Technics SA GX670

d-ray657

d-ray657

Ain't this boogie a mess
I don't know if this is a score or not. Went garage saleing today and picked up a Technics SA GX670 with the remote for 5 bucks. When I picked it up it was pretty heavy, and it looked to be in good condition. I was gonna offer $25, because it wasn't marked, but the lady running the sale ran down to ask her husband, and he said $5 each for the receiver and the CD changer. That made it an easy decision.

It looks like it is 110 watts per channel in stereo mode. I wonder how that compares to old school watts.

I guess the guy was just cleaning out his basement, because I also picked up a Craftsman jigsaw for the same price ($5.)

Regards,

D-Ray
 
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Looks quite similar to the SA GX720 that I have. Both are early pro-logic home theater receivers. For $5 it is probably worth it if you need something cheap with lots of power. Sound quality is not the best at least on my 720 in my comparisons. However, your 670 might be better, as it is made in Japan and mine is not. The 720 I got says it will do 100WPC in stereo mode and I believe it. Easily way more powerful then my SX-750. Should be a good and reliable receiver even if it isn't the best sounding around.
 
I have a Technics SA-GX670. Bought it new back in the 90s or 80s. Never thought it sounded very good. I upgraded it for a Yamaha receiver.

I'm listening to it now and not really liking it either. I'm fixin' to swap it out for an HK receiver I've got in my office.

Certainly reliable, though.
 
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I'm now thinking that me not liking the Technics' sound was just in my head. I have compared it to a Harmon / Kardon AVR 20II, and an Onyko TX-DS494 with the same speakers and inputs this week and they didn't do as well.

One thing that the Technics does is have full A & B speaker functionality. The Onkyo does not allow A & B at the same time; the HK attenuated A quite a bit with B turned on.

Its manual may be found at http://www.managemylife.com/mmh/lis_pdf/OWNM/97110223.pdf
 
The GX series arnt that great as the Chip they use is not the same as the older series SU_V .. give it some time SVI2004 will comment on this one .. there still a nice amp just not as good as the older Technics
 
Its faceplate says "class H+". Is that something special or just BS?
 
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Yeah... I can understand the comments about the overall sound... This set was mid 90s and based on the RSN modules... Class H+ is a dual rail voltage setup, when the signal is higher the output transistor is switched to the higher rail voltages (a way to reduce volt drop and reduce heat) there are a number of manufacturers using this scheme, and Id say there would be a few threads on here about class H amp topology.

Give me the older new class A amps from the 80s anyday :)
 
The mid 90's stuff was indeed pretty reliable, if not sonically the best stuff Technics ever built. I had a few Technics GX receivers I retired that never gave me any trouble at all, I just didn't care for how they sounded. By the same token I bought a fairly new Denon home theater receiver last year that didn't have the warm full sound I like either, and I've never cared for my Pioneer HT receiver when it comes to reproducing stereo music.

I do think they'd be great for larger spaces and get togethers/parties, though....lots of power for very little money!
 
I got one of these donated to me a few yrs back, its missing the large tuning knob. Powers up and if I remember its intermittent through the headphone jack. Probably a loose connection on that. I thought I hooked up speakers and there was no output but not sure as its been a while. Are they using STK output IC's in these? Most of the 90's stuff seem to have been designing stuff with them in there as final amps.
 
Thanks, never worked with those before. They look generally available on the market still, good to know.

Some research on the knob says its Part No. RGW0171-K and of course obsolete, NLA backorder forever etc.
Used in models: SAGX550,SAGX650,SAGX670,SAGX770,SATX1000,SATX1010

For sure they are selling for cheap on fleabay. I guess not a really fancy "high-end" type of stereo.
One of my colleagues who has worked on this series before says to expect lots of poor solder connections.

SVI2004A said:
These are using 2x RSN3306 class H hybrid ICs
Click to expand...
 
So I've had this on garage duty for more than 11 years. Cleaned the pot on the volume knob tonight so it's ready to provide the soundtrack for my projects awhile longer. I guess the comments on reliability were spot on. The old Kenwood cassette deck that also sat out there did not fare as well.
 
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