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Old 9th March 2005, 08:53 PM   #1
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Default 3 Different Outputstage Driver Arrangements, Your Opinions!

Hi Guys,

attached is a schematic with 3 similar output stages, the only difference is the resistor arrangement around the output driver stages.

I would like to know whats your opinion about these 3 different arrangements, pros and cons.

Especially myself wondering why type C is so selldom seen in amplifier designs, at least typical symmetrical designs use to have type A or B as an output driver stage.

Cheers Michael
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File Type: jpg different outputstage driver arrangements 09032005.jpg (68.5 KB, 1807 views)
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Old 10th March 2005, 01:20 AM   #2
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Type B is recomended by Dougself over type A. He said type B has a better transistor-turnoff properties, due to crossing resistor.
I don't know if I'm wrong, but type A seems to sound better for me in low biased classAB (cold amp).
Type C commonly found in Elektor's power amp design, usually from Mr. T. Giesberts.
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Old 10th March 2005, 11:34 AM   #3
jaycee is offline jaycee  United Kingdom
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Type B is the "Triple Darlington" stage used in the Leach Amp. Both the predriver and driver transistors run in Class A (IE they never turn off thus reducing crossover distortion). This is the output stage I use the most.

Type A is really just a predriven Emitter Follower stage, and the predrivers/drivers run in class AB.

Pass on type C but I have seen it used on the Cyrus One.
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Old 10th March 2005, 11:48 AM   #4
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Crown Audio uses type C,
they say its Class AB+B.

the Lynx Amp uses type A.

Leach uses Type B.

and some Rotel amps uses Type B,

I did some listening tests to both B and C on my cloned and modified
RB1090 rotel amp.
Type C delivers tighter bass and smoother highs.
Type B produces a bit grainy bass but highs same as Type C.

But the final soundstage still depends on the builder.

more power,


hienrich
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Old 10th March 2005, 11:51 AM   #5
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Hi Michael,

I would go for TYPE C, because its actually CLASS-AB+B.
In this configuration the prediver is baised in Class-A, driver in Class-AB and output is biased in Class-B. This topology yields maximum efficiency and sounds good , more reliable in professional amplifiers.

regards,
kanwar
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Old 10th March 2005, 12:02 PM   #6
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And whatabout combination A + B ?
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Old 10th March 2005, 12:03 PM   #7
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actually Type C has a higher Damping factor that which
controls the speaker cone movement
making it tighter and dynamic to here....

hienrich
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Old 10th March 2005, 12:23 PM   #8
uli is offline uli  Austria
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phantastic how everybody can determine if the stages run in
class A, AB or B just by topology without having any resistor
values available.



Uli

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Old 10th March 2005, 12:54 PM   #9
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Cool formal

Quote:
Originally posted by uli
phantastic how everybody can determine if the stages run in
class A, AB or B just by topology without having any resistor
values available.



Uli

Hi Uli,

Tell me one thing..??

ARE you "ULI-BEHRINGER" CEO of BEHRINGER , Germany.

The pro-guy.

regards,
Kanwar
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Old 10th March 2005, 01:15 PM   #10
sajti is online now sajti  Hungary
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I use mainly B version, but I had one amplifier with mixed B&C version, due the small SOA of the drivers.

sajti
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