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So far I have purchased two of Dan's gi7b conversions. The first one I purchased was heathkit sb-230. The amp worked great up to the day I traded it to my friend and till this day he's still running it. With little over 30 watts of drive the amps does 600 watts. The second amp I purchased was a dentron 160-10l converted to use two gi7b. The amp works great, easily does 1000+ watts. I sti use it to this day. With the prices of modern glass envelope tubes going through the roof it's hard to beat the prices of gi7b tube.

Dan definitely knows his stuff.

Charles Kd8niw 73