My vintage 425 just started blowing one of the main 20A fuses for no
obvious reason. Yesterday, it had been idling (not in transmit mode)
for at least 10 hours and popped the fuse. I didn't realize what had
happened until I heard the fan quit. I didn't have time to check it
out until last night, when I replaced the fuse and fired it up. No
obvious problem, and I ran it for a while, then shut it down for the
night. This morning I fired it up again, called a half dozen CQ's on
80 at about 1 kW out (roughly 600 mA plate current, low grid
current) and 1:1 SWR, and it popped the fuse again.
The tubes are some "pulls" I bought and installed about 3 months
ago, and seem fine. No audible arcing.
Any ideas what to look for?
Jim Brown K9YC
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|