Tube Preamp Idea

[Geek]

Originally posted by 6f6
Where are you going to put the power transformer? I would not try cramming it all in that little box.

Toroid time!

Originally posted by makeb4break
you could have one 12:230VAC trannie inside, thus making it possible to use a common 12VAC wallwart on the floor

That would be ingenious.

Use of an old C-64 power supply found in thrift stores would be beneficial. Once the DC side is bypassed, you have 12V, 3A "wallwart". Plenty of juice to drive the heaters and the step-up transformer.


Cheers!

[makeb4break]

Originally posted by Geek


Toroid time!




That would be ingenious.

Use of an old C-64 power supply found in thrift stores would be beneficial. Once the DC side is bypassed, you have 12V, 3A "wallwart". Plenty of juice to drive the heaters and the step-up transformer.


Cheers!

i believe that scheme is used by makers of stompboxes (EH for instance) to avoid having 120/230VAC leading directly into the box

[rcavictim]

That shape case would be easy to sculpt out of laminated MDF. Start by hogging out the interior space while the 3/4" sheets are separate. Plunge router, 4-holes and jigsaw, etc. Then stack them with glue and a couple of alignment dowels. Last step is to machine the outside. A floorstanding belt sander and spindle sander will be all you'll need. 40 to 60 grit for roughing to shape then hand sand with progressively finer papers. Seal, paint.

[mattthegamer463]

Originally posted by rcavictim
That shape case would be easy to sculpt out of laminated MDF. Start by hogging out the interior space while the 3/4" sheets are separate. Plunge router, 4-holes and jigsaw, etc. Then stack them with glue and a couple of alignment dowels. Last step is to machine the outside. A floorstanding belt sander and spindle sander will be all you'll need. Sand, seal, paint.

Good idea. I'll take a look at what the wood tools are capable of at school.

[raypalmer]

Originally posted by rcavictim
That shape case would be easy to sculpt out of laminated MDF. Start by hogging out the interior space while the 3/4" sheets are separate. Plunge router, 4-holes and jigsaw, etc. Then stack them with glue and a couple of alignment dowels. Last step is to machine the outside. A floorstanding belt sander and spindle sander will be all you'll need. 40 to 60 grit for roughing to shape then hand sand with progressively finer papers. Seal, paint.

Beat me to it.. This method is the second easiest out there next to using a CNC machine and a solid block of aluminum to make a unibody front/top/bottom/sides and a rear plate for that.

But that's:

1.) Expensive
2.) Not quite as rewarding when you look at it finished on your mantle.