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Old 25th November 2011, 09:51 PM   #1
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Default Humble Beginnings:D

Here is the beginnings of my BA modular setup. Included pic is raw unfinished case for BA3B FE. There will be matching case with OPA1632 as well as Salas Shunt reg for each. I was going to power FE's with umbilical from BA output, but decided to change. Each monoblock poweramp will have its own standalone PSU with soft start diodes and 54000uF of caps. THis will be connected to main power amp through Speakon umbilical just like FE/Pre. In main power amp case, there will be another 36000uF of caps and output boards, nothing else. I am in the middle of trying IRF vs Renasas laterals. I may try the Fairchild as well. I will not use 3 output pairs because I just don't need the power and will instead heavily bias a single transistor pair or 2P and 2N per monoblock. Hope to have pics start to role in of different cases. I normally just build a partial enclosure like last pic (Jumas F5 version) and listen for couple of months. The boss said it was time to finish something, so the journey begins.
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Old 25th November 2011, 10:20 PM   #2
Zen Mod is offline Zen Mod  Serbia
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I'm glad , from two reasons :

1- you have a helper

2- you included a helper in pic

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Old 25th November 2011, 11:04 PM   #3
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Thanks. I actually have 4 helpers
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Old 25th November 2011, 11:07 PM   #4
Zen Mod is offline Zen Mod  Serbia
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put them all in pic

who cares for gadgets ....

in other words - it's easy to enjoy in building anything , when you have them

( OK , I know - they have you , but that's how things are going )
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Old 25th November 2011, 11:26 PM   #5
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Quote:
Originally Posted by buzzforb View Post
Thanks. I actually have 4 helpers
Perhaps the next generation of diyAudio nutz to follow us???
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Old 26th November 2011, 12:01 AM   #6
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Listening to Vince Guaraldi as we speak. Little indoctrination. I love this time of year!
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Old 26th November 2011, 12:35 AM   #7
Zen Mod is offline Zen Mod  Serbia
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tnx !

now you can proceed with those boring tech pics

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Old 26th November 2011, 10:48 AM   #8
juma is offline juma  Germany
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Quite a crew you got there buzz !

Congratulations!

PS - watch for the guy in blue PJ - he's up to some mischief
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Old 26th November 2011, 10:53 AM   #9
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Thanks Juma. That is your unfinished F5. I started listening and never got around to finishing it. We make the youngest boy wear the helmet for his own protection. He is going to work in explosives and demolition
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Old 26th November 2011, 12:19 PM   #10
generg is offline generg  Germany
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Fine Youngsters! Happy to see them!

When I modified F4 I choose three pairs, two pairs, one pair ..... Of course always changing bias to the same amount. And the sound difference is clearly to hear ....... One pair is on the very bright side, much details but less body only the Toshibas convinced me in the one pair configuration.
So two or three pairs are not bad......in my opinion. Three pairs of IRF can be a bit dark, three pairs of FQA sound brighter and have the best balance.

But of course what you need is totally dependend on the other players in the chain, speaker, cd- player ........

But exactly this advantage to match the complete chain to the sound I like is one of the nice aspects of DIY.
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