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Old 17th November 2012, 04:32 PM   #3501
Zen Mod is offline Zen Mod  Serbia
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5W=U^2/50R

5W x 50R=U^2
(5W x 50R)^1/2=U

=15V8 RMS = 44V7p-p

what means that you need even slightly higher rails for that F4

30db gain means (30/20)inv-log = around 31 x

so , with 2 in , you'll get 62 out ........ if stage is not clipping before that

using balanced will double possible swing , but gain remains the same
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Old 17th November 2012, 04:41 PM   #3502
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Default For those who have played a lot with F4

What is the best preamp/driver for it?
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Old 17th November 2012, 04:53 PM   #3503
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http://tinyurl.com/cprv8x6

but custom version , with higher gain

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Old 17th November 2012, 06:17 PM   #3504
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Quote:
Originally Posted by Zen Mod View Post
XP-30 - Passlabs

but custom version , with higher gain

Any hint with topology, mosfet used, number of stage, etc?
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Old 17th November 2012, 06:21 PM   #3505
6L6 is offline 6L6  United States
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Quote:
Originally Posted by Zen Mod View Post
so , with 2 in , you'll get 62 out ........ if stage is not clipping before that
But there is no way you can swing more than the rails, right? So the gain stage would have to be the higher voltage version with 32v rails...
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Old 17th November 2012, 06:21 PM   #3506
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@ Jay

ask Wayne .......

make BA-3 FE
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Old 17th November 2012, 06:22 PM   #3507
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Quote:
Originally Posted by 6L6 View Post
But there is no way you can swing more than the rails, right? So the gain stage would have to be the higher voltage version with 32v rails...
at least
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Old 17th November 2012, 06:32 PM   #3508
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Quote:
Originally Posted by Zen Mod View Post
@ Jay

ask Wayne .......

make BA-3 FE
Oh... BBA3 with excessive bias for the mosfet... Ok, thanks
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Old 18th November 2012, 11:09 PM   #3509
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Dear zen mod

Another stupid question, do you ever measure Your P1 ?

What is different between B1, B2 and B3 ?

Which one better go for double F4 or F4 with B1/2/3 ?
For 87 db speaker

thank you, best regards
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Old 18th November 2012, 11:14 PM   #3510
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Quote:
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Dear zen mod

Another stupid question, do you ever measure Your P1 ?
clarify

Quote:
Originally Posted by Pocoyo View Post
What is different between B1, B2 and B3 ?

you mean on First Watt B1, B2 , B3 ?
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