Hi guys...
Been working on a sb220.. did the rectifer and choke mods. Replaced with
Harbah parts.
I have noticed that i don't have a idle plate and grid currant. All seems
to run ok. 10 watts drive on 40 meters shows .2 plate amps and about .3grid
ma. I like to run my radio into the amp at about 10 watts for 100-150 out for
rtty contesting. Ran the roundup and all worked good at this power level.
i noticed that the right tube will glow some and the left tube does not. I
also replaced the relay for mine was humming. When I was putting it the new
relay in I see that someone as added some caps from the input coax sheild to
the bare wire jumper from pin 1 and 3 on the relay. I hooked it back on. I
have not seen anywhere in posts about this cap. Is it normal to not see any
idle plate and grid with the mods. I did pull the zener diode that was
hooked to the rectifier board and was wonder if that was keeping it with no
idle.
First time working on a amp.
tu for your information and work in this message board.
Pat
n7uvh
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