- 1. [Amps] 0.82 Ohm Again (score: 1)
- Author: "John Finner" <finnerjf@worldnet.att.net>
- Date: Sat, 18 Dec 2004 19:13:38 -0500
- I inherited an SB-221 from the estate of my best friend K4IPV. It was DOA with the R3 0.82 ohm grid shunt open. Joe had told me a number of years ago that it had died and he never got around to troub
- /archives//html/Amps/2004-12/msg00234.html (8,452 bytes)
- 2. [Amps] Ref: 4- 6AG7 Linear (score: 1)
- Author: "John Finner" <finnerjf@worldnet.att.net>
- Date: Tue, 28 Dec 2004 09:54:53 -0500
- Being school boy poor, I built mine with 4 6CL6's in the late 50's from a late 50's CQ article. A GE rep told me the 6CL6 was a glass version of the 6AG7 with a tab less anode dissapation. Only had 6
- /archives//html/Amps/2004-12/msg00366.html (7,513 bytes)
- 3. Re: [Amps] Small Amplifier (score: 1)
- Author: "John Finner" <finnerjf@worldnet.att.net>
- Date: Fri, 14 Jan 2005 18:16:13 -0500
- David If you have a supply of each, availability and replacement aren't an issue. If you stay within the Eimac class AB1 specifications (which none of us ever exceed,right?), two 4CX300's will take 2
- /archives//html/Amps/2005-01/msg00263.html (7,241 bytes)
- 4. Re: [Amps] qrp-excited amps (score: 1)
- Author: "John Finner" <finnerjf@worldnet.att.net>
- Date: Sat, 15 Jan 2005 13:28:36 -0500
- John The only amplifier from my several Orr handbooks that you might be thinking of is from the 21st edition. It is a class AB1 passive grid driven configuration 4CX1500. What lends it to your qrp le
- /archives//html/Amps/2005-01/msg00280.html (8,758 bytes)
- 5. [Amps] Fw: Another Plate Transformer Question (score: 1)
- Author: "John Finner" <finnerjf@worldnet.att.net>
- Date: Thu, 5 May 2005 20:52:14 -0400
- Don And The Master 23rd edition Thordarson section says: T-21P83 1560-0-1560 1250-0-1250 @ 200 ma DC Pri 117 V 50/60 cps (I know, I know) Secondary voltage changed by primary tap. Static shield. Size
- /archives//html/Amps/2005-05/msg00097.html (8,083 bytes)
- 6. [Amps] Fw: Another Plate Transformer Question (score: 1)
- Author: "John Finner" <finnerjf@worldnet.att.net>
- Date: Sat, 7 May 2005 09:02:07 -0400
- Bill and Don The dimensions are overall. Its mounting type is listed as Thordarson type PUV, which is probably pictured in any of their catalogs. It appears to have two cast end bells with porcelain
- /archives//html/Amps/2005-05/msg00128.html (12,526 bytes)
- 7. Re: [Amps] Pair of 4CX250s on 6-meters (score: 1)
- Author: "John Finner" <finnerjf@worldnet.att.net>
- Date: Thu, 12 May 2005 05:39:37 -0400
- Dino I built a 6 meter 2 4CX250B amplifier using the Ed Tilton W1HDQ design found in the February 1964 QST, The VHF Handbook (ARRL) and reprint pdf's on the web. I used 2 tubes where W1HDQ used 3. Tu
- /archives//html/Amps/2005-05/msg00163.html (10,129 bytes)
- 8. Re: [Amps] 220V wiring: Was Question about safety ground (score: 1)
- Author: "John Finner" <finnerjf@worldnet.att.net>
- Date: Wed, 16 Nov 2005 18:55:59 -0500
- To describe the 220v power wiring used in my shack. I bought a Kenmore electric dryer in 1970. Since it came without a line cord, I also bought the Sears recommended cord. The 10/3 cord came equipped
- /archives//html/Amps/2005-11/msg00258.html (10,932 bytes)
- 9. Re: [Amps] Tube substitute in a Hallicrafters HT-41 (score: 1)
- Author: "John Finner" <finnerjf@worldnet.att.net>
- Date: Thu, 6 Nov 2008 21:11:42 -0500
- Going in a different direction, a pair of 4X150A/4CX25B's in 50 ohm passive grid AB1. Tubes are cheap and plentiful. Anode load impedance, anode supply voltage, filament voltage and bias voltage supp
- /archives//html/Amps/2008-11/msg00042.html (6,792 bytes)
- 10. Re: [Amps] 6 meter amp (score: 1)
- Author: "John Finner" <finnerjf@worldnet.att.net>
- Date: Tue, 23 Jun 2009 21:21:44 -0400
- good design? Thanks Mike Have a look at the Ed Tilton W1HDQ 6 meter 3 4CX250B amp in the June 1964 QST and copies on the web. I built mine with only 2 4CX25B's. John WA4EPI _________________________
- /archives//html/Amps/2009-06/msg00104.html (6,985 bytes)
- 11. Re: [Amps] EIMAC 4CX300A 8167 (score: 1)
- Author: "John Finner" <finnerjf@worldnet.att.net>
- Date: Fri, 24 Jul 2009 21:53:33 -0400
- Yes. I am biased since I have 7 tubes and am building a three tube 75 meter single band amp. Finding sockets was my biggest problem, but I am over that. Class AB1 passive grid driven grounded screen
- /archives//html/Amps/2009-07/msg00329.html (7,318 bytes)
- 12. [Amps] 4CX300a Seal Leaks (score: 1)
- Author: "John Finner" <finnerjf@worldnet.att.net>
- Date: Fri, 15 Jan 2010 21:08:42 -0500
- I read a post by Carl, KM1H on August 10, 2009 that read: There are several ceramic tubes that are notorious for seal leakage. The 4CX300A is a classic. This post is directed to Carl. The list might
- /archives//html/Amps/2010-01/msg00215.html (6,864 bytes)
- 13. Re: [Amps] 4CX300a Seal Leaks (score: 1)
- Author: "John Finner" <finnerjf@worldnet.att.net>
- Date: Sat, 16 Jan 2010 12:15:11 -0500
- Thanks Gerald. I did not think of hipotting them. I have both a 5200 V supply that I can variac control and a Tripplet 630 for indicating leakage. I will be safe with the high voltage as I learned my
- /archives//html/Amps/2010-01/msg00219.html (10,173 bytes)
- 14. Re: [Amps] 4CX300a Seal Leaks (score: 1)
- Author: "John Finner" <finnerjf@worldnet.att.net>
- Date: Sat, 16 Jan 2010 12:24:58 -0500
- Thanks Carl. I will take Geralds advice as I have both a 5200 V supply and a Tripplet 630. I received the tubes from a Navy MARS friend quite a while back who had big ideas for them and no sockets. I
- /archives//html/Amps/2010-01/msg00220.html (9,992 bytes)
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