Tore;
I vote for the pair of Svetlana GI-7b or GI7BT(same tube) triodes as
replacement tubes for the SB-230.
Tore if you will look at this page on my web site,
http://www.tomstubes.com/amp-conversions/
You will see a conversion a customer of mine did on a Dentron amp that
ran 4 572b tubes. He used a pair of the Svetlana GI7B triodes, and is
getting about 1200 to 1300 watts out with about 50 to 70 watts of drive.
I dont know the SB-230, so i dont know how much room you would have in
the amp, but a pair of the gi7b tubes would be a little larger than a
pair of the 3cx800a7 tubes. They would also be about $425.00 per tube
cheaper than the 3cx800a7 tubes!
I am not trying to sell you the tubes, my friend Anton at DXHAM.COM can
put you in a pair of those very cheaply. I do have the sockets for those
tubes however which are nearly impossible to find....Just telling you in
case you need them.
73
Tom.......W4TH.......Tom's Tubes
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Be sure to visit my web sites.
Tom's Tubes. Russian Tubes our speciality..We now carry the Bliss Match
Master line of antenna tuners and antenna switches. Legal Limit PLUS.
http://www.tomstubes.com
Ham Radio Homepage.
http://www.geocities.com/bamagramps
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