Looking at their construction details, over the years I’ve suspected that they’re OEM built to their specifications likely by Antique Sound Labs in China. Doing a quick search I’ve found some references like this one quoting a review from a former dealer stating that they are made in China by ASL: http://audioasylumtrader.com/ca/listing/Amplifier-Tube/Coincident/MP-300B/Parallel-300B-SET/135791
It is of course entirely possible that they’ve changed the source for their tube electronics over the years so they could be made elsewhere now. A likely connection is that the North American importer for ASL is also based in Canada.
It is of course entirely possible that they’ve changed the source for their tube electronics over the years so they could be made elsewhere now. A likely connection is that the North American importer for ASL is also based in Canada.