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1. [Amps] Drake L4B to 6 Meters (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Wed, 14 Sep 2016 14:21:22 -0400; Hi Group, Looking for information on converting L4B to 6 meters, Thanks. 73s Michelle WB8QGR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contest; /archives//html/Amps/2016-09/msg00051.html (6,736 bytes)
2. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Mon, 12 Dec 2016 10:01:33 -0500; Hi Group, I have converted a Drake L4B to 6 meters and I seem to be stuck at 750 watts output, I have tried a PI input (no change) , different tank coils (less output), The current setup listed below; /archives//html/Amps/2016-12/msg00297.html (8,053 bytes)
3. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Mon, 12 Dec 2016 11:24:19 -0500; You are not missing anything, it sounds as if you have it all done just about right. 750W for 2300V/0.65A Efficiency right around 50%, gain 8dB It's exactly what I would have said to expect from a co; /archives//html/Amps/2016-12/msg00303.html (8,141 bytes)
4. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Mon, 12 Dec 2016 11:56:02 -0500; You are not missing anything. An L4B converted to 6M will be something around 50% efficient because the components used have not been optimized for that band. If your 750W output is key down you will; /archives//html/Amps/2016-12/msg00306.html (7,718 bytes)
5. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Mon, 12 Dec 2016 12:42:55 -0500; OK-you did not say that you had rebuilt the PA and removed all the old parts. Many conversions do not use the proper filament choke, proper by-passing at the plate choke and filament choke, proper pl; /archives//html/Amps/2016-12/msg00309.html (8,571 bytes)
6. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Mon, 12 Dec 2016 13:05:34 -0500; Is it biased class "C" for CW usage on 6 meters? If so it should do a bit better that 65% efficiency. A pair of 3-500Z's can produce over a kilowatt if it has the plate power that supports it. (norma; /archives//html/Amps/2016-12/msg00310.html (9,148 bytes)
7. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Mon, 12 Dec 2016 13:36:01 -0500; I have converted an SB220 and a TL922 for 6M. Both will produce 1300W PEP 6M. ( FYI I have converted an SB200 and that gave 600W PEP) A stock L4-B will easily produce 1KW PEP on 10m and should do the; /archives//html/Amps/2016-12/msg00315.html (10,320 bytes)
8. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Mon, 12 Dec 2016 13:47:54 -0500; Guess I missed that List! Old age....I don't read as clearly as I once did! You noted in another post that you had biased the tubes for zero idling current?? If so, FYI my AL-82 runs about 150 ma on; /archives//html/Amps/2016-12/msg00316.html (9,326 bytes)
9. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Mon, 12 Dec 2016 13:58:37 -0500; Jim, current is way too high. 220-230 ma. You can knock the idle current down to 100 ma, when on high B+ position, with just 8 x diodes in the CT. Which will also result in 40 ma when on low B+ posit; /archives//html/Amps/2016-12/msg00318.html (9,580 bytes)
10. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Mon, 12 Dec 2016 17:06:08 -0500; Jim, Is it biased class "C" for CW usage on 6 meters? If so it should do a bit better that 65% efficiency. No, Amp is for SSB use only, No CW<< What condition are the 3-500Z's? Tubes are new from RF; /archives//html/Amps/2016-12/msg00328.html (9,417 bytes)
11. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Mon, 12 Dec 2016 17:16:04 -0500; Mike, I saw this on Eham.com for sale.SB 220 converted to 6 meters only as per QST April 08 minus vacuum variable 900 watt output. with paperwork, very nice. taking offers, pickup only zip Michelle _; /archives//html/Amps/2016-12/msg00329.html (9,564 bytes)
12. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Mon, 12 Dec 2016 19:25:32 -0500; When an amp is converted for mono band usage, you can forget about what the original MFG'ers rating on the amp was. since he kept referring to CW<<<< Michelle ________________________________________; /archives//html/Amps/2016-12/msg00331.html (8,605 bytes)
13. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Mon, 12 Dec 2016 19:53:00 -0500; If hams have been running Drake L4 and L4B amps since the early 70's or perhaps before with the L4 at zero bias, why all of a sudden you want to idle the thing down just because it is for 6 meters? T; /archives//html/Amps/2016-12/msg00332.html (9,744 bytes)
14. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Mon, 12 Dec 2016 23:59:24 -0500; Michelle Did you say that you are running the 2 tubes a zero bias and have about 100mA idle current. I think it should be more like 200mA in the SSB position. This would suggest that either your high; /archives//html/Amps/2016-12/msg00341.html (9,638 bytes)
15. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Tue, 13 Dec 2016 21:54:05 -0500; Ok, Here's where I am at: Removed zener from the self cut off bias mod, Idle current now 200 ma. Plate voltage 2300 under load (SSB mode) Plate current .810 (was 650) Grid 230 (was 220) Drive 100 wat; /archives//html/Amps/2016-12/msg00356.html (8,941 bytes)
16. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Thu, 15 Dec 2016 12:43:28 -0500; Here's the results from my modified SB220 Plate voltage 2500V under load (SSB mode) Plate current .75A Grid 230mA Drive 75 watts Output 1100 watts (key down, not pep) Voltage and current readings ar; /archives//html/Amps/2016-12/msg00378.html (9,104 bytes)

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