what is causing sqeualing in 12AX7/LM386 hybrid guitar amp?

J

JACK M

Guest
I recently made a small guitar amp according to this schematic;

http://www.sophtamps.ca/mambo/index.php?option=com_content&task=view&id=28&Itemid=39

however when using the amp whilst the gain is turned on even slightly a high frequency sqeualing occurs, what could it be? is it the tube (its new). or the wiring; here are some pictures of the amp:

http://aycu21.webshots.com/image/37900/2005056713895841154_rs.jpg

http://aycu20.webshots.com/image/40339/2005064695734689145_rs.jpg
 
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