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Roll Call: Who's building, built, or thinking of building a beta22? - Page 199

post #2971 of 3168

The idea behind the 6 board build is versatility.

 

properly done it can be used as 2 separate 3 board systems for 2 different inputs & outputs in the same build.

post #2972 of 3168
Quote:
Originally Posted by wink View Post

The idea behind the 6 board build is versatility.

 

properly done it can be used as 2 separate 3 board systems for 2 different inputs & outputs in the same build.

of course, to listen two headphones at the same time or with a friend eating a pizzabiggrin.gif

post #2973 of 3168
Just a fair word of warning:
It feels great when you're just doing the physical process of building the amp, but once you hit the electrical troubleshooting... I haven't felt this much anxiety in a while. I had to dig into my old medication to handle how awful I felt today frown.gif
post #2974 of 3168

When I built mine I read the directions at least 10 times before I did the testing and biasing.  I was pretty scared to do that too.  When I tested my second board I smoked a part because the cheap clip-on leads I bought shorted the resistor I was measuring the voltage accross to the ground plane.  It turned out not to be so bad, Amb helped me figure out which parts to replace and how to test them.  Don't worry, you can do it!

post #2975 of 3168
Quote:
Originally Posted by Senpai3330 View Post

I was under the idea aluminum is a very popular material for shielding though? The aluminum box should be preventing EMI leak from the transformer is what I was led to believe.

 

Aluminium is a good shielding material for radio waves, but does diddly squat for magnetic fields from the transformer. Get rid of it and wire as if for a one-box build.

post #2976 of 3168
Quote:
Originally Posted by Beefy View Post

 

Aluminium ... does diddly squat for magnetic fields from the transformer.

 

Absolutely correct.

 

Don't forget to try out the transformer in different orientations to see which is quietest. This is important, it can make a big difference. Just listen to the amplifier turned up full with a source plugged in but with nothing playing and turn the transformer around every which way to see if you can hear any difference.

 

w

post #2977 of 3168

I found IEMs very handy in determining if you are hearing any transformer noises.  But I built a 2x gain B22, so YMMV.  If you are building 6x or 8x or whatever the default is then you may be able to hear any noises just fine with your regular headphones.  Also, having the source plugged in and not playing is a must, or you will just hear an unterminated connection.

post #2978 of 3168
Quote:
Originally Posted by Beefy View Post

 

Aluminium is a good shielding material for radio waves, but does diddly squat for magnetic fields from the transformer. Get rid of it and wire as if for a one-box build.

...or one transformer with plastic box like nuvotem-talema and a iron box coated with copper foil


Edited by alota - 7/23/13 at 7:44am
post #2979 of 3168
Quote:
Originally Posted by wakibaki View Post

 

Absolutely correct.

 

Don't forget to try out the transformer in different orientations to see which is quietest. This is important, it can make a big difference. Just listen to the amplifier turned up full with a source plugged in but with nothing playing and turn the transformer around every which way to see if you can hear any difference.

 

w

 

good advice and something i do will all my builds before drilling out the TX mounting hole.

post #2980 of 3168
Quote:
Originally Posted by alota View Post

...or one transformer with plastic box like nuvotem-talema and a iron box coated with copper foil

 

If you want shielding, don't do a half-assed homebrew job - do it properly and get a factory-shielded unit. l have several SumR ones that are all perfect, and very affordable.

post #2981 of 3168

x2 on the SumR recommendation.  they're completely shielded/encapsulated and very reasonable and excellent quality.  i consider the added cost cheap insurance for a noise free, single chassis build. 

post #2982 of 3168

x3 here.  SumR even custom cut the shielding to fit into my case that was not very tall at no extra charge.

post #2983 of 3168

SumR is U.S. brand?

post #2984 of 3168

I think he is based in Canada.

post #2985 of 3168
Quote:
Originally Posted by alota View Post

SumR is U.S. brand?

 

Let me Google that for you......

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