wrote in message
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I've been looking into buying an Audio Generator (Sine and Square Wave).
I mainly want this to run thru an amplifier to listen to the frequency
repsonse of the amp and speakers. Nothing very scientific, just to see
what these amps and speakers can do.... And on occasion to inject an
audio signal into amp sections to dee if the audio is passing that
stage.

Originally I was looking at some of the old tube gear, such as the Eico
model 377. I also looked at the Heathkit IG-18 a transistorized version
from the 70s. Because I like that old test gear, I'd be happy to get
either of these, or another similar. Both of these are Sine and Suqare
Wave.

Plenty of cheap function generators out there that do the basic sine,
triangle and square-wave.

Its worth checking the spec - if they start with sq-wave and convert to
triangle and then sine; the sine could be a bit lumpy.

Starting with sine gets better wave purity, but accuracy is not so good and
the sq-w M/S ratio can be off.

There are some good articles out there on testing audio response with other
waveforms - a perfect square wave is the sum of an infinite series of sine
waves. Taking that the other way round - a half-decent square-wave can tell
you as much as a lot of different sinewaves all at once.

At one time it was trendy to test audio with sawtooth, but I haven't seen
any new articles recently.