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Total 21 documents matching your query.

1. [Amps] PSU design question (score: 1)
Author: Ulf Tjerneld <star@frizon.org>
Date: Fri, 6 Nov 2009 19:47:58 +0100
Hi all, There is one thing I still haven't been able to understand; It is the question about having B- a little bit above ground. I have now read tons of info on the subject and I do get the basic id
/archives//html/Amps/2009-11/msg00084.html (8,051 bytes)

2. Re: [Amps] PSU design question (score: 1)
Author: "Steve Katz" <stevek@jmr.com>
Date: Fri, 6 Nov 2009 10:55:08 -0800
It's to allow metering in the return lead (close to ground potential) instead of in the B+ lead (where high voltage may have to be brought to a panel meter, etc). I usually float the HV return just s
/archives//html/Amps/2009-11/msg00085.html (8,652 bytes)

3. Re: [Amps] PSU design question (score: 1)
Author: "pc5m, Carel" <pc5m@xs4all.nl>
Date: Fri, 6 Nov 2009 20:04:38 +0100
Ulf, If you use a small valued resistor for the sake of measuring grid current in a triode grounded grid configuration and as such make sure the voltage drop over that resistor is smaller as 0.5V und
/archives//html/Amps/2009-11/msg00086.html (9,816 bytes)

4. Re: [Amps] PSU design question (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Fri, 06 Nov 2009 19:09:59 -0800
ORIGINAL MESSAGE: REPLY: I'll give it a try. The value of the resistor in the B- supply depends entirely on the type of meter you use for the cathode current. There are several types. Probably the mo
/archives//html/Amps/2009-11/msg00095.html (11,230 bytes)

5. Re: [Amps] PSU design question (score: 1)
Author: "David H Craig" <davidhcraig@verizon.net>
Date: Sat, 07 Nov 2009 00:07:22 -0500
This one is interesting to me for a number of reasons, not the least of which I spent a lot of time mulling over the different designs. In the end I do as Bill wrote below, using an ammeter with the
/archives//html/Amps/2009-11/msg00096.html (14,453 bytes)

6. Re: [Amps] PSU design question (score: 1)
Author: "alexeban" <alexeban@gmail.com>
Date: Sat, 7 Nov 2009 07:55:38 +0200
Actually it's simple: you measure the voltage drop of the plate current through that resistor. If the current is in the hundreds of mA range all you need is a couple of ohms to get a few hundreds of
/archives//html/Amps/2009-11/msg00097.html (9,366 bytes)

7. Re: [Amps] PSU design question (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Sat, 07 Nov 2009 02:41:26 -0500
Why? It's DC. Wouldn't one diode should suffice? We used two of opposite polarity in parallel with AC at work. 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@
/archives//html/Amps/2009-11/msg00098.html (7,711 bytes)

8. Re: [Amps] PSU design question (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sat, 07 Nov 2009 00:39:30 -0800
ORIGINAL MESSAGE: REPLY: A long time ago I thought that too - that one diode would be sufficient. But then someone posted a bizarre scenario involving a broken ground wire and some other condition (I
/archives//html/Amps/2009-11/msg00099.html (8,105 bytes)

9. Re: [Amps] PSU design question (score: 1)
Author: Ron Youvan <ka4inm@tampabay.rr.com>
Date: Sat, 07 Nov 2009 12:46:14 +0000
I have never seen this and I do not understand a reason for this practice with one exception, that being where a tube element is grounded and that element needs monitored and protected, such as a kl
/archives//html/Amps/2009-11/msg00100.html (8,658 bytes)

10. Re: [Amps] PSU design question (score: 1)
Author: "Carl" <km1h@jeremy.mv.com>
Date: Sat, 7 Nov 2009 09:10:12 -0500
Google is still your best friend. One has to be into VHF/UHF to know about Steve's products. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lis
/archives//html/Amps/2009-11/msg00101.html (9,541 bytes)

11. Re: [Amps] PSU design question (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Sat, 07 Nov 2009 10:02:56 -0500
I have a link to his site on my page. What I haven't figured out is why the 6-meter amp is export only when it's a legal limit amp with the same tubes as the other amps unless it hasn't been approved
/archives//html/Amps/2009-11/msg00102.html (10,517 bytes)

12. Re: [Amps] PSU design question (score: 1)
Author: "Carl" <km1h@jeremy.mv.com>
Date: Sat, 7 Nov 2009 11:25:24 -0500
Getting 6M type acceptance is expensive and Steve doesnt sell that many anyway to justify. I just got thru converting a LK-800C to 6M. It uses three 3CPX800's and with 150W drive and 3KV Ep it sure m
/archives//html/Amps/2009-11/msg00104.html (11,928 bytes)

13. [Amps] PSU design question (score: 1)
Author: Ulf Tjerneld <star@frizon.org>
Date: Sat, 7 Nov 2009 17:28:31 +0100
Hi all, Thank you for all great replies to my question! I understand now it is enough with only a couple of ohms for the B- to chassis resistor. However, contrary to this I came across a couple of ar
/archives//html/Amps/2009-11/msg00105.html (8,873 bytes)

14. Re: [Amps] PSU design question (score: 1)
Author: Dan <n5ar@air-pipe.com>
Date: Sat, 07 Nov 2009 08:56:39 -0800
Ulf. you connect a resistor in series with the meter not in shunt with it. The resistor is a value which will give the correct meter deflection for the plate current. 73, Dan, N5AR __________________
/archives//html/Amps/2009-11/msg00106.html (9,701 bytes)

15. Re: [Amps] PSU design question (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sat, 7 Nov 2009 17:20:04 +0000
My pleasure :-) Metering circuits were outside the scope of the Radcom series, which was only about HV power supplies. My approach to metering is fully explained in the Triode Board User Manual: http
/archives//html/Amps/2009-11/msg00107.html (11,161 bytes)

16. Re: [Amps] PSU design question (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Sat, 07 Nov 2009 15:20:48 -0500
What do they do, send them to a certified and independent lab that runs the tests with calibrated equipment? That should only run a few thousand dollars so it must be something more than just intermo
/archives//html/Amps/2009-11/msg00108.html (9,721 bytes)

17. Re: [Amps] PSU design question (score: 1)
Author: Craig <vk3he@yahoo.com>
Date: Sat, 7 Nov 2009 12:21:13 -0800 (PST)
Hi Ian What is "safe" practice in a grounded screen tetrode amplifier where the requirement is that the power supply negative rail is left "floating" ? It always makes me nervous poking around a grou
/archives//html/Amps/2009-11/msg00109.html (12,949 bytes)

18. Re: [Amps] PSU design question (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sat, 07 Nov 2009 15:00:31 -0800
ORIGINAL MESSAGE: REPLY: Your logic is correct. To have a 100 ohm "backup" for three large diodes is silly. In my 50+ years of electronics I have never seen a silicon diode fail in the open circuit m
/archives//html/Amps/2009-11/msg00111.html (9,203 bytes)

19. Re: [Amps] PSU design question (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sat, 7 Nov 2009 23:01:08 +0000
Me too. I don't think there is any wonderfully safe way, as all three power supplies - HV, grid and screen - are only connected to chassis through the G2+ connection. In particular it needs a fully f
/archives//html/Amps/2009-11/msg00112.html (9,550 bytes)

20. Re: [Amps] PSU design question (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sat, 07 Nov 2009 15:06:13 -0800
ORIGINAL MESSAGE: REPLY: Sorry, but I have to disagree with this design philosophy. If you are going to add another part as a "backup", add another large diode. A 100 ohm resistor of modest size coul
/archives//html/Amps/2009-11/msg00113.html (8,928 bytes)

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