Those big GE amps

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Does anyone know what output devices those monster GE amps used.

FYI the amps were made in the 80's, had 64 output devices, amps were mono. 20 KW into 4 ohm load, that's right 20,000 watts. The output was designed my Crown and the driver boards by GE. I have no dilussions of making one of these, I'm just wondering how it was made. They are supposedly stable into < 1/4 ohm.
 
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