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In Reply to: RE: Any thoughts on this 60's solid state Pioneer SX-700T? posted by blownrx7 on January 15, 2016 at 06:21:10
Back when those products were new, the manufacturers' trumpeted "pure, clear transistor sound" and went out of their way to say that the new, big thing DIDN'T sound like tubes!
No, they don't.
Assuming (???) it's a capacitor-coupled amplifier (i.e., there are large-value output capacitors to remove DC from the speaker outputs), it WILL benefit greatly from new output capacitors. Indeed, it would likely benefit from the replacement of many of its capacitors (especially electrolytics) -- is it worth the effort and/or expense? Not really, but it could be a labor of love for someone.
It's worth $60 if it is in good cosmetic & working order, I'd opine (if barely). Check to be sure that the transistors are all silicon -- the earlier germanium transistors may (???) have sounded a little better, but they're very fragile and unreplaceable at this late date.
As a postscript, the tuner section may be pretty good. I don't know much about this model (I do have a fairly similar Pioneer SX-1500T, FWIW, see below), but some of the earliest ss receivers from Pioneer and others, due to the lack of good "high frequency" transistors, used hybrid tuner front ends, with Nuvistor tubes. Whether hybrid or not, I've generally found many of the early ss receivers to have better-than-average tuner sections -- if that matters at all to you.
all the best,
mrh
Follow Ups:
Hey I think I had one of those YEARSSS ago.
I found it after some one chucked it out some time in the 80's
Blownrx7, if you're a vinyl junkie, you'll enjoy plugging your turntable into Tape HD & experimenting with the different eq modes. It was designed for reel-to-reel tape, but magnetic phono cartridges don't seem to mind. Along with replacing caps, also replace stock wiring with 16 gauge. Got a SX-1000Ta in audio arsenal. If ya need a wood cab, send a PM. 73s para Sactown
The service manual (which includes specs and operating information) is available at hifiengine (link below). Free registration required to d/l their content, and it's well worth the effort if you're not registered there already.
It does indeed appear to have capacitor coupled outputs (if I am reading the schematic correctly); looks like 1000 uF output capacitors.
all the best,
mrh
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