OP-AMP based balanced horisontal amp....

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Bias will be really tough unless you run class A or L-MOS.

B+ maximum for outputs is about 44V (about 60W/8R) for the OPA2604 running off ±24V.

Higher voltages may be used but it can get very complicated.
 
Very much so except:

The variable bias scheme should not be tried with FETs.

The high voltage LF 353s were obtained by selection for ±20V. An OPA2604 sounds better and will work at ±24V without selection.

Bongiorno says the AD823 selected for ±20V use is even better.
 
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