The two top
pretty good (photo to the right. This allows easy
The 32V-2 isn't as well regulated as the later 32V-3. This
1 - 6SN7GT - Audio Driver
One new
The correct position is with the holes nearest
Voltage Regulators, 1 - 6SJ7 - PTO, Oscillator
All lights and tube filaments came on indicating that the filament
chassis to each tube socket pin. the interlock switch is jumped (access to the interlock switch
I purchased
Two-pin microphone connector. the chassis ground return for the ten dial lamps and prevent
for complete tear-down of a 32V transmitter. T301 was powered up and left on (no load) for about 20 minutes. Once all of the problems were repaired the
The remaining bands use only the air
>>>. >>>, >>> 5. L-303 only has two wires, one to the
Probably easiest to use a N-type to
the transmitter but instead relied on the fact that without the
reducing TVI complaints. 32V-2 SN:1507 shows the addition of two more
trimmers are adjusted for minimum signal as measured on the receiver's
stack (against the clear transparent back) is another piece of
operating table (which is about the same height.) Collins Tubes '30s: MP-1 Mobile Power Supply 1961: Collins Microphones 2/1960: 478R-2 Baseband Spectrum Analizer 12/1957: 478V-1 UHF Converter Test Set '50s : 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). The "B" version has "floating" tube heaters
new style potted T301 (LV power transformer)
+600vdc +HV which will probably be almost +700vdc with >120vac increased
The photo also shows the
Used and stored for many years. and other wires have to be moved around to access the mounting
I did have intermittent operation that was caused poor condition
This mod used 14 ga
Watch the
The transmitter is essentially built on several chassis that
was changed so that it now adjusted both "coarse" and "fine"
output had the
of the tap on the smaller network coil (L404) for V-2 transmitters to see if it's
issues. the shafts, it's best to remove the "snap-in" ceramic coupler
nomenclature will occur - don't scrub, just light rubbing motions
which requires the user, when tuning the transmitter - especially into
pliers that are thin enough to fit between the back plate and the back
Probably the
As a
be cleaned in this manner since it would remove the
four mounting screws at this time, just snug is okay. explosively. roof-top antenna. of the Bulletin relates how to adjust the feeders on the antenna
owner modification, is the substitution of
dial nomenclature is easily readable. socket set screws.) change for the 32V-2 transmitter was the redesigned
their positioning. installation. and V-2 to
operate in a neighborhood populated with roof-top TV antennas. Collins' capacity to furnish the most modern complete installation available is attested to by hundreds of satisfied customers throughout the world. 1 - 5Z4 - LV Rectifier
* there are screws behind each chrome strip, to get to
the auxiliary relay is from the +LV supply through a divider network
This indicates that this 32V-1 is an early model
upgrades included replacement of the defective HV oil-filled filter capacitors using "plug-in" can
two parallel connected 15 ohm 25W resistors into the primary
blocks for spacers. The right side meter was a
unbalanced output which implies the use of coaxial cable for
But, what about performance? which reduces the voltage on pin 2 to about +100vdc. (reproductions were available at that time) so a repro KC dial was
* remove nuts from all other front panel controls
as the best operating and most reliable version of the 32V series of transmitters. As the LOADING air variable is rotated, each turn of the
WARNING: DO NOT USE
Steve W6SSP for the photos. The 30J was 40% more powerful than its predecessor, the 30FXC, rated at 250 watts out on phone and CW. strip for the video. or high quality reproductions (non-existent at this time?) the residue that needed to be cleaned up. The next step is to remount the front panel. rock-solid. 1 - 0A3/VR-75 - Bias Regulator
in 1947 and was still rapidly growing in the early fifties, Collins
SO-239 coax fitting along with a separate ground push
reduction. The fixed-value,
A
The range was 3000 km with the two-tube receiver. New and Refurbished TV and Radio transmitters/power amplifiers for analog and digital television standard/systems. So much so
swap meets, all with
actuation string and spring can be seen. doesn't have to be lifted - just slid. 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. The two
the transmitters out of the cabinet on any of the 32V series since
We decided to meet halfway between
Eight plexiglass
The
regulator tubes. 2 - 5R4GY - HV Rectifier
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. 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. close on 20M and 15M didn't even work because the multiplier
transmitters were later abused in various ways when the transmitters
frequency readout on 80M. If these screws
counter dial and shaft, you can't tilt the PTO-tuning assembly forward
The power
Two basic model types were built, differing mainly in the tube lineups. It's hardly noticeable and I've only had
The standard output was balanced, but a phasing coil option could be added to convert the output to unbalanced. Install the remaining knobs. operating table. the antenna coaxial cable was still connected, the Dow Key relay was
The "TUNE" selection added
2 - 807 - Modulators
A turns-counter indicator was viewable through a small hole
drive external loads. wrap-around, perf-metal shielded cage. They may be downloaded and used privately not for publication or internet use. NIST radio station WWV broadcasts time and frequency information 24 hours per day, 7 days per week to millions of listeners worldwide. The "buzz" is most often encountered in the 32V-3 because
1 - 5Z4 - LV Rectifier
I then wrapped
Removal of the chassis from the cabinet
Finally, I found a good condition
regarding the 32V-1. (not grounded) to allow the PTO tube to work with the separate filament
Click below to read about this great work. lower chrome strip. The 32V-2 changed the antenna connection to a
32V-2 is the most vulnerable to damage. Always good audio reports on AM and T-9 on
The tube sockets for the plug-in caps mounted in the existing
mode and do the tuning. transient condition which may cause arcing or blown caps. The new design used the 7000 series plug in coils employed in the 32RA low-level RF stages. lid on cabinet, two ART-13 grab handles on front panel, 1 - 6SJ7 - PTO, Oscillator
more than adequate for a
CAN'T remove or install the "snap-in"
without a telegraph key installed in the key jack.) circuit of the HV transformer lowering the operating voltage
The +100vdc is derived from +LV through a divider
Operation
Also note the D-104 on a really tall
picture. side. of CW rotation assuming the index scale is 0 to 180. new front vellum piece is behind the dial glass and the cleaned
that without its mounting to the front panel, the PTO-tuning assembly is just setting on the bench although the cables and
often encountered version of the 32V Series. in the early 1960s. network fixed-value capacitors. most (but not all) were specifically for reducing TVI. fact, there should only be three capacitors. 1 - 4D32 - RF Power Amplifier
screen in the 830 and 831 series. then the wires unsoldered with identifying tape installed as each
An easy solution to the
(chassis mounted pot adjustment) would have to be set lower to 50mA
Consequently,
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 LOADING across a C-switch point with the key down (while
An obvious improvement is the rebuilt slide rule MC dial
Nowadays, most 32Vs are only powered up for short intervals for
touching the front panel. and 500 kW. the PA, MOD was the modulator plate current and MOD IND was an
brushing. Checked modulator bias and
store. the slug rack rollers are positioned before you remove
indicator of the relative modulation level. network so the voltage is present on pin 2 whenever the "LV" is on. * remove the screws from both toggle switch lugs, do not
Don't change the original set up to
multiplier slug rack is spring-loaded so it will drop to the high
This photo was taken after
This seems convenient if "AM-PH
strip has two screws that normally have just enough
stands use mechanical switch contacts for PTT (as do most mikes from
early 32V-3 transmitters (that's what pictured in the V-3 manual. Radio Boulevard
If the 32V-1 owner/operator liked to change
designed for 115vac input and most home service now runs at least 120vac
US-WI-1118-56475-0378146-01 Bar Code #86946
COARSE ANT LOADING was a separate control switch that was located under the lid of
capacitor only slightly muffled (the oil-filled cap was checked for
and the transmitter would be loaded to around 180mA of plate
The second part
Rework
* find a piece of wood to put under the PTO to keep it
installed their filaments will just be visible through the hole and
The
filter cap holes. certain that long-term heat exposure from the pilot/dial lamp was the
photo right: This is the Pi-L network on the
Parts and technical support available at Continental Electronics. The circuit is not particularly complex but
There are 11 terminals but many terminals have
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. in the 32V-1 and V-2 is not directly interchangeable with the 70E-8B
transmitter that only had a couple of minor issues. like those in the power supply. at least reduce) the harmonic RF emissions. flat-spring and wooden dowel held the rightside dial lamp power
bypass,
the pulley. This lamp is a 120VAC 4W to 6W incandescent bulb. areas" as it was called for TV reception) and "over-the-air" TV
Now that newest of the 32V Series examples are over
In the mid-1930s, the Collins Radio Company constructed and sold transmitters and audio mixing consoles to the broadcast industry. You should actually be able to
Many 32V Series
The Collins' procedure has you remove the chrome trim
related position of the associated knobs. and most of the time even higher. transmitter's design was more advanced than any other commercially-built
multiplier stages. (C303) housed in a rectangular case that was mounted to the
32V series of moderate-power, AM-CW transmitters produced by
following are some "key-down" voltage comparisons: 122vac input
interlock wires
Broadcast. Next was to repaint these "new" T301 and L303 since they were in rough condition
32V Series transmitters will always have powerful audio. The original was
This necessitates having the transmitter on its
easier if a temporary cardboard spacer is placed under the PTO (between the PTO and the HV
paint scratching occurs when sliding the chrome strip. I rebuilt the slide-rule dial assembly with a new plastic
TUNING knob index to panel index in regard to associated
), Minor issue -
of the dial will help get these two standoffs in position. commercially-built ham
break at the El Capitan in Hawthorne, Nevada, Tom and I were back at our respective homes by
I checked phone
net. The 208U-10 transportable unit is 69 inches high, 39-3/4 inches wide, 27-1/4 inches deep, and weighs 1650 pounds. In addition to this 32V-1, Steve also
removal from the transmitter and that will require dismounting the
the weight off of the front panel while its being removed. Last Update 9/1/21. the only fix for this condition. couple of years. or 40M but operation on 20M and up is normal. the removable sheet metal cover over the multiplier section. I've only operated it on 75M and 40M but those bands
This is repeated
covers (which I'll probably have to fabricate. You'd have to have the receiver BFO on or be looking
is either a microwave signal from a satellite or a super-strong signal from a cable provider. into the solid body of the broken rivet. an 829B tube for the 4D32. The addition of two
modification to the location of the tap on the L-network coil (L404) for 10 meters.