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Total 83 documents matching your query.

41. Re: [Amps] SS amps watercooling (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Thu, 16 Feb 2017 13:53:52 -0600
Heat transfer is determined by amount of flow and temperature difference. Slowing the flow does not increase heat transfer. There is an old myth that having a thermostat in a car will make it run coo
/archives//html/Amps/2017-02/msg00106.html (8,177 bytes)

42. Re: [Amps] SS amps watercooling (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Thu, 16 Feb 2017 20:08:01 -0600
I used to have a boat with a couple of Detroit turbo charged/intercooled engines. The cooling loop was a closed loop of fresh water that went thru the intercooler, engine and a sea water heat exchang
/archives//html/Amps/2017-02/msg00109.html (14,995 bytes)

43. Re: [Amps] KAPUT 8877'S -DISPOSAL (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Wed, 22 Mar 2017 12:25:58 -0500
Maybe the heat sink could be salvaged and used on something like a GS35. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.co
/archives//html/Amps/2017-03/msg00149.html (9,579 bytes)

44. Re: [Amps] Price per Watt Conversation (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Tue, 25 Apr 2017 10:55:15 -0500
Not necessarily. When an exciter with IMD is connected to an amp that produces IMD there can be a sum or difference of the two levels of up to 6 dB of the IM levels. So it is possible that the overal
/archives//html/Amps/2017-04/msg00267.html (12,618 bytes)

45. Re: [Amps] 3-500Z cool down time (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Mon, 5 Jun 2017 12:24:13 -0500
Well, the plate is in a vacuum so no heat is conducted to the glass envelope except for the small plate lead pin. All the air in the world isn't going to cool the plate down. Forced air on the tube i
/archives//html/Amps/2017-06/msg00048.html (9,086 bytes)

46. Re: [Amps] Tube amps are not a thing of the past (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Mon, 5 Jun 2017 12:30:48 -0500
Hi Jim, I think that the 4CX1500 has the same grid as the 4CX1000. Somewhere I have seen it written by Eimac that it is ok to draw a small amount of grid current during brief tune up. The Collins 30S
/archives//html/Amps/2017-06/msg00051.html (9,405 bytes)

47. Re: [Amps] SB220 step start blows fuses (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Sun, 9 Jul 2017 22:20:21 -0500
You don't have a big enough bulb. I use two 300 watt bulbs in parallel. 300 watt bulbs are about the largest you can find easily. I made up the bulb unit using a square electrical box and mounted two
/archives//html/Amps/2017-07/msg00039.html (13,345 bytes)

48. Re: [Amps] SB220 step start blows fuses (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Mon, 10 Jul 2017 12:41:52 -0500
Well, yes you would need a bulb in each side of the 220 circuit or two bulbs in series (rather than parallel) on one side, assuming that the amp is not a 4 wire amp that also uses 120 volts. If somet
/archives//html/Amps/2017-07/msg00049.html (18,447 bytes)

49. Re: [Amps] SB220 step start blows fuses (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Mon, 10 Jul 2017 12:46:52 -0500
That's a lot of fuses. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2017-07/msg00050.html (17,716 bytes)

50. Re: [Amps] SB220 step start blows fuses (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Tue, 11 Jul 2017 12:28:20 -0500
That's why in the first post I said that he needed a larger bulb. When operated on 240 volts the amp will draw half the current that it would draw on 120 volts so two of the large bulbs in series on
/archives//html/Amps/2017-07/msg00058.html (12,801 bytes)

51. Re: [Amps] Fil transformer (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Thu, 10 Aug 2017 13:13:09 -0500
Jim, With a filament winding the resistance difference from side to side is hard to see. But the true center tap does not have equal resistance on each side of center. The voltage is determined by th
/archives//html/Amps/2017-08/msg00007.html (12,311 bytes)

52. Re: [Amps] Alpha 87 (not 87A) (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Wed, 8 Nov 2017 12:21:41 -0600
The easiest way to observe splatter is to switch your receiver to the opposite side band and listen for the crud. Intermod products are generated on both sides of the signal. By listening on the oppo
/archives//html/Amps/2017-11/msg00068.html (12,608 bytes)

53. Re: [Amps] amplifier in 1960's QST (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Mon, 4 Dec 2017 12:58:26 -0600
Yes I remember it, although I don't remember much about it other than thinking it was a poor idea at the time. It may have been in 73 magazine around 67 or 68? 73 Gary K4FMX _________________________
/archives//html/Amps/2017-12/msg00015.html (7,822 bytes)

54. Re: [Amps] Multi tube amp (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Sun, 10 Dec 2017 16:48:19 -0600
That's been done with 6AG7's but a 6L6 won't work in GG because it has an internal connected beam forming element/suppressor. 73 Gary K4FMX _______________________________________________ Amps mailin
/archives//html/Amps/2017-12/msg00075.html (40,262 bytes)

55. Re: [Amps] Henry 2k-4 HV inductor (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Tue, 12 Dec 2017 20:11:09 -0600
Be careful of changing the inductance. I am not real familiar with the Henry amp but you seem to indicate that there is a small capacitor in parallel with the choke that would indicate that it is a t
/archives//html/Amps/2017-12/msg00092.html (10,469 bytes)

56. Re: [Amps] Henry 2k-4 HV inductor (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Wed, 13 Dec 2017 13:52:04 -0600
A tuned choke is used to enable a smaller choke to be used. A tuned choke filter has much better dynamic regulation than a conventional choke circuit. A conventional choke is undesirable for SSB use.
/archives//html/Amps/2017-12/msg00097.html (15,726 bytes)

57. Re: [Amps] Series C in amp output (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Wed, 14 Feb 2018 09:59:51 -0600
Since time began small chokes were placed across the amp output pi-net. I don't know where the term got started but everyone seemed to call them "safety chokes" in case of plate blocking failure but
/archives//html/Amps/2018-02/msg00025.html (10,904 bytes)

58. Re: [Amps] Thread size for UHF connectors? (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Wed, 7 Mar 2018 12:34:23 -0600
Hi Roger, I just bought a die for cleaning up threads. It is 5/8 X 24. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/
/archives//html/Amps/2018-03/msg00027.html (9,048 bytes)

59. Re: [Amps] Alpha 77D anode choke swap? (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Wed, 18 Apr 2018 21:38:31 -0500
With a low value choke it will parallel resonate by using some of the plate tuning capacitance. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com htt
/archives//html/Amps/2018-04/msg00043.html (10,165 bytes)

60. Re: [Amps] Super Cathode Driven Tetrodes (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Sat, 20 Oct 2018 13:44:37 -0500
I remember the article by Bill Orr some years ago. Back then I don't think that there was too much thought about linearity though. Stability was good as I remember. Some how I seem to remember that B
/archives//html/Amps/2018-10/msg00081.html (13,451 bytes)

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