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1. Topband: Heater Choke Value (score: 1): Author: "Mike(W5UC) & Kathy (K5MWH)" <w5uc@suddenlink.net>; Date: Wed, 09 Jan 2013 15:36:50 -0600; Hello Fellow Topbanders: I have just started the process of converting a MLA-2500 amplifier from it's original 8875 tubes to Gi-7b tubes. Current;y I can run only abut 400 watts on Topband, (not from; /archives//html/Topband/2013-01/msg00062.html (7,304 bytes)
2. Re: Topband: Heater Choke Value (score: 1): Author: "Thomas Hoeppe" <thomas.hoeppe@asamnet.de>; Date: Thu, 10 Jan 2013 17:04:49 +0100; Hello Mike! I have built a linear using a GI46 tube (nearly a GI7B, only the cooler is a bit better). You see it at www.hoeppe.name I used 1mm wire CuL on a 1/2" ferrite rod. The rule is "as much as; /archives//html/Topband/2013-01/msg00066.html (9,164 bytes)
3. Re: Topband: Heater Choke Value (score: 1): Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>; Date: Thu, 10 Jan 2013 12:11:48 -0500; Hi, Mike Well, I would think that a reactance of perhaps 150-200 ohms at 160 ( if your conversion includes 160) would be sufficient. That should be sufficiently large relative to the tubes' input imp; /archives//html/Topband/2013-01/msg00067.html (8,715 bytes)
4. Re: Topband: Heater Choke Value (score: 1): Author: "ZR" <zr@jeremy.mv.com>; Date: Thu, 10 Jan 2013 16:52:23 -0500; Typical reactance rule of thumb is 5 to 10X the input impedance of the tube(s). In some cases it is much less and the 160M input network is modified to compensate. than 12 and require a lot less ferr; /archives//html/Topband/2013-01/msg00071.html (8,489 bytes)

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