[Amps] 8877 Needed

[Bill, W6WRT]

ORIGINAL MESSAGE:

On Tue, 18 May 2010 14:27:43 -0400, Roger <sub1 at rogerhalstead.com>
wrote:

> but like Carl I'd be 
>concerned about why the heater opened.
>Even pulls are not free and the 8877 is an expensive tube so I'd want 
>some insurance that the replacement would not be going bad any time soon.

REPLY:

The 8877 heater is very sensitive to over voltage. I was doing some
bench testing once and accidentally applied 6.3 volts instead of 5 and
the heater blew immediately. 

A very expensive mistake. Live and learn. 

73, Bill W6WRT