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Oh you're making it alright! If I drag my ass from Fort Lauderdale to Lawng Island you can get your passport stamped and leave Manhattan. I will see Dinny on this trip.

It is not so much that they are discontinued, as that they were not recontinued. The idea is the come up with a design that I like, make a small run, sell them, and move on to something else. There are so many circuits to explore that doing the same thing over and over is just not that interesting. For what it's worth, I just ordered a run of transformers from Cinemag that should be here some time in late January. Hopefully completed amps will follow not too long after that.

The pot is simply added between the input terminals on the chassis and the input terminals on the board, just like it is on the Crack you built. I would recommend a 4 gang pot and XLR inputs even if you are using SE only since these can be a pain to add later on. If you want to have both XLR/RCA inputs then you need to have a switch to ground the - part of the amp when running it SE (XLR/RCA adapters do this already so no need to worry about it). I for one use a 4PDT ON-ON switch on my amps so the two inputs are isolated from one another but you can just use a 2PDT switch if you do not want that. There is also the option of using bridging pins as you can see on many power amps.