I just acquired the skeleton of a 14" x 21" chassis (an old PA mixer) that will be the perfect starting point for a tube amp, but in contrast to most projects I've undertaken, I have entirely too much real estate to fill up! I need some inspiration.
What do you have in your blue-sky WAF-no-object library? Show me some pics of dual-mono, lots of glass, big footprint component overkill!
What do you have in your blue-sky WAF-no-object library? Show me some pics of dual-mono, lots of glass, big footprint component overkill!
I made this simple SE2a3 5842q amp 20 years ago
An externally hosted image should be here but it was not working when we last tested it.
Even building one of the monoblocks would be something...
An externally hosted image should be here but it was not working when we last tested it.
40 WPC SET using 845's. I built this about 10 years ago when my woodworking tools consisted of a jig saw, a screwdriver and a box of sheetrock screws. Note that the PCB on the power amp is an early prototype of a TSE board. Total weight is about 75 pounds.
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This is going to become a 23" by 16" chassis containing a EL34 stereo amplifier (A. Wright's PP1C with EL184 CCS'es), coming very close to the size of your chassis:
http://www.diyaudio.com/forums/tubes-valves/233631-chassis-design-question-cooling-small-signal-valves.html
For a one-half breadboard setup see:
http://www.diyaudio.com/forums/tubes-valves/221110-locating-hum-source-4.html#post3433193
Full resolution: https://picasaweb.google.com/lh/photo/4lZDBb78M8-QekdmQBOmn42R4HGAUWFuVWcbsPRdpOg?feat=directlink
http://www.diyaudio.com/forums/tubes-valves/233631-chassis-design-question-cooling-small-signal-valves.html
For a one-half breadboard setup see:
http://www.diyaudio.com/forums/tubes-valves/221110-locating-hum-source-4.html#post3433193
Full resolution: https://picasaweb.google.com/lh/photo/4lZDBb78M8-QekdmQBOmn42R4HGAUWFuVWcbsPRdpOg?feat=directlink
I was going to suggest one of Georges builds, but George beat me to it.
So moving on, if you want tube porn on a big chassis, then maybe try Pete Millet's over the top 300B amp with mercury rectifiers.
Unnecessarily complex 300B amp
I'd change the chassis colour to something like black or white, but that's just me.
So moving on, if you want tube porn on a big chassis, then maybe try Pete Millet's over the top 300B amp with mercury rectifiers.
Unnecessarily complex 300B amp
I'd change the chassis colour to something like black or white, but that's just me.
120 Watts A Channel 6336B amp
One of my first tries at large tube amps. Last one is 60 watts a channel 6528A tubes.
EBAY AUCTIONS
______________________________
If brute force doesn't work, your not using enough of it.
One of my first tries at large tube amps. Last one is 60 watts a channel 6528A tubes.
EBAY AUCTIONS
______________________________
If brute force doesn't work, your not using enough of it.
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Great suggestions all! This also tickles my aesthetic sensibilities:
2A3-PP
Perhaps using Pete's universal driver board...
2A3-PP
Perhaps using Pete's universal driver board...
That is a large chassis. I suppose you could make something like this (this is 10 X 17)…
Just bump up the circuit from 50wpc to 100wpc by adding larger transformers and 4 more KT88s.
The thing with large amps on a single chassis is weight. My amp weighs in at 46 lbs.
Adding larger iron and more components will probably add at least another 20 to 30 pounds to that.
As you can see in my pictures the transformers sit on a 1/4" plate of aluminum on top of the 10" x 17" x 2" aluminum chassis and there is an additional 1/4" plate running vertically across the inside for additional support for chassis sag.
My amp is essentially two 50wpc mono blocks on a single chassis.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Just bump up the circuit from 50wpc to 100wpc by adding larger transformers and 4 more KT88s.
The thing with large amps on a single chassis is weight. My amp weighs in at 46 lbs.
Adding larger iron and more components will probably add at least another 20 to 30 pounds to that.
As you can see in my pictures the transformers sit on a 1/4" plate of aluminum on top of the 10" x 17" x 2" aluminum chassis and there is an additional 1/4" plate running vertically across the inside for additional support for chassis sag.
My amp is essentially two 50wpc mono blocks on a single chassis.
Here is an updated interconnection diagram. I added Cinimag balance to unbalanced transformers and the actual B+ voltages at the various boards.
An externally hosted image should be here but it was not working when we last tested it.
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