Electronics > Projects, Designs, and Technical Stuff
EL84 Class AB stereo amplifier chassis
Jwillis:
So finally gathered all the components and transformers. Now I need to set up a placement so I can order the correct size of stainless steel for the chassis. I'll probably get the metal shop to bend it for I only have a small hand break for bending.
Aside from spacing for heat are their any other things I should consider when mapping the chassis diagram.I'd like the power transformer in the middle back and the output transformers on either side. I figure about an inch of spacing for the valves and maybe 2 inches between the transformers should be enough.
AllTheGearNoIdea:
I was only going to say do you really want stainless it’s hard compared with aluminium. Just thinking about drilling and punching out valve bases.
TimFox:
Gold chromate ("iridite" or "alodyne") coatings on aluminum keep the conductivity and are attractive finishes for tube equipment. Anodizing leaves an insulating surface that needs to be broken through for chassis ground connections. Stainless steel is a PITA for drilling large holes for the transformers and tube sockets.
Yansi:
Stainless steel is not pita, if you think first and let em laser cut the sheet metal first!
But I would not use it anyway. Use either steel (powder coated), or some medium-hard aluminium alloy, then anodize. Beware, that harder aluminium alloys are harder/not anodizable, due to the alloy metals in it.
andy3055:
--- Quote from: Jwillis on December 08, 2019, 08:40:57 am ---So finally gathered all the components and transformers. Now I need to set up a placement so I can order the correct size of stainless steel for the chassis. I'll probably get the metal shop to bend it for I only have a small hand break for bending.
Aside from spacing for heat are their any other things I should consider when mapping the chassis diagram.I'd like the power transformer in the middle back and the output transformers on either side. I figure about an inch of spacing for the valves and maybe 2 inches between the transformers should be enough.
--- End quote ---
Make sure to have the 2 transformers as far as possible with each other and at right angle to each other to minimize magnetic coupling that will introduce mains hum on the OPT transformer. If you have not seen already, check this out from Mr. Carlson's Lab:
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