1980. I had a couple of other DowKey relays that I could try. new 32V version featured several important improvements over its predecessor, the 32V-1. transformer) to have it "resting" in the proper
seem to have somewhat diverse opinions about the 32V Series is the mechanical design
in the early 1960s. Operation
work great. replaced it with a more original type of wire. 1 - 6SL7GT - CW Sidetone Oscillator
will take a lot longer to rebuild any 32V transmitter if that rebuild
of the 32V Series,then the answer is yes. of the design of the fully enclosed cabinet and all of the extra shielding, screws and mounts for the shields tend to
But then, when comparing the end
Modulator added (very late 32V-1 transmitters did add two
The PTT relay, the component board, the
Since only 6.3vac is in the AC input, the VA rating of the transformer
40 meter amateur bands. externally. Since panel dismounting will allow misalignment
The driver stage, a pair of 807s, used a plug-in shielded box to house its tank coils. Huge sales of TV
36 Since the PTO tube filament is "floating" (not
It's obvious that this dial assembly has
easily be placed in position and all of the mounting
Too many questionable ham callsigns
Contributing Member Offline Meters
Checked modulator bias and
1940 RCA RECEIVING Radio TUBE MANUAL RC-14 Amateur Broadcast Transmitter The dial fiducial
of the interconnecting cables an easy task. You
The slide rule dial assembly is held together with two aluminum extrusions that have
From the time that the 32V transmitters were first
I
change is deep into the material and can't be removed. Tube
Bavaria Filmstadt near Munich is one of the largest film studios in Europe. Buy and Sell - The Broadcasters Desktop Resource Series. The PA tube was a Raytheon 4D32. Collins 300J and the 550. front panel side. key down. If these screws
The RF deck underwent a complete redesign. Can be sold as-is; contact us to discuss this option. What Can be Accomplished
N-connector bracket to access T301 and L303 mounting screws. thin plastic can be found at any hobby store or any "arts and crafts"
found it set to 100mA which is about double where it should be. solder and wire pieces, cleaning all dust and dirt and checking all
are tight they tend to make the chassis vibration resonate more in the
key is not installed in the key jack. automatically tuned as the frequency dial was
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. rack cam has to be hand-moved into position for the flex coupler to
relation to the knob index positions before and after
This is the most
front panel. Next was to repaint these "new" T301 and L303 since they were in rough condition
It should have been moved to turn 8 if the service bulletin
the ratio and the secondary voltage. commercially-built ham
can be relatively small. one contact in years of using the transmitter ever mention the
match (low SWR) would be present at all times. Here is a former broadcast transmitter rescued from a local AM station that has gone solid state. 32V-1 and the same location of the KC dial lamp for the 32V-2 and V-3. located on the rear chassis panel. levels. When moving
removed them and left the shafts secured in the
Replacements for the vellum and the white opaque
can't respond fast enough to indicate modulation levels accurately. increased the turns ratio for the higher secondary voltage. to mechanically "buzz" less when transmitting. The old choke was melted out of the housing and the new choke
1 - 4D32 - RF Power Amplifier
socket set with phillips head fitting, a universal
A plate-modulated AM transmitter must develop audio power nearly equal to 78 percent of the RF carrier power to achieve 100 percent modulation. The +LV used a 5Z4 rectifier and
The two units were ready to install but I let
All that was required of the operator was
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. Collins Radio Co., Brochures - Collins Aerospace Museum break at the El Capitan in Hawthorne, Nevada, Tom and I were back at our respective homes by
applied to the glass as water-soluble ink silk-screen application. Note the missing SN tag. paper dielectric filter capacitors in the filter. The unit measures 60 high, 20 wide, and 13 deep and weighs 386 pounds. On the bench, out of the cabinet and with the perf-metal covers
connected a dummy load. installation. 3. and standoffs are difficult to get into position. actuation string and spring can be seen. front panel is mounted. Check value of C305 but it's
photo above:
panel to complete the
At least no holes were drilled for this "hamsterepair." are now the correct vintage parts. I checked the LV rectifier tube socket, pin 4
It's very easy to "over-modulate" the carrier. It might also be a good idea to log all of the
However, twice
Thanks to Steve Pazar W6SSP for contributing his 32V
The Collins 30J Series Amateur Transmitters A Restoration Journey.. Resulting in a Great 30J to 30J Contact. and shield removal, the earlier 32V versions will also require chassis removal
Collins Equipment Archive - Oldradio clips on the ANT LOADING and FINAL TUNING shafts (use
were mounted on
There's a procedure for
It was in good shape. late-1946 through mid-1948, or just under two years of production. Pi-L network used in the 32V-2 had its share of problems. Collins - MCRN Home 1 - 6SN7GT - Audio Driver
and 500 kW. hardware. over edge of bench)
to allow the use of a remote switch that allowed the tube heaters to
The
C-switch operation should begin at about 230
guided into position and engage to flex coupler. assures good grounding and certainly makes any routine tube checking
The correct position is with the holes nearest
* remove all knobs
own chassis. which reduces the voltage on pin 2 to about +100vdc. feed line. - Introduced in 1952, the 32V-3 was the last of the
is further down this page. this mechanism but do observe the string placement as it can easily come off of
I did note that the calibration
HP-333A/334A - Distortion meter; HP-8406A - Frequency Comb Generator Humor. However, the original types of
section above this one. That's why the white plastic broke into pieces when removed (also, it
>>>. adjustments of the coupler with the transmitter at full power "key-down" can present a high SWR
switch if they wanted to defeat the obvious benefit the interlock
Dallas, TX, as Rockwell-Collins. Once the flex coupler is installed,
all upper case and the characteristic "curled-top C." Unfortunately, no
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. were excellent. following are some "key-down" voltage comparisons: 122vac input
Also note the D-104 on a really tall
Covenas, Columbia, South America with W2YDU. I probably replaced a tube or two. My Cart (0) (800) 426-8434 Call the GearHeads! screwdriver to access the bottom two screws. A 5A 6.3vac secondary (~600 watts at 115vac) would be
index relationship to the ANT LOADING index scale and then to the
on the small chassis directly behind the PTO where the
of 807s. 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. But, what about performance? "TUNE-OPERATE" toggle switch in the position where the green
afternoon. remounted (the slug rack will only drop slightly if the
a balanced output - it is the unbalanced output from the Pi-network. incredible restoration was time-consuming the results speak for
could find and didn't use Collins' antenna designs that were provided in
dummy load was connected and the 32V-1 powered up. 69254. cause. drive external loads. originally came with a red paper-string tag attached to the COARSE ANT
Another oddity, but encountered often in WWII military equipment, is the use of push-terminals for the
changed from a SO-239 UHF coax connector used in the 32V-2 to a Type-N connector. 1 - 5Z4 - LV Rectifier
each shaft piece. contacts.) Collins
A 6SL7 acted as the sidetone oscillator
A 6.3vac filament transformer is very easy to find
Testing was going to check to make sure I connected T301 up without
Replacement is
from 1946 - 1954, 1946 32V-1 Artwork from 1947 Ad in ARRL HB, Collins
(place TX on its side), set dial to the highest freq
The multiplier slug
* note the small ceramic coupler that drives the slug
When
The silver oxide is
reinstalling the panel - do not change the VFO setting,
line" from them. has to be individually cleaned with Glass Plus to assure good
WARNING: DO NOT USE
Also, replacement of the
1968, Collins Instructions 212V 1 Audio Console 1969, Collins Instructions 212J 1 Broadcast Audio Console
* remove nuts from all other front panel controls
and the transmitter would be loaded to around 180mA of plate
Upon removal,
New & Used Radio Equipment - BMI Surplus Listening to WWV at the source: Fort Collins, Colorado, USA Having a good parts source was certainly the major factor in
parts set was "challenged." Clean
I checked phone
This led to my laziness in leaving the 32V-2 in PA OPERATE and
But, almost always the white
ended up replacing the lower extrusion piece (parts set harvest) so
It's more noticeable on CW
quickly returns back to the set frequency in just a couple of
Though the manual doesn't specifically
"chassis-out-of-the-cabinet" job. bypass,
So, the slide rule dial assembly was rebuilt. Other updates included the 70E-8B PTO change (32V-1 and V-2 used the
Citizen's Band operators (illegal because the FCC regulations limited maximum
and the vertically mounted plate choke. Most
The new design used the 7000 series plug in coils employed in the 32RA low-level RF stages. Bulletin #1. Photo right shows the 32V-3 chassis
of the wire connections to T301. turning a dark brownish-red color. only differences between the Collins procedure and how I
The QSL indicates his antenna was a "LONG WIRE." The upper end tap had been on turn 11 of the inductor (counting from the
The
into the solid body of the broken rivet. inconvenience of having to access the COARSE ANT LOADING
But, this 32V-3 was a particularly loud "buzzer" that the
Shown to the right are all of the pieces to assemble the dial. +HV voltage - either +600 or +700vdc - the lower voltage allowed
to worry about but then perhaps LED "nightlight" replacement bulbs might
most likely a subjective judgement but certainly the closer the AC line
Fortunately, I do have a 32V "parts set" that can donate
In 1977, Collins Radio Co. was bought by Rockwell and moved to SO-239 UHF adapter unless you would like to try making up a coaxial
which requires the user, when tuning the transmitter - especially into
* pull the panel "straight forward" 1/2" until the small
This will
assembly shown to the right was removed from the 32V-1 transmitter. I had removed the two
variable C for loading. Tubes replaced were the 4D32
32V-2 - Three
harmonics and spurious emissions inside the transmitter. To protect the chassis paint, install a
occur on either 80M or 40M. associated shafts come out with the front panel, do not
photo left: Top of the 32V-1 chassis showing the dense
the shafts, it's best to remove the "snap-in" ceramic coupler
Output is
the Collins 270G-1 loudspeaker. It's not
Another problem was
Just a weird one. The
The 32V-2 transmitters used five fixed-value mica capacitors in the Pi-L
of the rubber feet.) were also still connected. 30J Transmitter | Collinsradio Front panel removal has to be done with care since
I purchased
The use of a telegraph key, tuning
This is removing
what showed on the 'scope and was heard by the receiving stations on the
(reproductions were available at that time) so a repro KC dial was
toggle switches on front panel, two pilot lamps (green and red) on
32V-2 transmitter shown in this write-up since 1993, about 27 years. Permeability Tuned Oscillator, a PTO, as the VFO-Master Oscillator along
I soldered all
"touching-up" the ANT LOADING control and then not paying attention
owner from trying to install a PL-259 on the end of his coaxial
Usually, if the "buzz" is really annoying, a small
The price was $200, which I agreed to. Ten new #328 lamps were used in the dial rebuild. 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 The antenna and ground connections
Antique Radio Forums View topic - Calling all AM Broadcast Transmitters L404 and the 10M tap
An easy thing to try is to loosen
1 - 6AK6 - Multiplier - Buffer Amplifier
plate voltage is caused by L-303 and also that the HV power supply
Since the front panel was off which affects the multiplier
require using spacer blocks between the chassis and the bench top so as to take
1 - 7C5 - Multiplier - Second Multiplier
contacts on the auxiliary control relay. wires stayed in a bundle. transmitter at full power also contributed to some of the Pi-L network
COLLINS 208U-10. strip for the video. Brian, WB6QED. Ground VLF/LF Transmitters | Collins Aerospace 115 watts, 55mA
Collins Mechanical Filters Catalog Bulletin 1031A 22 pages. It turned out that the dial assembly had been worked on in the past
them set for a couple of days to let the paint cure. and other wires have to be moved around to access the mounting
just above the adjustment knob. "under-the lid" location of the COARSE ANT LOADING control, a six-position switch that selects different fixed-value
K4HV 160M Collins 20V-3 Transmitter . Great Savings & Free Delivery / Collection on many items procedure and with the V-2 manual not having one, I came up
identified this V-1 as an early version. went to Juan Chibrando's grounded grid triode design at CCA.". Reassembly was completed and the 32V-3 was now ready to use. * remove octal plug going to mod chassis that is located
bulletin indicated it should be moved to turn 8 for better tuning on
Try to use a NOS tube in that position. the plate choke. The plexiglass pieces are stacked together with the frosted
clip-in lamp fiberboard connectors. "interesting" quirks like the "under the lid" adjustment of the
"band-in-use" slide rule dial as the illumination (using the ten
COARSE ANT LOADING was a separate control switch that was located under the lid of
transmitter worked very well in CW. muting if a Collins 75A-1 receiver was being used, remote actuation of
Also, a weird lash-up using a
component layout of the design. Harmonic interference from ham transmitters was rampant and TV fan's
Use
We are presently logging some of the early products into a database. sure to check Pi-L network air variable C positions in
If using
The dial rebuilding procedure
In addition to this 32V-1, Steve also
solution to this condition. covers (which I'll probably have to fabricate. Listing #1626444 - Submitted on 02/12/23 by Callsign KO4IZT - IP: 107-203-240-22.lightspeed.wepbfl.sbcglobal.net correct meter readings and the carrier looked good on the 'scope. Later, when moving the
Symptoms are inability to tune the transmitter on 80M
actually bent. Watch the
C304) were changed to a single oil filled 8uf 1KV capacitor
Limiters as used in the later V-1s. This can damage the
upgrades to the Pi-L network, to the voltage regulation for the PTO
If you have read all of this and you are not looking for a 30J, you need to see a doctor. To see the Original 30J (30 Series) Transmitter Manual click here. I
down" (e.g., in AM w/o key in jack) while crossing the C-switching points
December - Collins Autotune receiver for civilian aircraft. (with NOS tube,) two 5R4G tubes and one 0A3 (VR-75.) The probability is good that the radio controlled atomic clocks placed on the west side of the school building (The side closer to Fort Collins, CO) will be able to pick up the WVBB broadcast. screws and nuts that mount the dial also have cable clamps on the
Broadcast line off to Continental Electronics as of 1/1/81. With the
procedure in the section above this one and observe the following details. condition of this V-1, a reasonable price was agreed upon and I took
Unbelievably, the two 5R4G rectifier tube envelopes were barely
located by the Pi-L network (on top of the
will hold the ceramic "snap-in" piece which then allows the front panel to be
be removedeven then harnesses
The dial was not replaced since repro
remove the plating. First, they were expensive,priced from around $575 to start (the 32V-1) and increasing to an
The vintage Crosley-built behemoths are long gone but you can still view one of the 1960s vintage Collins Radio transmitters on your tour. for the frequency of operation to provide close to a 1:1 SWR. It probably can't be seen in the photo but one of the clips that
front of the
on turn 11. 32V-1 SN:373 recently restored
Transmitters,
75A receiver. tube. Radio Controlled Atomic Clocks Problems No MORE? Click Here! upgrades included replacement of the defective HV oil-filled filter capacitors using "plug-in" can
the transmitter home. Original paperwork including Shively manuals and Hatfield & Dawson engineering study included. The V-1
by having the CT of the filament winding connected to the -75vdc
The right side meter was a
You can also order "on
side. points helps prevent damage to the Pi-L network in the V-2. upgrades were installed, one should still tune in the TUNE mode, use a known-Z, low reactance
flat-spring and wooden dowel held the rightside dial lamp power
mid-1948 and it featured several upgrades that tried to alleviate the
the transmitters out of the cabinet on any of the 32V series since
Collins 20v-2 Am Broadcast Transmitter on 75m Ve3ngw Florida LV filters had been mounted. tube filament transformer was only connected by one strand of wire. shields - lots of work that usually has the owner postponing necessary
The vellum
and, again, making any routine maintenance a
70E-8A or B PTO by removing the cinch-plug on top of the PTO on
reduced the ANT COARSE LOADING to 1 to start off. and cart machines used by radio stations. this series. series-connected 0A2 tubes as screen voltage limiters which
picture. In the OPERATE position I had about 225mA of plate current
Looking at the photo left, it can be seen
choke input filtering system will sometimes produce a mechanical
with Pi-L Network Issues. The style
Buy Ham & Amateur Radio Transmitters and get the best deals at the lowest prices on eBay! I kept hearing a "ringing" sound that strangely sounded like a
Also visible is the PA
each side, remove these 8 screws
Luckily, T301's terminals (on
The 30J was a general purpose transmitter designed for general applications such as police service, aeronautical ground stations, or general purpose point-to-point communications where service is intermittent. Announced in the November 1937 issue of QST, the ad stated Its Our Baby and We Love It. worry about TVI as that's a thing of the past with modern HDTV (except
connector. * remove two screws and lugs going to lid interlock shut
You can mark
seems occasionally to be balky and slow. together. Another
moving for rework, testing or just moving the rig back to the
match the antenna load and the transmitter is at full output power. antenna and use a telegraph key
because of the 32V-2 Pi-L network's vulnerability to damage from
the modulation transformer provided 60 watts of audio available to
cardboard wedge can be placed between L-303 and T-202 to reduce the
The power
Western Historic Radio Museum. band with <1kc error. regulator tubes. capacitors. Connect the meters. Collins Aerospace Museum, Products bands, modes or antennas frequently, this "lifting the lid" tuning
The 32V-2 isn't as well regulated as the later 32V-3. weren't cycled "on and off." should be removed carefully as the PTO/dial will be
Even if the 32V-3
The 208U-10 transportable unit is 69 inches high, 39-3/4 inches wide, 27-1/4 inches deep, and weighs 1650 pounds. It also looked
Posted: over a month ago. L303 was
The new choke is much quieter producing a "soft" buzz when the
cabinet. significantly. An obvious improvement is the rebuilt slide rule MC dial
joint fitting and extension. 200mA (in +700HV) for the 32V-3. requires dismounting the chassis rear panel.). very much. deciding
Then, the two #328 dial lamp contact retainers can
is to use a "bucking transformer" to lower the line voltage to the 32V
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. dial. the front of the dial assembly. cap in the Pi-L network. a production run spanning four years, the 32V-2 is the most
Collins 20V-2 AM Broadcast Transmitter - Product Sheet 6.3vac, 115 watts
Museum, Medium Power Ham Band Transmitters
A
COURSE ANT
N-type connector for the RF output. transmitter lid to adjust the COARSE ANT LOADING. procedure requires a receiver with an accurately calibrated
unbalanced output which implies the use of coaxial cable for
ANT LOADING control. station and were trying to receive very weak TV
Always good audio reports on AM and T-9 on
correct vintage parts anyway. procedure must have seemed very inconvenient and overly awkward. Next, disconnect the wiring to the meter terminals
1. met up with the "V-2 seller" at the Mizpah at 10AM to complete the deal and, after a lunch
the PTO tube screen voltage. It had been listed on the West Coast 40M Swap Net and the info was relayed to
famous Mizpah Hotel, a landmark in Tonopah. to believe that probably 10M and 15M would be even worse. plexiglass square rods are behind the vellum. >>>
Were the 32V Series
I
The 829B had the
Write
connecting the secondary in series with the primary the "phasing" of the
The problem was a blown fixed value
That is probably why Bernie [Wise] Network. at least reduce) the harmonic RF emissions. To remove the dial assembly from the chassis first remove the
Collins 32S-3 Round Emblem Radio Transmitter (MCN 1466, excellent cosmetics) (1) $1,100.00. Rockwell Collins - Alchetron, The Free Social Encyclopedia Lots of photos
I then wrapped
the cabinet. transmitter's design was more advanced than any other commercially-built
and in the TUNE position I had about 125mA of plate current with the
the removable sheet metal cover over the multiplier section. regarding the 32V-1. industry. The photo above
The same distinct Deco influence can also be seen on the Collins broadcast audio mixers and transmitters from about 1936 to 1938. ), photo above: T301 and L303
2 - 5R4GY - HV Rectifier
rebuild. The PTO and tuning dial will be separated from
minimal pressure on the connector so the lamps on that side would stay
The 32V-2 is subject to mica capacitor failure due to the upgrade that
In the center
reduce any hum on that source of bias voltage. With the 32V-2 or V-3, due to the turns
without rebuilding it. Shipping: All items will be packed safely in a sturdy package 125795799384 a better position to access. You are sick. while
studio equipment and audio processing gear. In my opinion (and it's just that,an opinion,) I'd rate the 32V-3
mounting screws finger tight first (hint: put one drop of 3-in-1 oil on the
that Collins issued a 32V-2 Service Bulletin #1 in 1956 that described a minor
position for mechanical alignment. to pay attention when loading and tuning the transmitter during a QSY or antenna change. Series of transmitters aren't for you. does essentially the same thing (well, not adjustable though.) assembly is virtually identical for all of the 32V Series (and it's very
As the LOADING air variable is rotated, each turn of the
accessed under the lid of the transmitter to a front panel control
The
Instead, just slide it to the right or to
were,the lower extrusion for the slide rule dial assembly,
pulling it off the shelf for examination of the rear it was noted
photo above: Face-shot of
If not, loosen the four screws that mount the dial assembly and
Note that the
but again it corrects itself within a couple of seconds so never any
was used throughout the oscillator and
removal of the front panel in the 32V-3 manual. However, on the positive side though,V-2s are usually the most reasonably priced version
* - This is a link to a site with the tone adjusted by a control located on the chassis under
It featured some of the
LOADING switch with the key down and the power on (although I suppose someone could
transmitter is at full output power.
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