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Total 36 documents matching your query.

1. Re: [Amps] Henry 2K-4 Failure (score: 1)
Author: Adrian <vk4tux@gmail.com>
Date: Thu, 19 Mar 2020 08:09:23 +1000
Surely a meter, ohm checking the pin resistance between the cathode and grid will identify the problem tube ? Unless the short only occurs when hot. Adrian Fewster vk4tux I'll swap in a different set
/archives//html/Amps/2020-03/msg00076.html (8,198 bytes)

2. Re: [Amps] Henry 2K-4 Failure (score: 1)
Author: Adrian <vk4tux@gmail.com>
Date: Thu, 19 Mar 2020 09:04:52 +1000
Ok on that, a 500v megger check would probably show it better. Sent from AOL Mobile Mail Get the new AOL app: mail.mobile.aol.com <http://mail.mobile.aol.com> Surely a meter, ohm checking the pin res
/archives//html/Amps/2020-03/msg00078.html (8,373 bytes)

3. Re: [Amps] Henry 2K-4 Failure (score: 1)
Author: Adrian <vk4tux@gmail.com>
Date: Fri, 20 Mar 2020 08:17:51 +1000
Thanks Jim, you can't beat words from those experienced. I guess a cathode test plug could be made to substitute one tube plugging into the socket .A dead tube could have its base made up for this, w
/archives//html/Amps/2020-03/msg00082.html (8,137 bytes)

4. Re: [Amps] Henry 2K-4 Failure (score: 1)
Author: Adrian <vk4tux@gmail.com>
Date: Sat, 21 Mar 2020 00:50:24 +1000
Yes I earlier divided 10 volts by 15 amps to get 0.666 series resistance divided by 2  (tubes) 1.5 ft 16 gauge nichrome coiled is a inexpensive option. Jim   VE7RF Thanks Jim, you can't beat words fr
/archives//html/Amps/2020-03/msg00089.html (9,897 bytes)

5. Re: [Amps] DRAKE L4B (score: 1)
Author: Adrian <vk4tux@gmail.com>
Date: Wed, 29 Apr 2020 15:42:50 +1000
Like New ! Great work Robert. Adrian cleaning up L4B posted few photos at http://w5aj.eqth.net/drake/drake.htm Observations: The air cooling / fan is anemic The plastic fan & metal hub can be rejoine
/archives//html/Amps/2020-04/msg00026.html (7,848 bytes)

6. Re: [Amps] SB220 Meter blown (score: 1)
Author: Adrian <vk4tux@gmail.com>
Date: Sat, 16 May 2020 07:08:17 +1000
from ; http://www.somis.org/sb-220ci.html "6. Meter damage can be avoided by connecting two, ordinary = or >1A, any PIV, silicon rectifiers across the terminals on each meter. The two diode arrows sh
/archives//html/Amps/2020-05/msg00017.html (8,636 bytes)

7. Re: [Amps] SB220 Meter blown (score: 1)
Author: "Adrian" <vk4tux@gmail.com>
Date: Sat, 16 May 2020 13:43:48 +1000
Well the shunt diode both ways protection method certainly saved my sb-220 meter in the past, So I just don't believe you W7FRY. Good diodes should be checked after install, after any 'event' to chec
/archives//html/Amps/2020-05/msg00022.html (10,545 bytes)

8. Re: [Amps] SB220 Meter blown (score: 1)
Author: Adrian <vk4tux@gmail.com>
Date: Sat, 16 May 2020 22:17:34 +1000
I would rather follow Rich's advice on the subject as per my previous link. contained withjin ; "It may take more than one diode to protect a meter shunt resistor. A silicon diode begins to conduct a
/archives//html/Amps/2020-05/msg00025.html (11,127 bytes)

9. Re: [Amps] SB220 Meter blown (score: 1)
Author: Adrian <vk4tux@gmail.com>
Date: Sun, 17 May 2020 05:15:11 +1000
The diodes(s) should be direct across the meter, and enough in series as needed to excedd the full scale deflection voltage required before forward bias is achieved in the diodes. It's all very simpl
/archives//html/Amps/2020-05/msg00029.html (14,701 bytes)

10. Re: [Amps] SB220 Meter blown (score: 1)
Author: Adrian <vk4tux@gmail.com>
Date: Mon, 18 May 2020 19:41:38 +1000
The shunt resistor is across the meter to set the working range of application for the FSD corresponding to the full range of measurement. , that's why it is called a shunt resistor. The protection d
/archives//html/Amps/2020-05/msg00035.html (12,011 bytes)

11. Re: [Amps] SB220 Meter blown (score: 1)
Author: Adrian <vk4tux@gmail.com>
Date: Mon, 18 May 2020 20:03:44 +1000
The shunt resistor is across the meter to set the working range of application for the FSD corresponding to the full range of measurement. , that's why it is called a shunt resistor. The protection d
/archives//html/Amps/2020-05/msg00036.html (9,504 bytes)

12. Re: [Amps] SB-220 6M conversion (score: 1)
Author: Adrian <vk4tux@gmail.com>
Date: Sat, 6 Jun 2020 13:24:14 +1000
Have you seen this one Steve ?  ; 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 ta
/archives//html/Amps/2020-06/msg00012.html (9,499 bytes)

13. Re: [Amps] SPE-2K power supply issue (score: 1)
Author: Adrian <vk4tux@gmail.com>
Date: Thu, 16 Jul 2020 00:07:57 +1000
I have a 1.5K-FA SPE here. Great amp, however getting any tech info out of SPE is like getting blood out of a stone. There is a tech doc for the 1KFA which seems the only tech info ever released from
/archives//html/Amps/2020-07/msg00006.html (8,951 bytes)

14. Re: [Amps] SPE-2K power supply issue (score: 1)
Author: Adrian <vk4tux@gmail.com>
Date: Thu, 16 Jul 2020 00:52:16 +1000
You obviously have an overly pedantic Internet security system installed. duckdns is an Amazon free dns service. However I will remove the link, it's hard to help out these days... ..."Suspicious lin
/archives//html/Amps/2020-07/msg00007.html (7,469 bytes)

15. Re: [Amps] Alpha 87A Won't Transmit (score: 1)
Author: Adrian <vk4tux@gmail.com>
Date: Wed, 7 Apr 2021 23:36:35 +1000
Excessive load reflected power or RF voltage. May be caused by excessive load VSWR at an otherwise acceptable power (e.g. 4:1 at 1.5 kW) or excessive power at otherwise acceptable load VSWR (e.g. 2.5
/archives//html/Amps/2021-04/msg00016.html (6,904 bytes)

16. Re: [Amps] single phase into 3 phase transformer (score: 1)
Author: Adrian <vk4tux@gmail.com>
Date: Wed, 21 Apr 2021 17:55:00 +1000
I would be looking at something like this ; https://www.ebay.com.au/itm/233749951031?hash=item366c953237:g:8R8AAOSw4OJfvAb4 vk4tux 73 Bill wa4lav _______________________________________________ Amps
/archives//html/Amps/2021-04/msg00088.html (7,557 bytes)

17. Re: [Amps] Alpha 87A Power Supply Question (score: 1)
Author: Adrian <vk4tux@gmail.com>
Date: Thu, 6 May 2021 10:56:41 +1000
Although, I am a VK, , I am also an A class Electrician here, and here is how The SAA wiring rules relates to this matter for best safety, inline; On 6/5/21 10:01 am, MU 4CX250B wrote: Hi Jeff and Ji
/archives//html/Amps/2021-05/msg00024.html (12,190 bytes)

18. Re: [Amps] Alpha 87A Power Supply Question (score: 1)
Author: Adrian <vk4tux@gmail.com>
Date: Fri, 7 May 2021 09:34:25 +1000
It is dangerous, additional to my earlier post connecting neutral to chassis and wiring 120v returns to same terminal, if the neutral connection opens anywhere from within the amp back to the supply,
/archives//html/Amps/2021-05/msg00034.html (9,958 bytes)

19. Re: [Amps] 1N Diodes (score: 1)
Author: Adrian <vk4tux@gmail.com>
Date: Fri, 2 Jul 2021 08:30:36 +1000
RM, said it best with ; "Protection diodes should not be petite. Big, ugly diodes with a peak current rating of 200 A or more are best. I have seen smaller diodes - and the meter they were supposed t
/archives//html/Amps/2021-07/msg00014.html (8,820 bytes)

20. Re: [Amps] 1N Diodes (score: 1)
Author: Adrian <vk4tux@gmail.com>
Date: Fri, 2 Jul 2021 08:54:32 +1000
Factories Can get it wrong, Get Factories back to common sense instead of saving a few cents on production costs, for a more reliable amp. However there is money to be made in non-warranty repairs by
/archives//html/Amps/2021-07/msg00017.html (8,618 bytes)

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