Posted by CheckthePIN5Connection on August 31, 2006 at 12:23:43

In Reply to: dynaco 70 problem posted by bg on August 30, 2006 at 09:45:42:

Seen Grids go +, happened on a Dyn MKIII...the tube went in to melt down...a new 6550 took about 120mA b4 shut off...tested had less than 20% of life left after that...surprisingly fuse and rect. did not blow.

Cause, PIN 5 cable was not connected...solder joint dropped out.

Check Output socket Solder joints and connections, all of them.