This is a last 10.7MHz IF-stage of commercial FM receiver.The construction for 150MHz not impossible, but very diffcult and need a wobblerscope for proper adjusting.
That's not the correct English word Sebi, but I know EXACTLY what you mean - but I can't remember what it's called!. I seem to recall it's a very similar word, but having read 'wobblerscope' I can't get that name out of my mind
But as for the circuit, we really need to know what he's trying to do, it's rather vague! - as you say, you wouldn't normally detect directly at 150MHz (which is round about the 2M band) - but down convert to an IF of 10.7MHz. You would also usually use a far more modern detector, this is probably pre 1940's technology (not counting the IF transistor of course, which isn't part of the detector).
Heh, yes that term came back to me also, we had a really ancient piece of gear in my high school electronics lab called a wobbuloscope. Tube based instrument, designed just for alignment work. Sort of a cross between a oscilloscope / spectrum analyzer. It and the signal / sweep generators with the "eye" tubes were very neat to use.
It's nice Nigel, i'm sure, You always understand my bad english.. (i never learn it, just read many datasheets and watch TV.. unfortunately in my country must be learn russian in scool)
Anyway, i have a scope with in-built wobbulator and the name on it "wobblerscope". (hungarian product, maybe the designer also learnt only russian....
It's nice Nigel, i'm sure, You always understand my bad english.. (i never learn it, just read many datasheets and watch TV.. unfortunately in my country must be learn russian in scool)