Krell power transistors

[rss388]

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!

 

[Tekko]

I think they are MJ15003 and MJ15004 or similar.

 

[rss388]

I think they are MJ15003 and MJ15004 or similar.

Thanks.

I thought these were more in the 3281/1302 family? I had some very vague memory reading that the Krell transistors are actually 4281/4302 but I could not find the source any more.

 

[Zero Cool]

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??

 

[rss388]

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.

 

[Jeffckh]

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!

 

[JennySig]

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

 

[neychi]

MJ15003G - ON SEMICONDUCTOR - TRANSISTOR, NPN, -140V, TO-3 | Farnell element14

MJ15004G - ON SEMICONDUCTOR - TRANSISTOR, PNP, -140V, -20A, TO-3 | Farnell element14

 

[vopassathavorn]

[image]Image:KRELL KMA100 Driver board|none[/image]

Anyone know replacements for these 2 driver transistors?
Krell 317B and Krell 417B.

The board is from Krell KMA100 MKI

 

[vopassathavorn]

Anyone here know what are the replacements to Krell 317B and 417B transistors?

 

[BenY]

Anyone here know what are the replacements to Krell 317B and 417B transistors?

Show us the transistor and where it sits in the circuit.

 

[vopassathavorn]

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

 

[Groove T]

Those are the usual Krell Drivers 15030/31

 

[vopassathavorn]

Those are the usual Krell Drivers 15030/31

Thank you so much! Good to know I can still easily get them.
Any idea which is which?

 

[ticknpop]

I will have the driver boards, power supply, and output devices from a pair of KMA 100 available for sale soon.

 

[vopassathavorn]

I will have the driver boards, power supply, and output devices from a pair of KMA 100 available for sale soon.

Let me know. I'm interested.

 

[ticknpop]

The power supply is the regulated power supply pc board for the driver board.
includes all the output devices too