Yep, had a look at it and it looks like it's not that hard to build at all, I seem to remember building it a couple of years or so ago.
The way Matsumin, the designer of the valvecaster circuit, goes about implementing a gain control is a bit unusual, I had to mod my valvecaster build so that the gain control worked a bit better cause when it was built as per the circuit diagram it sounded a bit mis-biased, or it could have been due to the valve I was using at the time, I'll have another go at building the valvecaster circuit and will make sure I start a build-thread for it, will also do some signal tracing with a signal-generator and scope (will post some screen shots too) once I've got it working properly.







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