Hi Gents
I have 6m HB amp using a 1200A7.
At first it worked as a bronco;
burned RFC and LPF; it became a lamb
after adding a neutralization circuit.
Filament voltage/current:
1200A7: 7.5V / 21A
1200Z7: 6.3V / 25A
Base:
both fit for SK-410 but Z7 has dedicated grid ring.
A7 will work better with a neutralization.
Z7 stable with no neutralization.
I have heard 3-500Zs will get worse while
strage while 1200s not.
de Han JE1BMJ
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|