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Old 23rd May 2011, 03:29 PM   #21
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Quote:
Originally Posted by wg_ski View Post
I'm pretty sure the RCA device came first. And of course the 3055 before 3773 - they issued the part numbers in sequence until complementary pairs messed this all up.
In that time, various types was divided into groups resp. families by RCA (see also PDF attachement):
1) 2N3771 Family (related audio type = 40411)
2) 2N3773 Family
3) 2N3879 Family and for small/medium signal applications
4) 2N4036 Family

In this case this threads could be also of interest:

http://music-electronics-forum.com/a...4151-40408.pdf
old RCA transistors- what are they?
Popular Electronics February 1967
Vintage Brute-70 (40411) clone
Best transistor substitutes for Heathkit ar-15

To find detailled information concerning the exactly line up of history all folders and databooks from RCA between 1963 and 1975 are necessary. Later released Follower devices was the BD550 series and the BD750 series; from this series I have various papers and the same I want to have from 2N3055 and 2N3773 and the associated types
Attached Files
File Type: pdf RCA 2N3771 Family - 2N3773 Family.pdf (48.0 KB, 229 views)
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Old 24th May 2011, 07:40 AM   #22
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There's a very interesting article in the Bob Pease book Troubleshooting Analog Circuits ( pages 84-85) regarding the 2N3055 Hometaxial, Epitaxial and the new Planar manufactured devices.

The Original 60's 3055 was a Hometaxial part and and was single diffused, however this process took up to 20 hours, which made it very expensive though the parts were the most rugged on SOA. In the late 70's and 80's 2N3055's made this way would have an H after the part number.
Epitaxial parts are faster cheaper to manufacture and have better characteristics except for ruggedness, and the Planar moves the game on another step. Most 3055's are likely to be made with the Epi process, the faster and newer parts such as 3281's etc with Planar and multiple emitter technology.

So the old school 3055's and 3771's were tougher than modern counterparts due to their construction however they were also slower.

If you want to get some of the original Hometaxial devices from this era then I'd hunt down the old aluminium base Motorola parts, or the RCA 1Axx and 1Bxx Audio specific transistors from around 1970.
As far as I know no one has faked these as there isn't the demand for them.
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Old 24th May 2011, 12:16 PM   #23
AndrewT is offline AndrewT  Scotland
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the 3773 is a very robust 150W To3. Your 3055 hometaxial explanation may apply here as well.

The 3773 must be the only 150W device that is guaranteed (100% testing) to do 1.5A @ 100Vce
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Old 24th May 2011, 04:08 PM   #24
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The change in production process explains wht a lot of the old 60's and 70's amps pop modern output devices unless uprated parts such as MJ21193's are fitted..
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Old 22nd July 2012, 05:38 PM   #25
farjon is offline farjon  Brazil
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Another try... I didn't build it.

DIY Power Amplifier Project
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Old 23rd July 2012, 06:38 AM   #26
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Quote:
Originally Posted by gordy838 View Post
There's a very interesting article in the Bob Pease book Troubleshooting Analog Circuits ( pages 84-85) regarding the 2N3055 Hometaxial, Epitaxial and the new Planar manufactured devices.

The Original 60's 3055 was a Hometaxial part and and was single diffused, however this process took up to 20 hours, which made it very expensive though the parts were the most rugged on SOA. In the late 70's and 80's 2N3055's made this way would have an H after the part number.
Epitaxial parts are faster cheaper to manufacture and have better characteristics except for ruggedness, and the Planar moves the game on another step. Most 3055's are likely to be made with the Epi process, the faster and newer parts such as 3281's etc with Planar and multiple emitter technology.

So the old school 3055's and 3771's were tougher than modern counterparts due to their construction however they were also slower.

If you want to get some of the original Hometaxial devices from this era then I'd hunt down the old aluminium base Motorola parts, or the RCA 1Axx and 1Bxx Audio specific transistors from around 1970.
As far as I know no one has faked these as there isn't the demand for them.
Thank you for this advices.
mean you this book from follow URL?
Troubleshooting Analog Circuits - Robert A. Pease - Google Books
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Old 23rd July 2012, 12:39 PM   #27
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That's the book, it's very good.
Ignore the review on that google books url, I'm guessing the guy who wrote it doesn't know much about the late Bob Pease who I consider to be a bit of an Analogue Guru, as do many other designers and engineers.

Analog engineering legend Bob Pease killed in car crash | EDN
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Old 23rd July 2012, 08:28 PM   #28
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thank you for the URL.
check out post #22 and 23 about
The best audio amplifier books - Overview (Google books)
and
Bob Pease RIP
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Old 23rd July 2012, 11:10 PM   #29
djk is offline djk
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"The 3773 must be the only 150W device that is guaranteed (100% testing) to do 1.5A @ 100Vce "

Yes, and the 2N6259 is the only 250W device that is guaranteed (100% testing) to do 2.5A @ 100Vce.
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Old 25th July 2012, 10:32 PM   #30
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Ah but.... the 2N3773 family (these were introduced by RCA BTW) have a poor frequency response. ALthough the 40411 (a 2N3772 based device) is quoted as "800kHz typical" (which is minimum for the 2N3055) the worst case is 200kHz for the old hometaxial device.

Does not make a hifi amp.

The MJ21194/MJ21193 can do almost the same SOAR (these are about the best around) but have 4 MHz fT's ... much better.

John
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