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P3A oscillation
P3A oscillation
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Old 18th November 2006, 09:14 PM   #21
01001101 is offline 01001101  Slovenia
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Join Date: Mar 2005
Location: Slovenia
Thanks for this valuable info.

This is probably a stupid question, but can BD140 be used as VAS in the P3A with +/-42V rails?

thanks.
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Old 18th November 2006, 11:31 PM   #22
clem_o is offline clem_o  Philippines
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Join Date: Jun 2005
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No, the BD140 is spec'd for a Vceo (max) of 80V. It's at its limit with the supply voltages as originally spec'd, +-35V.

Cheers!
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Old 18th November 2006, 11:58 PM   #23
clive299087 is offline clive299087  United Kingdom
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Join Date: Aug 2004
Location: Gloucestershire
I agree. I ended up with MJE350's as they have higher voltage rating. Just one other improvement
(I think!) I made was to remove C6, as the .1uF between the driver bases makes it
redundant (Thanks Wavebourne!)
Have now tried A/B switch to compare P3A's with P101's.
To my ears, they sound identically excellent!
Now trying to get the courage to tear my Cambridge R50 T/L's
to pieces and try bi-amping them...one day...!
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