[Diabolical Artificer]

I have a H1 which didn't work when I got it, it needed a new 6SN7, I also replaced a few electrolytics. I fitted mine with a BNC too and replaced a few resistors in the amplitude range switch. When i got a counter I tweeked mine to get it nearer to what's on the dial.

A few things to note when testing amps with these, first the THD specs aren't brilliant*, when you switch to sq wave it's twice the amplitude of the sine and lastly the amplitude range switch gives you odd values instead of 1v, 2v 5v for instance. i found this a pain when testing audio transformers; it's nice to put 1v in, instead of 1.23v, makes things simple.

That said I use my all the time, it's good for a quick sweep test, simply switch ranges, monitor the OP of the DUT on a scope, if the OP amplitude stays the same, frequency response is flat. also my H1 is bullet proof, since fixing it I've had no trouble at all, it just works.

* If you want a very low THD sinewave I have a simple circuit using a TL072 opamp, I use mine for very low THD+N measurements.

If you want a cable to fit your H1 without changing to BNC, pm me, should have one somewhere.

Andy.