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1. [Amps] Silly (use of) variac question (score: 1): Author: Scott Townley <nx7u@cox.net>; Date: Thu, 19 Jan 2006 23:55:21 -0500; OK...gonna slowly bring up an old amp that runs on 240VAC only. I have 240VAC into the shack and a 240VAC variac (Powerstat model 246). I went to hook it up and...I can't figure it out :-( The wall s; /archives//html/Amps/2006-01/msg00471.html (6,976 bytes)
2. Re: [Amps] Tuned Input (score: 1): Author: Scott Townley <nx7u@cox.net>; Date: Fri, 20 Jan 2006 13:32:16 -0500; Or a Delta Electronics "Operating Impedance Bridge"...which I have one of...maybe I'll do that this weekend on my 3-1000Z amp. Scott Townley NX7U Gilbert, AZ DM43di __________________________________; /archives//html/Amps/2006-01/msg00488.html (8,904 bytes)
3. [Amps] More: corded dial drive help (score: 1): Author: Scott Townley <nx7u@cox.net>; Date: Mon, 23 Jan 2006 7:53:12 -0500; I am unfamiliar with these types of mechanics so it may take me awhile to give all the right info. The pulleys here use a plastic-covered metal cord (probably steel wire). Each pulley has a gap on th; /archives//html/Amps/2006-01/msg00536.html (8,656 bytes)
4. [Amps] Observations on a Pi-L tank (score: 1): Author: Scott Townley <nx7u@cox.net>; Date: Fri, 10 Mar 2006 15:15:04 -0500; A rambling set of observations on Pi-L tank design and realization: Proposed amp is for 17m/12m, single 3-500Z, 650W output. It fills the gaps... First come up with design values for the Pi-L from TA; /archives//html/Amps/2006-03/msg00251.html (8,986 bytes)
5. [Amps] solid-state amp filter specs (score: 1): Author: Scott Townley <nx7u@cox.net>; Date: Tue, 8 Aug 2006 16:49:52 -0400; I don't know if this is a valid generic question, but here goes... With your "standard" solid-state amplifier, with multiple pairs of transistors in push-pull combined... What would be an acceptable; /archives//html/Amps/2006-08/msg00304.html (6,731 bytes)
6. [Amps] solid-state amp "suckout" (score: 1): Author: Scott Townley <nx7u@cox.net>; Date: Thu, 10 Aug 2006 16:13:59 -0400; I have a broadband, solid-state amp that seems to have a large-signal "suckout". The small-signal gain across the HF band is as expected, 10.5dB decreasing to 9.5dB at 30MHz. But under full drive, th; /archives//html/Amps/2006-08/msg00387.html (7,416 bytes)
7. [Amps] bandswitch wiper connection (score: 1): Author: Scott Townley <nx7u@cox.net>; Date: Tue, 5 Sep 2006 11:12:10 -0400; It seems that most anode bandswitching arrangements put the switch wiper more towards the output side of the pi or pi-L network (e.g., on a pi-net the switch wiper is on the load side of the inductor; /archives//html/Amps/2006-09/msg00099.html (7,319 bytes)
8. Re: [Amps] QST (score: 1): Author: Scott Townley <nx7u@cox.net>; Date: Mon, 18 Dec 2006 12:20:26 -0500; I have a complete collection of EIMAC application notes. Unfortunately the QST author doesn't specifically reference any one of them. However, FWIW I recognize what the author is referring to...the "; /archives//html/Amps/2006-12/msg00139.html (10,377 bytes)
9. Re: [Amps] HV wires, back-to-back diodes, and B- wiring (score: 1): Author: Scott Townley <nx7u@cox.net>; Date: Sun, 12 Sep 2010 07:55:57 -0700; With all this talk about B- diodes etc., I wonder what the recommended safety practice would be for an amp/supply arrangement where B- is not near ground potential; for example, a grounded-screen tet; /archives//html/Amps/2010-09/msg00118.html (8,131 bytes)
10. [Amps] Forced-air cooling system measurements (score: 1): Author: Scott Townley <nx7u@cox.net>; Date: Sun, 12 Sep 2010 13:25:26 -0700; The general recommendation for checking forced-air cooling system performance is to use a manometer to check back pressure. I wonder, isn't the "true" test the CFM in the exhaust? After all, if the b; /archives//html/Amps/2010-09/msg00130.html (7,672 bytes)

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