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Old 21st May 2013, 07:52 AM   #961
kp93300 is offline kp93300  Malaysia
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The ratio of R13/R10 determine the gain. I need a gain of 2X .
If R13 is 47R, do I need to make other changes to the circuit?
Will the heat dissipation in Q3 increased?
thanks

kp93300
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Old 21st May 2013, 07:58 AM   #962
Zen Mod is offline Zen Mod  Serbia
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without signal - no

with signal - practically the same

with 47R for R13 , you'll have more like 4x
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Old 21st May 2013, 08:41 AM   #963
kp93300 is offline kp93300  Malaysia
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ZM
many thanks
order the pcb from the store soon ! New project
kp93300
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Old 21st May 2013, 09:50 AM   #964
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on the B-3 board the connection points are V+,V-,D,G and + in,how does these points connect to the bias board(BA-SB V2.0) as it has S,V+,OUT,D-,D+,V-,D(GS),GND,and OUT(GS),I am using a BA-SO V2.0 for the outputs,All n's 6 fet's for now.
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NS
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Old 22nd May 2013, 11:19 AM   #965
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Default gee no replys,lol

Quote:
Originally Posted by noSmoking View Post
on the B-3 board the connection points are V+,V-,D,G and + in,how does these points connect to the bias board(BA-SB V2.0) as it has S,V+,OUT,D-,D+,V-,D(GS),GND,and OUT(GS),I am using a BA-SO V2.0 for the outputs,All n's 6 fet's for now.
Thanks,
NS

I'll connect the obvious ones and make a educated guess for the rest,lol.
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Old 22nd May 2013, 04:15 PM   #966
oiphy is offline oiphy  Norway
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Quote:
Originally Posted by noSmoking View Post
I'll connect the obvious ones and make a educated guess for the rest,lol.
it's not that hard
you'll figure it out.......
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Old 22nd May 2013, 04:46 PM   #967
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Default and I did too

Quote:
Originally Posted by oiphy View Post
it's not that hard
you'll figure it out.......
It's working good too,great sound!
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Old 22nd May 2013, 07:41 PM   #968
h_a is offline h_a  Europe
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Nice to see there is still interested in the Burning amps
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Old 23rd May 2013, 05:05 AM   #969
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Quote:
Originally Posted by h_a View Post


Nice to see there is still interested in the Burning amps
I got a few of them,Thanks For sharing those (PAPA PASS!) ,with some of your fets in them,lol.2 BA-1,2 BA-3,2 of the F5T's and 2 F5c's Doing well!I have been swapping them in and out of my system at mids,mid bass and high's to see how they sound best,but not much heat they are all water cooled,I enclosed a copper server heatsink's and mounted the fets on them,running Bias @3 amps ,the sinks just get warm,so I'm happy.I am presently moving all of them to a cabinet style rack,I run active 4 ways.I run my computer into a DEC2496 to 2 DCX2496 and into the amps,I got a class D 550 watt for each 18 " sub(Xoc1's) subs ,I haven't tried a B3 there yet ,but I will try 12 fets there per sub soon,I need to wind those transformers for them,all ways something ,lol.
Thanks for the reply!
NS

Last edited by noSmoking; 23rd May 2013 at 05:21 AM.
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Old 28th May 2013, 09:30 PM   #970
generg is offline generg  Germany
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The last two days I played again with the BA-3 Frontend and a crippled F4 behind it.

You all know that Nelson used a Clarity Cap PWA in his build shown in the Forums article.

I found this cap a bit harmless so I tried some more....

- old Obbligato (no gold, no copper, the first one): very lively and articulated, but weaker bass or body than PWA.

- pure KP Cornell Dubilier, too stressing for longer hearing, very articulated

- Silmic II in the middle of all caps, still a really good allrounder!

- Clarity Cap ESA, better deep bass than PWA, upper bass a bit thin, seems to me artificial in the separation of space, HiFi special.... :-)

- Clarity Cap PWA, best 3 dimensional room feeling and right/left seperation, but a bit tame. Very good for longtime hearing.

So my recommendation for my system (Lowther and Tone Tubby)
was either the all rounder Silmic II or PWA!

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