Vintage Asylum: Interesting observations... by crooner Classic gear from yesteryear; vintage audio standing the test of time.

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Posted by crooner (A ) on October 10, 2009 at 09:11:28

In Reply to: RE: JBL SA600 designed by Bart Locanthi posted by geraldm121 on October 10, 2009 at 04:12:10:

As this was actually a radical departure from the early transistor amplifiers.

First generation solid state was Germanium, capacitor coupled and with interstage transformers. Circa 1963-64

Second generation was silicon, quasi complementary, also capacitor coupled. Circa 1965.

The SA-600 would have been third generation, with it's direct coupled fully complementary symmetry circuitry.

The first two generations, specially the germanium units, suffered from crossover distortion with very high IM at low power levels.

This accounted for the harsh sound of early transistor amplifiers.

Bart Locanthi managed to banish crossover distortion from his "T Circuit" setting the stage for the DC coupled designs that followed.

Another remarkable characteristic of the T Circuit is the simplicity of the signal path.

I wonder why you didn't like the sound of yours. Perhaps an early failure of some sort? I believe the dutch electrolytics used by JBL were quite unreliable.

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