KRELL 484081 and 484002 output transistors remplaces codes. HELP!!! - Page 3 - diyAudio
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Old 25th May 2010, 11:05 AM   #21
K-amps is offline K-amps  United States
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How much did they charge for it?
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Old 25th May 2010, 04:48 PM   #22
fepablo is offline fepablo  Argentina
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Hi. $15 transistor, $2 thermal pad and $5 resistor.

Thanks Federico.
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Old 26th May 2010, 12:24 AM   #23
AVWERK is offline AVWERK  United States
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Can you put a DVM on each ER resistor (black 5 W) and right down the mv for each one. I'm interested in the spread deviation. Tell us the new tranny and it's value compared to the rest of the exsisting string it's on.

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David
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Old 26th May 2010, 08:38 AM   #24
AndrewT is offline AndrewT  Scotland
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That measurement spread will be very dependent on the tolerance of the 5W resistors. if they are random 5% then your comparisons are not worth much.
If Krell have selected them for <1% then comparisons are more valid.
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Old 9th February 2013, 06:45 AM   #25
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Default Dear frends

I'M John from Modena, italy. I have a KSA200s.
2 month later sx channel were burned, with a nice smoke . Despair.
With a bit of good will (I'm a repairman) I removed everything and tried the final transistors.
2 Transistors model 484024 are destroyed (short circuit). I can't found it's on the market.

Which model I can use?

The model is not equal ksa 100s. Can I use MJ21193 and MJ21194 in TO-3 metal package?

Last edited by johnmup; 9th February 2013 at 06:54 AM.
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Old 9th February 2013, 04:04 PM   #26
K-amps is offline K-amps  United States
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The Krell parts are 30Mhz or similar fast variety. they were custom parts that ON/MOT made for them, not off the shelf 15024/25 rebranded. They are closer to the 1302 types in speed.

Having said that.... These seem to be different ones than the ones on the 100S model. These end with 025/024... safe to say they are 250w parts. However the fT of the 21193/4 is only 4Mhz.... Safer choice is MJL4281a types which I am sure will sound better... and they are ft 35Mhz... BUT they are not TO-3 package.... The only MOT replacements in TO-3 are slow and have lower DC gain than the 1302 types... These would definitely affect sonics.... I'd either replace the entire OP stage with the MJL4281a' types OR order a replacement from Krell.... I would not put the 15025/211xx types in that nice Krell.
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Old 9th February 2013, 04:26 PM   #27
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The best and the cheapest way for you is to get all the needed parts from one sorce and that is Krell service Dpt.

Good TO-3 transisors are also made by:
Complementary Bipolar Power Transistors for High Power Audio

but you`ll have to replace all output devices at once,and that`s costly... But these are an alternative to the motorola parts.
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Old 11th February 2013, 09:16 PM   #28
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Default Original schema

The original schema indicate mj15024 and 15025 transistors.

For non TO-3 package is impossible to install the transistors ...

For the MG6332/3 & MG9412/13 indicated by BenY, I ask:

The gain of transistor? The curve? Difference by original? There are 8 parallel transistor in positive signal and 8 in negative, coupled by 1 ohm resistance on emitter. I mustm to replace entire bank? 16 + 16 transistors? Is a big risk ...

I Ask to krell if there have transistors to replace?
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