The SB-230 was designed to be used with the SB-104 which had slightly
lower output on 10m than the other bands.
My experience with my SB-230 (still have it, but don't use it) was
that 650 watts was pretty high output for 80m & 40m ...
I think your tube is fine.
73
Don
N8DE
Quoting K4MT <k4mt@yahoo.com>:
I recently acquired a SB-230 thinking the tube was probably bad with
an idea of doing a GI7B project. To my surprise the amp puts out
650 watts plus on my peak reading wattmeter on SSB 80/40 Meters
with 100 W drive..
On the bands from 20 and up the power output drops. 20 Meters is
about 550, 15 meters about 350-400 and I have not tried 10m.
I recapped PS, rebuilt tube grid circuit and repaired some bad
soldering and out of tolerance parts, replaced grid bypass
capacitors, removed entire tank circuit and band switch. Cleaned
bandswitch and cleaned/resoldered all connections.
Still power on higher bands drop as above.
Any experts on this amp out there who might have an idea what might
be going on. Is this a sign of a weak tube? Since I get so much
power output on 80/40M I would think the tube must still have some
life in it.
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