I just want to 2nd this. It must be nice to have access to something like that for this hobby. I bet some nice capacitor mounting brackets could be made from that Corian.
Er,
1Meg between circuit Gnd and supply Gnd is way to high and will not give enough protection..
You need as close to earth as possible without hum issues.. If the circuit gnd needs lifting "at all" then you should not need any more than 100 ohm with high wattage...Reason is if you get a short circuit the supply fuse should blow, however if for some reason you get a fault that lifts the the ground the voltage drop across the 1 meg could give a leathal voltage on the circuit ground not enough current will flow to blow the fuse and so you have lost auto disconnection of supply.
Regards
M. Gregg
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Thanks for the kind compliment. My Shopbot CNC has truly revolutionized my DIY from building speaker enclosures, making kitchen cabinets, boat building, making signs and now this.
I will try to reattach
Hi brucetassin
long ago I stopped using metal enclosures for tube gear.
Wooden boxes looks nicer, neater and never got microfony with them.
These are my two SET`s: 300B and 6C33C with pentode mode drivers. Point to point wiring, ground bus...
Oak around, 6mm teflon plate on top. No hum, no buzzz, no RF interference, no microphony. Never.
Go ahead. Make neat and you'll be happy for sure.
Hi brucetassin
long ago I stopped using metal enclosures for tube gear.
Wooden boxes looks nicer, neater and never got microfony with them.
These are my two SET`s: 300B and 6C33C with pentode mode drivers. Point to point wiring, ground bus...
Oak around, 6mm teflon plate on top. No hum, no buzzz, no RF interference, no microphony. Never.
Go ahead. Make neat and you'll be happy for sure.
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In Defence of Wood
It's not obvious to me that the production of steel is "greener" than the harvesting of wood. The greenest choice is usually the use of used or surplus material. I am able to pick up mill ends (surplus) that make a very nice chassis for very little cost and at zero impact other than the fuel burned on the trip to the store.
As for power consumption, I can offer no defense.
Can't you be more friendly to the environment by using less or no wood?
If the cosmetics is your concern, why not build the chassis out of metal first, then tag on thin wooden board with the veneer finish of your choice. That will simplify the structural aspect of chassis and use less wood.
It's not obvious to me that the production of steel is "greener" than the harvesting of wood. The greenest choice is usually the use of used or surplus material. I am able to pick up mill ends (surplus) that make a very nice chassis for very little cost and at zero impact other than the fuel burned on the trip to the store.
As for power consumption, I can offer no defense.
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I only use NOS vacuum tubes for the simple reason one of these days we are going to run out of vacuum. The last thing we need to let happen is the release of any more vacuum to our atmosphere...
Bruce, have you noticed an issue with AC current through a wood wire? I would think for the half cycle that the electrons went against the grain would be a problem...
Bruce, have you noticed an issue with AC current through a wood wire? I would think for the half cycle that the electrons went against the grain would be a problem...
If you heat wood anaerobically you might turn some of it into graphene, which is a conductor. This is the opposite of cryogenic treatment. Maybe electrons will tunnel between the graphene strands? Of course, for this to work it has to be some obscure wood from an obscure forest in an obscure country, harvested by virgins at a full moon.
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