Hi, i need to find 2 good original toshiba 2n3773 to replace in a BGW amp.
I bough two from ebay and did try to charecterize them on my tektronix curve tracer, without surprise they dont match at all my good old ones...most probably chinese knock offs.
My old good ones are all hfe matched around 30, reverse leakage is all around 160-180v. I know there are several other test to characterize them.
The motorola act weird on the tracer but where actually used in this amp for years, but prefer to replace them.
so what are known good sources for theses ?
are the ones from mouser/digikey (On semi) a reliable source ?
thanks !
I bough two from ebay and did try to charecterize them on my tektronix curve tracer, without surprise they dont match at all my good old ones...most probably chinese knock offs.
My old good ones are all hfe matched around 30, reverse leakage is all around 160-180v. I know there are several other test to characterize them.
The motorola act weird on the tracer but where actually used in this amp for years, but prefer to replace them.
so what are known good sources for theses ?
are the ones from mouser/digikey (On semi) a reliable source ?
thanks !
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Mouser is a trusted supplier. Did you know, the minimum DC current gain is only 5!
As a matter of interest, we always used Motorola power transistor because they were filled with thermal paste and could take that little bit more abuse before shorting.
On Semi part number is 2N3773G
As a matter of interest, we always used Motorola power transistor because they were filled with thermal paste and could take that little bit more abuse before shorting.
On Semi part number is 2N3773G
All real Toshiba TO-3’s have that heat slug insert that the ones on the left have (marked 32 and 33). Any “Toshiba” To-3’s that don’t are fake. You won’t find Toshiba “2N3773’s” (aka 2SD873) new anywhere. I have found a handful of surplus over the years. They are good transistors, but don’t expect to find them when you’re actually looking for them.
The older Motorola’s often act weird testing Hfe at low currents. Many of the old epi-base types do. Newer ON versions are better behaved, but measure more like an MJ15003.
The BGW amps used to use selected devices, since they were running the 3773 above its 140 volt VCEO rating. It is safer and easier to just use MJ15024’s, because you don’t need to bother screening them, except a vbe or beta match if you choose to. And you’re more like to be able to match them than you will the 3773’s.
The older Motorola’s often act weird testing Hfe at low currents. Many of the old epi-base types do. Newer ON versions are better behaved, but measure more like an MJ15003.
The BGW amps used to use selected devices, since they were running the 3773 above its 140 volt VCEO rating. It is safer and easier to just use MJ15024’s, because you don’t need to bother screening them, except a vbe or beta match if you choose to. And you’re more like to be able to match them than you will the 3773’s.