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Total 16 documents matching your query.

1. [AMPS] 4cx250* amp building plans (score: 1): Author: Chuck_Partain@Maxtor.com (Partain, Chuck); Date: Tue, 5 Jun 2001 05:22:16 -0700; Looked thru a LOT Of the archives and did not see, any references to plans for building a HF (not VHF) amp using a couple of 4cx250b's. I have one old ARRL circa 1975 set I am going off of now, did a; /archives//html/Amps/2001-06/msg00039.html (8,203 bytes)
2. [AMPS] 4cx250* amp building plans (score: 1): Author: 2@vc.net (2); Date: Tue, 5 Jun 2001 06:48:32 -0700; /\ I built a 2x 4cx250R SSB AB1 amplifier for 2m. I never drew a roadmap of the circuit I used because it was so simple that I had it in my head. If you would like to talk about it on the telephone,; /archives//html/Amps/2001-06/msg00042.html (8,969 bytes)
3. [AMPS] 4cx250* amp building plans (score: 1): Author: wd7s@ARRL.NET (Paul Hewitt); Date: Tue, 5 Jun 2001 08:57:05 -0700; The Bill Orr Handbook, sixteenth edition, describes a 10-20 meter cathode exited AB-1 amplifier using a pair of 4cx300a's. The twenty-first edition of the Bill Orr Handbook describes an 80-10 meter c; /archives//html/Amps/2001-06/msg00044.html (9,553 bytes)
4. [AMPS] 4cx250* amp building plans (score: 1): Author: 2@vc.net (2); Date: Wed, 6 Jun 2001 04:28:08 -0700; /\ A grid dissipation rating of 2w max. is not good news for g-g operation. With Class AB1 grid-driven operation, grid dissipation is 0w. later - R. L. Measures, 805.386.3734, www.vcnet.com/measures; /archives//html/Amps/2001-06/msg00046.html (8,547 bytes)
5. [AMPS] 4cx250* amp building plans (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 6 Jun 2001 12:32:54 +0100; We usually think of g-g as being AB2 with triodes or triode connected tetrodes/pentodes. Does it have to be? I've never seen an AB1 grounded grid design, but is there any reason why one couldn't driv; /archives//html/Amps/2001-06/msg00047.html (9,058 bytes)
6. [AMPS] 4cx250* amp building plans (score: 1): Author: 2@vc.net (2); Date: Wed, 6 Jun 2001 05:33:02 -0700; /\ no. the Collins 30S-1 is AB1 cathode driven. the /\ screen and bias supplies are a 'piece of cake' for 4cx250s. /\ except on higher freqs. The fly in the ointment with g-g is the more critical tu; /archives//html/Amps/2001-06/msg00048.html (9,390 bytes)
7. [AMPS] 4cx250* amp building plans (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 6 Jun 2001 13:25:11 +0100; "Grounded grid" gets a bad name because of the amateur practice of connecting both grids to chassis ground. As Rich says, the control grids of most modern tetrodes won't handle the excessive grid cur; /archives//html/Amps/2001-06/msg00049.html (10,055 bytes)
8. [AMPS] 4cx250* amp building plans (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 6 Jun 2001 13:36:06 +0100; /\ no. the Collins 30S-1 is AB1 cathode driven. I'd forgotten that one. Not sure you can really call it grounded grid, though, since the grid is grounded through 220pF so that feedback can be applied; /archives//html/Amps/2001-06/msg00050.html (8,768 bytes)
9. [AMPS] 4cx250* amp building plans (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 6 Jun 2001 13:48:46 +0100; It still fits into the broad classification of grounded grid. After all, when a grid-driven amp has a small amount of cathode resistance, we still call it grounded-cathode. Peter has an unfair advant; /archives//html/Amps/2001-06/msg00051.html (9,374 bytes)
10. [AMPS] 4cx250* amp building plans (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 6 Jun 2001 13:51:56 +0100; I bought copies of the 1946 and 1953 ARRL Handbooks at Dayton for my collection. G3XTT asked if I was looking to update the station equipment......actually, just the oeprator. 73 Peter G3RZP -- FAQ o; /archives//html/Amps/2001-06/msg00052.html (8,584 bytes)
11. [AMPS] 4cx250* amp building plans (score: 1): Author: wd7s@ARRL.NET (Paul Hewitt); Date: Wed, 6 Jun 2001 05:56:45 -0700; Thanks Ian I don't understand how the phrase "grounded grid" was somehow seen in my post. Both designs I referred to use normal voltages on the grid and screen and RF by-passing for both. Neither amp; /archives//html/Amps/2001-06/msg00053.html (8,630 bytes)
12. [AMPS] 4cx250* amp building plans (score: 1): Author: 2@vc.net (2); Date: Wed, 6 Jun 2001 07:44:15 -0700; /\ true, Peter, however the grid's RF potential is virtually 0v. cheers - R. L. Measures, 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amp; /archives//html/Amps/2001-06/msg00054.html (8,422 bytes)
13. [AMPS] 4cx250* amp building plans (score: 1): Author: nospam4me@juno.com (nospam4me@juno.com); Date: Wed, 6 Jun 2001 17:08:04 -0700; - Lots of related projects on the http://sonic.ucdavis.edu Amateur Radio Page. - In particular, have a look at the ARCOS amplifier projects and the pictures of actual built amps. - cheers skipp - pla; /archives//html/Amps/2001-06/msg00056.html (8,929 bytes)
14. [AMPS] 4cx250* amp building plans (score: 1): Author: na9d@speakeasy.net (Jon Ogden); Date: Thu, 07 Jun 2001 07:04:44 -0500; You're right, Rich. I think the temptation is to look at it and since it's not DC grounded, we don't (at least I don't) always see the AC ground right away. The term "grounded grid" while accurate ca; /archives//html/Amps/2001-06/msg00063.html (9,250 bytes)
15. [AMPS] 4cx250* amp building plans (score: 1): Author: PhilHSS@Breathemail.net (Phil); Date: Sat, 9 Jun 2001 12:08:31 +0100; Chuck, Your email started my grey matter churning - takes quite some doing! An amplifier fitting your requirements of two 4CX250B's on HF was detailed in the RSGB journal 'Radio Communication' in Sep; /archives//html/Amps/2001-06/msg00082.html (9,600 bytes)
16. [AMPS] 4cx250* amp building plans (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Sun, 10 Jun 2001 08:19:47 +0100; --Original Message-- From: Phil <PhilHSS@Breathemail.net> To: Partain, Chuck <Chuck_Partain@Maxtor.com>; Amps (E-mail) <amps@contesting.com> To: <amps@contesting.com> Date: 09 June 2001 12:23 Subject; /archives//html/Amps/2001-06/msg00088.html (8,859 bytes)

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