Transistor Help - Please

[weasel440]

I'm working on a philips 32PFL3504D/F7 and I found some bad transistors. I was wondering if anyone has a way to cross these over to another brand or maybe a site that would carry all 3 that I need. I really don't want to order from several places due to high shipping costs for penny parts. Or if someone on here that might want to sell me some?

Part #'s i'm looking for are....
KTA1267, KTC3198 & 2SA950. These numbers are taken from the service manual for this tv. I've also added pictures of the data sheet for each I need.

[Th3_uN1Qu3]

Re: Transistor Help - Please

For the KTA/KTC you can use the common 2N3904/2N3906 which you can get for super cheap even at Radio Shack. For the 2SA950 i'll have to take a better look, i would have said 2N2907 but that has a higher saturation voltage and will heat up more. If there's room you can buy 2907s anyway and use two in parallel.

[weasel440]

Re: Transistor Help - Please

I have another question on a different transistor? I can't seem to locate a spec sheet. transistor is a 2SD400(E).

is this a good testing method? Test each pair of leads both ways (six tests in total):

The base-emitter (BE) junction should behave like a diode and conduct one way only.
The base-collector (BC) junction should behave like a diode and conduct one way only.
The collector-emitter (CE) should not conduct either way.

Taken from this site... http://www.kpsec.freeuk.com/components/tran.htm

[jetadm123]

Re: Transistor Help - Please

2SD400 spec sheet

[Radio Fox]

Re: Transistor Help - Please

...is this a good testing method? Test each pair of leads both ways (six tests in total):

The base-emitter (BE) junction should behave like a diode and conduct one way only.
The base-collector (BC) junction should behave like a diode and conduct one way only.
The collector-emitter (CE) should not conduct either way.

Taken from this site... http://www.kpsec.freeuk.com/components/tran.htm

Yes, but the readings differ depending on whether you are using a digital meter or an analogue meter.

If you are testing an NPN transistor with a digital meter using the diode test setting, then it will measure the voltage drop with the red lead on the base. If you use an analogue meter set to a low Ohms range, then it will read with the black lead on the base.

[weasel440]

Re: Transistor Help - Please

ty for the help so far. I'm using a DMM (craftsman) need to eventually get something better. Is there any markings on the transistors to tell what style case it has? If you click on the link and scroll down to "connecting" you'll see what my question is about. I'm refering to style (TO92A, TO92B, TO92C) http://www.kpsec.freeuk.com/components/tran.htm#table

[Radio Fox]

Re: Transistor Help - Please

ty for the help so far. I'm using a DMM (craftsman) need to eventually get something better. Is there any markings on the transistors to tell what style case it has? If you click on the link and scroll down to "connecting" you'll see what my question is about. I'm refering to style (TO92A, TO92B, TO92C) http://www.kpsec.freeuk.com/components/tran.htm#table

You will very rarely find markings on the transistor itself to show which leads are which. Search for the transistor, & download the data sheets as you did in your first post.