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1. [Amps] Options (score: 1): Author: Martin Sole <msole@loxinfo.co.th>; Date: Sat, 05 Aug 2006 12:45:43 +0700; Start with an assumption. You have a quantity, i.e. more than 10, Eimac 8930's (4CX350R some say) with bases and teflon chimneys. Tubes are unknown condition but were removed from service a couple of; /archives//html/Amps/2006-08/msg00197.html (7,002 bytes)
2. Re: [Amps] Options (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 06 Aug 2006 08:27:55 +0100; What's minimal - modest power or no frills, or? What are you wanting out of it - a simple amp for minimum effort or some fun experimenting? If it's the former, I think there's incompatibility in the; /archives//html/Amps/2006-08/msg00201.html (8,102 bytes)
3. Re: [Amps] Options (score: 1): Author: "David G4FTC" <g4ftc@hotmail.com>; Date: Sun, 06 Aug 2006 08:28:02 +0000; One of the problems with trying to build a multi-tube amp using tubes of unknown and variable characteristics is keeping the tubes balanced. To build an effective multi-tube amp would really require; /archives//html/Amps/2006-08/msg00202.html (8,755 bytes)
4. Re: [Amps] Options (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sun, 6 Aug 2006 10:13:58 +0100; The 8930 is a 'special' version of the 4CX250R with an over-sized 350W anode cooler. Steve is right - your HV transformers are not well suited to the tubes, so think about them separately. Other majo; /archives//html/Amps/2006-08/msg00203.html (9,790 bytes)
5. Re: [Amps] Options (score: 1): Author: Alek Petkovic <vk6apk@eon.net.au>; Date: Sun, 06 Aug 2006 17:37:41 +0800; I have four unused GI7Bs here and I'll be in Bangkok in 8 weeks time. I can save you some postage if you want to go down that line and can wait that long. I'll be happy to swap them into local curren; /archives//html/Amps/2006-08/msg00204.html (7,931 bytes)
6. Re: [Amps] Options (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 6 Aug 2006 14:24:02 +0200 (CEST); Pappenfus describes a method matching tubes with varying the screen volts and having individual bias pots - in that example, 3 off 4CX250B. It should be possible to check emission by checking contact; /archives//html/Amps/2006-08/msg00207.html (7,646 bytes)
7. Re: [Amps] Options (score: 1): Author: Bill Turner <dezrat@copper.net>; Date: Sun, 06 Aug 2006 10:08:19 -0700; ORIGINAL MESSAGE: -- REPLY SEPARATOR -- I'd suggest testing the tubes first before building the amp around them. Since you are going to build the power supply anyway, do that first. Then rig up a tem; /archives//html/Amps/2006-08/msg00220.html (8,282 bytes)

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