Sanken ST-610 Power TO-3 Transistor Replacement for Luxman SQ-503 (SQ503) ??

[tiefbassuebertr]

I don't find any data sheets about the ST610 in TO-3 outline from Sanken. Also about
http://www.toragi.com/x/museum/B4EIAJ/B4EIAJ6.htm
this is listed. Is it a germanium or silicon type? Perhaps a darlington? Who knows more?

attached jpg files of this amp and transistor you will find at post #98 (page 10) about
Overview of Brands and Models from first Solid State Audio Amplifier Components want.

[tiefbassuebertr]

still nothing informations?

[ontoaba]

Datasheet:

ST610

Si NPN Power BJT
Sanken Electric

V(BR)CEO (V)=55
V(BR)CBO (V)=100
I(C) Abs.(A) Collector Current=6.0
Absolute Max. Power Diss. (W)=80
I(CBO) Max. (A)=.10m
h(FE) Min. Static Current Gain=10
h(FE) Max. Current gain.=80
@I(C) (A) (Test Condition)=1.5
@V(CE) (V) (Test Condition)=4.0
f(T) Min. (Hz) Transition Freq=25k
t(d) Max. (s) Delay time.=160n
t(r) Max. (s) Rise time=1300n
t(s) Max. (s) Storage time.=2.5u
t(f) Max. (s) Fall time.=2.6u
Status=Discontinued
Package=TO-3
Military=N

May be equal with smaller 2n3055 (smaller than 3055). Slow silicon with low gain. Looks good for switch (fast switch).

[tiefbassuebertr]

Thank you therefore. Do you know, where I get genuine datasheet from Sanken?
Perhaps you know a source, where is to find a cover picture of the appropriate genuine databook from Sanken (only in japanese available - I think). If I had this, I can rent about my interlibrary loan from the library in Wiesbaden. go to "vintage Transistors" (here on diyaudio) about
Vintage Transistors
for cover examples of very old databooks.

[ontoaba]

May be it is special or something, they don't follow JIS 2SC or 2SD in this case, but I see similar characteristics with 2SC1060 and 1061 used by sony. I am searcing new sanken's BJT replacemant but no result this far. The specification looks similar with switcing BJT. I ever using some old 2SA958 as Voltage amplifier with 100mA current mwny years ago, but almost all of them blow up after few years. Old sanken has bad heat reliability, but new sanken has massive improvement in this with thinning wafer process.

[WuYit]

tiefbassuebertr,
there is no genuine data sheet from SanKen. What do you want to know about this old switch transistor?

[ontoaba]

Hi, WuYit, Sometime we need a datasheet to repair amplifier with obsolete part for replacement as close as possible. And another time we need old datasheets for reference from old things and learned from our old or even burried grandfather in designing amplifiers. Learning from old is useful and faster than from the young.

[WuYit]

ontoaba,
the ST-610 appears to be a pretty ugly creature, almost anything would be nicer...

[tiefbassuebertr]

Originally Posted by WuYit

tiefbassuebertr,
there is no genuine data sheet from SanKen.

this cannot be true, because on the data list (pdf post #4) this type is listed. From all listed types on such lists there are genuine data sheets present (unfortunately the most of the vintage transistors not online)

Originally Posted by WuYit

tiefbassuebertr,
What do you want to know about this old switch transistor?

I have no specific question (any question I can ask first, when I see Sanken's datasheet).
For repair/replace I have no problems, because I can check the circuit virtuell by CAD software.
Nevertheless I want to have various genuine data sheets and data books from this time.
an off-topic question:
are you "stinius" ??
go to post #5 about
schematic variation and sim results of Pass "X" series US pat 5376899

[ontoaba]

Originally Posted by WuYit

ontoaba,
the ST-610 appears to be a pretty ugly creature, almost anything would be nicer...

Yes.. WuYit, it is old technology, when they could yet make wafer drawing. They only bump some metal into the wafer. From the datasheet, ST-610 is good for switch, but luxman using it for linear. Just like Sony 1055, with C1060. I ever try to replace it with some BJTs that I think better, but I am wrong.