This may be all there is.
TI makes some.
https://www.ti.com/power-management...s/products.html#1143=Dual;Dual Common Source&
TI makes some.
https://www.ti.com/power-management...s/products.html#1143=Dual;Dual Common Source&
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Toshiba aurex sc-m15.
Its working but on low volume one channel cuts out until you turn it a but up and then again works, cuts again on low volume.
Haven't gotten to take a look in it but looked in the service manual searched for the j fets for curiosity.
Its working but on low volume one channel cuts out until you turn it a but up and then again works, cuts again on low volume.
Haven't gotten to take a look in it but looked in the service manual searched for the j fets for curiosity.
Attachments
More likely a corroded connection or solder joint. Suspect all switches, connectors, etc.
A bad semi wouldn't do that. Signal trace with a scope, but it's probably after the volume control.
A bad semi wouldn't do that. Signal trace with a scope, but it's probably after the volume control.
And to finish the specs discussion for these dual FET I will add grades values,
measured in Japan (and which are missing in the d/s):
K1=1.5mA...3mA, K2=2.5m...4m
L1=3.5m...6m, L2=5.5m...8m,
M1=7.5m...11m, M2=10.5m...14m
N=13.5m...20m
Manufacturers usually overlap grades to play it safe.
For illustration - sample measurements for L2 and M1 (sub)grades:
measured in Japan (and which are missing in the d/s):
K1=1.5mA...3mA, K2=2.5m...4m
L1=3.5m...6m, L2=5.5m...8m,
M1=7.5m...11m, M2=10.5m...14m
N=13.5m...20m
Manufacturers usually overlap grades to play it safe.
For illustration - sample measurements for L2 and M1 (sub)grades:
Attachments
The TI devices look like N-Chan MOSFETS and not JFETs. I might be wrong of course - apologies if I am.
The TI devices are best suited to switching applications whereas the JFET device would typically be used as a diff amp in the front end of an amplifier stage.
The TI devices are best suited to switching applications whereas the JFET device would typically be used as a diff amp in the front end of an amplifier stage.