On Oct 2, 2006, at 12:15 AM, pentalab wrote:
--- In ham_amplifiers@..., Steven Grant <w4iiv@...>
wrote:
STEVEN SEZ... * In normal amateur service, i dont see how i could
ever drive the amp hard enough to roast the grid
even if mistuned (2 3-500Zs)
I dont tune with full power till im close to resonance btw
(maybe a 3CX800)
### partially agreed. IF u have a HV fuse... and it opens... the
grid current will skyrocket..... hence another reason for a fast
grid fuse.
#### STEVEN SEZ... * OK, question - will the fuse blow if the
tube becomes unstable
(parasitic oscillation)
#### Been a long time since I have experienced parasites.... seems
to me, both the plate current and grid current went beserko.
indeed
IF
the HV fuse opened off... the grid fuse would blow instantly...
quite soon is more like it
### Never had a problem with parasitics destroying a tube.. as
long as glitch R installed... grid and cathode fuses... and a HV
fuse.
As I see it, a HV fuse is obviated if the HV xfmr primary is fused. Also, a fuse is not as good as of a peak-current limiter as a glitch R.
later... Jim VE7RF
Yahoo! Groups Links
R L Measures, AG6K, 805.386.3734
r@..., , rlm@..., www.somis.org
