"Alex Pogossov"
"Phil Allison"
But what is the load is not connected? Then the huge magnetisation
energy
** Why huge ???
If Lp is say 100H and Ia = 0.1A then how many Joules is that ?
Apparently 0.5J.
** IOW - **** all.
Even the smallest Varistor you can buy will absorb it with ease.
Like this one for $ 1.58 + gst
http://au.element14.com/epcos/b72205...9?Ntt=100+4399
Agree, it is no problem to clamp the surges, but the point is: why I have
not seen varistors across the OPT primaries in various schematics?
** Cos the usual RC network suppresses the spike sufficiently, along with
the load.
Or is the assumption that no one will be changing tubes on a working amp?
** Well, not with no load connected.
Or occasional arcing and sparking is not a problem?
** The Aussie made 6V6GT used in my first valve amp liked to spark
internally with no load.
Never did it, the A&R OP tranny or the socket any permanent harm.
But if you wanna go belt and braces - fine with me....
BTW - how much HT have you got ??
..... Phil