Hi
Have one of these which I have blown transistors on. I have checked all the transistors and found the following.
Right Channel total of
4 x Motorola PNP 8126
1 x Motorola NPN 8126
3 x Motorola PNP 8113
7 x Motorola NPN 8113
1 x CLASSA6 8052
Left Channel total of
1 x Motorola PNP 8126
1 x Motorola NPN 8126
6 x Motorola PNP 8113
7 x Motorola NPN 8113
1 x CLASSA6 8052
Now for the silly questions 😕😕😕(Jeopardy)😀😀😀
I have scoured the Earth looking for data on the 8126 and 8113 and the 8052 but cannot find any
Are the 8126, 8113 and the 8052 all theoretically equivalent?
Are all of the above replaceable with 2N5878 and 2N5876?
Please help
Have one of these which I have blown transistors on. I have checked all the transistors and found the following.
Right Channel total of
4 x Motorola PNP 8126
1 x Motorola NPN 8126
3 x Motorola PNP 8113
7 x Motorola NPN 8113
1 x CLASSA6 8052
Left Channel total of
1 x Motorola PNP 8126
1 x Motorola NPN 8126
6 x Motorola PNP 8113
7 x Motorola NPN 8113
1 x CLASSA6 8052
Now for the silly questions 😕😕😕(Jeopardy)😀😀😀
I have scoured the Earth looking for data on the 8126 and 8113 and the 8052 but cannot find any
Are the 8126, 8113 and the 8052 all theoretically equivalent?
Are all of the above replaceable with 2N5878 and 2N5876?
Please help
The originals were 2N5878 and 2N5876, chosen because back then they
were relatively fast (4 MHz).
Today you can buy OnSemi TO-3's MJ15022 through MJ15025 from Digikey,
much more robust with the same speed.
In stock, about $5.
😎
were relatively fast (4 MHz).
Today you can buy OnSemi TO-3's MJ15022 through MJ15025 from Digikey,
much more robust with the same speed.
In stock, about $5.
😎
Much obliged
Not everyday I get to respond to someone who has worldwide influence.
Old hat for you but honour for the mere mortals
Not everyday I get to respond to someone who has worldwide influence.
Old hat for you but honour for the mere mortals
Questions from the far side
So if I may surmise
The 2n5876 and 2n5878 Vitals (Doctor speak) are 80v for both base and emmittor voltage and 10A collector current And ft 4mhz.
So if the above mentioned MJ15022 to MJ 15025 would be replacement.
Then the voltage is 250v to 400v on base and emmittor and the current is 16A and the freq 4 MHz. So if all measurements are above the "originals" will be fine?
So if I may surmise
The 2n5876 and 2n5878 Vitals (Doctor speak) are 80v for both base and emmittor voltage and 10A collector current And ft 4mhz.
So if the above mentioned MJ15022 to MJ 15025 would be replacement.
Then the voltage is 250v to 400v on base and emmittor and the current is 16A and the freq 4 MHz. So if all measurements are above the "originals" will be fine?
Greater voltage, current and dissipation are always a plus, all else being equal.
When the MJ15022-25 came out, we dropped the 2N5878 and 76.
Actually, it almost did us in, as Motorola was very late on initial delivery.
😎
When the MJ15022-25 came out, we dropped the 2N5878 and 76.
Actually, it almost did us in, as Motorola was very late on initial delivery.
😎
The Next Round
Does this include the Motorola CLASSA6 8052 ?
Replaced by above mentioned series ?
From the above breakdown of transistors on the rail is it a PNP transistor ?
Does this include the Motorola CLASSA6 8052 ?
Replaced by above mentioned series ?
From the above breakdown of transistors on the rail is it a PNP transistor ?
What you think are different part numbers. 8126, 8113, etc are just date codes of when the transistors were manufacturred. the class A device may have been been selected gain device or new manufacturer part # with 1982 date code
Thank you for that much needed info.
Running out of silly questions for now
Would it be ok to change all the transistors on one side and not the other?
Would there be a significant difference in sound ?
Running out of silly questions for now
Would it be ok to change all the transistors on one side and not the other?
Would there be a significant difference in sound ?
Hi, I was looking at a Stasis 3 for sale locally but when I examined the transistors (The visible ones), it was apparent 2 had been changed in one channel.
The seller was asking an E-bay price, so I defered.
After looking up the availability of the transistors in this thread, I'm thnking I may go ahead.
I have a couple questions though...
First, does anyone know how closely I should match these output devices?
Second, It looks like the MJ21193G / 94G combo gives higher gain is there any reason not to use them?
The thread's a little stale, but maybe there's still some activity.
Thanks!
The seller was asking an E-bay price, so I defered.
After looking up the availability of the transistors in this thread, I'm thnking I may go ahead.
I have a couple questions though...
First, does anyone know how closely I should match these output devices?
Second, It looks like the MJ21193G / 94G combo gives higher gain is there any reason not to use them?
The thread's a little stale, but maybe there's still some activity.
Thanks!
We did not match outputs, we only confirmed that they were not gain
deficient. The originals are 4 Mhz devices, and I would be comfortable
using the MJ15022-25 series parts as replacements.
😎
deficient. The originals are 4 Mhz devices, and I would be comfortable
using the MJ15022-25 series parts as replacements.
😎
Oh, Thank you, Mr. Pass.
In the on-line world of our times, you're attention to these pedestrian inquiries has always amazed me.
25 or 30 years ago, I had a 400A which had failed in one channel, I called Threshold and asked about having it repaired and, only towards the end of the conversation when you gave your name, did I discover I'd been talking directly with the owner of Threshold.
It struck me as being uncommonly humble as you'd explained the options I had of upgrading to Stasis, etc.
Towards the end of the conversation, you seemed to emphasize that the 400A was a good amp and I should only upgrade to the Stasis topology if I had an interest in Stasis topology.
Lacking the funds at that time in my life, I didn't.
I still have that 400A, and now that I'm older a rediscovered fascination with
Audio & electronics repair.
Thanks again!
Mark
In the on-line world of our times, you're attention to these pedestrian inquiries has always amazed me.
25 or 30 years ago, I had a 400A which had failed in one channel, I called Threshold and asked about having it repaired and, only towards the end of the conversation when you gave your name, did I discover I'd been talking directly with the owner of Threshold.
It struck me as being uncommonly humble as you'd explained the options I had of upgrading to Stasis, etc.
Towards the end of the conversation, you seemed to emphasize that the 400A was a good amp and I should only upgrade to the Stasis topology if I had an interest in Stasis topology.
Lacking the funds at that time in my life, I didn't.
I still have that 400A, and now that I'm older a rediscovered fascination with
Audio & electronics repair.
Thanks again!
Mark
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