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Old 7th July 2014, 07:06 PM   #141
Zen Mod is offline Zen Mod  Serbia
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two facts :

- sch was prepared for commercial project

-Pa published it here

what else ?

maybe stick to someone's bum ...........

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Old 7th July 2014, 07:42 PM   #142
Bigun is offline Bigun  Canada
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maybe stick to someone's bum ...........

What
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Old 7th July 2014, 07:43 PM   #143
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The A40 uses Darlingtons and a very similar front end.
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Old 7th July 2014, 09:06 PM   #144
Bigun is offline Bigun  Canada
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ah !
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Old 7th July 2014, 09:47 PM   #145
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I only made one A40 only for testing and learning from
Even though what i made was a crappy job and kitchen table style with almost poor choice of parts the A40 was a solid rock and free from many of known problems existing in consumer amps that feature one pair of Darlingtons that tent to blow very easily .

To advance this a bit farther i will have to include the A40 in the world wide unique output stages since A40 is the only amp ( that i know ) that has multiple Darlingtons in the output .

In the same family ( and world wide unique )you have the Alchemist Forseti which is a CFP with double the CFP thing on the output with in total 4 outputs with 4 drivers per CH .It is known that APD 15 run into stability probs and band aids of 680 pf had to be placed in the output to prevent blowing .

In the same family you Have Nakamichi PA 7 Stasis from NP which also is unique since features CFP output but with many external transistors (10 i think ) also solid rock extremely reliable ( except some soldering issues but this will happen after 30 years !!! ) that also playes very well and has no band aids in the outputs .

Now Do the math why consumer amplifiers with darlingtons fail all the time??? Anythings that is based on TIP 142-147 or BDV 66-67 will eventually fail ..Denon Philps red circuits Kapibara The Notorious John Fisher sorry excuse of an amplifier with catchy title and many more fail like mosquitoes.... Not to forget latest techniques with SAP 15 working just a bit better but still with a huge history of failure .

Why APD 15 run in to stability problems ???

What is common between the A40 stability and the NAk PA7 stability ?

One and only thing called Bias !!!
Run them HOT and they are going to be stable !!
...This is what i think .. I would like to have NP's opinion on that

Kind regards
Sakis
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Old 8th July 2014, 11:26 AM   #146
AndrewT is offline AndrewT  Scotland
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The A40 uses Darlingtons ...............
Darlington?
or double EF?
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Old 8th July 2014, 11:37 AM   #147
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Double Darlington transistors Andrew in EF configuration
That in a way is common with the Alchemist since its world wide unique and features 4 outputs and 4 drivers per ch

Kind regards
Sakis
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Old 8th July 2014, 11:42 AM   #148
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What's a Double Darlington?
An IC with four transistors inside?
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Old 8th July 2014, 12:02 PM   #149
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Andrew get your self a cup of coffee and a schematic

The A40 features 2X TIP142 and 2XTIP147 in the output stage that makes 4 transistors in the output that inside of them include 4 drivers ...
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Old 8th July 2014, 07:28 PM   #150
Bigun is offline Bigun  Canada
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I am sorely tempted to spin up a pcb, amp-camp style, for a power Darlington output designed to be run in Class AB as I can see myself making use of it.
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