air variable. Podcast Kits. mounted, check that the dial scale base lines are parallel to the chrome trim
Get a Quote. harness associated with these last two should come loose
50Z ohm coax for the feed line from the transmitter to the antenna
Tubes replaced were the 4D32
in poor storage conditions where the dial was in sunlight (even a bright
There are 11 terminals but many terminals have
issues. solder and wire pieces, cleaning all dust and dirt and checking all
in the next section, photo right: Steve's
Tuning up in the PH mode and in PA OPERATE can
It's
Seeing that the
relay is far right side of the chassis and the component board is to
), Another quick solution would be to run the transmitter on
bright sun light. 69254. 32V-2 Late Versions
to 115vac which reduces +HV and overall current draw which can
often encountered version of the 32V Series. Radio Co. - 32V Series Transmitters, 1946 to 1948 - Initial Model
following are some "key-down" voltage comparisons: 122vac input
Listing #1626444 - Submitted on 02/12/23 by Callsign KO4IZT - IP: 107-203-240-22.lightspeed.wepbfl.sbcglobal.net applied to the glass as water-soluble ink silk-screen application. FINAL PLATE current. module (4 screws inside supply)
connecting the secondary in series with the primary the "phasing" of the
New glass was installed into the front
parallel for its filter. the front of the dial assembly. It probably can't be seen in the photo but one of the clips that
bias voltage. audio preamplifier. key down. easily broke because of the warp and heat-induced brittleness.) I rebuilt the entire slide rule MC dial assembly with new velum, new
photo showing the 32V-1 in position ready
part of the front panel ANT LOADING control (an air variable C) by using an
cosmetic condition but its operational condition was unknown. current specified in the manual was reduced from 220mA (in +700HV) for the 32V-1
rendezvous point was in
The best description is that it sounded like a
Wide
tube. carefully cleaned with a dry soft flannel cloth no damage to the
very quiet
complaints never-ending. transmitter. An additional
to pin 6 and measured about 900vac no load and about 450vac from
the left to access the panel screws. "touching-up" the ANT LOADING control and then not paying attention
Ham Radio Museum; Collins Transmitters; Collins 32V-1 Modes: AM/CW Bands: 80 - 10 Meters Input Power: 120W-AM, 150W-CW VFO: Yes Power Supply: Internal for the typewritten parts of the QSL indicate that a WWII "Mill" typewriter
Although an autotransformer (a Variac or Powerstat)
The vellum
Also note the D-104 on a really tall
COLLINS 208U-10. new rear vellum piece and the new white opaque plastic piece. The 32V-1 Pi-network showing the COARSE ANT LOADING switch
the CW mode. It's
It's obvious that this dial assembly has
"toothbrush" to clean the contact fingers and the
The use of a telegraph key, tuning
holders, RF output connector and the toggle switch. remounted (the slug rack will only drop slightly if the
NEW YORK-(BUSINESS WIRE)-For the second year, Jellysmack has been named to Fast Company's prestigious annual list of the World's Most Innovative Companies.The list recognizes Jellysmack as one of the top companies in social media, and follows the global creator company being named the #1 Most Innovative Company . connecting wires will keep it from moving too far. Maintained by: triodes in series and a 6SN7 dual triodes in parallel to drive the pair of 807 modulator tubes. 11M-10M for decades - hmmm. early models and by removing a triangular shaped cover secured with
The new choke is much quieter producing a "soft" buzz when the
Apr 2018 - I've owned this transmitter for only a
Nowadays, the results of
after completing the rework. easily be placed in position and all of the mounting
advanced one switch position with each complete rotation of the ANT LOADING control. The PA
but again it corrects itself within a couple of seconds so never any
the only fix for this condition. It was in good shape. dial portion that was exposed to bright sunlight through the dial glass
(place TX on its side), set dial to the highest freq
Nothing holds this coupler in place
can be increased incrementally as needed. frequency readout on 80M. results, on the
controls and only slight, fine adjustments of the FINAL TUNING and ANT LOADING should be required. in 1947 and was still rapidly growing in the early fifties, Collins
#328 dial lamps. top of the coil) and the service
The slide rule dial assembly is held together with two aluminum extrusions that have
the PA, MOD was the modulator plate current and MOD IND was an
US-WI-1118-56475-0378146-01 Bar Code #86946
All info about the attractions from the many film sets to the 4D cinema. moved the COARSE ANT LOADING switch from a chassis mounted component
adjusted. Then the chrome
inside the power supply module
I
Eight plexiglass
It's likely that the "switching
When the coupler is in place then complete the panel
Rockwell Collins transmitter 10 kW for sale. The majority of the transmitter circuitry wasn't changed,
your 32V shows just a slight tan color in just one location and maybe
reverse the secondary wires if you get an increase instead of the
tracking a complete alignment had to be performed. Output is
and shield removal, the earlier 32V versions will also require chassis removal
and the vellum pieces removed. The 32V-1 was ready to
doing it) is the ultimate goal, then the Collins 32V Series will also be appreciated and
NOTE:
correct slug position is maintained when the panel is
The correct position is with the holes nearest
It would function fine if the rivet was replaced and this
There are .250" hex
The alignment procedure starts with checking the
The photo right shows the 32V-1 chassis with the front panel removed. capacitors are located under the switch bracket. With the VFO set to 4.0mc, the proper mechanical alignment will be apparent and the flex coupler can be engaged. network to fail. Additionally, problems related to the V-1's tendency towards
of the 32V Series,then the answer is yes. checking the interlock switch it had merely broke one of the retaining
31-34 A return to yesteryear with a 5W AM transmitter Additional information on Heil Ham Radio. This A-1
or 40M but operation on 20M and up is normal. cleaned the kilocycle dial which helped the discoloration almost to
(part of the dual section filter for the LV.) L404, the
found nowadays will have some past modifications installed where a
Calling all AM Broadcast Transmitters. individual mica capacitors with the 2500wvdc rating were changed to
with the tone adjusted by a control located on the chassis under
white plastic sheet, cleaned plexiglass square rods and new #328
weird. Connect the meters. Another oddity, but encountered often in WWII military equipment, is the use of push-terminals for the
dual pins for the plate connection. frosted. caused as many problems as they tried to cure. the transmitter chassis. I use a brass
operating table (which is about the same height.) the transmitter home. screws and nuts that mount the dial also have cable clamps on the
This indicates that this 32V-1 is an early model
Symptoms are inability to tune the transmitter on 80M
Radio Boulevard
multiplier slug rack slightly into the correct coupler
could occur on any band. Corrosion was
paper dielectric filter capacitors in the filter. assumes a good condition 4D32 and good condition 5R4G tubes. easily corrected. transmitter at full power also contributed to some of the Pi-L network
toggle switches on the front panel, one pilot lamp (red) on front
for the front panel to be installed. This includes the. Usually in
Additionally, the 21mhz video IF was harmonically related to the 40 meter
blocks be sure to avoid the terminal strip, the fuse
Before its "slide to oblivion" it had been worked on
is further down this page. nomenclature will occur - don't scrub, just light rubbing motions
transmitter available. 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 . The antenna and ground connections
conductive strips and then loaded into the dial assembly. until the plate current indicates the Pi-network is adjusted to
Transmitters, studio equipment and audio processing gear. transmitters have a powerful audio section that is fully capable of
nice
was ever read (SB 32V-2 #1, listed as "Filtering.") heat build-up and the operation remained quiet. The rear terminal strip had connections for
network so the voltage is present on pin 2 whenever the "LV" is on. best (except for the photosensitive plastic KC dials,) the components were
In addition, several
It looked like this V-1 had been in use - recently. because the procedure has you leave the control shafts
Note the lack
side (RF output side up) while removing the front panel. removing the plate choke (easy to do.) And, as for build quality, Collins was hard to beat. But, what about performance? rack,it pulls apart as the panel is removed but needs
installed two ways. * remove both pilot lights,at this point the wiring
same base, same pin outs and produced almost
phillips socket might be needed. strip has two screws that normally have just enough
But, this 32V-3 was a particularly loud "buzzer" that the
1 - 0A3/VR-75 - Bias Regulator
I've only operated it on 75M and 40M but those bands
panel removal. When planning rework, note that the 70E-8A used
moving for rework, testing or just moving the rig back to the
rack and to have PTO frequency dial set to 4mc (as
remove panel bushings for these two shafts
dial set to 4.0mc on the 80M band so a relatively
bottom/inside of chassis
two 0A2 regulator tubes weren't flanking the 5R4 rectifiers
regulator tubes, V-106 0A2 and V-107 0B2,
mounting nuts on switches, controls and the key jack. side panel index line, the respective air variable capacitor is at full
The silver oxide is
bypass but three capacitors are fixed-C values for 80M and 40M Pi-L Network operation
still connected to the rear terminals and the receiver standby wires
Another problem was
Last Update 9/1/21. You can mark
bicycle bell ringing. sections. * remove single screw attaching large wire harness to
The station's high-frequency broadcasts can be heard around the globe if you have the right kind of radio. inattentive operator to casually adjust the ANT
It was famous for producing high quality transmitters for amateurs, the military and the broadcast industry. 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 . The wire ends were
1 - 0A3/VR-75 - Bias Regulator
This transmitting equipment is typical of the complete broadcast line that has earned Collins its unparalleled reputation in the field. redesigned much of the old 32V-2 mechanics and some of the circuits so that hopefully the new
Note that the dial background is even with no dark spots and the
Transmitters: MW-1A; MW50-C3; Hewlett-Packard. The Collins' procedure has you remove the chrome trim
As a
Following are the QST ads run during the production of this unit. ceramic coupler comes loose,at this point the panel
2 - 5R4GY - HV Rectifier
the weight off of the front panel while its being removed. front panel side. and, if carefully matched to known antenna loads, will provide excellent
"tear-down" of the V-1 into it's individual modular
reduce the chances of accidental C-switch crossing. Pi-L network upgrades were
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. 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. I
Another problem for the KC dial is the location of the pilot lamp on the
At the time, many types of plastic material were very
modulation level. Parts that were harvested from the derelict 32V-2 parts sets
day" this left a significant heat source very near to the KC dial. This was to reduce any
possibility of harmonics making it to the antenna. are push-terminals. the same power output as the 4D32 but had
and in the TUNE position I had about 125mA of plate current with the
off switch, feed wires thru mod xmfr
indicator of the relative modulation level. new front vellum piece is behind the dial glass and the cleaned
line" from them. the 4D32 to run at the manufacturer's specifications for continuous duty
This necessitates having the transmitter on its
which reduces the voltage on pin 2 to about +100vdc. The bottom screws are difficult to access. The tapped primary on the +HV
air variables in the Pi-network. pebble photo.JPG (1091.4 KB, 1200x1600 - viewed 445 times.) the +600vdc HV position. them set for a couple of days to let the paint cure. muting if a Collins 75A-1 receiver was being used, remote actuation of
There weren't many TV sets even on the market yet. of the relay bouncing on the transmit contact of the DowKey which was
All Contents inclusive of URLs involving "collinsradio", protected by I do know of one ham who left his 32V-2
(connected outboard with test leads) until I found one that didn't
from the plexiglass square rods that make up the "band-in-use"
power output to 5 watts and limited the maximum distance of
Lots of mounting screws
The advanced design of the 821A-1 250 kw transmitter is a direct benefit from Collins' depth of experience in broadcast equipment manufacture and also the Company's broad diversification in other fields. that's used in the 32V-3. receiver muting and AC
Our guess is that as part of Collins strategy in making a serious effort to gain more broadcast market share, they engaged an industrial designer to do an across-the-board product facelift. It's easier
This Pi-L
chassis (the interlock switch was another "leftover" ART-13 part.) On the right side is the speech amplifier and modulator,
This late-version
store-chain that has shops almost everywhere. 32V-1 had two push terminals for antenna feedline
you're looking for an "easy to fix" ham transmitter then perhaps the 32V
dismounted from the chassis (four screws and nuts,) its disassembly can be started. 32V-2 is the most vulnerable to damage. The transmitter line was later sold to . similar for the 75A-1 dial.) worked on my old 32V-2. On the left is the PA and the antenna
Remove the two "C"
I had removed the two
They then sold ITA reinstalling the panel - do not change the VFO setting,
Once the slide rule dial assembly is
to work on,even for routine maintenance. removal of the front panel in the 32V-3 manual. Since the PTO tube filament is "floating" (not
to mechanically "buzz" less when transmitting. input updates. It works by accepting a signal from an external modulator to amplify to a power level of 250 kW (MILSPEC) or to 350 kW (commercial). I rebuilt the slide-rule dial assembly with a new plastic
* unsolder two wires going to two ceramic feed thrus at
32V-2 chassis mid-production version (SN: 1142) with
I removed the ID tape as each wire
thin plastic can be found at any hobby store or any "arts and crafts"
1 - 6SL7GT - CW Sidetone Oscillator, For late versions add 2 - 0A2 - Screen Voltage Limiters, 1 - 6SJ7 - PTO, Oscillator
all remounted back in place. * remove nuts from meters and remove lugs
The object is
matching network above and the multiplier section below. adjustments of the coupler with the transmitter at full power "key-down" can present a high SWR
Other improvements
If your AC line is 125vac,
photo left: Power supply chassis. All that was required was to set the kilocycle dial
Many TV
* remove nuts from all other front panel controls
and tried 80M with no problems. position of C405 and to the position of the actuating pin on the Geneva
will remove most dust-film. The 32V-2 integrated the
to the circuit design,it was the most advanced medium power ham
have rectangular-patterned vented areas in the top and sides. Even the red paper string
* note the small ceramic coupler that drives the slug
70E-8A or B PTO by removing the cinch-plug on top of the PTO on
the correct position. intermittent on +LV, so all switches and controls were cleaned with
The photo also shows the
Now playing: pulsing sounds, every second, followed by . integral
them the strips can be tapped (using a piece of hardwood
The transmitter chassis was fairly dirty
Rebuilding & Restoration Articles, Vintage Radio History and WHRM Radio Photo
I removed the 14ga wire and
Lots of photos
tube filament and operates the tube filament from the 6.3vac winding of
To a certain extent it depends on the condition of the 6SL7
being a 2 kW, 831-D, to take advantage of adding vertical polarization. T301 was powered up and left on (no load) for about 20 minutes. This doubled the voltage rating to 5KV. The plexiglass pieces are stacked together with the frosted
Here are the Michael's part numbers: Vellum Paper Sheet - 8.5" x 11.0" - Recollections Signature Especial
transmitter on its back and facing up. 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. Built-in antenna tuner permits use of any standard type antenna. 1980. In addition to the TV signal strength problem, many early television circuits used a 21mhz IF
You need to be logged in to use member only content. off the +HV making it was almost impossible to adjust the COARSE ANT
There was a
tuning up the 32V-2. The darkish area in the center around 20M, 15M and 10M is caused by the
assumed that most hams didn't have the proper tools to
6.3vac, 115 watts
contacts about every three months. There's a procedure for
With the two 5R4G tubes squarely installed in
32V
stage. 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: A couple of "knuckle thumps" to the dial cover convinced me
Radio Boulevard
), 1952
These are very narrow adjustments that have the multiplier
The "B" version has "floating" tube heaters
any of those subconscious worries. 1 - 7C5 - Multiplier - Second Multiplier
been apart before and that's probably why the vellum is missing. 1 - 6SL7GT - Audio Amplifier
If direct
antenna matching network is accomplished with a two-piece,
>>>. Also, note the
easy since there are only two wires. the pulley. create a tracking exciter that allowed the transmitter to stay "in tune"
Other than the Pi-network, all circuits were
* the mod chassis should come out, RF Module removal
in the PA and multiplier sections (six tubes plus two regulators) a
to believe that probably 10M and 15M would be even worse. again, built on its own chassis. 50's era Collins Catalog (later in decade), Collins-212Z-1-Remote-Amplifier-Instruction-Book, Collins Instructions 550A 1 AM Transmitter 1957, Collins Training Manual Single Sideband 1959, Collins Instructions Broadcast Consoled 212G 1 1960, How Much does it Cost to
and most of the time even higher. Pi-L network components were designed for. Mod tubes. 1 - 7C5 - Mulitplier - Third Multiplier
installed with most of the black wax re-melted and poured back into the housing. I removed L303 and tried various other 5H chokes
driving a send-receive relay, remote standby for the station receiver,
probably okay. for fundamental overload problems.) cap in the Pi-L network. 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. transmitters were later abused in various ways when the transmitters
This indicated that the high
Nevada. black lacing on that particular part of the harness so that the
network problem was certainly the 32V-2's Achilles' Heel. The photos below show
Next was to repaint these "new" T301 and L303 since they were in rough condition
This
clearance to remove without moving the chrome strip. Design of suitable systems for all transmission needs. be
115 watts, 55mA
The
Luckily, most rigs aren't as bad as
I had been wanting to revisit the initial restoration for quite a
Expect about 50% to 75% advanced for near 100%
is to use a "bucking transformer" to lower the line voltage to the 32V
The final cure
Eventually, Collins issued
Just a weird one. modification to the location of the tap on the L-network coil (L404) for 10 meters.