AU113 specs and replacement

[Remove _ for valid addres]

I lent my old Decca 12" BW TV to a friend, to use as a monitor with
a security camera. Within a day the EHT stick rectifier failed (which I
can replace with a modern EHT diode). However the line output transistor
is an AU113 which is hard to get these days.

Some web searching suggests ICmax=10A Vcbo=125V Vsat=0.8V@5A, however
no proper datasheet. Do you have one in an old databook to scan?
I believe it dates from around 1975. I'd particularly like to know the
Hfe (@5A) and the safe-operating-area Vc/Ic curve, to help find a more
modern replacement. Also the leakage figures; I suspect it's damaged, but
germanium transistors tended to leak like sieves anyway so it could
be normal...

(I've bodged in a 2SC5048 that I had lying around, not elegant as it
doesn't fit, is NPN while the original was PNP meaning some rewiring,
and of course is Silicon not Germanium so Vbe is much higher. This
struggles along well enough to prove the rest is working, but its Vsat=4V
is way too high, particularly as the power rail is only 10.8V.)

Thanks,
Mike.

 

[Watson A.Name - \"Watt Su]

"Remove _ for valid address" <u_1061771155@csi.com> wrote in message
news:slrnd0t94u.en.u_1061771155@csi.com...

I lent my old Decca 12" BW TV to a friend, to use as a monitor with
a security camera. Within a day the EHT stick rectifier failed (which
I
can replace with a modern EHT diode). However the line output
transistor
is an AU113 which is hard to get these days.

My ol' (paper) NTE catalog shows the NTE127 is sub for the AU113, and is
in the TO-3 case. It's available at Mouser, and probably your local
electronics store. Price? Well Mouser says $35.40, which is kind of
steep, but it saves you a lotta work.

[snip]

Thanks,
Mike.

 

[Franc Zabkar]

On 13 Feb 2005 00:51:42 GMT, u_1061771155@csi.com (Remove _ for valid
address) put finger to keyboard and composed:

I lent my old Decca 12" BW TV to a friend, to use as a monitor with
a security camera. Within a day the EHT stick rectifier failed (which I
can replace with a modern EHT diode). However the line output transistor
is an AU113 which is hard to get these days.

Some web searching suggests ICmax=10A Vcbo=125V Vsat=0.8V@5A, however
no proper datasheet. Do you have one in an old databook to scan?
I believe it dates from around 1975. I'd particularly like to know the
Hfe (@5A) and the safe-operating-area Vc/Ic curve, to help find a more
modern replacement. Also the leakage figures; I suspect it's damaged, but
germanium transistors tended to leak like sieves anyway so it could
be normal...

(I've bodged in a 2SC5048 that I had lying around, not elegant as it
doesn't fit, is NPN while the original was PNP meaning some rewiring,
and of course is Silicon not Germanium so Vbe is much higher. This
struggles along well enough to prove the rest is working, but its Vsat=4V
is way too high, particularly as the power rail is only 10.8V.)

Thanks,
Mike.

FWIW, the 2N5324 (Ge-PNP, 250V, 10A, 56W) and 2N5325 (Ge-PNP, 325V,
10A, 56W) are claimed to be equivalents.


- Franc Zabkar
--
Please remove one 's' from my address when replying by email.