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Round Emblem Collins S Line |
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(clickable picture) |
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There is a Collins logo on the front panel of the S Line equipment. The earliest version of this emblem was "winged" while the later version was "round". It is common terminology to refer to such units as either Winged Emblem (WE) or Round Emblem (RE). In today's collectors' market RE units sell for quite a bit more than WE units. |
75S-3B Receiver (Round Emblem)
This is 75S-3B serial number 85134. It was made around July 1966. This one is loaded with filters: it has the 2.1 Khz mechanical filter for SSB, the 500Hz mechanical filter for CW, the 200 Hz Crystal filter for CW, and about 6 Khz wide on AM. It works well, drifts very little and is calibrated well on all bands. I've done the field alignment on it and aligned the sideband offset. It is not as sensitive as the ICOM IC756PRO, nor is it as selective, nor does it have very good noise reduction capability by today's standards. But I still like it. I use it with a 312B-3 Collins Speaker.
The first thing I noticed when I got this radio was that the audio was so much nicer to listen to than the audio from the 756PRO. But I fixed that by changing the way I use the 756PRO. First, I put a 312B-3 speaker on the 756PRO and adjusted the IF passband down by 100Hz to give it a bit more bass. Then I realized that I was in the habit of using the 2.4 Khz filter on the 756PRO, which is much narrower than the 2.1 Khz filter on the 75S-3B. So I started using the 3.0 Khz filter unless conditions warranted using something narrower. The result was that the 756PRO now sounds at least as good as the 75S-3B. Still, when I just want to drop in the shack and listen around, I go for this receiver.
75S-3B Summary
Year manufactured: 1964- 1976
Tuning Range: 14 200Khz bands between 3.4 and 30 Mhz
New Price in 1964: $620
Dual Conversion
Audio Output: 6BF5 delivering 3.0Watts into 4 ohms
Product Detector: Yes
Filter: Mechanical
Number of tubes: 12 plus 7 semiconductors
Changes from the 75S-3: one IF filter plus 2 position switch for optional CW filters,
3 watts of audio output instead of 1.8 watts,
oscillator stabilized by zener diode on the power supply,
has socket for AM filter.
Product Detector: Yes
Filter: Mechanical
Size: 7.75"x14.75"x12.5"
Approx. Weight: 20 lbs
32S3 Transmitter (Round Emblem)
This is 32S3 serial number 100414. It was made in 1967. It is completely stock. It did not work when I got it. I had to replace a couple of tubes, perform the field alignments, and align the sideband offset. Since then it has been doing fine.
32S3 Summary
Modes of operation: SSB and CW
Frequency of operation: Ham bands 80 - 10 meters
Year of manufacture: 1962 - 1975
New Price in 1963: $750
Later price: $938
Input Power: 175 watts on SSB, 160 watts on CW
Final Tubes: two each 6146
Requires 516F-2 power supply
Size: 7.75"x14.75"x12.5"
Approx. Weight: 20 lbs
30L-1 Linear Power Amplifier
This unit does not have a serial number tag and I haven't tried to figure out when it was made. The Round Emblem and its condition seem to indicate that it is one of the later units. The relay failed after about one hour of use (after I bought it). I installed a new one from Surplus Sales of Nebraska and it has been fine ever since. I also installed a new diode board and the power supply seems to be a bit stiffer now. The output varies from time to time and band to band but is about 600 watts.
30L-1 Summary
Year manufactured: 1961 - 1975
New Price in 1961: $520
Price in 1977: $1,536
Frequency coverage: Ham bands 80 - 10 meters
Operating modes: CW and SSB
Input Power: 1,000 watts PEP
Output Power: about 600 - 650 watts PEP
Power Tubes: four each 811A
Size: 14 3/4" W, 7 3/4" H, 14" D (with feet)
Weight: 38 lbs
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This is 312B-4 Station Control serial number 70477. All such units include a speaker, RF directional wattmeter with 200 and 2000 watt scales, and a phone patch. Its size is 10" W, 7-3/4" H, 12-1/4" D and it weighs 8-1/2 lbs. It is in perfect shape. The white stick-on label indicates that this unit is being driven by the RE S line. I prefer the audio from the 312B-3 speaker. So I no longer use the speaker in this unit. I might use it later to monitor 2 meters or something of that sort. |