Help!

[Richard Bidwell]

Hi group  --  I'm new to the list and also returning to tube-powered radios and stuff after a lengthy absence.  As part of my reincarnation I've gathered a bunch of Heathkit test gear to do good things with.  This stuff has come from Ebay, and generally  it is quite satisfactiory.  My current problem is a Heath IG-72 Audio Generator.  The unit came in looking good and supposedly OK.  Well, it ain't OK.  The output is very weak and really not usable.  I've done all the good stuff like changing out electrolyics and paper caps, checked all connection, and replaced all 3 tubes even though the originals checked good.  This is far from a complex device but I'm stumped.  The first obvious thing is that the voltages that the manual gives are not what I see.  For example where voltage is supposed to be 410, it is 550!  Mybe when it is working properly, voltages would be correct.  I checked the power transformer and it seems OK.  The transformer ratio is 10 to 1 with a center tap.  The rectifier output is about 550 v. as noted above. This seems high.  Is this normal for this unit? Any advice or guidance would be most appreciated..  Cheers, Dick B.

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