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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+Drake\s+L\-4B\s+PSU\s+burned\s+resistor\s*$/: 11 ]

Total 11 documents matching your query.

1. [Amps] Drake L-4B PSU burned resistor (score: 1)
Author: Alan Ibbetson <alan@g3xaq.demon.co.uk>
Date: Mon, 31 Oct 2005 20:59:44 +0000
I recently got a Drake L-4B amplifier. I've been using (abusing) it a couple of weeks on CW on the high voltage SSB position. Pretty much everybody seems to do this. After all, it's only running 2500
/archives//html/Amps/2005-10/msg00730.html (7,520 bytes)

2. Re: [Amps] Drake L-4B PSU burned resistor (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 1 Nov 2005 00:52:37 -0800
The first things I would look at is the tubes, testing them for filament-grid breakdown potential. Next, I would measure the R of the VHF suppressor resistors. Filament-grid BD potential should be >6
/archives//html/Amps/2005-11/msg00000.html (8,958 bytes)

3. Re: [Amps] Drake L-4B PSU burned resistor (score: 1)
Author: Alan Ibbetson <alan@g3xaq.demon.co.uk>
Date: Tue, 1 Nov 2005 23:09:34 +0000
No hi-pot tester here, but seeing as the valves are somewhat low on emission I might invest in a pair of new ones on my trip to CA next week. They measure OK. The 10 or 14 watt ones commonly availabl
/archives//html/Amps/2005-11/msg00017.html (8,027 bytes)

4. Re: [Amps] Drake L-4B PSU burned resistor (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 1 Nov 2005 16:03:54 -0800
On Nov 1, 2005, at 3:09 PM, Alan Ibbetson wrote: In message <ac2be72401684c739d03a4198d0ddd80@somis.org>, R. Measures <r@somis.org> writes The first things I would look at is the tubes, testing them
/archives//html/Amps/2005-11/msg00021.html (9,690 bytes)

5. Re: [Amps] Drake L-4B PSU burned resistor (score: 1)
Author: Steve Thompson <g8gsq@ic24.net>
Date: Wed, 02 Nov 2005 12:54:45 +0000
Vishay do a 'bolt down' 50W resistor which lists: Dielectric strength 3500V rms Limiting ekement voltage 1285V rms Maximum overload voltage 2500V rms There's overload and pulse ratings in the data.
/archives//html/Amps/2005-11/msg00025.html (8,184 bytes)

6. Re: [Amps] Drake L-4B PSU burned resistor (score: 1)
Author: "Mark Marsden" <mm@plextek.co.uk>
Date: Wed, 2 Nov 2005 13:28:39 -0000
I use the 50R 100W version, it's pictured at the bottom right hand corner on http://granta.digital-crocus.com/linear/Mvc-049x.jpg 73, Mark G4AXX --Original Message-- Vishay do a 'bolt down' 50W resis
/archives//html/Amps/2005-11/msg00026.html (7,687 bytes)

7. Re: [Amps] Drake L-4B PSU burned resistor (score: 1)
Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 2 Nov 2005 14:15:41 +0000
The voltage rating on these components is a continuous rating. The green Welwyn 14W resistors will handle higher voltages for a short time in glitch resistor service. Three of these 10 or 15 ohm resi
/archives//html/Amps/2005-11/msg00027.html (9,210 bytes)

8. Re: [Amps] Drake L-4B PSU burned resistor (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 2 Nov 2005 06:30:53 -0800
Sounds adequate to me for typical Ham amps. However, my experience with bolt down resistors is that they act not unlike a double ended cannon during failure. Richard L. Measures, AG6K, 805.386.3734.
/archives//html/Amps/2005-11/msg00028.html (9,423 bytes)

9. Re: [Amps] Drake L-4B PSU burned resistor (score: 1)
Author: Steve Thompson <g8gsq@ic24.net>
Date: Wed, 02 Nov 2005 14:51:35 +0000
Yes, I've had that happen with the ones built into an extruded aluminium casing. The Vishay ones I was looking at are flat, with a moulded covering. I imagine that the resistive element is a film on
/archives//html/Amps/2005-11/msg00029.html (8,332 bytes)

10. Re: [Amps] Drake L-4B PSU burned resistor (score: 1)
Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 2 Nov 2005 15:46:36 +0000
The metal-clad resistors have a very poor voltage rating, either end-to-end or to ground, and they seem to get worse with heat and ageing. They are totally unsuitable as glitch resistors. Also they a
/archives//html/Amps/2005-11/msg00032.html (9,432 bytes)

11. Re: [Amps] Drake L-4B PSU burned resistor (score: 1)
Author: Jason Buchanan <jsb@digistar.com>
Date: Sun, 06 Nov 2005 09:56:36 -0500
That happened to me last year - caused by a bad tube. I sent the tubes to Rich Measures for his hipot service ;-) One of the tubes had a filament-grid BD potential of around 2000V (it should be 6000V
/archives//html/Amps/2005-11/msg00075.html (9,144 bytes)

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