- 1. [Amps] Drake amplifier (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Mon, 23 Jul 2007 11:21:07 -0500
- I have a drake L7 amp. How much power out do you typically get from a drake L4 or L7 amp? I have 95 watts drive and get just short of 1100 watts on 40 meters. The amp's wattmeter and a bird wattmeter
- /archives//html/Amps/2007-07/msg00370.html (7,214 bytes)
- 2. Re: [Amps] Drake amplifier (score: 1)
- Author: Steve Katz <stevek@jmr.com>
- Date: Mon, 23 Jul 2007 09:11:57 -0700
- The low output is attributable to the low plate voltage. 3-500Zs are rated 400mA Ip per tube. A pair of them at 2450V (* 800mA) = 1960W input power. At 60% efficiency, which is about as high as it ca
- /archives//html/Amps/2007-07/msg00371.html (8,140 bytes)
- 3. Re: [Amps] Drake amplifier (score: 1)
- Author: Gudguyham@aol.com
- Date: Mon, 23 Jul 2007 12:33:14 EDT
- I have a drake L7 amp. How much power out do you typically get from a drake L4 or L7 amp? I have 95 watts drive and get just short of 1100 watts on 40 meters. The amp's wattmeter and a bird wattmeter
- /archives//html/Amps/2007-07/msg00372.html (8,419 bytes)
- 4. Re: [Amps] Drake amplifier (score: 1)
- Author: Gudguyham@aol.com
- Date: Mon, 23 Jul 2007 12:40:51 EDT
- But methinks that Ep is on the low side. I don't have an L-7, but could swear the L-4B Ep was more like 2.7 kV key-down...might be related to line voltage and which transformer tap you're using. -WB2
- /archives//html/Amps/2007-07/msg00373.html (7,470 bytes)
- 5. Re: [Amps] Drake amplifier (score: 1)
- Author: "jeremy-ca" <km1h@jeremy.mv.com>
- Date: Mon, 23 Jul 2007 14:55:45 -0400
- 1KW input on CW, 2KW PEP on SSB was the FCC reg back then. For that reason many amps of that era had a CW/SSB plate voltage switch. Many left it in the SSB position irregardless of the mode (; No sen
- /archives//html/Amps/2007-07/msg00374.html (9,887 bytes)
- 6. Re: [Amps] Drake amplifier (score: 1)
- Author: "Michael Tope" <W4EF@dellroy.com>
- Date: Mon, 23 Jul 2007 12:18:19 -0700
- That's about what I get out of mine, Gary. The Ep on the L-7 is too low to get legal limit. Mike W4EF.............................. _______________________________________________ Amps mailing list A
- /archives//html/Amps/2007-07/msg00375.html (7,870 bytes)
- 7. Re: [Amps] Drake amplifier (score: 1)
- Author: "Roger" <sub1@rogerhalstead.com>
- Date: Mon, 23 Jul 2007 15:59:48 -0400
- Maybe a slight technicality, but the power limit was "1 KW AVERAGE dc input measured using a current meter with a 1/4 aecond time constant. There was only one limit, not seperate ones for CW and SSB
- /archives//html/Amps/2007-07/msg00376.html (12,001 bytes)
- 8. Re: [Amps] Drake amplifier (score: 1)
- Author: "jeremy-ca" <km1h@jeremy.mv.com>
- Date: Mon, 23 Jul 2007 17:22:43 -0400
- Your slight technicality is a later revision to the regs, the FCC was having a problem defining the power so that advertising wording and tuning instructions didnt break rules. In 1963 1000W DC input
- /archives//html/Amps/2007-07/msg00379.html (14,956 bytes)
- 9. Re: [Amps] Drake amplifier (score: 1)
- Author: Gudguyham@aol.com
- Date: Mon, 23 Jul 2007 17:25:21 EDT
- How many out there drop the drive to their 8877 amp to 60-65W in order to be legal? Carl KM1H HUH? ** Get a sneak peek of the all-new AOL at http://discover.aol.com/memed/aolcom30tour _______________
- /archives//html/Amps/2007-07/msg00380.html (7,919 bytes)
- 10. Re: [Amps] Drake amplifier (score: 1)
- Author: "Mark Hill" <g4fph@mjha.co.uk>
- Date: Mon, 23 Jul 2007 22:26:33 +0100
- Gary, Mine does a fairly comfortable 1 kW out (with 100 W drive), with the stock Drake HV PSU (about 2.4 kV on load including the drop across the 50 Ohm 'glitch' resistor I added). Pity the designer(
- /archives//html/Amps/2007-07/msg00381.html (9,185 bytes)
- 11. Re: [Amps] Drake amplifier (score: 1)
- Author: Gudguyham@aol.com
- Date: Mon, 23 Jul 2007 17:37:42 EDT
- I imagine results might be influenced a little according to whether you have done the mod. to properly ground the valve grids, or not. I haven't yet, but soon will and will take a few 'before' and 'a
- /archives//html/Amps/2007-07/msg00383.html (7,868 bytes)
- 12. Re: [Amps] Drake amplifier (score: 1)
- Author: "jeremy-ca" <km1h@jeremy.mv.com>
- Date: Mon, 23 Jul 2007 18:06:02 -0400
- Lou, it will be a miracle if a tube survives a flashover without the grid "fuse" or a healthy surge resistor. Carl KM1H _______________________________________________ Amps mailing list Amps@contesti
- /archives//html/Amps/2007-07/msg00384.html (9,224 bytes)
- 13. Re: [Amps] Drake amplifier (score: 1)
- Author: "Roger" <sub1@rogerhalstead.com>
- Date: Mon, 23 Jul 2007 18:10:01 -0400
- I think I still have one of the Drake plug in "compressors". An amp with ONLY one 8877? <:-)) 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com ht
- /archives//html/Amps/2007-07/msg00385.html (15,268 bytes)
- 14. Re: [Amps] Drake amplifier (score: 1)
- Author: Gudguyham@aol.com
- Date: Mon, 23 Jul 2007 19:42:44 EDT
- it will be a miracle if a tube survives a flashover without the grid "fuse" or a healthy surge resistor. I saw very little difference in keeping an Sb-220 "stock" and grounding the girds. I don't thi
- /archives//html/Amps/2007-07/msg00388.html (8,214 bytes)
- 15. Re: [Amps] Drake amplifier (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Mon, 23 Jul 2007 18:51:00 -0500
- Back then I think very few understood what PEP was. Still today many don't. In the 1962 (16th edition) Bill Orr radio handbook they have an 813 amplifier project article. It is described as providing
- /archives//html/Amps/2007-07/msg00389.html (18,589 bytes)
- 16. Re: [Amps] Drake amplifier (score: 1)
- Author: "shack" <noddy1211@sbcglobal.net>
- Date: Mon, 23 Jul 2007 17:49:20 -0700
- More to the point is how many people have an accurate PEP watt meter that they can actually tell if they are legal. With 65 watts of drive on 17 meters my 8877 puts out 1725 watts. So, I would be car
- /archives//html/Amps/2007-07/msg00391.html (9,015 bytes)
- 17. Re: [Amps] Drake amplifier (score: 1)
- Author: "shack" <noddy1211@sbcglobal.net>
- Date: Mon, 23 Jul 2007 17:52:01 -0700
- Most CB'ers would laugh at only one 8877 --Original Message-- Comdel. I think I still have one of the Drake plug in "compressors". and no amp An amp with ONLY one 8877? <:-)) 73 Roger (K8RI) was you
- /archives//html/Amps/2007-07/msg00392.html (15,882 bytes)
- 18. Re: [Amps] Drake amplifier (score: 1)
- Author: "Robert Bonner" <rbonner@qro.com>
- Date: Mon, 23 Jul 2007 20:01:28 -0500
- GUYS, THE ONLY THING IMPORTANT IS HOW THE FCC READS the 1500 watts PEP limit. They hook THEIR peak reading Bird 43 Wattmeter up to your tailpipe and start whistling... If it goes over 1500W they writ
- /archives//html/Amps/2007-07/msg00395.html (20,562 bytes)
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