diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   Solid State (http://www.diyaudio.com/forums/solid-state/)
-   -   Toshiba 2SA1095/2SC2565 replacement (http://www.diyaudio.com/forums/solid-state/148484-toshiba-2sa1095-2sc2565-replacement.html)

PaleRider 3rd August 2009 10:05 AM

Toshiba 2SA1095/2SC2565 replacement
 
My old Electrocompaniet AW250DMB blew up:dead:

They warned me at EC the last time; they didn`t have any more of those old transistors left so the next time they blew up I`ll have to replace them all. (24)

Well, now it just happened, I saw the smoke from the left board on the right side amp. Picked it out to identify the transistors and see if I could find those old Toshibas somewhere, and it looks like I did. Activeparts claims to have them both.
But even if they have Toshiba written on them they don`t look like the ones in my amp, these are black while the existing(?) are green.

Anyone who know a bit about this? Any reason why I should not use these replacements?

homemodder 3rd August 2009 10:24 AM

They are most probably fakes or cheap chinese remakes, you would be much better off replacing with other more modern transistors even from different manufacturers.

First find the reason why they are blowing in the first place. If its because of power handling get transistors that can withstand higher currents.

Roar Malmin 3rd August 2009 10:37 AM

I would try 2SA1216 and 2SC2922. They have the same pinout and outline. They are a bit higher, so you may have to do some mechanical juggling.
I have done it a few times, so I know it is doable.

Regards
Roar

PaleRider 3rd August 2009 08:18 PM

Hi Roar!

Beside the 5mm height-difference, the SA1095 are as fast as 60mhz while the SA1216 are 40mhz. That`s only 2/3 of the speed, won`t the slower ones need moore feedback?

Roar Malmin 4th August 2009 07:22 AM

The 2SA1216 is spec`ed at a height of 6mm, the 2SA1095 at 5,3 which equals a height DIFFERENCE of max 1mm. Should not pose any problem.
When EC went from 2SA1095 to 2SA1302, they did not alter any compensation. You can can safely assume that no problems will arise from the transitorial diversion of 2SA1216 as compared to 2SA1095.

Regards
Roar

pjp 4th August 2009 09:58 AM

PaleRider, the mounting holes are spaced at 24.4mm for both transistors, so thats good.
The 2SA1216 is indeed 5mm taller, but from the mounting hole to the bottom of the package thats only 2.5mm more, so you might not have a problem.
The pins are identically spaced at 5.45mm.
Try it and see.

Roar Malmin 4th August 2009 10:49 AM

Maybe it would be a good point to clarify what is meant by taller. The Sanken package is 6,1mm thick, the Toshiba is 5,3mm max. What this implicates is that the Sanken should fit snugly UNDER the circuit board, but the pins will have to be bent slightly backwards. Not a big issue.

Regards
Roar

pjp 4th August 2009 02:12 PM

I was thinking in terms of when the two transistors are aligned at their mounting holes, will the pins be in the same place or different.

Olek 21st October 2009 10:11 PM

[QUOTE=PaleRider;1894965]My old Electrocompaniet AW250DMB blew up:dead:

Are you fix the problem? Stand before the same work om my AW250. What type of transistors your are use finally? Any comments.

PaleRider 17th November 2009 07:04 PM

[QUOTE=Olek;1956819]
Quote:

Originally Posted by PaleRider (Post 1894965)
My old Electrocompaniet AW250DMB blew up:dead:

Are you fix the problem? Stand before the same work om my AW250. What type of transistors your are use finally? Any comments.


I went for 2SA1216 and 2SC2922 but I still haven`t heard the result, just know they works


All times are GMT. The time now is 02:19 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio


Content Relevant URLs by vBSEO 3.3.2