[Amps] 8877 heater open circuit after shipping

[Alan Ibbetson]

The guy sent the open-heater 8877 back. Yes, the heater is open and yes, it
is the tube I sent him (date code and serial numbers match). So maybe the
valve really was broken in transit.

One final question, and clutching at straws. I see on the Ameritron AL1500
circuit diagram one side of the heater is hard wired to the cathode. On my
suggestion the guy had pushed the anode connection to one side and run his
AL1500 like this for a few hours "heater only, to fully getter the tube".
Is there any conceivable way this could have burned out the heater? The
circuit diagram in the manual is rather hard to follow!

73, Alan G3XAQ

On Sat, Mar 25, 2023 at 5:32?PM gudguyham at aol.com <gudguyham at aol.com> wrote:

> If it were me I?d want to see for myself that the filament went open!

-- 
Alan Ibbetson
alan at g3xaq.net