How do we remember 1970s amplifiers?


I would be curious to hear some of the memories and impressions associated with the following short list of 1970s amplifiers:

- McIntosh "first generation" SS amps, MC2105, MC2505, MC2300, MC250, MC2100
- Dynaco Stereo 400 and Stereo 120
- Phase Linear 400 and 700
- Bang & Olufsen "slide rule" receivers (i.e. especially blackface Beomaster 4000)
- Original Ampzilla (not Son of Ampzilla)

I've chosen this list mainly because they cover a wide range of approaches to solving the issues of early semiconductor technology, and they were all pretty mainstream products in the U.S. I'm excluding the Japanese receivers/amps not out of predjudice; it's simply that the circuit designs varied quite a bit with each model, and thus harder to broadly classify their characteristics.

I'm interested in impressions of both sonic and non-sonic attributes, and a preferred ranking of the above, if you like.
kirkus

Showing 2 responses by normansizemore

g_nakmoto,

I have to say that back in the 70's I was a Phase Linear user and was surrounded by others who used Phase Linear.  I remember the sound being wonderful, fast and clean. Amps that I owned were the 400 series's One and Two. Never a problem. My friends owned 400s, 700s and one used two D-500's. We ran them hard and never had a problem not ever. 

I even used a 400 to run a PA system for my band. Now it wasn't built like my McIntosh MC-2300, but then nothing at the time was. Still all this Phase Linear bashing?  A Phase 4000 preamp and any of the above mentioned amps makes a sweet little system that will drive anything. With regard to frying speakers, I can't remember that happening either. 

I like most have moved on but I know if I had too I could live with any of my old systems, Phase, Mac, GAS, Citation, Levinson etc. I have re-discovered my Sansui 9090db a few years ago and haven't been listening to anything but it. Seems to do everything just about right. 

N
chuxhifi,

Doesn't surprise me. A friend ran two D-500's bi-amping a pair of the original AR-9's.  Sounded amazing. I could easily live with my old Phase Linear gear.  Enjoy the 700.  It's a wonderful little amp.

The damping factor on the 700 is 1000.  Your woofers love that type of control.  

N.