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21. Re: [Amps] SB-220 6M conversion (score: 1)
Author: Artek Manuals <Manuals@ArtekManuals.com>
Date: Fri, 5 Jun 2020 23:45:42 -0400
About 65-70W to get 600W (no further increase at 80W) Dave NR1DX 73, Dick, W1KSZ I have enough HF amps here (four at last count) One of them is an ancient SB-220 , so I thought what the heck I would
/archives//html/Amps/2020-06/msg00015.html (10,301 bytes)

22. Re: [Amps] SB-220 6M conversion (score: 1)
Author: Artek Manuals <Manuals@ArtekManuals.com>
Date: Fri, 5 Jun 2020 23:46:04 -0400
About 65-70W to get 600W (no further increase at 80W) Dave NR1DX 73, Dick, W1KSZ I have enough HF amps here (four at last count) One of them is an ancient SB-220 , so I thought what the heck I would
/archives//html/Amps/2020-06/msg00016.html (10,081 bytes)

23. Re: [Amps] SB-220 6M conversion (score: 1)
Author: Artek Manuals <Manuals@ArtekManuals.com>
Date: Fri, 5 Jun 2020 23:46:22 -0400
Shack is dark ...will post pixs tomorrow The old "tune" cap is now the load cap The "new" tune cap measures 7-55pf and it is about 1/2 way meshed at resonance...getting a nice sharp dip in plate curr
/archives//html/Amps/2020-06/msg00017.html (11,266 bytes)

24. Re: [Amps] SB-220 6M conversion (score: 1)
Author: Artek Manuals <Manuals@ArtekManuals.com>
Date: Fri, 5 Jun 2020 23:46:43 -0400
YES I have that one. Dave NR1DX http://www.arrl.org/files/file/Technology/QST_Apr_2008_p38-40.pdf All done "physically" but try as I may I can not get more than about 600w out . 1) Two different tank
/archives//html/Amps/2020-06/msg00018.html (10,033 bytes)

25. Re: [Amps] SB-220 6M conversion (score: 1)
Author: Artek Manuals <Manuals@ArtekManuals.com>
Date: Fri, 5 Jun 2020 23:47:02 -0400
Agree in principle..QSK on 6M not that important Dave NR1DX Thanks 73 Jim W7RY http://www.arrl.org/files/file/Technology/QST_Apr_2008_p38-40.pdf All done "physically" but try as I may I can not get m
/archives//html/Amps/2020-06/msg00019.html (10,783 bytes)

26. Re: [Amps] SB-220 6M conversion (score: 1)
Author: Artek Manuals <Manuals@ArtekManuals.com>
Date: Sat, 6 Jun 2020 06:31:29 -0400
Roger 1)See Item #3 in original post !! 2) 3KV under load ??? 3) What are you using to measure power out ? 4)What did you use the to measure the plate voltage? The meter on SB220 or some other source
/archives//html/Amps/2020-06/msg00021.html (13,719 bytes)

27. Re: [Amps] SB-220 6M conversion (score: 1)
Author: Artek Manuals <Manuals@ArtekManuals.com>
Date: Sat, 6 Jun 2020 09:28:30 -0400
Running in the CW position just to be on the safe side ( after all this amp is nearly 40 years old) Going easy on the power transformer. I can only get about 100 more watts in SSB position Dave NR1DX
/archives//html/Amps/2020-06/msg00023.html (10,337 bytes)

28. Re: [Amps] SB-220 6M conversion (score: 1)
Author: Artek Manuals <Manuals@ArtekManuals.com>
Date: Sat, 6 Jun 2020 12:05:01 -0400
I have access to an "SB-226"  locally which I have studied it and measured the component values in detail ( nothing magical there) I dont have the same Plate tune cap (exactly) but I am very close I
/archives//html/Amps/2020-06/msg00025.html (10,665 bytes)

29. Re: [Amps] SB-220 6M conversion (score: 1)
Author: Artek Manuals <Manuals@ArtekManuals.com>
Date: Sat, 6 Jun 2020 13:19:04 -0400
Jim et All Replies interspaced below <Running in the CW position just to be on the safe side ( after all this <amp is nearly 40 years old) Going easy on the power transformer. I can <only get about 1
/archives//html/Amps/2020-06/msg00028.html (15,105 bytes)

30. Re: [Amps] SB-220 6M conversion Low RF Solved (score: 1)
Author: Artek Manuals <Manuals@ArtekManuals.com>
Date: Sat, 6 Jun 2020 18:12:53 -0400
In the end the biggest problem was grounds. As I said earlier this unit had not been stored in the best environment and apparently it took it's toll 1) Ran a separate ground strap between the two out
/archives//html/Amps/2020-06/msg00030.html (9,234 bytes)

31. Re: [Amps] Tl- 922 (score: 1)
Author: Artek Manuals <Manuals@ArtekManuals.com>
Date: Tue, 14 Jul 2020 21:18:01 -0400
R7 as in the resistor across D7? did you check to be sure D7 is not open? Dave NR1DX On 7/14/2020 6:06 PM, twobusyracing wrote: Kenwood tl-922, the amp burnt up the R7 resistor and pecked the ip amp
/archives//html/Amps/2020-07/msg00002.html (7,808 bytes)

32. Re: [Amps] Tl- 922 (score: 1)
Author: Artek Manuals <Manuals@ArtekManuals.com>
Date: Wed, 15 Jul 2020 03:52:26 -0400
Ahh I see now that there ( at least) three R7's on the schematic one on HV Rectifier Stack X43-1290-01 and one on the Meter Shunt board X54-1300-10 and one on the main chassis ! As a previous poster
/archives//html/Amps/2020-07/msg00004.html (9,479 bytes)

33. Re: [Amps] SB-221 Power Gain (score: 1)
Author: Artek Manuals <Manuals@ArtekManuals.com>
Date: Sat, 1 Aug 2020 05:48:23 -0400
Mike Numbers are in the ball park You might get up to 1200-1250 with a new pair of tubes . A pair of new 3-500ZG's is going to run you in the neighborhood of $450. The bigger issue on power out is yo
/archives//html/Amps/2020-08/msg00001.html (9,614 bytes)

34. Re: [Amps] FT8 power with the KPA1500 (score: 1)
Author: Artek Manuals <Manuals@ArtekManuals.com>
Date: Wed, 7 Jul 2021 17:56:58 -0400
Ron For starters the KPA1500 is spec'd at 1500W PEP 100% ICAS duty cycle modulation for FT8 and RTTY  ( page 8 of the manual) Max 5 minutes continuous key down ( 50 seconds on 50MHz) Unlike tube amps
/archives//html/Amps/2021-07/msg00028.html (13,620 bytes)

35. Re: [Amps] KPA1500 Efficiency vs. RF-Kit B26 (score: 1)
Author: Artek Manuals <Manuals@ArtekManuals.com>
Date: Tue, 13 Jul 2021 16:52:06 -0400
Yep ....same here with my KPA1500 though I rarely see temps over 70C (Im not as good a contester as K9YC) . 25000 QSO's in the first two years of ownership...I put the Alpha 9500 in the cabinet as a
/archives//html/Amps/2021-07/msg00051.html (8,497 bytes)

36. Re: [Amps] KPA1500 Efficiency vs. RF-Kit B26 (score: 1)
Author: Artek Manuals <Manuals@ArtekManuals.com>
Date: Tue, 13 Jul 2021 16:58:26 -0400
Jim N7CXI (too many Jim's) Now that is a valid point. I have been into the amp and there no thermocouples or sensors attached to the LDMOS ceramic or tabs for that matter One possible explanation  is
/archives//html/Amps/2021-07/msg00052.html (10,090 bytes)

37. Re: [Amps] TL-922A on 17 & 12 (score: 1)
Author: Artek Manuals <Manuals@ArtekManuals.com>
Date: Mon, 11 Oct 2021 22:55:18 -0400
Dick Before I retired it two years ago ( I need to sell it) my TL922A worked fine on 17 and 12. The Plate choke was replaced about 20 years ago with a "factory part" but I don't remember why. Except
/archives//html/Amps/2021-10/msg00049.html (7,975 bytes)

38. [Amps] Tokyo High Power HL350VDX fuses / confusion (score: 1)
Author: Artek Manuals <Manuals@ArtekManuals.com>
Date: Sat, 26 Mar 2022 22:22:18 -0400
A friend of mine recently acquired a Tokyo High Power HL350VDX /2M/ 300W amp Some things in manual  and in practice don't add up 1) The manual shows two 20 amp fuses, one in the positive line and one
/archives//html/Amps/2022-03/msg00083.html (7,761 bytes)

39. [Amps] RF-Kit RF2KS Service ? (score: 1)
Author: Artek Manuals <Manuals@ArtekManuals.com>
Date: Sun, 5 Jun 2022 09:22:16 -0400
Do they have someone set up to service the amp here in the states or does it have to be shipped back to the mother ship in Germany? Dave NR1DX And the answer as of June 2 was: Todays order will be de
/archives//html/Amps/2022-06/msg00034.html (8,083 bytes)

40. Re: [Amps] RF-Kit RF2KS Service ? (score: 1)
Author: Artek Manuals <Manuals@ArtekManuals.com>
Date: Sun, 5 Jun 2022 14:50:54 -0400
Doug / Walter Tnxs for the info. Never heard of these guys. Any anecdotal experience with them? Dave NR1DX _______________________________________________ Amps mailing list Amps@contesting.com http:/
/archives//html/Amps/2022-06/msg00051.html (7,702 bytes)

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