The circuit might operate with the rest of my design, but there are no guarantees. I have not tested it. It's quite likely that Payalneg is using it with different circuitry. Hopefully he will let us know.

The loop amplifier I presented has all of the attributes that I required. If I thought it could have been simpler, I would have made it simpler-- but not at the expense of my design goals. One of those goals was (and always is, for me) maintaining operation within the published specifications of the components used. That's one way to increase the chances of success for the average builder.