[Amps] 8877 heater open circuit after shipping

[Steve Thompson]

I have two of them where the heaters measure open when they are upside 
down but normal when upright. That way up they work fine as long as the 
heater supply doesn't have high inrush current. They are MRI machine 
pulls, can't remember if they were like that when I got them.

Another one (completely unconnected) was in an amp used for /p 
contesting. Over 20odd years that survived hundreds of trips across 
rough terrain and close on a thousand miles on the road in a barely 
sprung trailer. As far as I know it's still going strong.

Steve G8GSQ

On 25/03/2023 16:52, Alan Ibbetson wrote:
> I just shipped an Eimac 8877/3CX1500A7 date code 1981 from England to
> Northern Ireland. I used a genuine Eimac foam filled box. it arrived with
> an open circuit heater. Is this a common failure? Are the heaters in these
> tubes especially fragile or have I just been unlucky?
> 
> 73, Alan G3XAQ
>