replacement transistors for M67580?

[MAURO]

hi

this is a new thread on a subject we are all familiar with, i tried searching the site for the transistor part with no luck. this was also entered as a reply to someone else

http://www.probetalk.com/forums/show...did=1700964200

but since the topic is little different i started a new thread.

mike palmer's website just explains how to replace an ignitor module, but not any repair.

julian's site, accessable in mike site, describes how to build a new circuit, to replace the entire ignitor.

i was going to go this route, but finding the transistors, bux48a and buv48a is next to impossible, one is pretty much gone from the market and i have suppliers tell me anything from 6 weeks to 2 months lead time on orders of 300 units....

there are lots of replacements out there...i have a couple but i am holding off on building the circuit and then cutting into my ignitor module assembly....

i also tried to find the m67580 (761004) transistor from mitsubishi. without any luck. i cant even find documentation on the web (including mitsu's website) to determine the characteristics of the transistor to look for another replacement (ie MAYBE the bux or buv's and their replacements will work, but i dont know).

napa doesnt even carry the distributor mentioned in mike's website in canada.

if anyone has any info on the transistor please contact me directly, this would be a total joke to replace, the transistors i found for the external circuit are only $10 cdn. imagine.....

mauro

[Stingray77]

I was thinking off using a 3055 transistor

[MAURO]

hi

a 3055 from what manufacturer? its pretty hard to get anything from mitsubishi, perhaps they have exclusive licenses on some transistors.

you say you are thinking of trying...how did you make the selection of a 3055?

btw what is the damage from in your trailer, respond off the thread for that one...

mauro

[kfud]

It's a common type of transistor available at your local radio shack.

I believe leska mentioned this in the private message conversation you two had.

It is a TIP 3055 NPN transisitor. $2.50 CDN.

You cannot replace the one in the ignitor module since it is machine spot welded in place.

You have two options:

- New distributor
- External box and coil using the 3055 transisitor.

[Oylman]

3055 is a good choice - it's cheap, high current and it's available. I'm not sure if it will make the grade temperature wise. Worth a shot anyway.

[kfud]

I does not matter since it will be mount away from the engine.

[MAURO]

hi

leska hadn't mentioned it, but thank you

i dont think the spot welding will be a problem, that is just the connections to the rest of the circuitry...high temperature solder should do the trick? ie a higher ratio of tin to lead? in the end i may be able to spot weld it if i have to. any reason why solder would not work though?

regarding the power handling of the 3055, i will check on that as the originating thread for this (see below) came back with a point that made me question whether it could be a direct replacement.

replacements for me are 569 + 15 % from mazda for a whole distributor or 505 + 15% from ford for the ignitor.

since i already have the upgrade, i know the replacements are going to go again, hence the search for a replacement transistor.

i have asked for details on installing the msd, go to the other thread in my original email to see the response from MSD when i called them!

mauro

[Stingray77]

Originally posted by MAURO
hi

leska hadn't mentioned it, but thank you

i dont think the spot welding will be a problem, that is just the connections to the rest of the circuitry...high temperature solder should do the trick? ie a higher ratio of tin to lead? in the end i may be able to spot weld it if i have to. any reason why solder would not work though?

I always use silver solder. If you have the original igniter i don't know how you can get to it. If you have a remanufactured one that has gone bad, it looks like you can unscrew it and cut the prongs to take it out.

[MAURO]

hi

yes i have the replacement ignitor which is just screwed in, the leads can be simply cut.

what grade of silver solder would you use? and the exact flux?
i've only ever done silver solder in a machine shop on large pieces with an acetylene torch...never on something this small

what kind of power would your electric welder need?

mauro

[Stingray77]

Originally posted by MAURO
hi

yes i have the replacement ignitor which is just screwed in, the leads can be simply cut.

what grade of silver solder would you use? and the exact flux?
i've only ever done silver solder in a machine shop on large pieces with an acetylene torch...never on something this small

what kind of power would your electric welder need?

I found the silver solder at radio shack, it does not have a gade on it, but does contain lead (i didn't notice this untill now) The flux i use is Kester tinning flux with aquabond which is for lead free solder. I use a weller 140/100 watt soldering gun, i ground the tip down to a point. Normal irons take too long.

I don't think anyonw has done this transistor swap so i don't now if it will work.

[gettingaprobe]

you'd just need a transistor that will do the job. It has to exceed the safe operating area required by the disty. It has to be able to handle the currents and voltage. There's lots of transistors out there. zillions of em

[Stingray77]

I think leska siad in the other thread that he had tried this and it didn't work... the ZE setup also uses a condenser between the coil and igniter.

[MAURO]

yes leska said he tried the 3055, which is not all that high powered. what i would like to do is just replace the existing m67580 and keep the rest of the circuitry that is already in place...

i am assuming that the design on julian's website is made so that it will also provide the needed protection on the reverse spikes

now that i know that an igbt is needed, not just an npn, (unless these are the same thing, i will try and go back to the motorola site and see what i come up with...

mauro

[alejandro_gsxr]

Mauro you change that transisotr ?

[SuperSquid]

nuttin like a little necro....