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1. [AMPS] Eimac 4CX600J comments? (score: 1): Author: nx7u@primenet.com (Scott Townley); Date: Sun, 07 Feb 1999 19:56:37; I was just browsing thru my Eimac catalog and noticed the 4CX600J...designed for AB1 service, low IMD specs, reasonable PS requirements, could use the ubiquitous 4X150/4CX250 sockets... I'm curious w; /archives//html/Amps/1999-02/msg00233.html (7,610 bytes)
2. [AMPS] Another angle on cathode-matching ckts (score: 1): Author: nx7u@primenet.com (Scott Townley); Date: Fri, 12 Feb 1999 18:09:12; I've followed the thread on cathode-driven input networks using toroids, and the general advise that coax between the "tank" and tube filaments is a bad thing. Although I have not seen a great many a; /archives//html/Amps/1999-02/msg00349.html (8,527 bytes)
3. [AMPS] TX Ant gain vs. RX Ant gain (was: Dollars per dB) (score: 1): Author: nx7u@primenet.com (Scott Townley); Date: Fri, 01 Jan 1999 15:52:23; It depends...this is a complex (and interesting!) subject not covered in too many places. The prevailing theory (from a CCIR bulletin whose nomenclature doesn't come to me right now) is that "static"; /archives//html/Amps/1999-01/msg00017.html (12,837 bytes)
4. [AMPS] TX Ant/RX Ant Gain and Noise...again (score: 1): Author: nx7u@primenet.com (Scott Townley); Date: Fri, 01 Jan 1999 21:04:51; Well, I don't enjoy this but MEA CULPA My statements regarding S/N and horizontal directivity were incorrect. Review of the CCIR report I cited (CCIR 322-2) has a specific paragraph regarding directi; /archives//html/Amps/1999-01/msg00021.html (7,801 bytes)
5. [AMPS] FC-30(A) and filament circuits-again! (score: 1): Author: nx7u@primenet.com (Scott Townley); Date: Thu, 03 Dec 1998 22:15:35; Those with long memories will recall I was whining about insufficient filament voltage in my (2)3-500Z amp... Well, I solved that problem by biting the bullet and finding room on the RF deck for the; /archives//html/Amps/1998-12/msg00041.html (8,625 bytes)
6. [AMPS] G2DAF amp (score: 1): Author: nx7u@primenet.com (Scott Townley); Date: Sun, 01 Nov 1998 21:34:18; Just following the thread on the reflector. "supercathode" drive I was squawking about earlier this fall. Supercathode: drive grid and cathode together, ground screen so Esc=-drive voltage G2DAF: dri; /archives//html/Amps/1998-11/msg00027.html (8,599 bytes)
7. [AMPS] High current filament circuits (score: 1): Author: nx7u@primenet.com (Scott Townley); Date: Tue, 10 Nov 1998 06:53:06; One of the principle maladies of my 2x 3-500z HB amp I've acquired is low filament voltage at the tube socket--all of 4.3V. The filament xfmr is in the main power supply cabinet, going thru a run of; /archives//html/Amps/1998-11/msg00150.html (9,195 bytes)
8. [AMPS] Heath QSK board Q? (score: 1): Author: nx7u@primenet.com (Scott Townley); Date: Tue, 10 Nov 1998 06:54:04; The Heath SBA-2001-1 QSK board...for the SB-1000...anyone know if it's adaptable to "any" amplifier? Or does it have a "proprietary" interface, so to speak? Thanks again. -- Scott Townley nx7u@primen; /archives//html/Amps/1998-11/msg00151.html (7,016 bytes)
9. [AMPS] Drake L7 Plate RFC (score: 1): Author: nx7u@primenet.com (Scott Townley); Date: Tue, 24 Nov 1998 22:13:02; An acquaintance of mine parted out an L7 recently and I ended up with the anode choke. An interesting device: 1" dia. ceramic form 2 sections, close wound, about 1-3/4" in length each, with about a 1; /archives//html/Amps/1998-11/msg00323.html (7,865 bytes)
10. [AMPS] Cathode Driven Tetrodes (more normally...) (score: 1): Author: nx7u@primenet.com (Scott Townley); Date: Thu, 01 Oct 1998 22:24:00; OK, I've put Supercathode drive on hiatus, figuring I should start with plain old triode-connected cathode-driven tetrodes. There's plenty of published data on 4-1000A in triode-connection, so I pull; /archives//html/Amps/1998-10/msg00008.html (9,089 bytes)
11. [AMPS] Hybrid combiner questions (score: 1): Author: nx7u@primenet.com (Scott Townley); Date: Tue, 06 Oct 1998 19:56:32; Well, at HF they can be interesting. You can easily build them in a trifilar transformer configuration...use a large ferrite toroid or two and wind it around with three wires. I can look up the exact; /archives//html/Amps/1998-10/msg00047.html (10,018 bytes)
12. [AMPS] HK-254 and 100TH--how similar? (score: 1): Author: nx7u@primenet.com (Scott Townley); Date: Sun, 13 Sep 1998 16:07:56; I have an older Motorola-made amplifier that uses a pair of HK-254 tubes in push-pull, evidently an old low-band VHF jobber as it tunes up on 6m quite nicely. Looking in an old Radio Handbook (10th e; /archives//html/Amps/1998-09/msg00168.html (7,796 bytes)
13. [AMPS] Nat'l R175 vs R175A choke (score: 1): Author: nx7u@primenet.com (Scott Townley); Date: Tue, 22 Sep 1998 16:37:02; I believe I've devined from the old ads that the National R-175 plate choke was pre-15m and the R-175A was redesigned for post-15m bands. The question is (if I've gotten my history right), how do you; /archives//html/Amps/1998-09/msg00235.html (7,377 bytes)
14. [AMPS] PL-172 as GG Triode? (score: 1): Author: nx7u@primenet.com (Scott Townley); Date: Wed, 23 Sep 1998 07:08:47; I have a homebrewed PL-172 amp deck I'm working on (someone else's I bought cheap...don't throw rocks at me!). In tracing thru the circuit, it's a cathode-driven amp with provision for grid bias, but; /archives//html/Amps/1998-09/msg00242.html (7,951 bytes)
15. [AMPS] Supercathode drive...how to calculate? (score: 1): Author: nx7u@primenet.com (Scott Townley); Date: Thu, 24 Sep 1998 21:35:13; Ah, another strange question from that guy in Arizona... The question is: how do you calculate the operating conditions for driving a tetrode in the supercathode drive circuit? I have constant curren; /archives//html/Amps/1998-09/msg00263.html (9,592 bytes)
16. [AMPS] More ? on Supercathode drive (score: 1): Author: nx7u@primenet.com (Scott Townley); Date: Sat, 26 Sep 1998 15:33:10; Thanks to those who followed up on my original questions on supercathode drive. 1. I think I've solved my "plate voltage swing" dilemma...it's an iterative process but it will work. If you combine tw; /archives//html/Amps/1998-09/msg00275.html (9,446 bytes)
17. [AMPS] ? Voltage Doublers as Anode Supplies (score: 1): Author: nx7u@primenet.com (Scott Townley); Date: Mon, 31 Aug 1998 21:43:58; Heath and I'm sure many others made a bit of coin using full-wave voltage doublers for their anode supplies. I've been trying to "design" one myself. I've been using the output voltage curves in Lang; /archives//html/Amps/1998-08/msg00252.html (9,512 bytes)
18. [AMPS] Input Circuits and Switching Measurements (score: 1): Author: nx7u@primenet.com (Scott Townley); Date: Sat, 11 Jul 1998 12:10:51; My 2x 3-500z homebrew never did a very good job on input matching on 10m; couldn't get it below 2:1 VSWR and the power output showed it...750W out with 2500V on the plate. I have a network analyzer a; /archives//html/Amps/1998-07/msg00060.html (9,915 bytes)
19. [AMPS] RFC and Tank measurements (score: 1): Author: nx7u@primenet.com (Scott Townley); Date: Sat, 06 Jun 1998 22:28:04; I made some measurements of my homebrew amp output tank and RFC this weekend that may be of passing interest (OTs can ignore!). Following a suggestion by (I believe) Tom W8JI I made a phantom tube us; /archives//html/Amps/1998-06/msg00102.html (9,321 bytes)
20. [AMPS] source for slug-tuned coil forms? (score: 1): Author: nx7u@primenet.com (Scott Townley); Date: Wed, 10 Jun 1998 05:40:39; I've been looking thru all my sources and I can't seem to locate a source for the old slug-tuned inductor forms that are typically used in the tuned-input sections for amplifiers. My old homebrew amp; /archives//html/Amps/1998-06/msg00132.html (7,311 bytes)

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