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Old 1st May 2011, 01:31 AM   #11
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Default choices ??

I am considering all possibilities for this triple instead of just using the "standard" Leach circuit. This "sub amp" will also be shared as my "PB150" with audiophile full range use as the design goal. I don't want a restricted bandwidth power stage to detract from the performance of the better modules. The only thing I most likely won't do is use the Jfet CCS , I'm a BJT "purest" (cheeep)

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Old 1st May 2011, 02:06 AM   #12
dimitri is offline dimitri  United States
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choices?? simple
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Old 1st May 2011, 05:13 AM   #13
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Originally Posted by dimitri View Post
choices?? simple
Wow ! Those Russians are doing almost exactly what I propose ,
Click the image to open in full size.
.: SibAudio :. - Усилители -> Высококачественный усилитель мощности "SIBAUDIO-B2"
thanks for link.
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Old 1st May 2011, 07:52 AM   #14
dadod is offline dadod  Croatia
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Originally Posted by lineup View Post
Supertex has spice models for download:
Supertex - SPICE Models
I tried it but LTspice does not recognize it.
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Old 1st May 2011, 07:54 AM   #15
lineup is offline lineup  Sweden
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A pity.
Happens to me in MultiSim, too.
There are models I never get to work.
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Old 1st May 2011, 08:36 AM   #16
dadod is offline dadod  Croatia
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This configuration could be ideal for ThermalTrak output transistors. If predriver and drivers are mounted on the same heathsink its temperature coefficient will canceled and what is left to compensate are output transistor, and that could be done quite simple.
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Old 1st May 2011, 01:43 PM   #17
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If predriver and drivers are mounted on the same heathsink its temperature coefficient will canceled and what is left to compensate are output transistor,
This is a big issue that I have seen dealt with in various ways. Predrivers will not dissipate much more than their class A bias irregardless of load. Drivers and output device junctions will vary wildly in their dissipations depending on source and load (subwoofers especially). To put the whole deal (russian amp above) on the same heatsink , the 3 sets of junctions would directly negate 3 - mur120 (or 3 t-track diodes). A triple OPS does not just require a Vbe that compensates for just 1 junction. If you put the driver/output or just the output on the main HS , you still need a "3 Vbe". Observe the leach amp (only OP's on main HS). Vbe response will be quicker this way , but some negative coefficient must be added to the Vbe to compensate for the ambient room temperature . Some OEM's use a PTC resistor in parallel with the normal C-B resistor of the Vbe or an extra diode junction there for just this purpose.

(below 1 - APT ) is the one type of triple Vbe, using just the single device. (below 2 -luxman) is the luxman with it's 3 diodes. Both the luxman and APT have pre and driver on separate Heatsinks. The luxman's 3 diodes set the negative coefficient for the 3 junctions of the OPS and the non- coupled transistor sest the coefficient for the ambient (room temperature). The luxman will keep 60mA bias from 0C to 40C ambient easily ... superior .
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Old 3rd May 2011, 02:59 PM   #18
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Default another invention of the wheel

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Originally Posted by dimitri View Post
Phoenix Triple?

Rebirth of the Phoenix
ETMC triple?
Bob Cordell Interview: Negative Feedback

Cheers,
E.
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Old 3rd May 2011, 03:09 PM   #19
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Default bias stability

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Originally Posted by dadod View Post
............
Depending on saturation characteristics of I2 and I3 this configuration will yeld higher output swing compared to other triplr output stages.
For best efficiency these current sources could be replaced with bootstrapped resistor loads, although this might result in somewhat reduced bias stability with unregulated power supplies.
...............
Not necessarily, see: Rebirth of the Phoenix

Cheers,
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Old 3rd May 2011, 04:01 PM   #20
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Originally Posted by Edmond Stuart View Post

Welcome back Edmond.

Re-Re invention of the wheel

Pioneer used this topology in more refined version in two or three of their exclusive no global feedback amps back in the 80s.
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