Look at 
http://www.cpii.com/docs/related/23/Tube%20Ratings%20Data%20for%20Devices%20Rebuilt%20by%20ECONCO.pdf
It appears that ECONCO does rebuild some tubes as low as 1000 Watt plate 
dissipation but only the rarer industrial, medical or scientific types.
I suspect that if they did 8877's they would be over run by ham and CBers 
and would not be able to take care of the other customers. I had a 
3CW20,000 rebuilt one time for a sputtering power supply.
    You can always ask if they will rebuild it.
73
Bill wa4lav
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