KRELL 484081 and 484002 output transistors remplaces codes. HELP!!! - Page 3 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 25th May 2010, 11:05 AM   #21
K-amps is offline K-amps  United States
diyAudio Member
K-amps's Avatar
Join Date: Nov 2003
Location: Indiana
How much did they charge for it?
  Reply With Quote
Old 25th May 2010, 04:48 PM   #22
fepablo is offline fepablo  Argentina
diyAudio Member
Join Date: Aug 2007
Hi. $15 transistor, $2 thermal pad and $5 resistor.

Thanks Federico.
  Reply With Quote
Old 26th May 2010, 12:24 AM   #23
AVWERK is offline AVWERK  United States
diyAudio Member
AVWERK's Avatar
Join Date: Jan 2004
Location: So Calif.
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.

  Reply With Quote
Old 26th May 2010, 08:38 AM   #24
AndrewT is offline AndrewT  Scotland
diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
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.
regards Andrew T.
Sent from my desktop computer using a keyboard
  Reply With Quote
Old 9th February 2013, 06:45 AM   #25
diyAudio Member
Join Date: Feb 2013
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.
  Reply With Quote
Old 9th February 2013, 04:04 PM   #26
K-amps is offline K-amps  United States
diyAudio Member
K-amps's Avatar
Join Date: Nov 2003
Location: Indiana
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.
  Reply With Quote
Old 9th February 2013, 04:26 PM   #27
diyAudio Member
Join Date: Jul 2002
Location: ISRAEL
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.
  Reply With Quote
Old 11th February 2013, 09:16 PM   #28
diyAudio Member
Join Date: Feb 2013
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?
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Transistors for Krell, Spectral,....(VP0120N5 or VN0116N5) moirasc Swap Meet 9 18th January 2016 10:28 PM
output transistors pezza89 Vendor's Bazaar 0 2nd November 2007 10:14 PM
Transistors for Krell KSA-250? studiotech Solid State 0 4th December 2006 11:43 PM
Long output lead or long output transistors leads? which one to pick? chris ma Everything Else 3 6th June 2003 12:06 PM
Output Transistors weinstro Parts 1 9th May 2003 11:51 AM

New To Site? Need Help?

All times are GMT. The time now is 02:52 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2