Some Might Find this Useful

Google let me down in finding this. I have had a couple different ones over the years. Of course this is not extremely accurate but it is quick.

I actually dug it up from an old filing cabinet I have had forever.

Actually, if anyone needs, I could scan it at a higher resolution. That copy is at the default on the HP CM1312nfi. I'm pretty sure it can do better.

I remember there being other charts that helped with quick design. One had the mu of a tube plotted against plate load resistance and gave open loop voltage gain, something lke that.

For some reason these things are no longer aropund. Of course we can all do 1 over 2 pi FC, but when it is right there it is even better.

Anyway, if anyone asks for a higher resolution copy I will scna it and upload it. At the moment though, it aeems like it should work fine just the way it is.

I'd save and print a larger copy for the heck of it.

So, do you want a higher resolution copy ?

I'll rescan it, probably tomorrow. Been meaning to play with the settings o n that thing.

Actually I should have a highest resolution copy for the archive anyway.

The other thing here is that I am not designing somthing that ned like 43 d egrees phas shift but no less than 42 and no more than 44. You don't use th ese figures for everything anyway.

I usd this waybackwhen, when ?i designed some semi-parametric toe controls. They were force driven OP AMP based, totally mixing. the /bass was +/- 16 dB with the tuirnover continuously variable form 48 to 440 ?hz. Treble was also +/- 16 dB, with the turnover variable from 3 Khz to 10 Khz approximate ly.

On that one, the tone controls were designed like instrumentation, in a way . I'll have to redraw it to show you. It is not Bandazall or anything like it.

In fact yes, I am going to redraw that just to see what y'all think of it.

Prints ok here and OCR did a fine job.

sure. This something to print on big paper.

It looks like the nomographs in the ARRL Handbook.

Yes, those are neat, but I can remember the formulas well enough, and have calculators (and a slide rule, in case civilization collapses and I can't get batteries).