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1970s Design Indulgence
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BAK View Drop Down
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Points: 1744 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BAK Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jul 2020 at 11:48am
Is it possible the prefix of "MJ" in transistor part #s like MJxxxxx is representing "Morgan Jones" contribution to transistor technology?



Edited by BAK - 22 Jul 2020 at 11:50am
Bruce
AT-14SA, Pickering XV-15, Hana EL, Technics SL-1600MK2, Lautus, Majestic DAC, Technics SH-8055 spectrum analyzer, Eminence Beta8A custom cabs; Proprius & Reflex M or C, Enjoy Life your way!
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Points: 16298 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jul 2020 at 11:59am
Originally posted by BAK BAK wrote:

Is it possible the prefix of "MJ" in transistor part #s like MJxxxxx is representing "Morgan Jones" contribution to transistor technology?



For example: MJL (Morgan Jones lacking... ) Wink
That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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Points: 1744 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BAK Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jul 2020 at 12:19pm
Originally posted by Graham Slee Graham Slee wrote:

Originally posted by BAK BAK wrote:

Is it possible the prefix of "MJ" in transistor part #s like MJxxxxx is representing "Morgan Jones" contribution to transistor technology?



For example: MJL (Morgan Jones lacking... ) Wink

Or is it more like "multiple junction" technology in using epitaxial construction?
Bruce
AT-14SA, Pickering XV-15, Hana EL, Technics SL-1600MK2, Lautus, Majestic DAC, Technics SH-8055 spectrum analyzer, Eminence Beta8A custom cabs; Proprius & Reflex M or C, Enjoy Life your way!
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Points: 1744 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BAK Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jul 2020 at 12:33pm
Originally posted by Graham Slee Graham Slee wrote:

If it's reliability you're after, this amplifier has it in piles!

Provided you don't do anything stupid, this amplifier will accept hundreds of modifications, without going into self destruct. It will put up with a dead short on one channel, while "complaining like hell" on the other channel!

And it's because the output transistors are tough, really tough, like overcooked beef steak tough. 
 Are you putting the DAK amp through some torture tests?
Bruce
AT-14SA, Pickering XV-15, Hana EL, Technics SL-1600MK2, Lautus, Majestic DAC, Technics SH-8055 spectrum analyzer, Eminence Beta8A custom cabs; Proprius & Reflex M or C, Enjoy Life your way!
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Points: 16298 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jul 2020 at 12:40pm
Originally posted by BAK BAK wrote:


Or is it more like "multiple junction" technology in using epitaxial construction?



More like a bloody cock-up if left to counterfeiters...

Crystal epitaxy deposition is a multiple stage process involving photo-masking, etching, mask-stripping, photo-masking, deposition, mask-stripping, photo-masking, etching, repeat, repeat, repeat, ad infinitum.

My experience of photo-masking only went down to thou level (printed circuit boards) and water or air impurities were enough to scupper a production run.

Today, we have microscopic crystal lattices deposited over a perforated emitter layer, which since 2014 has been entrusted to a people ruled by a dictatorship that can't even get Marxism the right way up!
That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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Or to put it another way...

Anything which takes the crap generated by an output stage constructed like the compact cassettes they used to make, and uses it to control gain, by feeding it back, or to assist in gain by bootstrap constant current, is adding (yes even in negative feedback) to the dynamic distortion.

Tell me a time when a dictatorship was interested in any freedom? One freedom being music!
That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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Points: 1744 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BAK Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jul 2020 at 12:46pm
Originally posted by Graham Slee Graham Slee wrote:

Originally posted by BAK BAK wrote:


Or is it more like "multiple junction" technology in using epitaxial construction?



More like a bloody cock-up if left to counterfeiters...

Crystal epitaxy deposition is a multiple stage process involving photo-masking, etching, mask-stripping, photo-masking, deposition, mask-stripping, photo-masking, etching, repeat, repeat, repeat, ad infinitum.

My experience of photo-masking only went down to thou level (printed circuit boards) and water or air impurities were enough to scupper a production run.

Today, we have microscopic crystal lattices deposited over a perforated emitter layer, which since 2014 has been entrusted to a people ruled by a dictatorship that can't even get Marxism the right way up!


and counterfeiters are many... makes it harder to find any good semiconductors!
Bruce
AT-14SA, Pickering XV-15, Hana EL, Technics SL-1600MK2, Lautus, Majestic DAC, Technics SH-8055 spectrum analyzer, Eminence Beta8A custom cabs; Proprius & Reflex M or C, Enjoy Life your way!
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