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Old 17th January 2013, 02:20 AM   #931
Jason is offline Jason  Australia
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Quote:
Originally Posted by danielutzu View Post
Does anyone know where I can get a BA-3 PCB? The diyaudio store is out of them...

thanks,
Daniel
There is actually a bunch en-route. They will be in the US store within a week or two I think.
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Old 29th January 2013, 06:14 AM   #932
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Hi all,
I know there is a thread running for this so If it needs moved,Mods Please do,Thanks!
I read a post about Fake parts in particular the sk 170 and bj 74,well my curiosity got me and I start taking that info and looking at a few parts I have,It seems to be the truth that there is a small amount of copper showing on the pins at the trans body,I have some from know good suppliers and ah well some other suppliers,I have recieved good ones from major US suppliers and I have ordered from 2 overseas suppliers that are good,I have ordered from Spencer and Alweit on ebay,got 'em here fast and the real McCoy's,I didn't get a reply from Zoufang,maybe someone can call that ball,
I am waiting on heatsinks and then I can fire up my B-3,LOL.
Just my 2 cents,
NS
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File Type: bmp Fake parts (WinCE).bmp (84.4 KB, 140 views)
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Old 12th March 2013, 06:20 AM   #933
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Quote:
Originally Posted by Zen Mod View Post
there are some possibly better alternatives , but even more unobtanium

2SK213/2SJ76
2SK214/2SJ77

for instance

Hi ZM
1. can i use 2sk216/2sj79?

2. 2sj76/77/78/79 and 2sk213/214/215/216
it seem to be one series parts. Can i use mixed pair? ex. 2sj77/2sk216

3. All of these parts are old, but i see some brand new in my local.
Is there a simple way to test the fake part?
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Old 12th March 2013, 10:13 AM   #934
Zen Mod is offline Zen Mod  Serbia
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same parts , different voltage grades ;

without looking at datasheets , I'm expecting somewhat higher parasitic capacitances for higher voltage ones , but - if you don't have other choice - mix them

no big deal

those are nice parts

testing - Mosfet testing - pdf - Pa's site

see in datasheets what values you can expect
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Old 13th March 2013, 07:20 PM   #935
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ZM, thanks a lot.

After seeing your resp, goto the local immediately.
my two pair of 2sk216/2sj79 was flying away.
it is so pitty really.
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Old 14th March 2013, 07:09 PM   #936
generg is offline generg  Germany
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Why not order from alweit?

alweit | eBay

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Old 18th March 2013, 11:13 AM   #937
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Hi generg, thanks for offer the source. if i can't find on the local then i will order it.

Today, i got two pair of 2sk214/2sj77. Finally i can try to build the BA-3.
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Old 5th April 2013, 06:54 PM   #938
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Great, yesterday i had finsihed BA3 FE, with a green one (j77)and a black one(k214).
ps +-17.1v, the bias is 66ma.

Take it as a pre to my little tube amp, it sounds good.

Next will build BA1 output stage, can't wait to hear the voice of BA3+BA1.

Or try BA3+F4 first, to see what happen.
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Old 5th April 2013, 07:02 PM   #939
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Old 8th April 2013, 08:40 AM   #940
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Can diode trick work with BA-3 PP output like implemented in F5T?
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