Does yours look like this one on the inside?
The trimpot at the lower-right in this pic is labeled "AM mod". This is the AM modulation limiter adjustment.
73
![iu7K9L.jpg](/proxy.php?image=https%3A%2F%2Fimagizer.imageshack.com%2Fimg923%2F9199%2Fiu7K9L.jpg&hash=412227fdd3b84d3ed2f88a7b7bf46c0a)
The trimpot at the lower-right in this pic is labeled "AM mod". This is the AM modulation limiter adjustment.
73