Heathkit Audio Generator?

[Clayton]

Hi,
I have two Heathkit Audio Generators one is an IG-72 and the other is
an AG-9.
If one had to choose between the two which one would you choose?
I am trying to figure out which one I should keep as they are both in
excellent shape(I will recap,etc... whichever one I keep)I know they
are not top of the line test equipment but they should do a beginner
just fine?

I was also wondering if anybody might know where I could download a
manual for them off the net?

Your help is most Appreciated
Thank You

[Carter-k8vt]

This site has a free download for the AG-9A, which is hopefully close
enough...but nothing for the IG-72. I'm not specifically familiar with
either unit, so I will leave that recommendation to others.

http://bama.edebris.com/manuals/heath/

Good luck and have fun...

[Carter-k8vt]

Further information...

The site above has the ENTIRE 22 page manual for the AG-9A; if you
scroll down a bit, it also has the SCHEMATIC ONLY for the IG-72.
Interestingly enough, a cursory examination of the schematics of both
units would seem to indicate that both units are virtually identical
electrically.

[Sofa Slug]

The IG-72 is just a later version of the AG-9. I think they are
virtually identical except for the cosmetics. If it's in good shape, I
would probably keep the IG-72 ...it's a great low distortion (for it's
time) sine wave generator. IIRC, I think Audio Amateur magazine had an
article back in the '70s or '80s for a mod to lower the distortion even
further.

-S

[jakdedert]

This thread led me to check BAMA (in vain, alas) for a manual for my
IG-1272 audio generator. It's operating fairly well, except for a
sigificant amount of--for lack of a better term--'amplitude bounce' when
I switch frequencies. It takes several seconds for the level to settle
in whenever I push one of the selectors.

Is this known problem? Otherwise, the signal appears clean on my scope
once the output settles down; but it swings pretty wildly until then.

jak

[William Sommerwerck]

> The IG-72 is just a later version of the AG-9. I think they are
> virtually identical except for the cosmetics. If it's in good shape,

> I would probably keep the IG-72... It's a great low-distortion
> (for its time) sine wave generator. IIRC, I think Audio Amateur

> magazine had an article back in the '70s or '80s for a mod to
> lower the distortion even further.

It did. I built the IG-72 with the AA mods. If anyone wants to purchase it,
please contact me directly.

[Tio Pedro]

"jakdedert" <jakd...@bellsouth.net> wrote in message
news:gtFuj.3564$IG1....@bignews9.bellsouth.net...

Do they use a lamp as part of the feedback mechanism to improve the
linearity? The "bounce" may be the filament temperature reaching
equalibrium.

Pete

[Alan Douglas]

> It takes several seconds for the level to settle
>in whenever I push one of the selectors.
>
>Is this known problem? Otherwise, the signal appears clean on my scope
>once the output settles down; but it swings pretty wildly until then.

As I remember (had one 40 years ago), it's normal.

Alan

[Clayton]

Thanks for the help everyone.
I'm not sure which one I am going to keep yet but I did get a hold of
a schematic for both and they are virtually the same unit just
cosmetic changes as Carter and Sofa Slug mentioned.

I am sorting through some things on the shelf and came across a
Heathkit IG-82 and was wondering if there is a need for both the
IG-82 and the IG-72 or AG-9?
I'm not sure if the IG-82 will do the same things plus as the other
two generators or not. I'm just starting to learn about them so I am
unsure if I should keep both?

Thanks for the help guys
Clay

[Clayton]

I forgot to ask if anybody knows where I could get a manual for the
IG-82? I have the schematic just no luck on the manual.

I was also wondering if anybody has a copy of the article from the
Audio Amateur magazine Sofa Slug mentioned?

Thanks Everyone

[jakdedert]

Thanks, Alan.

jak