Krell power transistors

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Howdy folks,

I recently got a hold of a number of Krell power transistors 484002 and 484081. Does anyone have the definitive specs on them? Are they the TO 3 versions of 2SC3281/2SA1302 or early versions on the ON MJW/NJL/NJW versions? Or are they of 4281/4302 types, which are higher voltage and more rugged?

TIA!
 
as far as i know the 3281/4281 type series is a TO-247 case which the non D'agostino krell may have used but all the big ol Dan-o Krell's used metal can TO-3 types and i thought were the MJ150024/25 types??

Couple of things:

1. I have in my possession a bunch of Krell transistors labelled 484025 and I have seen 484024 as well. I believe those are the MJ15024 and MJ15025.

2. I read somewhere that Krell had commissioned ON (or Mot at that time) to make a TO3 power transistor pair based on the 3281/1302 and labelled them 484081 and 484002. What is not clear to me is what the actual specs are, even ON 3281/1302 have a number of variants in breakdown voltages and whether they could actually be the 4281/4302 type.
 
Hi, I recently faced problem with my Krell 250A with one channel failing. Two of the rail fuses inside were blown. I checked and found several power transistors on the output stage were shorted. I purchased the MJ 15024/25 pair from RS components and replaced all the 7 pairs of transistors. It is now working fine!
 
Krell KSA 50

Hi
I am wondering if anyone can help me, I have a Krell KSA 50 and a need to buy power transistors MJ15003 and MJ15004, does anyone have any idea where I can purchase these online?
I also need Krell 317b and Krell 417b and a nod 3439 and Mds

all help appreciated

best
Jenny
 
Krell KMA100 driver board

[image]Image:krell driver board|none|They are the top ones attached to big blue heat sink[/image]
Show us the transistor and where it sits in the circuit.


They are the top ones attached to big blue heat sink
 

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