My Airline is GROUNDED!

[asynchronousman]

I have a ~1951 Airline 15WG-1813B that developed a problem with the volume. It started popping up and down at random to variable levels. At no time did the quality of reception on either band suffer, only the volume. While I have never done any real fixing (no tools for one), I think I have an idea about what is wrong.

The set is found in Beitman's 1951 volume, page 63.

Since the reception didn't change, I would have to narrow it down to maybe three tubes and unknown.

6AV6 is the tube that handles AVC.
6V6 is the output tube.
6X5 is the rectifier.

Another man who fixes and sells mostly 1930's radios looked it over a while back and didn't see anything that stuck out, so this came up quickly. He also said both the IFs were fine. He has suggested trying a 6AT6, although I don't have that either, unless it's in the Hoffman or untested in the Stromberg Carlson TV combo I can part out. I have a friend fixing a VTVM up for me and I'm trying to come up with tubes and equipment. At 38, I'm a newbie.

I assume this is a series circuit, so nothing's gonna light up either.

Thank you, Steven