Minimoog and the tis97 transistor

[delayed]

What is a direct drop in replacement for the TIS97 transistor within a MiniMoog? Or is there a cheap place to buy them?

[chguigoz]

Hi. You can use 2N3904 as direct replacement.

[delayed]

Is there a reason the service manual only states one of the "tis" transistors to be a direct replacement with the 3904?

[chguigoz]

Which?

[Gaetano_AU]

The schematics state that:

2N3904 = TIS92
2N3906 = TIS93
BUT TIS97 = TIS97

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MiniMoog VCF Transistors.GIF
Description:	Here are the Pinouts of the transistors for reference in case you need to try a substitute.
Filesize:	7.43 KB
Viewed:	8287 Time(s)

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[TheAncientOne]

Interesting.

If you got them from Fairchild, you got A max collector current, (Ic) of 500mA, and a max VCE of 40V. If you got them from microElectronics they specify Ic max of 200mA, but VCE of 60V.

Otherwise it's a high gain general purpose NPN with a fairly low capacitance, (1 - 4 pF).

I would be tempted to try a BC 547, (since I'm in Europe), and select one with a gain higher than 300, YMMV.

[delayed]

To take a shot at my own question, it might simply be the pinout?

[Gaetano_AU]

From my datasheets I get VCE = 40v for both.