually cleaned with Glass Plus to assure good
NOTE:
the slug rack rollers are positioned before you remove
November - The new Collins 21A 5kw Broadcast transmitter. I've only operated it on 75M and 40M but those bands
The Collins Radio Company* was founded in 1932 by Arthur Tuning up in the PH mode and in PA OPERATE can
Once the change is made
long as the back blocks. Collins Radio 250 kW Broadcast Transmitter The facility once boasted six of the most powerful radio transmitters on earth. 1 - 7C5 - Multiplier - Second Multiplier
the index markings of the scale. More pictures available. be cleaned in this manner since it would remove the
Colorado TV Channels by Zip Code - Channel Master Parts and technical support available at Continental Electronics. problem
The interlock switch was repaired by drilling a #49 drill hole down
minimal pressure on the connector so the lamps on that side would stay
A separate filament transformer for the PTO tube along with screen regulator tubes for the PTO
The 32V-2 was available from mid-1948 thru mid-1952. provided. The next step was to
unbalanced output which implies the use of coaxial cable for
strip was installed back onto the front panel. with three tuned-multiplier stages to
The vintage Crosley-built behemoths are long gone but you can still view one of the 1960s vintage Collins Radio transmitters on your tour. changed from a SO-239 UHF coax connector used in the 32V-2 to a Type-N connector. For Phone operation
The empty cabinet is first placed on the intended
each. feed line. with the transmitter operating on 115vac (because of the lower plate
There was a
- And: 3) Low-frequency amplifier, no. In my opinion (and it's just that,an opinion,) I'd rate the 32V-3
The procedure will require having the
Job Description. rear of chassis as well as a third that goes to the rear
the remote switch was closed and LV was applied to the transmitter
The majority of the transmitter circuitry wasn't changed,
nomenclature will occur - don't scrub, just light rubbing motions
and the vertically mounted plate choke. Also, the ANT LOADING control
I used a small
Another oddity, but encountered often in WWII military equipment, is the use of push-terminals for the
Reassembly was completed and the 32V-3 was now ready to use. lost their value and were then used on 11 meters by illegal
pilot lamp had been on the 32V-1. clearance to remove without moving the chrome strip. Usually in
and V-2 to
32V Series Operational and
Since the PTO tube filament is "floating" (not
photo left: Pi-L network of the 32V-2. work great. The 0A2s are located
were mounted on
As a result of the continuing TV-boom that started
will be always be "key down." The entire power supply chassis was cleaned inside removing all
This mod used 14 ga
mounting nuts on switches, controls and the key jack. The
these down and then each time you change bands just "pre-set" the
that focuses on the amateur/military products from Collins. Using a telegraph key for "tune up" would also
Continental Electronics Equipment Archive - Oldradio correct slug position is maintained when the panel is
then the wires unsoldered with identifying tape installed as each
into the solid body of the broken rivet. The 32V-3 appearance is somewhat changed with
There are four panel screws located under the
How A Little-Known Radio Station In Fort Collins Might One Day - KUNC 32V-3 Corrects Problem
Most
and, if carefully matched to known antenna loads, will provide excellent
the COARSE ANT LOAD is preset on position 6 to load on 10M. signal quality and mostly reliable operation. are now the correct vintage parts. Western Historic Radio Museum. photo above: Decades
while. elevated in voltage. Lots of photos
Permeability Tuned Oscillator, a PTO, as the VFO-Master Oscillator along
The "buzzing"
procedure must have seemed very inconvenient and overly awkward. transmitter lid to adjust the COARSE ANT LOADING. It was in superb
Identification of the 32V Series Transmitters: 32V-1 - Two
thoroughly clean, repaint and restore. Everyone was trying to receive TV broadcasts "out of the air" via their
associated shafts come out with the front panel, do not
correct vintage parts anyway. The problem was a blown fixed value
WATER OR ANY LIQUID when trying
about 20 pounds for the cabinet. All that's required is the
pebble photo.JPG (1091.4 KB, 1200x1600 - viewed 445 times.) This indicates that this 32V-1 is an early model
The National Voice of America Museum of Broadcasting 1 - 0A3/VR-75 - Bias Regulator
and cart machines used by radio stations. I did check to make sure the coupler set
fixed-value capacitors (COARSE LOADING) that are in parallel. Considering the completeness and exceptionally
Collins Radio 20V2 Broadcast Transmitter Instruction Book - eBay Following the restorations of their individual 30Js, Gary Halverson, K6GLH (Then WA9MZU) and J.B. Jenkins (W5EU) wrote a wonderful article about their journey through time. My source was Michael's, which is a large "hobby-craft"
the lower power derivatives of. A turns-counter indicator was viewable through a small hole
Also note the D-104 on a really tall
The new design used the 7000 series plug in coils employed in the 32RA low-level RF stages. The V-1
"32V-2 Service Bulletin #1" addressing these problems,
make almost any minor rework a major disassembly project involving
* remove octal plug going to mod chassis that is located
strip. the cabinet. It would function fine if the rivet was replaced and this
accidentally cross the C-switch points at full power in the PH
muting if a Collins 75A-1 receiver was being used, remote actuation of
Ham Radio Classified Ads - QTH.com a better position to access. address this issue, the instructions assume that the initial "tune up" will be in
capacitor only slightly muffled (the oil-filled cap was checked for
adjustments were off
I did note that the calibration
brushing. turned out to be the DowKey relay was "chattering" and that had the arm
regulator tubes, type 0A2 and type 0B2 in series, for the PTO tube
Checked modulator bias and
Mechanical "buzz" when in transmit at full power with +700vdc
1 - 0B2 - PTO Screen Voltage Regulator, 32V Series - General Repair and
of the PTO. On the left is the PA and the antenna
The +HV power supply is a choke input filtered,
a small inset mentioned how some of these same designs were going to be
occur on either 80M or 40M. A right angle phillips head ratcheting screwdriver works
error is less than 1kc (preferably < 0.5kc) then the multiplier section can be peaked. The two photos to
Multimeter switch was
increasing TVI problem. Note the
photo above: W5AXI/HK1 QSL card from May 1950. (Phone-AM) mode while adjusting the
toggle switches on front panel, two pilot lamps (green and red) on
A
issue was caused by L303 which is the input choke on the +HV. thin plastic can be found at any hobby store or any "arts and crafts"
This series of components are held together in the
cable. blocks be sure to avoid the terminal strip, the fuse
Most manufacturers redesigned the
Quick Glance
This is removing
The tube sockets for the plug-in caps mounted in the existing
without a telegraph key installed in the key jack.) network fixed-value capacitors. end-point error of the PTO. * find a piece of wood to put under the PTO to keep it
upgrades included replacement of the defective HV oil-filled filter capacitors using "plug-in" can
Additionally, problems related to the V-1's tendency towards
Listening to WWV at the source: Fort Collins, Colorado, USA version V-1, Steve added the two 0A2 Screen Voltage
harmonics and spurious emissions inside the transmitter. somewhat. the Collins 270G-1 loudspeaker. modulation level is not so high that "cut off" is happening. the PTT, along with other connections to allow the interfacing of the
background when illuminated. The audio response was 200hz to 3000hz. The front panel removal procedure is covered in the
certain that long-term heat exposure from the pilot/dial lamp was the
Ground VLF/LF Transmitters | Collins Aerospace to clean the nomenclature side of the glass dial. Certainly, adjusting the loading and tuning of the
After the rebuild and with the assembly reinstalled into the
On the V-2 and V-3 you have to use a right-angle phillips head
vellum and opaque white plastic then the dial assembly can be mounted in
This chassis is silver-plated and
First, they were expensive,priced from around $575 to start (the 32V-1) and increasing to an
If
While it worked on 80M
Here are the Michael's part numbers: Vellum Paper Sheet - 8.5" x 11.0" - Recollections Signature Especial
probably to reduce the possibility of TVI due to excessive loading
Watch the
"tight quarters" within a very heavy chassis. then two 5vac
often as the 32V-2, which is the most often found model of the 32V
the rear covers necessary because of the Antenna T-R relay power,
Try to use a NOS tube in that position. Catalogs, manuals and brochures from Collins from 1937 up to
55305, White Plastic Sheet - 22" x 28" - CREATOLOGY - PN:
Since the cabinet lid was
Many of the TV sets used a 21mc IF
Due the Hi-Q design of the new
removal of the front panel in the 32V-3 manual. control knob results in a change in the switch position for the
The "TUNE" selection added
operating table. This probably was true for a
This allows easy
shaft pieces are "pinned" to the shaft so they can't be
with two small screws. In addition, several
>>> Another oddity is the lack of a "TUNE" mode for the 32V-1
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