- 1. [AMPS] 813 question (score: 1)
- Author: k4gf@worldnet.att.net (james fisher)
- Date: Sun, 3 Oct 1999 10:55:59 -0400
- Is the input impedance of a pair of 813 tubes, grounded grid configuration, close enough to the magic 50 ohms to accept power from a modern exciter with simply a parallel low-Q circuit shunted from i
- /archives//html/Amps/1999-10/msg00061.html (7,021 bytes)
- 2. [AMPS] 813's (score: 1)
- Author: k4gf@worldnet.att.net (james fisher)
- Date: Sun, 3 Oct 1999 16:56:49 -0400
- Thanks to each of you who replied to my question about the 813 input impedance. It looks like the pi will be needed, HAMCALC gives me the values. Perhaps about Christmas you can all hear the amp! 73,
- /archives//html/Amps/1999-10/msg00073.html (6,609 bytes)
- 3. [AMPS] EM marked caps (score: 1)
- Author: k4gf@worldnet.att.net (james fisher)
- Date: Sun, 07 Dec 97 15:23:58 PST
- I have come into a bunch of 200 pf capacitors which look like the ones pictured as dipped micas in the mouser catalog. However, they are marked with the value followed by the letters EM...does that m
- /archives//html/Amps/1997-12/msg00111.html (7,080 bytes)
- 4. [AMPS] re:autotransformer (score: 1)
- Author: k4gf@worldnet.att.net (james fisher)
- Date: Mon, 17 Nov 97 11:54:52 PST
- Whenever I get a transformer, I run up the primary with a variac, watching the primary current. No load on the secondary. Older transformers, WW2 vintage, are poor performers, with 110 volt or 220 vo
- /archives//html/Amps/1997-11/msg00230.html (6,810 bytes)
- 5. No subject (score: 1)
- Author: k4gf@worldnet.att.net (james fisher)
- Date: Thu, 09 Oct 97 19:28:44 PDT
- Oct, 1997, from K4GF: My winter project this year will be to up-date and rebuild an old amp using a pair of 811-A tubes. Of several ways to limit the available 100 watts of drive I would like to simp
- /archives//html/Amps/1997-10/msg00056.html (6,989 bytes)
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