What do you estimate this amp can be built for? Looks like the copper plate GM70 will be about $100 each, but what do you estimate the other parts to cost? Do you have a BOM?
My Raven uses the Lundahl 1689, but I just couldn't (at the time) justify the amorphous cores (an extra $400), but see you suggest it here.
I am such a sucker for pricey iron and Russian tubes.
I'm thinking mercury vapor rectifiers also, and had been for a long time already.
My next project will be some combo of all this, once the (4) current amp projects are all completed, and sorted out (who stays, who goes). So, late year, or so.
Well, I told myself that my next project (after the Pioneer fullrangers I'm working on) would be a nice Tripath class D amp to save power, money, etc...
But after those pics, I just gotta order up some big unreasonably expensive heavy iron for a boatanchor
An amp like this doesn't have to cost a fortune if you're good at scrounging and can do your own casework. The GM70 amp I built came to about $1.500 in parts. The Stax amp I'm bringing to CanJam is very similar to the GM70 amp. Much higher gain, different output transformers, 813 outputs instead of GM70s, but same 1930s industrial design philosophy. Pabbi1, your absolutely right about the mercury rectifiers. No other rectifier comes close. By themselves, they're good for 15-20% improvement over any other type. Once you try this type of design you'll never be satisfied with consumer level designs again.
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