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1. [Amps] QB3-300 Amplifier (score: 1): Author: Alberto <re349@yahoo.com>; Date: Thu, 28 Oct 2004 04:44:05 -0700 (PDT); Hello! Recently, i got some spare QB3-300 tubes (equivalent SRS455, 6155, 4-125), so I´m planning a new SSB amplifier using them. I've seen lots of configurations for these tubes in PA operatio; /archives//html/Amps/2004-10/msg00478.html (7,374 bytes)
2. Re: [Amps] QB3-300 Amplifier (score: 1): Author: "Peter Frenning, OZ1PIF" <oz1pif@privat.dk>; Date: Thu, 28 Oct 2004 13:54:29 +0200; These tubes work very well in GG, see my FL2000 conversion on my homepage below.. (They are low power relatives of the QB3,5/750 and QB4/1100 etc) Vy 73 de OZ1PIF, Peter ** OZ1PIF ** email: oz1pif(no; /archives//html/Amps/2004-10/msg00479.html (8,410 bytes)
3. Re: [Amps] QB3-300 Amplifier (score: 1): Author: Alek Petkovic <vk6apk@eon.net.au>; Date: Thu, 28 Oct 2004 21:30:31 +0800; Yep, I'll second that. I built a sinfully ugly, cheap and indestructible amp with a pair in GG. Still working as good as ever 15 years on with the original tubes. 73, Alek. VK6APK At 07:54 PM 28/10/2; /archives//html/Amps/2004-10/msg00481.html (9,474 bytes)
4. Re: [Amps] QB3-300 Amplifier (score: 1): Author: R.Measures <r@somis.org>; Date: Thu, 28 Oct 2004 08:06:47 -0700; On Oct 28, 2004, at 4:44 AM, Alberto wrote: Hello! Recently, i got some spare QB3-300 tubes (equivalent SRS455, 6155, 4-125), so I´m planning a new SSB amplifier using them. I've seen lots of c; /archives//html/Amps/2004-10/msg00488.html (9,446 bytes)
5. Re: [Amps] QB3-300 Amplifier (score: 1): Author: Alberto <re349@yahoo.com>; Date: Fri, 29 Oct 2004 02:33:28 -0700 (PDT); Thanks Alek, Richard and Peter for your answers. Richard, thanks for the notes about high voltage capabilities of these tubes. I'll use a HV supply of 2.500V since this output is available in my shac; /archives//html/Amps/2004-10/msg00495.html (11,121 bytes)
6. Re: [Amps] QB3-300 Amplifier (score: 1): Author: "Peter Frenning, OZ1PIF" <oz1pif@privat.dk>; Date: Fri, 29 Oct 2004 11:50:54 +0200; Alberto, Pls note that g2 always must be at same or higher potential as g1, g2 potential can be used as a very convenient gain regulation. If tied together the gain will be approx. 6-7dB at 2.5KV Vy; /archives//html/Amps/2004-10/msg00496.html (12,030 bytes)
7. Re: [Amps] QB3-300 Amplifier (score: 1): Author: "DEHAYS Dominique" <Dominique.DEHAYS@enac.fr>; Date: Fri, 29 Oct 2004 13:09:38 +0200; Let's have a look at the ARRL handbook : vacuum tubes and semiconductors: 4-125 ( equivallent tube for QB3-300) GG: max power is 145w withone tube used in triode mode. Don't forget that in this mode; /archives//html/Amps/2004-10/msg00500.html (7,760 bytes)

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