by EWBrown » Tue Jun 05, 2007 5:18 am
Very nice looking projects! I'm green with envy of your workmanship. My projects usually end up looking like Russian WWII surplus Yellow_Light_Colorz_PDT_03 Yellow_Light_Colorz_PDT_02
If there is room under the chassis, mount the toroid there, it would be away from the radiated heat of the tubes, and there would be no need to pass the leads through the chassis plate. Besides, bare naked toroids are spugly Yellow_Light_Colorz_PDT_01 If you want to top mount it, look for a nice looking metal cover, one place to look is the local Ikea or other "fancy" kitchen supply store, they usually have all sorts of stainless steel containers for dry foodstuffs.
One major caveat, when using a metal cover with a toroid: Don't create a shorted turn by running the bolt through the top cover, through the toroid and to the chassis plate. This will create a very low resistance shorted torn, and all sorts of evil and nasty things will happen :o
The mounting bolt will have to be isolated from the cover, with an insulating shoulder washer or some other method.
It will need ventilation and airflow, which is good practice with any (tube or SS) power amp, if you use a bottom plate, you would need to make it of perforated material, and stand the base off the surface with some feet, at least a half inch. The chassis plate will act somewhat as a heatsink for this trannie.
For the two OPTs mounted on the wood, they should have individual wires, connecting their frames to a chassis safety ground. "Floating" trannie frames / cores can cause all sorts of nettlesome problems.
HTH
/ed B in NH
Real Radios Glow in the Dark