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75A-3 | Collinsradio
https://www.collinsradio.org/cca-collins-historical-archives/the-equipment-of-collins-radio/the-black-boxes/75a-3/
THE COLLINS 75A-3 RECEIVER The 75A-3 is a dual-conversion communications receiver covering all amateur bands in the range 160-10 meters. It is the only amateur-band receiver featuring the Collins Mechanical Filter. The 75A-3 also …
Collins 75A-3 Manual
http://collinsradio.org/archives/manuals/75A-3_Manual.pdf
The 75A-3is a dual-conversion communications receiver covering all amateur bands in the range 160-10 meters. It is the only amateur-band receiver featuring the Collins Mechanical Filter. The 75A-3 alsofeatures excellent stability, sensi- tivity, and dial accuracy.
Collins 75A-3 Receiver
https://collinsaerospacemuseum.org/collins_brochures/pdf/75A-3.pdf
When tuning S.S.S.c. signals on the 75A-3, turn on the b.f.o., set the audio gain at maximum, and adjust the volume with the r.f. gain control. Where the lower sideband is being transmitted, as is usually the case on 75 meters, set the b.f.o. pitch-control knob about three-sixteenths inch to the right of the -1—1 position.
eHam.net
https://www.eham.net/reviews/detail/7422
The 75A-3 seems to sell for much less than the 75A-4 and yet, by my ears, offers much better audio and more operating flexibility. It is my receiver of choice for AM operation and is used often for BA SSB operation. I have the standard 3.1 kHz SSB filter and the optional 6.0 kHz AM filter installed. If you like the Collins 75A series, give the ...
75A-3 Amateur-R Collins Radio Company; Cedar Rapids IA, build
https://www.radiomuseum.org/r/collins_75a_3.html
Loudspeaker - This model requires external speaker (s). Power out 2.5 W (unknown quality) Material Metal case from Radiomuseum.org Model: 75A-3 - Collins Radio Company; Cedar Shape Boatanchor (heavy military or commercial set >20 kg). Dimensions (WHD) 21.2 x 12.5 x 13.1 inch / 538 x 318 x 333 mm Notes
Collins 75A-3 IF alignment - Amfone
http://www.amfone.net/Amforum/index.php?topic=33045.0
Dan, the 75A-3 I have is a bit odd in my opinion. Its chassis is numbered as serial number 1184. the manual that came with it is a reproduction from 15 April 1954 which states on the addenda that "all changes listed below have been incorporated in serial numbers above 1573".
Collins 75A-3 Updates and Mechanical Filter Housing
http://amfone.net/Amforum/index.php/topic,43373.msg313526.html
A few weeks ago I acquired a 75A-3 and have gone through and replaced caps and tested and replaced resistors. I want to do the Service Bulletin 2 that changes the RF Amp's 6CB6 to a 6DC6 (or 6GM6 as some have recommended).
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