[Heathkit] sb200

[Peter Markavage]

Tell us what the plate input power is; can be determined from the meter
by calculation.
Tell us what band you are testing on; how much power are you driving the
SB-200 with; testing in SSB, AM, CW, or some other mode; testing into a
dummy load(?); how are you reading the output power; have you checked SWR
between exciter and amplifier. The tubes in my SB-200 are now 37 years
old and still perform well on SSB and AM.

Pete, wa2cwa

On Fri, 18 Aug 2006 18:16:24 -0700 "ted" <ted1970 at sbcglobal.net> writes:
> Still cant get full output from amp.Plate voltage near 2400.Have   
> -123 volts at grid.I replaced the 20uf and 2uf ,both rated 150 
> volts. Output abt 375watts.I noticed tubes can get red if keying a 
> little prolong.Only thing I havent done is install 2 new tubes.Tried 
> used spares. I just feel something else is wrong.When I key amp grid 
> voltage drops to say -54 volts.If anyone can help with some idea 
> ,greatly appreciated.Ted