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changsecho 20th July 2007 03:04 PM

Adcom 555
could anyone help me here i;m replaceing the 2sd525 and the 2sb595 but the problem is there is a thermistor attached to them number td5-c210 could anyone tell me how to take them off the transistor and what do i use to replace the thermistor it;s 1k ohm i don;t know if they are attached with some kind of glue or what it sits on top of the transistors these are driver transistors i want to replace them with the mfe15030/31 the other problem with this is the ones i;m replaceing have only 2 leads coming out the new one has 3 the emmiter base and the collector can anyone help me with that i sure could use it i;m not a pro at this i need all the help i can get

Bigred 20th July 2007 06:31 PM

Only 2 leads from the 2sd525 and the 2sb595 ?:cannotbe: I'm pretty sure the thermistor is connector to the emitter and base so where the heck is the collector pin? As far as how the thermistor is attached I'm not positive, prolly hard glue coating over top. Maybe use a small jewel screw driver to carefully try and pry or exacto blade and carefully scrape.

djk 20th July 2007 09:29 PM

The metal tab on the TO-220 case is the collector.

Those 2SB/SD numbers were selected, you cannot use off-the-shelf parts. MJE15030/31 will work, 32/33 are better, don't use 34/35.

anatech 21st July 2007 06:32 PM

Hi changsecho,
Like djk said, those are selected parts for high voltage. You can not use normal parts with the same number. His replacement suggestions work very well.

The thermistor can be removed with a razor blade. It needs to be reattached to the new part.

Hey Bigred!,

prolly hard glue coating over top.
Dude, did you ever take an English class? prolly means probably, is this correct? prolly sounds like a small fish or something.


Bigred 21st July 2007 09:27 PM

hey anatech... yes I am "edgumacated" and can spell. I sometimes have a bad habit of using short form for typing purposes. I fig that most peeps would understand prolly means probably. fig=figured and peeps=people. I will try not to post in short form anymore and run my posts thru.. err through a spell checker. :clown:

djk 22nd July 2007 01:32 AM

I had the spelling corrected in the title so future searches on Adcom would show this thread.

Bigred 22nd July 2007 02:05 AM

I guess that 1 slipped by anatech :D

djk 22nd July 2007 03:43 AM

He may not have seen the post before I had it corrected.

anatech 22nd July 2007 03:50 AM

Hi Bigred,
Yes, I checked it and it was already corrected.

My earlier comment was merely in the spirit of the many people who do not speak English as a first tongue. For respect of our members who may have to work more to read the forum language, we should try to be clear when we post. This goes for everyone.

Hi djk,

I had the spelling corrected in the title so future searches on Adcom would show this thread.
Thank you for that. We moderators are simply here to help. ;)


Bigred 22nd July 2007 03:52 AM

thx for clearing that up anatech... I kind of took it as an insult. see there I go again. I mean thanks

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