Searching for µPA68H

[Darkness, Darkness]

Hello,

Does someone know where I could fine a µPA68H component (or any equivalent ?). It seems to besome kind of FET op amp used in vintage audio amps.

Thanks !

[R.G.]

Nope, sorry.

But it's likely that it can be replaced with a modern one if you can dope out the pinout.

[theehman]

Looks like a dual NPN JFET.  Here's a data sheet: http://www.datasheets.org.uk/pdf/3988875.pdf

[Darkness, Darkness]

Thanks guys ! Now it remains to find a suitable equivalent. Any suggestion ?

[R.G.]

Dual JFETs are a beast of a different color. There are - or were - a few Japanese part numbers. Most have been discontinued.

Best chance is to either do a google search for "dual JFET" or to try matching some non-duals. Matching for Vgs and Idss, then checking transconductance for similar should produce OK results, especially if you superglue them together face to face for thermal linking.

[JDoyle]

You are almost certainly going to have to substitute two discrete and matched JFETs. I'd go with the 2SK170GR series to split the middle between exact performace and real-life availability.

Good luck!

Jay Doyle

[Darkness, Darkness]

Thanks !!! It helps a lot ! 


The 2SK170GR seems quiet easily to find. Also when looking for information on the  2SK170GR I found references to LSK170A and its dual version LSK389. Maybe some good candidates from Linear Systems... I don't know if these ones are easily available
http://www.linearsystems.com/datasheets/LSK389.pdf

2N3954A, 2N3954, 2N3955, 2N3956, 2N3958
Low Noise, Low Drift, Monolithic Dual, N-Channel JFET
2N5905, 2N5906, 2N5907, 2N5908, 2N5909
Low Leakage, Low Drift, Monolithic Dual, N-Channel JFET
2N5911, 2N5912, 2N5912C
Wideband, High Gain, Monolithic Dual, N- Channel JFET
LS830, LS831, LS832, LS833
Ultra Low Leakage, Low Capacitance, High Impedance, Monolithic Dual, N-Channel JFET
LS840, LS841, LS842
Low Noise, Low Drift, Monolithic Dual, N-Channel JFET
LS843, LS844, LS845
Ultra Low Noise, Low Drift, Monolithic Dual, N-Channel JFET
LSK389
1nV/hz Low Noise, Monolithic Dual, N-Channel JFET
SST/U401, 402, 403, 404, 405, 406
Low Noise, Low Drift, Monolithic Dual, N-Channel JFET
SST/U421, 422, 423, 424, 425, 426
Low Leakage, Low Drift, Monolithic Dual, N-Channel JFET
SST/U440, 441
Wideband, High Gain, Monolithic Dual, N- Channel