3 Different Outputstage Driver Arrangements, Your Opinions!

Ultima Thule · 9th March 2005, 08:53 PM

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

lumanauw · 10th March 2005, 01:20 AM

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.

jaycee · 10th March 2005, 11:34 AM

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.

hienrich · 10th March 2005, 11:48 AM

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

Workhorse · 10th March 2005, 11:51 AM

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

Upupa Epops · 10th March 2005, 12:02 PM

And whatabout combination A + B ?

hienrich · 10th March 2005, 12:03 PM

actually Type C has a higher Damping factor that which
controls the speaker cone movement
making it tighter and dynamic to here....

hienrich

uli · 10th March 2005, 12:23 PM

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

Workhorse · 10th March 2005, 12:54 PM

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

sajti · 10th March 2005, 01:15 PM

I use mainly B version, but I had one amplifier with mixed B&C version, due the small SOA of the drivers.

sajti

10th March 2005, 11:51 AM	#5
Workhorse diyAudio Member Join Date: Dec 2004	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 __________________ It's a fruitless endeavor to try and educate a fool that rejoices in ignorance

10th March 2005, 12:23 PM	#8
uli diyAudio Member Join Date: Dec 2002 Location: Vienna, Austria	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 __________________ 'Jazz is not dead, it just smells funny' F.Zappa

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10th March 2005, 01:20 AM	#2
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	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.

10th March 2005, 11:34 AM	#3
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	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.

10th March 2005, 11:48 AM	#4
hienrich diyAudio Member Join Date: Dec 2004 Location: City of Gentle People	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

10th March 2005, 12:02 PM	#6
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	And whatabout combination A + B ?

10th March 2005, 12:03 PM	#7
hienrich diyAudio Member Join Date: Dec 2004 Location: City of Gentle People	actually Type C has a higher Damping factor that which controls the speaker cone movement making it tighter and dynamic to here.... hienrich

10th March 2005, 01:15 PM	#10
sajti diyAudio Member Join Date: Apr 2003 Location: Vác, Hungary	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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