The first thing Id check is for an open 33 Ohm grid resistor and cracked
200pf mica cap at the sockets. You could be running on just one tube.
----- Original Message -----
From: "Tom Osborne" <email@example.com>
Sent: Wednesday, February 08, 2012 9:33 PM
Subject: [Amps] SB-200
> Hi All.
> I have a SB-200 and it developed a problem in the last week or so.
> When tuning up on 40, the Load cap is all the way meshed and the Tune cap
> is about 50% meshed. It puts out about 400 watts on 40. On 40, the input
> SWR is 1:1.
> In 80 the Load cap is all the way meshed. It puts out about 200 watts.
> The input SWR is 1:1.
> I checked to make sure the 2 sections of the Load cap were soldered
> together OK and they are. I disconnected the cap that is switched in on
> 80 and replaced it with another one and still doing the same thing.
> If the tubes are going soft, will it affect the tuning like that? Seems
> like I've replaced the tubes before but never had the problem of the Load
> cap being all the way meshed to load on 40. Thanks and 73
> Tom W7WHY
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