Help needed for Sanken transistors LAPT-3

[eradoncic]

Help needed for Sanken transistors, LAPT-3


Does anybody know what kind of replacements (or source) are suited for Sanken audio output transistors marked as LAPT-3?

On the Sanken web site I found only as info that these are custom made for Sansui, now discontinued, and nothing more! No suggested replacement, no equivalents... nothing at all! Even no e-mail contact addresse for asking them...
I sent an e-mail to AlegroMicrosystems (distributers of Sanken), but there's no any answer from them.

Here are the collected infromaton I found:

Sanken catalogue lists several transistors to belong to LAPT group, and I can recognize 2SC3519/2SA1386, 2SC3284/2SA1303, 2SC3264/2SA1295 which are incorporated in various Sansui amplifiers like: AU-X901, AU-X701, and AU-X911DG, respectively.

From the 1990's to the end of the company, they were used transistorsmarked as LAPT-2, LAPT-3 and LAPT 23 (these can be recognized as 200W devices, probably 2SC3264/2SA1295, but I dont know to what equivalents belong LAPT-3)

LAPT-3 looks lake standard TO-3P trannies, but collector base looks copper-alike (I guess it is a non-magnetic/antivibrating issue)

Thank you in advance


__________________
eddie

[K-amps]

Picture please?

What is the trannie emitter connected to , B+/B- or to the load?

[eradoncic]

Unfortunatelly, I have no any pics, the trannies are usual TO-3P type, and I did not find neither service manual, but I have for AU-X901, 701 and 911.

The driver transistors are 2SC3298/2SA1306.
On the emiter there two parallel 0,47 Ohm resistors

On the previous generations of cited amplifier, namely AU-X901 and AU-X701 the drivers are identical.

However, the outputs are different: AU-X901 (3x13oW/8Ohms) uses 2SC3519/2SA1386 and on the smaller AU-X701 (2x100W/8Ohms) are incorporated 2SC3284/2SA1303

Au-alpha707 is 2x130W, and to some extent is more similar to AU-X901, but the construction and PCB's are of the AU 911DG.

[K-amps]

I am confused the 2sa1302/3 are TO-3PL and the 2sa1295 is an MT-200.

Which one do you need?

[eradoncic]

Sorry for confusing...
To clarify:

There's exist three type of these transistors: LAPT-2, LAPT-3, and LAPT-23, all made by Sanken, custom produced for Sansui.

In my amplifier are LAPT-3

I need the equivalent or replacment for LAPT-3, but I don't know the specs, because they are discontinued...
And no information on Sanken web other than they are dicontinued.

[K-amps]

Any of the newer toshiba's should work....