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Old 27th August 2005, 06:53 PM   #1
gtrtech is offline gtrtech  United States
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Default confused

I am working on a amp that has 2 mj15022 npn transistors but the schematics say the pnps on the other side are mj15002 and not mj15023. I wonder why this is and can i use the mj15023 instead.
Tony
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Old 27th August 2005, 07:03 PM   #2
MikeB is offline MikeB  Germany
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schematics ?
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Old 27th August 2005, 07:20 PM   #3
gtrtech is offline gtrtech  United States
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Mike
Here is a link to most of them, email me if you need the othersCS 8ooX schematic
Thanks
Tony
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Old 27th August 2005, 08:51 PM   #4
MikeB is offline MikeB  Germany
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I would say, ask the guys that were helping you last time, it's very
likely to be a typo and that it has to be mj15023, but i am also not 100% sure...
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Old 28th August 2005, 12:37 AM   #5
gtrtech is offline gtrtech  United States
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beleave it or not I pulled the mj15002's out of it so it's not a typo, I wonder why they used those.
thanks
Tony
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Old 28th August 2005, 02:22 AM   #6
mcp is offline mcp  United States
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The CS800 is quasi-complementary, all npn at the outputs. I have not seen the "X" version, but it is probably similar.

Have they scaled down the outputs? The CS800 had a total of 10 power transistors, 5 on either side.
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Old 28th August 2005, 03:45 AM   #7
gtrtech is offline gtrtech  United States
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This is for a Crate pfx6, I started the other thread talking about a cs800 which then led into the problems I'm having with the crate( which the schemaitics are for)
Sorry for any confusion
Tony
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Old 28th August 2005, 07:22 AM   #8
mcp is offline mcp  United States
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Hi Tony

I see what you mean. That's a strange one alright. I would expect the top transistors to be MJ15023 too.

If you opt to go for the MJ15023, you may encounter some stability problems. Best power up with a light bulb first and check with scope. BTW, some amps with opamp front end cannot be powered up with a variac.

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