The brands you mention were very commonly available to US service personnel during the Vietnam war. I assume they were sold through the PX, but when I met people who had been over there, it was pretty usual that they had systems with those brands. Good? Well, a lot were big receivers, with over large bookshelf type speakers, the Garrards of the era were plasticy--by the standards of what I was running in say 1973--Phase Linear 700, Quintessence preamp, Technics SP 10 and stacked Advents, it was not quite the same. By 1975, I had gone to all ARC tube gear using the Quad Loudspeaker- the SP-10 stayed in the system for a long time. Kind of the difference between component separates and receiver based (or possibly integrated amp based) systems. 

I don't want to shun any of that gear- it was a snapshot in history- others may have a different view- I did not serve and I liked most of the guys who came back. I also felt for them because it was in the days before we recognized what the psychological impact was of being on the line. 

I remember this stuff well. Im sure this is what got me into this hobby. 

My sister was dating a guy ( she would marry ) that had recently returned from VietNam. The first time I saw his system I was blown away:  great big Sansui receiver, Sansui speakers with the intricate carved grill covers, Dual TT, big honking R2R and something you don’t see anymore that was more common then ; a reverb amp. This was around 1970. Ive been hooked ever since

I had a friend that was in Vietnam early. He purchased a couple pairs of large speakers and hid automatic weapons in them to ship home. It didn’t take long before the command staff found out. Fortunately for him and being a special position was able to get some good stuff. For him the stereo gear was long gone. To you vets , THANK YOU FOR YOUR SERVICE AND WELCOME HOME, YOU ARE LOVED AND APPRECIATED. Respectfully, Mike B. 

I just finished reading: The Vietnam War: An Intimate History by Ward and Burns. 

I was in college when the draft ended. What a cluster f*. Respect to the 58,000 that died, the over half million Americans that served and the million Vietnamese that died and many more that participated. What a cluster. 

While I lived through the time... I never really understood what was going on. With all the memoirs and declassified documents now available... this book lays it out starting at the beginning, one hundred years ago, and the war at all levels. 

I highly recommend the book.