[AMPS] Q:SB-220 plate voltage and current??

[Yoshi]

I have two questions.

1. 
I am using SB-220 with 200V (here is JA). When the mode is CW/TUNE, plate
voltage is 1.8KV. Then drive power is 100W and tune linear, plate current
will be 0.6A and 800W out. The tubes are 3-500ZG.
I wonder if 0.6A current for pear of 3-500Z (or 3-500ZG) tubes is
dangerous?
Some stations reported my signal is bursting.
How much current is safety and keep good condition of tubes?

2.
What's difference between 3-500Z and 3-500ZG?
I only know these tubes have compatibility.

7.3 DE AB7TA Yoshi

--
FAQ on WWW:               http://www.contesting.com/ampfaq.html
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm