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Old 19th May 2006, 05:06 AM   #1
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Default ampzilla transistor replacement for 2N3584 and 2N6421

Hello
On my ampzilla II one channel has blown. Now i am looking for a
replacement for 2N3584 and 2N6421, also if it´s no TO66
Do you have any suggestions which transistors i can use wake up this amp again. Also i would like to buy a working PCB.
Thanks for your help
Wolfgang
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Old 19th May 2006, 10:42 AM   #2
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For the TO -66 mounted on the side? MJE15030 & 31

Your not going to find a used working PC board for one. If you do I also need to replace one gutted from fire on board. There are far better amps out there than what JB designed. Try Briston SP?
Better output stage and far less problems.

Outputs use "ON" 21194 and compliment.

USE NO ECG OR NTE PARTS AT ALL!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Old 20th May 2006, 09:28 AM   #3
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hello Burnedfinger
yes i am looking for the TO66 on the PCB like you can see on the picture. The GAS116/117 are already changed to MJE150028/29 in TO220
Did you already replace the 2N3584 and 2N6421 with the MJE15030/31 ?. Iam a little be worry because for 2N** the Uce =350V, for MJE Uce=150V and rail is +80V to -80V

Wolfgang
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Old 20th May 2006, 10:43 AM   #4
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I have done about 100 over the years without any problems. My own personal Ampzilla ran for years without problems. I finally was offered some serious money and I parted with it.

2N6412 specs

Pkg=TO66 / Vceo=250 / Ic=2 / Hfe=8-80 / fT(Hz)=10M / Pwr(W)=35
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Old 20th May 2006, 10:58 AM   #5
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Thanks
I am very much facilitated and i will do like you suggested
On SAE yahoo forum i didn´t get any reply
Wolfgang
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Old 20th May 2006, 11:08 AM   #6
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As long as you are not bridging them there will be no problems. The SAE forum will also tell you that no one is capable of rebuilding the SAE or Ampzilla except for JB of course and several other hand picked boys of JB's.

I get most of my spending money from rebuilding the SAE's and Ampzilla's that are sent to me from people off the SAE forum because I will fix them for a decent reasonable price.

Pay particular attention to the large resistors on the board because they can and will change value and this will cause you some heart ache.

Good luck. Take your time and you won't have a problem. Also change the bias pot because age will cause a problem here also.
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Old 21st May 2006, 02:01 AM   #7
djk is offline djk
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Digi-Key

MJE15032GOS-ND MJE15032G TRANS PWR NPN 8A 250V TO220AB ON Semiconductor NPN 250V 8A TO-220AB Bulk $1.43

MJE15033GOS-ND MJE15033G TRANS PWR PNP 8A 250V TO220AB ON Semiconductor PNP -250V -8A TO-220AB Bulk $1.43
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Old 21st May 2006, 11:18 AM   #8
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Looks like I was corrected and rightly so.

Sorry, memory isn't like it used to be.

DJK, Dennis has corrected my numbers.
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Old 21st May 2006, 01:55 PM   #9
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Hope i will find those trannies MJE15032/33 soon nearby
What would you suggest for 2SA839 and 2SC1669 ?
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Old 21st May 2006, 11:26 PM   #10
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"DJK, Dennis has corrected my numbers."

The MJE15030/31 are probably OK at ±80V, even though only rated at 150V.

The MJE15029/29/30/31/32/33 family are obtained on a selection basis. They start out the same, they make them, and then grade them. Ones that aren't good enough to be the 250V group become the 150V group, etc. This implies that the 120V group cannot do 150V, and the 150V group cannot do 250V, but may be a bit better than 150V (enough for ±80V)

The MJE15034/35 seem to be a bit different, probably not the same die group.

I don't have the data books anymore on the 2S numbered parts. If someone can give me the links to the data sheets, I may be able to recommend subs.
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