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Pass bjt cascode amplifier from the 70s or 80s..
Pass bjt cascode amplifier from the 70s or 80s..
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Old 16th August 2011, 12:32 PM   #1
GregH2 is offline GregH2  Australia
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Default Pass bjt cascode amplifier from the 70s or 80s..

Does anyone know anything about this amplifier? I would love to have some info about it, especially a schematic! Anyone heard it? Listening impressions?
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Old 16th August 2011, 01:52 PM   #2
rsdio is offline rsdio  United States
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The article is everywhere. Check PassLabs.com, PassDIY.com, FirstWatt.com, ...
Are you looking for information that is not in the article?
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Old 16th August 2011, 02:00 PM   #3
buzzforb is offline buzzforb  United States
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a40 article
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Old 16th August 2011, 02:41 PM   #4
GregH2 is offline GregH2  Australia
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Rsdio,

The cascode article shows a simplified schematic. I want to see the full version, if possible. I am talking about the one that Nelson mentions has been patented. It has a cascaded input, vas and output stage, but the schematic is diagrammatic and does not show the cascode voltages or biasing arrangements.

Buzzforb, the a40 is not a cascode amplifier as far as I can tell.

Any ideas anyone?
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Old 16th August 2011, 07:20 PM   #5
Nelson Pass is offline Nelson Pass  United States
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Pass bjt cascode amplifier from the 70s or 80s..
The article is about cascode amplifiers.

Pass Diy

select projects

scroll down to 1978, "Cascode Amplifier Design"



The products were the CAS-1 and CAS-2 power amplifiers.
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Old 16th August 2011, 08:31 PM   #6
jazz is offline jazz  Netherlands
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Hi,

These are af few schematics posted in the adress below:

THRESHOLD CAS-2 poweramp.

I'd also be interested replacement parts for the transistors used. I've got a case, trannie and some capacitance ready...

regards,
Joris
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Old 16th August 2011, 09:05 PM   #7
rsdio is offline rsdio  United States
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Quote:
Originally Posted by swordfishy View Post
The cascode article shows a simplified schematic. I want to see the full version, if possible. I am talking about the one that Nelson mentions has been patented. It has a cascaded input, vas and output stage, but the schematic is diagrammatic and does not show the cascode voltages or biasing arrangements.
Have you grabbed the patent documents?
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Old 17th August 2011, 01:10 AM   #8
GregH2 is offline GregH2  Australia
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Quote:
Originally Posted by jazz View Post
Hi,

These are af few schematics posted in the adress below:

THRESHOLD CAS-2 poweramp.

I'd also be interested replacement parts for the transistors used. I've got a case, trannie and some capacitance ready...

regards,
Joris
Thanks Jazz, this is what I have been looking for!
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Old 17th August 2011, 01:16 AM   #9
Nelson Pass is offline Nelson Pass  United States
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Pass bjt cascode amplifier from the 70s or 80s..
Quote:
Originally Posted by rsdio View Post
Have you grabbed the patent documents?
There is no patent of mine referencing the circuit.

It's just the usual ways of cascoding circuits, at this time nothing you
haven't seen before.

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Old 17th August 2011, 01:20 AM   #10
Nelson Pass is offline Nelson Pass  United States
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Pass bjt cascode amplifier from the 70s or 80s..
Quote:
Originally Posted by jazz View Post
Hi,I'd also be interested replacement parts for the transistors used.
The outputs were 2n5878 and 2n5876, the inputs were 2n6571 and the
rest of the to92 were MPSL01 and MPSL51 if I recall correctly.

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