I am considering buying one of these with a blown channel. how difficult should it be to source all of the transistors for one channel? Any advice from someone who has experience with these would be awesome!
I had a DA-1 since about '97 and it decided to blow a channel on me in about '04. The great thing about old school analogue amplifiers are their simple and reliable topology. The way I went about fixing mine was to rip apart the components on the other channel one by one and record each of the component values and model numbers. Using this information, you can completely rebuild the opposite channel. Cost me a total of about $100 AUS for the transistors, resistors and capacitors. Took about a month from start to finish.
In conclusion, what you are trying to achieve is absolutely possible and if you believe the benefits are worth the cost then please, be my guest, and repair that broken channel. It is an incredible amplifier and a testament to good and old topology.