- 1. [Amps] Input Circuit (score: 1)
- Author: Jennings <leejen@paradise.net.nz>
- Date: Sun, 29 May 2005 02:18:09 +1200
- Hi all I am currently building an HF amp using a GS35B. It would appear that the input impedance is around 50 ohms + or - and most circuitry that I have seen does not use a tuned input circuit. I hav
- /archives//html/Amps/2005-05/msg00311.html (6,865 bytes)
- 2. [Amps] Tuned Input Question (score: 1)
- Author: Jennings <leejen@paradise.net.nz>
- Date: Sun, 29 May 2005 09:40:43 +1200
- Hi all Many thanks for the good advice from many of you. It appears that a tuned circuit is the way to go for many reasons. I will continue on in that direction. 73 de Lee ZL2AL ZL7AA, ZL8RI, ZL9CI,
- /archives//html/Amps/2005-05/msg00316.html (6,499 bytes)
- 3. Re: [Amps] TL-922 question. (score: 1)
- Author: Jennings <leejen@paradise.net.nz>
- Date: Wed, 01 Jun 2005 12:00:25 +1200
- Hi Tom and all The clue may be that one of the 3-500s has gone west with an internal short. I have had quite a few go over the years. 3-500Zs are prone to blowing up with an internal short. The brand
- /archives//html/Amps/2005-05/msg00328.html (11,542 bytes)
- 4. [Amps] Tuned Input Answers (score: 1)
- Author: Jennings <leejen@paradise.net.nz>
- Date: Sat, 04 Jun 2005 22:47:11 +1200
- Hi All Jorge, EA2LU asked for a copy of my replies to my question below: "Hi all I am currently building an HF amp using a GS35B. It would appear that the input impedance is around 50 ohms + or - and
- /archives//html/Amps/2005-06/msg00021.html (9,289 bytes)
- 5. Re: [Amps] Henry 2KD-5 120 Hz Hum (score: 1)
- Author: Jennings <leejen@paradise.net.nz>
- Date: Tue, 08 Aug 2006 21:44:17 +1200
- Interesting problem! I ran across a posting somewhere in the past 6 months on some reflector about a guy who was having hum nightmares with his 2 x GI7B amplifier. He tried all sorts of cures. It wou
- /archives//html/Amps/2006-08/msg00281.html (8,948 bytes)
- 6. [Amps] Passive Grid Resistor Source? (score: 1)
- Author: Jennings <leejen@paradise.net.nz>
- Date: Tue, 22 Aug 2006 14:12:19 +1200
- I am thinking of a passive grid driven configuration for a GU74B/Tetrode Board amp. I could parallel a bunch of 2W carbon resistors to make up 50 ohms at 100 watts, but the physical size worries me.
- /archives//html/Amps/2006-08/msg00584.html (6,473 bytes)
- 7. [Amps] Thanks for Help (score: 1)
- Author: Jennings <leejen@paradise.net.nz>
- Date: Fri, 25 Aug 2006 15:19:18 +1200
- Thanks for all the help and advice on 50 ohm non- inductive resistors. VE7RF pointed me in the direction and Norm N8NH and a source was found 73, Lee ZL2AL ___________________________________________
- /archives//html/Amps/2006-08/msg00644.html (6,369 bytes)
- 8. Re: [Amps] Henry 3K-A Step Start Resitor Cone (score: 1)
- Author: Jennings <leejen@paradise.net.nz>
- Date: Thu, 07 Sep 2006 13:37:05 +1200
- Hi Bob. It's a simple coiled piece of nichrome wire. If you can figure out the length and the gauge you could probably wind one on a knitting needle and then put back on the old former. We had a lot
- /archives//html/Amps/2006-09/msg00135.html (8,477 bytes)
- 9. [Amps] Parts For Sale (score: 1)
- Author: Jennings <leejen@paradise.net.nz>
- Date: Fri, 25 Apr 2008 11:15:05 +1200
- Hi all I have a very large Jennings X 700 7,500 VDC Vac Variable capacitor for sale. I assume it is 700pf but not sure. I also have a very large ceramic bandswitch - Each of the 5 separate sections h
- /archives//html/Amps/2008-04/msg00295.html (6,846 bytes)
- 10. [Amps] Transformers (score: 1)
- Author: Jennings <leejen@paradise.net.nz>
- Date: Mon, 05 May 2008 10:38:23 +1200
- With the high price of Peter Dahl transformers, I used a toroidal wound unit from Antek Inc. Their eBay store is at http://stores.ebay.com/Antek-inc The unit I use to run 2 x 3-500s is rated at 800VA
- /archives//html/Amps/2008-05/msg00048.html (7,132 bytes)
- 11. [Amps] 3CX400A Substitutes (score: 1)
- Author: Jennings <leejen@paradise.net.nz>
- Date: Mon, 26 May 2008 23:11:05 +1200
- I have an Alpha 374A with a good pair of 3CX400As in it. They may last years but may also go west next week. One never knows. Has anyone come up with a suitable triode tube conversion or even a conve
- /archives//html/Amps/2008-05/msg00190.html (6,581 bytes)
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