Layout critique needed

What about putting the PT and choke in the back, then run the OPT's down the middle? Put the tubes to the sides except for the odd one, which could go in front.
 
Or use some high dollar Cree diodes and forget the odd tube.:scratch2: SS into a choke is black hole quiet for them sensitive type spikkers.:yes:
 
targeteye said:
For the sake of discussion whats the pros and cons about building the power supply on a separate chassis and using an umbilical?
Click to expand...
Hey Steve, the only disadvantages I see to that are the extra chassis work and the extra space needed to house it all. More parts to buy, too - I priced that option once, and it adds up fast.
 
Redboy said:
Yeah, caps and some little filament transformers, too - I kinda like a wiring challenge... :rolleyes:


From a thread of mine. I remember that now!
Click to expand...

Make a deep base for it.

I doubt this will help much, because it is with respect to all metal chassis without a wood base.........
But when I was building my 2A3 amp and visiting my audio buddy up here, he took one of the filament transformers and powered it up with a variac.
He then connected the filament xformer's secondary to a scope.
With the metal bud box type chassis lying top side down on the bench, he then moved the filament transformer around the chassis, monitoring the scope's waveform for interference.
When a place was found that didn't affect the waveform, that's where they would be mounted. It turned out to be on the back panel of the amp, right under the PS transformer.
I'm pretty certain this is one reason why the amp is in the lower 1-2 millivolts with regard to filament noise.

I'm pretty much guessing, but I think as long as the PS xformer and OPT's are oriented properly, the magnetic coupling/noise shouldn't be a problem.
But if you are AC heating with filament transformers, you may have a issue with magnetic coupling affecting them, and introducing noise. You'll never know until you do it, you may not have any problems at all.
 
If my opinion matters at all, I like the looks of the rectifier up front.

Other than that... it looks great!
 
I like the rectifier up front as well, but I REALLY feel that chassis is just to small
an crowded together for me, heat will be an issue, wiring will be an issue then I
see if you do have noise problems you'll not be able to do anything about it.

Just My 2C, carry on..
(Looks like it's asking to be mono blocks to me) (Or at least seperate power supply)
 
Last edited:
Okay, you guys. Back to square one, not taking any chances here. This is it, basically a carbon copy of my 2A3 build. Essentially the same circuit, I've got no hum problems with my current amp so I expect none with this...

attachment.php
 

Attachments

  • IMG_9320.jpg
    IMG_9320.jpg
    75 KB · Views: 46
Destructor said:
I like B or a variation of B, the transformers look a bit crowded in A. It looks like it will have that spartan utilitarian look, clean and simple. Form follows function-to a point. Some day I will put my spare Mac MA230 output and power transformers to use in this way and copy the 230's circuit.
Click to expand...

That is exactly what my P-P 6550 amp is! I upped the B+ to around 600 and regulated the front end and screens on the 6550. Was an idea in an old Glass Audio magazine, "70 watts of Mcintosh Power" it works great, and has since I built it in the late 90's. Of course I only used the outputs, not the power transformer.

Russellc
 
I dunno Nate, those TXs look awfully close together.:scratch2: What if (just thinking out loud), you moved the OPTs up to the front, and put the power triodes in the middle?:scratch2:


Even with the OPT turned 90 degrees (to prevent actual coupling), I'm still afraid of just plain old inductance getting into it from the PT. I'm probably all wet though, so take this with a grain of salt (consider the source in other words).
 
I'm not a design expert. But, there have been plenty of 'design experts' that came along before we came along, that have placed the xformers together, and have placed the valves together, for a reason.
 
Hey Red, I like the tweeked version of B, but it looks like you could move the rec tube out front a bit more and pull the choke out as well by that much. Cheers. p.s., I hope you read this now that I have a new avitar.
 
You must log in or register to reply here.
Back
Top Bottom