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Old 12th January 2013, 12:08 AM   #31
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TI was the originator of the TIP series of power transistoer (back when they still made them). ON semiconductor, ST and Fairchild are still good suppliers, so supply is not really an issue. Keep in mind that Fairchild does a couple of package variations of the part, one in a standard TO3P package and another version looking similar to a TO-247, but requiring an M3 screw for mounting. This is a PITA for us US types, but a plus is that that package doesnt require a shoulder washer, unlike the TO3P

There is also nothing stopping one from using TO-3 devices like the 2N6283 and 2N2287 for output devices - ON semi still makes them, and Digi-key stocks them...
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Old 12th January 2013, 12:25 AM   #32
6L6 is offline 6L6  United States
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Quote:
Originally Posted by osscar View Post
its works fine even with 24V rails and you can bias it for 1A and adjust gain.
Does it work at 60v rails?

I have a couple of transformers I would love to use...



Quote:
Originally Posted by wrenchone
Keep in mind that Fairchild does a couple of package variations of the part, one in a standard TO3P package and another version looking similar to a TO-247, but requiring an M3 screw for mounting. This is a PITA for us US types, but a plus is that that package doesnt require a shoulder washer, unlike the TO3P
This datasheet from Mouser shows that the package is a TO-247 http://www.mouser.com/ds/2/389/CD00000914-20927.pdf

I mention this not to be argumentative in any way, merely to show that we might not need to deal with a weird package.

Quote:
There is also nothing stopping one from using TO-3 devices like the 2N6283 and 2N2287 for output devices - ON semi still makes them, and Digi-key stocks them...
Nice! Are those intended replacements, or just extremely similar?

Also, is there a different suitable transistor to use in place of the 2SA1110 and 2SC2590?

Last edited by 6L6; 12th January 2013 at 12:37 AM.
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Old 12th January 2013, 12:54 AM   #33
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Originally Posted by 6L6 View Post
Also, is there a different suitable transistor to use in place of the 2SA1110 and 2SC2590?
I don't know, as I pay little attention to what's out there in Bipolars these
days (that said, we just made a 10 year buy on the closeout of some
Toshiba's).

Those parts were chosen because I had stock courtesy of the boys at Adcom
and knew that the probable OEM used them.

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Old 12th January 2013, 01:07 AM   #34
6L6 is offline 6L6  United States
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"...made a 10 year buy on the closeout..." - I.E., you are getting the factory spun up for one last hurrah, eh?


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Old 12th January 2013, 01:24 AM   #35
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A big thank you Nelson for this gift

This amp looks reliable and quite CHEAP to build ))
this would be a good example of a polite responce.

notice the thankyou for somthing we where given, and after a complment was given.

i would like to echo this and, remind those that perhaps forgot that this was somthing that nelson would have made money from and was given to us free.

the impolite thing to do would be to express dissapointment. in either the pick of topolagy, devices, or the color of boxers he had on when he drew up the blue prints.........
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Old 12th January 2013, 01:55 AM   #36
Mr. dB is offline Mr. dB  United States
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So who's doing the board layout?
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Old 12th January 2013, 02:02 AM   #37
evette is offline evette  Canada
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How many transistors would you like Mr. Sakis I have the Orginal Onsemi,s. Evette
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Old 12th January 2013, 02:48 AM   #38
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As for the Fairchilld "TO-247" part, you have to be careful - Mouser is not always accurate. A real TO-247 part will take a 6-32 mounting screw - the Fairchild parts I encountered will not, even though they look superficially like a std TO-247. Then again, maybe there are 3 versions out there - TO3-P (requires insulating shoulder washer), real TO-247 (no washer, 6-32 mtg), and "TO-247 variant" which needs an M3 screw. Of course, an M3 will work on both the TO-247 and the variant, but I'm in the US of A, where metric screws, though available, are still kinda weird. IXYS also has some parts in the variant case.
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Old 12th January 2013, 03:06 AM   #39
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The ST data sheet I downloaded calls the package a TO-247. The hole is 3.55mm minimum which should clear a 6-32. I really hate tapping 4-40 holes !!!
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Old 12th January 2013, 03:38 AM   #40
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Maybe the vendors are consolidating package types, as the real TO-3P parts were always kinda weird, and TO-220/TO-247 is the de facto standard for power devices these days. They can do this, as well as monkey with other parameters, as the TIP parts were not registered with JEDEC.

All the old On Semi and ST parts (and of course, TI) I have are TO-3P. The Fairchild data sheet I accessed shows a hole that will just barely clear an M3 screw. Of course, an M3 screw will work with the Fairchild part as well as a std TO-247.

P.S. I hate tapping M3 holes...

Last edited by wrenchone; 12th January 2013 at 03:57 AM.
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