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1. Reply to: [BULK] - [Amps] NCL 2000? (score: 1): Author: craxd <craxd1@ezwv.com>; Date: Thu, 02 Oct 2003 12:40:39 -0400; Hello all, The Burle 4662 and the 8122 is a totally different beast. Even though they are wired internally the same and in the same envelope, the plate and grid voltages are completely different alon; /archives//html/Amps/2003-10/msg00019.html (7,724 bytes)
2. [Amps] RCA, Burle tubes and parts (score: 1): Author: craxd <craxd1@ezwv.com>; Date: Sun, 05 Oct 2003 15:21:14 -0400; Hello, Where a few seemed to benefit from the Burle info about the National amp, I wanted to leave this info for all. I just received my new copy of Burle product reference on CD yesterday. It contai; /archives//html/Amps/2003-10/msg00040.html (7,727 bytes)
3. [Amps] reply for: Capacitor Recommendation Needed (Dennis Ashworth) (score: 1): Author: craxd <craxd1@ezwv.com>; Date: Mon, 06 Oct 2003 00:13:00 -0400; If I were you wanting to replace that 1000 pF vacuum variable with something else, I'd try a good, large doorknob capacitor. The higher voltage ratings have large current ratings also. You'd have to; /archives//html/Amps/2003-10/msg00041.html (7,507 bytes)
4. [Amps] Reply for "Tuned transformer". (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Tue, 18 May 2004 18:48:58 -0400; Angel, What you have there isn't a "tuned transformer". Those are filters to stop RFI and TVI from going out through the line. I imagine that is a single phase transformer too. Really, one leg of the; /archives//html/Amps/2004-05/msg00152.html (7,178 bytes)
5. [Amps] Re: Tuned power transformer (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Wed, 19 May 2004 15:52:32 -0400; I thought I'd try to describe in a little more detail about power transformer construction. I had received several e-mails asking me about this so I hope this will help. Originally I didn't notice th; /archives//html/Amps/2004-05/msg00166.html (8,726 bytes)
6. [Amps] Transformmer design (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Thu, 20 May 2004 11:39:18 -0400; Here is the quotes from the Howard Sams book, "Practical Transformer Design" written by Eric Lowden. Quote; "Although there are many equations associated with transformer design, all of them fundamen; /archives//html/Amps/2004-05/msg00173.html (7,714 bytes)
7. [Amps] Transformer core sizes (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Thu, 20 May 2004 15:13:11 -0400; The below core sizes are in square inches and are determined from the formula below using M6 laminates or similar (mild steel). Formula; 0.16 x Square root of P P = Power in watts wattage = sq in.: 1; /archives//html/Amps/2004-05/msg00176.html (6,740 bytes)
8. [Amps] Transformer frequency differences (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Fri, 21 May 2004 02:01:41 -0400; When I made a comment to the post about the differences between 50 Hz and 60 Hz transformers and mentioned that the voltage could rise if the frequency was increased something sounded odd to me about; /archives//html/Amps/2004-05/msg00184.html (11,071 bytes)
9. [Amps] Transformer book (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Fri, 21 May 2004 12:15:33 -0400; Ian the ISBN number and other details are below. Hope this helps! Title: Practical Transformer Design Handbook Author: Eric Lowden Publisher: Howard Sams Publishing Date: 1980 Sams No.: 21657 ISBN No; /archives//html/Amps/2004-05/msg00188.html (8,158 bytes)
10. [Amps] Note on paralelling transformers (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Fri, 21 May 2004 12:43:37 -0400; I figured I might as well add this because home brew amps have used paralleled transformer in the past to either increase the voltage or the current. When connecting the transformer windings, they mu; /archives//html/Amps/2004-05/msg00189.html (7,992 bytes)
11. [Amps] Transformer website (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Sat, 22 May 2004 11:20:52 -0400; Since all the interest has came up about transformer design, and there really isn't anything on the web I've found about it, would anyone be interested in me putting up a website with all the informa; /archives//html/Amps/2004-05/msg00199.html (6,786 bytes)
12. [Amps] 12 tube 3-500Z (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Tue, 25 May 2004 11:04:41 -0400; That 12 holer on ebay using (12) 3-500Z's is a piece of work aint it? You would need at least 1 Kw to drive the thing where no standard radio could ever drive it. Although, it is possible to do this,; /archives//html/Amps/2004-05/msg00223.html (7,179 bytes)
13. [Amps] 12 holer 3-500Z (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Wed, 26 May 2004 13:50:18 -0400; Hal, I noticed that too (parasitic suppressors) but found so many things wrong, I just got tired of writing about them! I also got a kick out of the brag on it using a Bird meter. It looked to me to; /archives//html/Amps/2004-05/msg00241.html (8,348 bytes)
14. [Amps] Bear, 4-400 question (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Wed, 26 May 2004 15:27:43 -0400; Bear, "Q1: 4-400 No fil voltage applied, B+ applied, screen grounded, gridopen, floating. Tube fries??" Without the heater running to heat the cathode, you shouldn't get but a minute bit of current d; /archives//html/Amps/2004-05/msg00242.html (7,992 bytes)
15. [Amps] Drake L-4 retrofit. (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Wed, 26 May 2004 20:17:29 -0400; Chuck, You can get those also from Newark Electronics (Best Price), Allied Electronics, or Mouser Electronics. I think they carry the Cornell Dubiler there at Newark which may be what they used origi; /archives//html/Amps/2004-05/msg00245.html (7,177 bytes)
16. [Amps] Power transformer website (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Wed, 26 May 2004 22:56:36 -0400; Ok, as promised, I done a website on designing power transformers. It does not include audio and impedance transformers however. I tried to make it as easy to understand in layman terms as possible.; /archives//html/Amps/2004-05/msg00247.html (6,574 bytes)
17. [Amps] Re: 4-400 Question - It's Grounded Grid! (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Fri, 28 May 2004 12:34:37 -0400; Bear, Sorry, I didn't know which amp was using this so I assumed it having screen voltage by it being a tetrode. Actually those resistors act as fuses which should open up in case or an arc or short; /archives//html/Amps/2004-05/msg00255.html (7,726 bytes)
18. [Amps] Transformer website update. (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Sun, 30 May 2004 19:41:41 -0400; I added a few more charts, made some corrections, figured out the quick formula for 50 Hz, and added an amateur radio transformer page. The example there shows designing a 1800 Vac @ 1.4 amp plate tr; /archives//html/Amps/2004-05/msg00271.html (6,930 bytes)
19. [Amps] rebuilding glass tubes (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Thu, 03 Jun 2004 14:01:39 -0400; Below are two links to companies rebuilding vacuum tubes. They will only rebuild down to a certain size due to cost. Econco: http://www.econco.com/index.html Kennetron: http://www.kennetron.com/ Will; /archives//html/Amps/2004-06/msg00010.html (7,113 bytes)
20. [Amps] Power supply filters (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Fri, 04 Jun 2004 00:22:23 -0400; Ok, Most know I'm working on the transformer website. A few have asked about chokes and filters by e-mail. How many would like to see something added about the filter networks and choke design? If th; /archives//html/Amps/2004-06/msg00013.html (6,989 bytes)

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