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Total 25 documents matching your query.

1. Re: [Amps] SB220 on 120V (score: 1)
Author: Warren Volz <warren@warrenvolz.com>
Date: Mon, 4 Apr 2016 23:51:28 -0600
Hey Dick, I had this exact same question recently. There is a thread on QRZ about this: https://forums.qrz.com/index.php?threads/sb-220-breakers.515904 Long story short, at 120VAC each breaker feeds
/archives//html/Amps/2016-04/msg00002.html (8,108 bytes)

2. [Amps] SB220 QSK and Vacuum relay mounting (score: 1)
Author: Warren Volz <warren@warrenvolz.com>
Date: Thu, 15 Sep 2016 22:55:12 -0600
Ive got a SB220 thats been on the bench since last year. Its nearing completion but I have a few remaining items left. One of the last is finding a place for the W7RY QSK board and a pair of vacuum r
/archives//html/Amps/2016-09/msg00069.html (7,309 bytes)

3. Re: [Amps] SB220 QSK bias and RF relay mounting (score: 1)
Author: Warren Volz <warren@warrenvolz.com>
Date: Wed, 21 Sep 2016 17:44:14 -0600
Louis Gary and John, Thanks for your words of wisdom. Your responses have helped put me on the right track. Now if I can only get over drilling holes in the chassis Below is a link to a photo of wher
/archives//html/Amps/2016-09/msg00105.html (9,810 bytes)

4. Re: [Amps] new SS amps at dayton (score: 1)
Author: warren@warrenvolz.com
Date: Fri, 28 Apr 2017 11:15:28 -0600
Interestingly he does work on several classics such as the SB-220. -Warren KD5YPH _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mai
/archives//html/Amps/2017-04/msg00387.html (12,593 bytes)

5. [Amps] SB220 step start blows fuses (score: 1)
Author: Warren Volz <warren@warrenvolz.com>
Date: Sun, 25 Jun 2017 23:54:00 -0600
All, Ive been restoring a SB220 and finally got to the testing stage this weekend. When I turned it on, the HV went up to ~1kV and then started to drop. Successive cycles of the power switch did noth
/archives//html/Amps/2017-06/msg00272.html (6,817 bytes)

6. Re: [Amps] SB220 step start blows fuses (score: 1)
Author: Warren Volz <warren@warrenvolz.com>
Date: Tue, 4 Jul 2017 15:30:58 -0600
Thank you for the replies. I had some time to circle back to this today and checked a few things. - With the tubes removed, it looks like they have no shorts but the grids measure ~0 ohms (maybe its
/archives//html/Amps/2017-07/msg00000.html (8,893 bytes)

7. Re: [Amps] SB220 step start blows fuses (score: 1)
Author: Warren Volz <warren@warrenvolz.com>
Date: Tue, 4 Jul 2017 15:58:43 -0600
Ron, Thanks for the reply! Correct, they are zero Ohm (after the meter settles) in any direction. When I had the fuses blow the meter lights did not turn on, but I cant comment on the filaments. I wa
/archives//html/Amps/2017-07/msg00002.html (9,691 bytes)

8. Re: [Amps] SB220 step start blows fuses (score: 1)
Author: Warren Volz <warren@warrenvolz.com>
Date: Wed, 5 Jul 2017 00:06:44 -0600
What about any large inrush of current through the on/off switch? -Warren _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/lis
/archives//html/Amps/2017-07/msg00006.html (12,892 bytes)

9. Re: [Amps] SB220 step start blows fuses (score: 1)
Author: Warren Volz <warren@warrenvolz.com>
Date: Thu, 6 Jul 2017 00:07:50 -0600
Thank you for the flood of good suggestions. I'm getting closer. Without tubes and with the HV transformer unplugged, the fan and meter lights work. In addition, the step-start fuses dont blow! That
/archives//html/Amps/2017-07/msg00017.html (8,671 bytes)

10. Re: [Amps] SB220 step start blows fuses (score: 1)
Author: warren@warrenvolz.com
Date: Thu, 06 Jul 2017 10:55:41 -0600
And I keep leaving out important details... Due to the current wiring in my shack and a desire to test I'm running this on 120v. I know this is not the best idea long term, but it does allow me to te
/archives//html/Amps/2017-07/msg00019.html (10,353 bytes)

11. Re: [Amps] SB220 step start blows fuses (score: 1)
Author: Warren Volz <warren@warrenvolz.com>
Date: Sun, 9 Jul 2017 20:52:40 -0600
I may shortly be looking to purchase a variac. After building a dim bulb tester this weekend I have a minor update. With 120V connected, the HV primary disconnected and one tube in a socket (doesnt m
/archives//html/Amps/2017-07/msg00038.html (11,548 bytes)

12. Re: [Amps] SB220 step start blows fuses (score: 1)
Author: Warren Volz <warren@warrenvolz.com>
Date: Tue, 11 Jul 2017 18:35:19 -0600
Again thank you all for the advice and guidance. Replacement fuses showed up today so I'm being a little more adventurous. As multiple people pointed out the dim bulb tester I have as built won't wor
/archives//html/Amps/2017-07/msg00060.html (10,608 bytes)

13. Re: [Amps] SB220 step start blows fuses (score: 1)
Author: Warren Volz <warren@warrenvolz.com>
Date: Wed, 12 Jul 2017 00:40:52 -0600
Well I have a major update! The amp shipped with 2 3-500zs that are not full output according to the seller. Since the amp was in shambles I didnt have a way to test them until now. One of the 3-500z
/archives//html/Amps/2017-07/msg00063.html (11,239 bytes)

14. [Amps] Machlett 3-500z (score: 1)
Author: Warren Volz <warren@warrenvolz.com>
Date: Thu, 20 Jul 2017 20:46:59 -0600
Tonight while searching for 3-500z on eBay I discovered this listing: https://www.ebay.com/itm/222576972694 I know all 'new' tubes are made in China and the rfparts version seems to get the best revi
/archives//html/Amps/2017-07/msg00071.html (6,557 bytes)

15. [Amps] SB-220 no output (score: 1)
Author: Warren Volz <warren@warrenvolz.com>
Date: Tue, 25 Jul 2017 00:59:54 -0600
All, I ran into another hurdle with the SB-220 and am hoping someone has some wisdom. If I run RF through the AMP without power applied the relative power meter works and I can match my dummy load wi
/archives//html/Amps/2017-07/msg00102.html (7,266 bytes)

16. Re: [Amps] SB-220 no output (score: 1)
Author: Warren Volz <warren@warrenvolz.com>
Date: Tue, 25 Jul 2017 12:29:59 -0600
Ah! Yes ok, so it's only to give you a general idea on the power not actual numbers. That explains it. -Warren _______________________________________________ Amps mailing list Amps@contesting.com ht
/archives//html/Amps/2017-07/msg00104.html (8,727 bytes)

17. Re: [Amps] SB220 step start blows fuses (score: 1)
Author: Warren Volz <warren@warrenvolz.com>
Date: Mon, 18 Sep 2017 12:51:28 -0600
Just to close this out, as various people suspected the QSK circuit was broken. I ended up replacing 4 components (Q7, Q6, Q4, U1) on the W7RY QSK board and now the amp is working. I believe that a H
/archives//html/Amps/2017-09/msg00059.html (9,592 bytes)

18. [Amps] 3-500z plate color discrepancy (score: 1)
Author: Warren Volz <warren@warrenvolz.com>
Date: Thu, 12 Oct 2017 12:37:19 -0600
All, Thanks to the list I now have 2 "good" tubes in my rebuilt SB-220. Last night I was running some tests in tune mode and noticed that only one of the plates is turning red. This is with 5W from t
/archives//html/Amps/2017-10/msg00125.html (6,572 bytes)

19. [Amps] SB220 plate meter question (score: 1)
Author: Warren Volz <warren@warrenvolz.com>
Date: Tue, 07 Nov 2017 01:41:04 -0700
All, My SB-220 is sick again. The plate meter works fine after start up but then ~15-20 minutes later it starts to show lower and lower values. Eventually it doesn't show any plate current, but the a
/archives//html/Amps/2017-11/msg00038.html (6,495 bytes)

20. Re: [Amps] Easy question. (score: 1)
Author: Warren Volz <warren@warrenvolz.com>
Date: Wed, 8 Nov 2017 16:27:12 -0700
I think the revised handbook has a schematic for a gi7b amp. Usual sources are eBay, http://www.ur4ll.net/, rfparts, etc. Im sure others have their favorites. -Warren KD5YPH _________________________
/archives//html/Amps/2017-11/msg00083.html (7,263 bytes)

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