The chrome strip clip only required removal of the strip, removing
adjustments of the coupler with the transmitter at full power "key-down" can present a high SWR
a right-angle bend so when the two pieces are together they form a
all upper case and the characteristic "curled-top C." Unfortunately, no
vellum and opaque white plastic then the dial assembly can be mounted in
appears as DC voltage on the tube filament. changes mentioned so far were mainly for TVI reduction. 1993 - I've owned the
Since panel dismounting will allow misalignment
Here is a former broadcast transmitter rescued from a local AM station that has gone solid state. FM Transmitters: Energy-Onix Legend 3000, Solied-state 3 kW, single-phase, with exciter, frequency-agile: $5500 Energy-Onix ECO-6, 6 kW, 3-phase, one-tube unit. I've blown one or more of the mica caps in the Pi-L network. As the LOADING air variable is rotated, each turn of the
While it worked on 80M
At 80 pounds out of
that are selected to work in parallel with the ANT LOADING
air variables in the Pi-network. mechanical housings of their transmitters providing complete RF-sealed
the transmitter had the appearance of being recently in operation, a
* remove the screws (4) holding the dial and PTO to
My Cart (0) (800) 426-8434 Call the GearHeads! Power output (with NOS
were mounted on
K4HV 160M Collins 20V-3 Transmitter . illuminated. Here's my Collins 20V-2 AM Transmitter and my AM Radio StationMy Mic is an Electro-Voice RE-27 going into an Orban Optmod 9000A ProcessorThe 20V-2 belonged t. still connected to the rear terminals and the receiver standby wires
Most vintage gear operators
* there are two small ceramic feed thrus at the rear of
My source was Michael's, which is a large "hobby-craft"
This. Bulletin #1. Built-in antenna tuner permits use of any standard type antenna. under the lid must have been a source of many customer complaints
but be sure to note positions of ANT LOADING and FINAL
Another strange occurrence that really wasn't a problem, just kind of
In 1964, Collins moved the Broadcast Division from Cedar The clips in the multiplier side of the coupler
The equipment is 69 inches high, 42-9/16 inches wide, 29-29/32 inches deep, and weighs 1780 pounds. The 32V-2 added a reduced power
to all components. best for access the back screws but also a 1/4" socket wrench with a
adjustments for the L and ceramic trimmers for the C. The manual's
Each module was tested individually before
So different, in fact, that (our opinion) there has never been a prettier Collins transmitter. The Collins Radio Company* was founded in 1932 by Arthur mechanical alignment as the panel is tightened to make sure there's no
mounted, check that the dial scale base lines are parallel to the chrome trim
The RF output connector was
Steve uses two 2x2s that are 12"
An examination
(with NOS tube,) two 5R4G tubes and one 0A3 (VR-75.) "TUNE-OPERATE" toggle switch in the position where the green
Over time, if the kilocycle dial wasn't moved, the
pebble photo.JPG (1091.4 KB, 1200x1600 - viewed 445 times.) 55305, White Plastic Sheet - 22" x 28" - CREATOLOGY - PN:
screws and nuts that mount the dial also have cable clamps on the
stand and the bug looks like a Vibroplex Original. PTO tube filament transformer and the rear bottom chassis piece were
1969, Collins Manual Peak Limiting Amplifier 26U 1 1958, Collins Instructions KWM KWM 2A Transceivers 1966, Collins Instructions 26J 3 Auto Level Ampllifier
Early Television Sets and TVI
transmitter turned "on" 24/7 - that is, until a few months later
Contributing Member Offline The transmitter weights just over 100 lbs in the
rack and to have PTO frequency dial set to 4mc (as
Also, replacement of the
the mica capacitor failure is loading the transmitter at full power "key
in place since they used "C" clips on the
All that's required is the
November - The new Collins 21A 5kw Broadcast transmitter. dark areas in the dial background. But, almost always the white
relay is far right side of the chassis and the component board is to
the transformer wasn't the correct vintage for the V-3. small transformer mounted to the back panel is the "hum-bucker"
filter cap holes. the correct position. Bavaria Filmstadt near Munich is one of the largest film studios in Europe. 22ga with fabric type insulation. 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. The 32V-2 is a pretty dependable transmitter but one always has
You can mark
The micro-switch by
while. photo left: top of the
kilocycle dial. 32V-1 SN:373 recently restored
Next, the ten
location is the subject of the 1956 Collins 32V-2 Service
The 32V-1 power input was rated at 150W CW and 120W Phone. When installing those knobs verify that, with the knob index at the left
transmitter is at full output power. This wire end had to be reconditioned and resoldered. them set for a couple of days to let the paint cure. remove switches as they are threaded into the front
dummy load was connected and the 32V-1 powered up. CAN'T remove or install the "snap-in"
Galleries, This website created and maintained by: Henry
with two 220pf at 5000wvdc and one 470pf at 5000wvdc. A 5A 6.3vac secondary (~600 watts at 115vac) would be
The Pi-network is an
There's a procedure for
top of the coil) and the service
hole and a 2-56 x 3/16" screw was installed to pull the switch back
strip for the video that was a harmonic for 40M operation. It should have been moved to turn 8 if the service bulletin
All Contents inclusive of URLs involving "collinsradio", protected by Upon removal,
transformer) to have it "resting" in the proper
can't respond fast enough to indicate modulation levels accurately. it should be. drive external loads. You have to connect the shield
photo left: Top of the 32V-1 chassis showing the dense
modification to the location of the tap on the L-network coil (L404) for 10 meters. I've only operated it on 75M and 40M but those bands
while the 32V-3 has two "stacks" of three each capacitors. The second looked good and worked quite well. them the strips can be tapped (using a piece of hardwood
1948 to 1952 - Upgrades
on the glass dial when assembled. center of the chassis has to be dismounted, the 5Z4 and 0A3 have to
harness associated with these last two should come loose
studio equipment and audio processing gear. upgrades to the Pi-L network, to the voltage regulation for the PTO
The 32V-2 changed the antenna connection to a
imparted enough vibration to the 5R4G tubes that their envelopes were
secondary determines if the resulting AC out "adds" or "bucks" so just
bias voltage. of the PTO. This mod used 14 ga
installed two ways. properly installed. background is all the same color with no "dark areas." will be always be "key down." couplers. the have the PTO track from 3400kc to 4000kc in exactly 12 turns. Close
some minor cracking towards the edge of the dial, you can be fairly
becoming a real problem for hams. Some hams used to believe that tubes lasted longer if they
This late-version
The "buzz" is most often encountered in the 32V-3 because
feed-thru filters. dial lamps (ten of them.) Lots of mounting screws
Obviously on 40M (although tuned to 8.0mc,) note that the illumination is even and bright. easy since there are only two wires. admired,after the work is finished,by someone else. Now, an original
Before starting the alignment, test all of the tubes in the
day" this left a significant heat source very near to the KC dial. redesigned much of the old 32V-2 mechanics and some of the circuits so that hopefully the new
with three tuned-multiplier stages to
move it to a position where the dial scale base lines are parallel with the trim
and shield removal, the earlier 32V versions will also require chassis removal
Mechanical "buzz" when in transmit at full power with +700vdc
the LV transformer and HV choke will have to have wooden
115vac input, +HV
over edge of bench)
Others are more difficult, like the
correctly. Replacement is
I
32V Series - Restorations, Operational
less on 15M and 10M. mode and do the tuning. The
panel
Before its "slide to oblivion" it had been worked on
The 32V-2 integrated the
multiplier slug rack is spring-loaded so it will drop to the high
warped white plastic back. >>>
ham band. Remove control
to 1954 -
that without the vellum spacer behind the plexiglass rods and in front
front panel, power supply, PTO/dial, modulator and RF
and Multiplier chassis. coil-slug rack carriers in the frequency multiplier section and full permeability tuning
and why of its evolution (along with a tirade on TVI.). An easy thing to try is to loosen
Note that the dial background is even with no dark spots and the
The dial fiducial mechanism doesn't have to be dismounted. status. * find a piece of wood to put under the PTO to keep it
That's why the white plastic broke into pieces when removed (also, it
chassis is installed into the waiting cabinet. as I removed the earlier version T301. easier if a temporary cardboard spacer is placed under the PTO (between the PTO and the HV
chassis (the interlock switch was another "leftover" ART-13 part.) Transmitters, studio equipment and audio processing gear. holders, RF output connector and the toggle switch. The dial rebuilding procedure
on turn 11. This coupler has to be
Note the
You need to be logged in to use member only content. shows the affects UV exposure has on 32V dials, especially the kilocycle
The photo right shows the 32V-1 chassis with the front panel removed. The silver oxide is
variables, the position of the turns counter wheel (only
module and the Modulator module separated as individual
The fixed-value,
Whether the "high line" voltage really causes any problems is
Apparently, he sometimes operated Maritime Mobile from
This
Logged flintstone mop. This Collins 20V-3 project took a couple of years to get started. Expect 10 meter resonance to be particularly sharp. plastic insulated wire and was probably
can be relatively small. "touching-up" the ANT LOADING control and then not paying attention
Then the FINAL TUNING set to
It isn't necessary to dismount
where on the cam
hadn't noticed for some reason. Be sure all contacts are clean on the #328 lamp
Just the removal of the
audio preamplifier. It was in superb
dial lamp masks are the shown along with the two extrusion pieces
C-switch operation should begin at about 230
units. screen voltage, DC voltage on the PTO tube filament,
The dial scale is
1 - 0B2 - PTO Screen Voltage Regulator, 32V Series - General Repair and
The 32V-2 was operational but just barely. This indicates that this 32V-1 is an early model
position of C405 and to the position of the actuating pin on the Geneva
Note the missing SN tag. The problem was a blown fixed value
frequency readout on 80M. bright sun light. for complete tear-down of a 32V transmitter. most of the
brushing. Switched fixed-value
pieces are missing from the assembly. * remove octal plug from inside power supply module
failure. obtained a Collins 75A-1 in similar condition from the
I found that the CT connection on the PTO
window would darken becoming initially a light tan color and eventually
In the OPERATE position I had about 225mA of plate current
An additional
cause. I took W7TC (SK now) along as co-pilot for the trip down to Tonopah. muting if a Collins 75A-1 receiver was being used, remote actuation of
July - In the B-29 Superfortress from the first. Use the reverse of the
), Minor issue -
You'd have to have the receiver BFO on or be looking
at a panadaptor to notice the frequency drop since it isn't audible
All of these potential TVI problems and their seeming
photo right: Showing the incorrect vintage T301. has also been restored. The original was
Next a piece of vellum placed between the
sold FM transmitters from 1947-1958, but found little demand. The procedure will require having the
Procedure with Two Slight Variations - Remove all knobs
insolvability seemed to restrict many hams from being able to
is further down this page. is now very nearly 100% original,well, original Collins-type and
It was a very late
rear covers were present which is rare. applied to the glass as water-soluble ink silk-screen application. 32V series of moderate-power, AM-CW transmitters produced by
Photo to the
Testing was going to check to make sure I connected T301 up without
In my opinion (and it's just that,an opinion,) I'd rate the 32V-3
Usually in
Find many great new & used options and get the best deals for Collins Radio 20V2 Broadcast Transmitter Instruction Book & Overhaul Notes at the best online prices at eBay! close on 20M and 15M didn't even work because the multiplier
solution to this condition. Install the "C" clips on the FINAL TUNING and ANT. to "unplug" many of the chassis and dismount them for really serious rework. (in the TUNE mode.) If you're
what showed on the 'scope and was heard by the receiving stations on the
(chassis mounted pot adjustment) would have to be set lower to 50mA
which led to crossing the C-switch points with the resulting mica cap
1 - 6SN7GT - Audio Driver
rework, major disassembly will be necessary. operation on 80M and the modulation level was good and the audio
Fifth (and last) Innovation: The Content of Radio Remember that most radio until the 1950s was live Uneasy relationship with the recorded music industry at first The broadcast networks were also mainly situated in NYC, near Broadway talent Primetime was the big radio-listening time To large national audiences So radio content was much more diverse than what we have on . easily corrected. binding taking place. Install the remaining knobs. Even if the 32V-3
old solder, straightening the wire, twisting the end and tinning it. comes loose
increasing TVI problem. coupler (or direct coaxial-fed antenna.) 1 - 6SN7GT - Audio Driver
The most radical part of the redesign however was the output tuning chassis. S402 to confirm that the knob is
One is the plate blocking C and another is the Plate meter
1 - 5Z4 - LV Rectifier
described in both procedures.) I also removed L303 from the parts set
The cabinet was
To see the Original 30J (30 Series) Transmitter Manual click here. - As the 32V-2 was being produced (1948 to 1952) minor
note the position of the ANT LOADING and FINAL TUNING air
tuning up the 32V-2. 212Z-1 Instruction & Service manual 4th Ed. 4uf 1KV oil filled caps (connected in parallel) that had
This assures a good connection and no broken wires. The audio response was 200hz to 3000hz. modifications. Be
and laced (which sometimes complicates reworking,) paints and finishes
Other improvements
swap meets, all with
7. Each adjustment will require lifting the
The object is
be on but not the LV. LOADING controls. >>> Due to the weight of any 32V transmitter, I do all of the
cleaned the kilocycle dial which helped the discoloration almost to
Both components tested good. and 20M, it didn't work on 40M. The 20V3 with the nice sharp corners is the contemporary version of the . Other
tube. I purchased
The station's high-frequency broadcasts can be heard around the globe if you have the right kind of radio. replace the two 4uf 600vdc oil filled capacitors in the +LV supply
electrolytic filter
position for mechanical alignment. layout of the individual chassis that make up complete transmitter. Can be sold as-is; contact us to discuss this option. doesn't have to be lifted - just slid. transient condition which may cause arcing or blown caps. a few hz and
for fundamental overload problems.) 31-34 A return to yesteryear with a 5W AM transmitter Additional information on Heil Ham Radio. The addition of two
without rebuilding it. When planning rework, note that the 70E-8A used
the same power output as the 4D32 but had
automatically tuned as the frequency dial was
touched up the cabinet paint. * remove 4 screws attaching RF module to power supply
I did have
No
transmitter's design was more advanced than any other commercially-built
The 32V-1 transmitter isn't found too often today. I hadn't seen the 32V-3 procedure when I first
the slug rack rollers are positioned before you remove
designs that Collins had developed during their WWII production of
All
COARSE ANT LOADING can be safely adjusted. mounting screws finger tight first (hint: put one drop of 3-in-1 oil on the
actuation string and spring can be seen. 1 - 4D32 - RF Power Amplifier
The circuit is not particularly complex but
then became standard for the 32V-2.) the S.S. Fullerton Hills but this QSL confirms his 10M contact from
procedure must have seemed very inconvenient and overly awkward. roof-top antenna. and buried behind other wiring harnesses or other components. regulator tubes, V-106 0A2 and V-107 0B2,
stability. create a tracking exciter that allowed the transmitter to stay "in tune"
jumper the interlock
perfectly. Note the stack of four fixed-value mica capacitors under
photo above: Face-shot of
settings for each band with the 32V-2 operating into a dummy load. but T301 was a replacement from an earlier version, probably a V-1,
The color
aligns with each shaft when the pto/dial assembly
you're looking for an "easy to fix" ham transmitter then perhaps the 32V
32V-1 (early version) rear view showing chassis and terminal covers
used for the color. This can damage the
procedure requires a receiver with an accurately calibrated
voltage is routed through the auxiliary relay coil by grounding pin 2
sidetone should have an impedance around 600 ohms. Audio Gain does have to be advanced pretty far if a non-amplified
70E-8A, the "B" version floated the PTO tube filaments,) +LV power transformer, +HV input choke and the +HV
Also, the 32V-3 uses a
extended, then that shape "shadowed" the dial resulting in the exposed
4. to pin 6 and measured about 900vac no load and about 450vac from
A very minor problem
L-network inductor, is located just under the
transmitter at full power also contributed to some of the Pi-L network
checking the interlock switch it had merely broke one of the retaining
of the coaxial cable to the "G" terminal and the center conductor to the
I only restored it last summer (2019)
It's more noticeable on CW
Free shipping for many products! opened the interlock switch which opened the +HV line preventing the
the transmitter home. In a 1946 ad, Collins showed how their
Many of these TV-fans were in rural areas ("fringe
and tried 80M with no problems. couple of masking tape strips where T301 is resting on the chassis
interesting variation, although certainly an
externally. to go ahead with the "revisit.". L303 was
bypass,
Transmitters: MW-1A; MW50-C3; Hewlett-Packard. silver-plated Multiplier and PA module chassis couldn't
trimmers are adjusted for minimum signal as measured on the receiver's
were excellent. an unknown load - the reduce the COARSE ANT LOADING control to 1. At the time of design, 15 meters wasn't an
that the serial number tag had been removed. This allows easy
First, they were expensive,priced from around $575 to start (the 32V-1) and increasing to an
This
Can't explain the 4kc error but it was
modulation level is not so high that "cut off" is happening. the correct 220pf and 470pf values required. two years. used in their new amateur transmitter. The bottom screws and nuts have stand-offs associated with
does essentially the same thing (well, not adjustable though.) the auxiliary relay is from the +LV supply through a divider network
complexity that makes the transmitter very difficult
Actually, pin 2 has a relatively high
more than adequate for a
11M-10M for decades - hmmm. each shaft piece. The 32V Series allowed selectable
32V-2 - Three
caused as many problems as they tried to cure. for the typewritten parts of the QSL indicate that a WWII "Mill" typewriter
The range was 3000 km with the two-tube receiver. caps connected in parallel and the smaller cans are the 4uf 600vdc caps
Tuning up in the PH mode and in PA OPERATE can
Here are my experiences with the 32V-2 Pi-L network,I
Once the change is made
transmitters with a Collins logo for a few years, before building the 830 series Although an autotransformer (a Variac or Powerstat)
the cabinet. The dial
aluminum extrusion with the two aluminum pieces mounted together
since that required external connections to a reproducer that might
Continental purchased the Collins Radio line from Rockwell Industries on October 1, 1980, incorporating its line of FM and low power AM transmitters. bypass but three capacitors are fixed-C values for 80M and 40M Pi-L Network operation
times but the "buzzing" was annoying. crystal mike is used. Voltage Regulators, 1 - 6SJ7 - PTO, Oscillator
two parallel connected 15 ohm 25W resistors into the primary
communications to 25 miles.).