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1. [Amps] SB-221 Power Gain (score: 1): Author: Michael Tope <W4EF@dellroy.com>; Date: Fri, 31 Jul 2020 23:01:35 -0700; I have an old SB-221 donated from the estate of the original builder. I think it was assembled in 1981. With 100 Watts of drive and the HV switch in the SSB position (stiff 240V service), I am gettin; /archives//html/Amps/2020-08/msg00000.html (7,328 bytes)
2. Re: [Amps] SB-221 Power Gain (score: 1): Author: Artek Manuals <Manuals@ArtekManuals.com>; Date: Sat, 1 Aug 2020 05:48:23 -0400; Mike Numbers are in the ball park You might get up to 1200-1250 with a new pair of tubes . A pair of new 3-500ZG's is going to run you in the neighborhood of $450. The bigger issue on power out is yo; /archives//html/Amps/2020-08/msg00001.html (9,614 bytes)
3. Re: [Amps] SB-221 Power Gain (score: 1): Author: Jim <jimw7ry@gmail.com>; Date: Sat, 1 Aug 2020 07:43:32 -0500; Most likely the tuned input. Does it have 10 meters in it? Did the builder or adder of 10 meters do it correctly? The best place to increase the efficiency of an SB220/221/HL2200 is the tubed input.; /archives//html/Amps/2020-08/msg00002.html (8,889 bytes)
4. Re: [Amps] SB-221 Power Gain (score: 1): Author: Michael Tope <W4EF@dellroy.com>; Date: Sun, 2 Aug 2020 19:51:39 -0700; Thanks to everyone who responded to my questions. The consensus of the responses is that the numbers I am getting are typical for an SB-221 with 100 watts drive. I agree with those who suggested that; /archives//html/Amps/2020-08/msg00014.html (9,242 bytes)

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