Custom Chassis
- Thread starter minions
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Any sheetmetal shop should be able to do it... all it takes is shears, brake and spotwelder... not the most high tech stuff. Don't expect them to punch the chassis holes for you. Think more in terms of "Unibit" and your own layout for that. Please review the minimum tube spacing recommendations, transformer layout, etc... if you're building a tube amp.
Cagey
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The RCA Receiving Tube Manual http://www.bunkerofdoom.com/tubes/rc25/contents.html is the bible on such things.
As for chassis, you might find that as CB said, most sheet metal shops can do it for you. But, your wallet's gonna make them smile. You might want to find an existing chassis that's close, and modify it as needed. It'll save you gobs of money. A good place to start is at Tube Depot http://www.tubedepot.com/chassis.html. They have a variety of chassis already stamped/welded/drilled, etc. that are priced reasonably. If you end up with a couple extra tube holes you don't need, it's not the end of the world. Call it extra cooling, which all electronics can use. Besides, the Spiders From Mars gotta get in somehow! <grin>
As for chassis, you might find that as CB said, most sheet metal shops can do it for you. But, your wallet's gonna make them smile. You might want to find an existing chassis that's close, and modify it as needed. It'll save you gobs of money. A good place to start is at Tube Depot http://www.tubedepot.com/chassis.html. They have a variety of chassis already stamped/welded/drilled, etc. that are priced reasonably. If you end up with a couple extra tube holes you don't need, it's not the end of the world. Call it extra cooling, which all electronics can use. Besides, the Spiders From Mars gotta get in somehow! <grin>
I heard on another forum that the spacing should be at least 1.5 times the size of the tube's envelope. Also, someone said to move the power tubes a bit farther away from the PT. Does it cause any problems, or maybe not problems, but setbacks in tone if the PT and OT are too close together? The reason I ask is that moving them close together would be moving DC and AC currents side by side, which is one reason why PCBs don't sound as good as hand wired.
Thanks.
Thanks.
Cagey
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I went through the RCA manual, and as much as they say about spacing or mounting is that they should be provided "adequate ventilation". Not exactly an objective specification. But, 1.5 times the envelope is probably plenty.
As for other component placement, the power transformer is going to have a magnetic field around it expanding and collapsing at line frequency. So, it's probably not a great idea to have any kind of signal lines anywhere near it, or you're liable to induce currents in them that'll show up in the output.
As for other component placement, the power transformer is going to have a magnetic field around it expanding and collapsing at line frequency. So, it's probably not a great idea to have any kind of signal lines anywhere near it, or you're liable to induce currents in them that'll show up in the output.
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