One of the 220mfd tantalum capacitors finally completely shorted. It was causing the DC offset voltage to be .6V.
Once I replaced all the tantalum capacitors and set the rail current at 225 mA., the CAS1 sounds great!
Those tantalum gumdrops tended toward shorter life spans than I expected.
If you see any in a Threshold amplifier, feel free to replace them.
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