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Old 22nd November 2012, 09:20 AM   #271
AndrewT is offline AndrewT  Scotland
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There's no To247, nor To264 mica insulators on that page !
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Old 22nd November 2012, 06:13 PM   #272
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Haha, you're right! Odd...?

I cut my own insulators from a piece of Keratherm Red that I got as a sales sample. No messy mica and goop...
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Old 2nd December 2012, 03:24 PM   #273
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Help needed,

I´m building the ba/1 in a balanced version front wil be ba/3.
I have four transformers each of them 2x 18v 500va .

As I understand the origal powersupply schematic uses 2x 9V or 18 v with centertap.
I have four transformers each of them 2x 18v 500va
How should I apply my transformers.

Your assistance is much appreciated
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Old 2nd December 2012, 03:44 PM   #274
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by Alettagla View Post
I have four transformers each of them 2x 18v 500va
How should I apply my transformers.
that ought to work

with 2 trafos you can build two 'ordinary' stereo amps, and bridge them
or with all 4 you could build two 'dual mono' stereo amps, and bridge
both would give you two balanced mono amps

but its a funny question, considering the difficulty of such a big project

edit...... 2x 9V or 18V CT, I dont know where you got that from, and does not sound like what you just wrote..... 'have understood the original power supply schematic'......

sorry, I don't mean to sound harsh
but you are facing serious problems
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Old 2nd December 2012, 04:03 PM   #275
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Thanks,

I was to quick with posting this question. In the meanwile have worked this out.

Alltough I admit building this thing is a lot of hassle.

regards René
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Old 2nd December 2012, 04:05 PM   #276
tinitus is offline tinitus  Europe
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ask all you want, please

but I would hate to see you ask how to fix it

better safe than sorry
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Old 3rd January 2013, 09:01 PM   #277
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Default pics of an experimental setup of one hardwired working BA 1 outputstage/buffer channe

Here are pics of an experimental setup of one hardwired working BA 1 outputstage/buffer channel. I had to try one first to see if there were no wiring errors .

Yet another 3 of these to go. ( these will have a little improved tidier wiring and some decent input caps)

No DC and no hum on the outputterminals.

I had hoped that my wadia 830 would deliver a sufficient amount of voltage but it doesn´t.

So I guess I will have to put ba3b in front of this.

Regards René
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File Type: jpg DSC_0238.jpg (764.6 KB, 178 views)
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Old 3rd January 2013, 09:30 PM   #278
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by Alettagla View Post
I had hoped that my wadia 830 would deliver a sufficient amount of voltage but it doesn´t.

So I guess I will have to put ba3b in front of this.


yeah, its 'only' a power buffer
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Old 13th January 2013, 06:20 PM   #279
coils is offline coils  United States
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Default SE Burning Amp almost done

Hey everyone, I wanted to share some pics of a single ended BA that I am working on. I just fired it up last night, and had to change two fets that I mismarked when I matched them. Other than the heat, it is all good.

I know, the sinks are horizontal. It was a compromise, and I may compromise more because of it. Either by taking out pairs of fets or using R219(131).

The amp has +/_ 23.5 volt rails, using an antek 8420, 12 matched irfp040 per channel, all 1 ohm source resistors have .6v or so across them. Adjusting the offset was easy. After two hours idling, the sinks settle at 65C. I am going to play with R219 or R131 to see what happens.

Cheers
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File Type: jpg SE Burning Amp 1.jpg (158.1 KB, 127 views)
File Type: jpg SE Burning Amp 2.jpg (144.5 KB, 123 views)
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Old 13th January 2013, 06:24 PM   #280
Zen Mod is offline Zen Mod  Serbia
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you can always put it face down (or up) , on the floor
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clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
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