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41. [Amps] water cooled 160m amp. (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Tue, 9 Feb 2010 18:16:07 -0800
That is the same efficiency as with a 8877 at that voltage. It will be much better at higher anode voltage. 73 Peter voltages applied ?? I can see gain going up a bit. I can also see more power out.
/archives//html/Amps/2010-02/msg00290.html (6,799 bytes)

42. [Amps] resistor before the cap redux (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Wed, 10 Feb 2010 05:24:20 -0800
I just ran a bunch of numbers on PSU designer and got quite different numbers than yours. I suspect it is because of the way measurements are being made. That is if I am doing things right here! Noti
/archives//html/Amps/2010-02/msg00293.html (9,677 bytes)

43. [Amps] Resistor before the B+ caps. (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Wed, 10 Feb 2010 05:55:01 -0800
Interesting comments, Jim. That's pretty cool software you're using. Thanks. toadd more diodes, stock, it's only good for 1 kv piv. Called duncan's powersupply modeler. Pse see my detailed responses
/archives//html/Amps/2010-02/msg00294.html (11,824 bytes)

44. [Amps] Resistor before the cap redux. (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Thu, 11 Feb 2010 04:24:45 -0800
since we would have to re-locate the smaller xfmr, and then kludge the wiring into place. Did you test using the Dahl transformer using the smaller AC wiring? with 100% predictable results. In other
/archives//html/Amps/2010-02/msg00307.html (9,908 bytes)

45. [Amps] Results from new PSUD... resistor b4 the B+ filter caps ! (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Thu, 11 Feb 2010 06:55:00 -0800
OK, Now that I have the latest version of psud... it just reafirms my real life test, done on a 3100 vdc real supply, using a 46 lb dahl xfmr.... and a 25 uf cap....... and a 22 ohm resistor BEFORE t
/archives//html/Amps/2010-02/msg00309.html (10,602 bytes)

46. [Amps] Resistor b4 the B+ filter /glitch/ notes. (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Thu, 11 Feb 2010 23:10:53 -0800
My question becomes, will this do anything to protect the tube(s) in case of a flash over? If the tube flashes over you still end up dumping all of the power in the caps into them. 73 Roger (K8RI) It
/archives//html/Amps/2010-02/msg00332.html (8,993 bytes)

47. [Amps] PSUD/ R b4 caps / step start / 6A10 diodes. (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Fri, 12 Feb 2010 06:56:58 -0800
I just looked at PSUD with a 25 ohm transformer, 2500 VAC and 25uf with 8 ohm esr filter cap. No resistor before filter. The surge current on the first half cycle is around 26 amps. Then peak current
/archives//html/Amps/2010-02/msg00343.html (9,702 bytes)

48. [Amps] Source for .2% Tol 100 K - 3 Watt MOF EQ resistor's (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Sat, 13 Feb 2010 05:21:06 -0800
Gents Well b4 Tony, W4ZE passed away, he gave me the mouser part # for superb 100 k 3 watt mof EQ resistor's, used across all my lytics in HV supplies. They are rated at 1 % Tol... and come 100 per b
/archives//html/Amps/2010-02/msg00367.html (8,062 bytes)

49. [Amps] 100k .2% tol eq resistor. (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Sat, 13 Feb 2010 18:02:13 -0800
Some have had difficulty finding this part in the mouser catalog. I plugged in the below... "Vishay CPF3100K00FHB14" into mousers own search box........ and it comes out right away. they have 150 in
/archives//html/Amps/2010-02/msg00377.html (6,763 bytes)

50. [Amps] Winding xfmr (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Mon, 15 Feb 2010 01:30:26 -0800
I wound one once....used the formulas from the ARRL handbook and from an old QST article. Low tech, but it worked just fine. The real "trick" is to get the primary right so it doesn't draw too much c
/archives//html/Amps/2010-02/msg00399.html (8,117 bytes)

51. [Amps] Tank eff... with more B+ (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Mon, 15 Feb 2010 02:07:34 -0800
Date: Tue, 9 Feb 2010 23:39:19 EST From: TexasRF@aol.com Subject: Re: [Amps] water cooled 160m amp. Jim, if you look art the curves for any of these tubes you will notice that the plate voltage swing
/archives//html/Amps/2010-02/msg00400.html (9,769 bytes)

52. [Amps] Tank eff.. with more B+ (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Tue, 16 Feb 2010 05:21:57 -0800
Hi Jim, I will rephrase a bit. I used peak power in the efficiency numbers and should have used rms power. My bad. Assuming the plate current is 1A for both examples, low power would generate 2200w
/archives//html/Amps/2010-02/msg00432.html (9,853 bytes)

53. [Amps] GU74B..aka "4cx-800A" (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Tue, 16 Feb 2010 05:40:56 -0800
or get rid of the amp. Still, maybe buying up the 50 year old designed GU74B, would be an excellent investment ? Sorta like the stock market crash in reverse ! Just think of it, double your money [ t
/archives//html/Amps/2010-02/msg00433.html (7,790 bytes)

54. [Amps] 4CX-3000/5000 (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Tue, 16 Feb 2010 06:09:52 -0800
4CX3000A filament 9.0VAC @ 41.5A = 373.5 Watts 4CX5000A filament 7.5VAC @ 75A = 562.5 Watts Yah, but I hate to use more electricity to light the fire in the final than for all the rest of my station.
/archives//html/Amps/2010-02/msg00435.html (8,515 bytes)

55. [Amps] L4PS Xfmr buzz (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Tue, 16 Feb 2010 06:23:43 -0800
I just installed the Harbach PM-400 in the L-4PS power supply for one of my Drake L-7 amps after I popped a rectifier diode in the old bridge: http://www.harbachelectronics.com/main/page_products_dra
/archives//html/Amps/2010-02/msg00436.html (8,166 bytes)

56. [Amps] 3000/5000 (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Wed, 17 Feb 2010 01:32:10 -0800
4CX5000 is designed for a coaxial tube socket while the 3CX5000 is designed for direct chassis mounting with no socket as such, required. The 5000 is quite capable of requiring you to change all the
/archives//html/Amps/2010-02/msg00466.html (8,329 bytes)

57. [Amps] HV Fuses (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Wed, 17 Feb 2010 01:46:22 -0800
I have thought a #30 wire or somewhat smaller wire was stretched inside a grounded piece of copper pipe such that there would be no discharge when HV was applied would be a great fuse. This is becaus
/archives//html/Amps/2010-02/msg00467.html (9,140 bytes)

58. [Amps] HV fuses.. don't fuse the B- (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Wed, 17 Feb 2010 03:04:56 -0800
Why not fuse the negative lead instead, which is at potential close to ground? If you do this, you need to be sure the HV ammeter shunt is on the power supply side of the fuse and not the "load" side
/archives//html/Amps/2010-02/msg00470.html (9,855 bytes)

59. Re: [Amps] HV Fuses (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Wed, 17 Feb 2010 04:41:12 -0800
! All as this is going to do is remove B+ from the tube [same as a HV fuse], then create a new problem... a solid B+ to chassis dead short. Now something else has to handle the dead short... like bre
/archives//html/Amps/2010-02/msg00476.html (10,399 bytes)

60. [Amps] 3000/5000 (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Wed, 17 Feb 2010 05:39:56 -0800
I figured there must be a simple way. OTOH that switch doesn't look much like the ones in the old SB200 or 30S-1 <:-)) http://www.multi-tech-industries.com/rswitches.html buy every bit and piece for
/archives//html/Amps/2010-02/msg00478.html (9,070 bytes)

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