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Old 12th December 2011, 08:31 PM   #111
Variac is offline Variac  Costa Rica
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So you (and Papa) are saying that even with the canceling of 2nd harmonic due to balanced construction, playing with P3 can still affect the sound and specs significantly?

Originally Posted by Zen Mod View Post
you have symmetry effect between halves due to common 200 ohms resistor and overall effect of bridging .
if Papa sez that invoking 2nd harmonic can still be higher than symmetry effects , I'm not doubting that ....
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Old 12th December 2011, 09:03 PM   #112
Zen Mod is online now Zen Mod  Serbia
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well - that's at least how I understood what Papa was writing
my Papa is smarter than your Nelson !
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Old 20th February 2012, 03:39 PM   #113
biju55 is offline biju55  India
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Default BA-3b (Balanced)

BA-3B + BA-2 = XA 30.5 ?

Last edited by biju55; 20th February 2012 at 03:53 PM.
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Old 20th February 2012, 03:42 PM   #114
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Different circuit.

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Old 20th February 2012, 04:02 PM   #115
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Originally Posted by biju55 View Post

BA-3B + BA-2 = XA 30.5 ?
BA-3B is not SUSY, so not possible.
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Old 20th February 2012, 04:29 PM   #116
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I think it's a riddle.

(not that me know the answer)
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Old 20th February 2012, 06:38 PM   #117
generg is offline generg  Germany
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I can only say that I like, nearly similar like Botte, the sound of the BBA-3 most when both types of distortion are nearly equal.....

best of both worlds for my ears.......

may be they only like to resonate on more than one frequency.......
and the First Wtt is......a really First Class PSS Idea
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Old 12th March 2012, 02:17 PM   #118
Darry is offline Darry  France
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The BA3 Front End can be connected either with BA-1 or BA-2 output stages.

The BA3 Front End with BA-1 output stage (+ / -32 volt rails) : output power limited to 50W into 8 ohms, 25W into 4 ohms, 12 W on 2 ohms.

I think that the balanced BBA3 Front End (+ / -32 volt rails) must be connected with the official BA # 2 push-pull output stage.pour get close to 200W into 8 ohms.

I think that the balanced BBA3 with official output stage BA-1 (+ / -32 volt rails) will always be the power of 50W into 8 ohms, 25W into 4 ohms, 12 W on 2ohms.

I'm right?

Thank you for your answer


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Old 12th March 2012, 04:40 PM   #119
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I think that the balanced BBA3 Front End (+ / -32 volt rails) must be connected with the official BA # 2 push-pull output stage.pour get close to 200W into 8 ohms.

Hi, Jean-Luc.

200W classA! What a dissipation!

Provided you bias the output stages twice as much as the 50w unbalanced version.

Or do you mean 50w classA only, 200W classAB?

Last edited by bobodioulasso; 12th March 2012 at 04:47 PM.
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Old 13th March 2012, 08:28 PM   #120
JimM is offline JimM  United States
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In simulation with +/- 32 volt supplies I get a peak to peak swing of around +/- 45 volts from the front end so Vrms = 31.82volts and p= vrmsxvrms / RL or around 126.5 watts for 8 ohm and around 253 watts for 4 ohm. This is with BA2 P-P back end and with ideal values, but you should get around 100 watts at 8 ohms and 200 watts at 4 ohms. This is with a bias of around 12 to 15 watts class A and then into Class AB unless you have really really big heat sinks.
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