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I originally used FJN3303 transistors, which have internal 22k+22k resistors. When Mouser stopped stocking the thru-hole versions, I had to switch to FJN3305 with internal 4.7k+10k resistors. I *thought* they worked OK. Obviously I was wrong!

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Since then, I bought some FJN3304 transistors with 47k+47k for my 1802MC. I'm going to try them in the Z80MC Front Panel to see if they are a better choice. If so, it's an easy change. :-)

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(An aside: Lots of manufacturers still make these pre-biased transistors. But a) they don't provide thru-hole versions any more, and b) instead of assigning 2Nxxxx numbers to facilitate 2nd sources, they hide them under house numbers.)

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Lee

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Excellence does not require perfection. -- Henry James

But it *does* require attention to detail! -- Lee Hart

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Lee A. Hart