At risk of sounding the shill, I'm bound to say you could just order an NTE-181Thanks, well I guess I'll keep looking.
A firm I worked for that made high power ultrasonic generators used a house coded transistor that was equivalent to the 3772.That's a Motorola in-house 'ID' --- While, ostensibly, there is no exact generic equivalent, please consider the following...
The closest generic cross = 2N3772
Note: Although many sources cite the 2N3773 as an acceptable cross, unless you are well versed with your application's parameters, I strongly advise against it - inasmuch as the 2n3773's Ic (Max) figure ~ 1/2 that of the M9639! --- You may rest assured that the 2N3772 will 'fit the bill' in nearly all cases...
There are two I posted a thread earlier about my 14v power supply was putting out 24VDC and determined that I had a bad pass transistor. I've been searching for a week and can't find one. I even started to wonder if maybe I had the wrong numbers, because there was nothing available.It might be that the original part is way overkill for the application, but was what was in the manufacturer's inventory.
Another approach is to tell us the requirements of the power supply and reverse-engineer the device selection. For example, a 14 VDC output linear power supply probably has less than 30 Vpeak into the pass transistor. If you take the rated output of the supply times 1.5 or 2.0, that should be a safe estimate of the current rating needed. The last thing is the gain, and I seriously doubt that it needs to be much above 20 at max current because the 2N3055 influenced generations of designers. BTW, is this the only pass device or are there more than one in parallel?
ak
LOL well eBay was my next move and unless i find something it might be my only hope.A further caveat:
Please! Please!! Please!!! beware of counterfeits!!! Buy only from reputable distributors (e.g. Mouser, Digikey, Newark and their ilk) *PLEASE* don't even think about Ebay! My "tuition", in this regard, was $20K+
Best regards
HP
Again, as stated in post #5 (q.v), you may buy the NTE-181 Directly from New Tone Electronics:LOL well eBay was my next move and unless i find something it might be my only hope.
Thank you I missed that some how. I was just getting overwhelmed over all the information and how it all fit together. Anyway I just placed my order ntepartsdirect.com, thanks again.Again, as stated in post #5 (q.v), you may buy the NTE-181 Directly from New Tone Electronics:
http://www.ntepartsdirect.com
Piece price = $9.77 (USD) / No minimum order --- You can't beat that!
Best regards
HP
Well I just didn't know of anybody else that had it although I wasn't looking for a NTE-181 at the time. Oh well it cost me $30 for two with shipping. Anyway I'm just glad its ordered.NTE can be handy, but they average 3x the original part price.
I only use in a dire emergency.
Max.
Bit like Maplin in the UK - similar price ratio.NTE can be handy, but they average 3x the original part price.
I only use in a dire emergency.
Max.