There should be very little difference in the power 80-10M, the tube is good
to 450 MHz and I get the same output on 6M as I do on HF.
Carl
KM1H
----- Original Message -----
From: "Roger (K8RI)" <k8ri@rogerhalstead.com>
To: <amps@contesting.com>
Sent: Tuesday, March 19, 2013 11:21 AM
Subject: Re: [Amps] SB-230 Power Question
On 3/19/2013 3:55 AM, K4MT wrote:
Its been a very long time since I owned an SB230 (bout 30-35 years, but
IIRC this is pretty much typical.
73
Roger (K8RI)
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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