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41. Re: [Amps] which HV connector to use? (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Thu, 14 Jan 2010 23:58:40 +0000; No. I am rebuilding a 2 X 813 amplifier that a friend gave me, mostly updating the power supply. I plan on using Belden 8866 Ultor wire, that 3/16" red stuff that goes to the bell of the CRT, it is; /archives//html/Amps/2010-01/msg00182.html (9,312 bytes)
42. Re: [Amps] HELP Modifications for a Kenwood TL922 (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Wed, 27 Jan 2010 09:09:13 -0500; /*snip*/ You do NOT have to change the transformer! You could replace the missing "tube filament" with a resistor, a good calculation and example of Ohms law. -- Ron KA4INM - I'm proud to be Chuck's; /archives//html/Amps/2010-01/msg00378.html (8,614 bytes)
43. Re: [Amps] 3 1/8 EIA flange adaptor wanted (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Thu, 28 Jan 2010 18:42:07 +0000; You can always attach a short piece of coax with a ring terminal and a bolt with two washers and a nut. Clamp onto the edge of the inner and put the shield somewhere on the loads outer outer for the; /archives//html/Amps/2010-01/msg00399.html (7,848 bytes)
44. Re: [Amps] Ameritron (et. al.) filament voltages (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Fri, 29 Jan 2010 02:23:33 +0000; Just after I got married I bought two 75 Watt long life 120 Volt "Krypton" lamps for my new front porch lamp as it was a pain to change. (at $5 each) The first lasted 1/2 an hour, thinking it was a; /archives//html/Amps/2010-01/msg00409.html (9,698 bytes)
45. Re: [Amps] Good amp to buy maybe build.. (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Sat, 30 Jan 2010 13:10:12 +0000; /*snip*/ I would only build an amplifier from HAMfests and the Inet. Building your own is part of the fun in HAM Radio for us technologically minded HAMS, that is what drew us in in the first place.; /archives//html/Amps/2010-01/msg00497.html (9,620 bytes)
46. Re: [Amps] Fw: Good amp to buy /amp notes (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Sat, 30 Jan 2010 15:42:21 +0000; I've never related tuning with headroom and I don't get it. Tuning has always acted like and an adjustable attenuator to an amplifier's transfer charismatics. Tuning's impedance matching seems prima; /archives//html/Amps/2010-01/msg00509.html (8,668 bytes)
47. [Amps] Tuning amplifiers (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Sat, 30 Jan 2010 19:59:46 +0000; Anyone: I am confused by some of the things I am reading here about tuning, but I have long heard triodes and tetrodes are tuned differently, I have never figured out why or what, could someone enlig; /archives//html/Amps/2010-01/msg00521.html (6,826 bytes)
48. Re: [Amps] Tuning amplifiers (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Sat, 30 Jan 2010 22:08:29 +0000; * That would be easy to make, two identical power meters fed from the input and from the output, the one fed by the output experiencing the same attenuation as the gain of the amplifier, a zero cent; /archives//html/Amps/2010-01/msg00527.html (8,397 bytes)
49. Re: [Amps] Fw: Good amp to buy /amp notes (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Sun, 31 Jan 2010 14:28:10 +0000; The short coming to the "internal type of ALC" is that is doesn't take into account anything occurring in the subsequent amplifier/s. This could include the screen current of tetrode and pentode tub; /archives//html/Amps/2010-01/msg00569.html (9,754 bytes)
50. Re: [Amps] I dont accept answers to why did Heath die? (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Mon, 01 Feb 2010 09:25:04 -0500; I have a good example, I sent off for a large Heath transistor tester over 40 years ago. Upon examination one of the rotary switches (there are two rows, next to the meter and others) did not match; /archives//html/Amps/2010-02/msg00009.html (8,220 bytes)
51. Re: [Amps] QRO Questions (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Sat, 06 Feb 2010 15:45:07 +0000; There is a PTFE coax about the size of RG-58 with less loss and more power handling capacity than RG214 so what you mention is a lot more than probable. (as is 1/4" superflex) I like the Times LMR p; /archives//html/Amps/2010-02/msg00143.html (7,589 bytes)
52. Re: [Amps] HV relay (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Sat, 06 Feb 2010 15:49:10 +0000; switch on the hV supply ( and probably darn slow to disengage if a fault occurs) I would like to use a Vac relay - probably close to the Plate choke since I have room in that compartment and a delay; /archives//html/Amps/2010-02/msg00144.html (8,417 bytes)
53. Re: [Amps] QRO Questions (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Sun, 07 Feb 2010 01:57:00 +0000; I don't know how high, high is (I'm not familiar with RG-17) but I have put over 55 kV (dc) on common RG-8/U (all day) with no trouble, in fact a 6' length of RG-8 is the negative lead of the Hi-pot; /archives//html/Amps/2010-02/msg00167.html (9,196 bytes)
54. Re: [Amps] Vac Relays for B+ (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Sun, 07 Feb 2010 16:02:14 +0000; I don't understand why putting the 25 Ohm resistance in one transformer secondary lead wouldn't serve all needs, turn on surge (cap. charge), control arc and shorted condition overload and current l; /archives//html/Amps/2010-02/msg00185.html (8,867 bytes)
55. Re: [Amps] HV relay (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Sun, 07 Feb 2010 16:55:44 +0000; I'm rebuilding my first HAM amplifier, (a gift from a friend) but with the Alpha 77DX/SX what happens when there is a tube overload condition, is there any over current protection? That is why I am; /archives//html/Amps/2010-02/msg00189.html (9,363 bytes)
56. Re: [Amps] step start /triacs (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Mon, 08 Feb 2010 09:31:05 -0500; I am learning so much from this list. I am thinking about using a power transistor (a 1,200 to 1,500 Volt - horizontal output) in a bridge rectifier as a SS relay in the PS that I am rebuilding. Dri; /archives//html/Amps/2010-02/msg00232.html (7,902 bytes)
57. Re: [Amps] Resistor Before the Capacitor? (long) (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Mon, 08 Feb 2010 14:05:00 -0500; I disagree, as noted earlier, current only flows from the rectifier into the capacitor when the capacitor is discharged below the rectifier's output Voltage resulting in quite high current pulses ne; /archives//html/Amps/2010-02/msg00250.html (8,789 bytes)
58. Re: [Amps] Results from new PSUD... resistor b4 the B+ filter caps ! (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Thu, 11 Feb 2010 16:50:29 -0500; With 50 years of fixing (and building) electronic thingies and 47 years as a broadcast engineer, I do not recall finding a shorted electrolytic capacitor unless it was damaged by an outside influenc; /archives//html/Amps/2010-02/msg00321.html (9,435 bytes)
59. [Amps] L-4PS Transformer Buzz (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Mon, 15 Feb 2010 18:47:42 +0000; I've seen this many times when a diode shorts out, even car alternators "whine" when one diode shorts out. -- Ron KA4INM - He who attacks the fundamentals of the American broadcasting industry attac; /archives//html/Amps/2010-02/msg00410.html (7,855 bytes)
60. Re: [Amps] HV Fuses (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Wed, 17 Feb 2010 08:49:51 -0500; I think it would be better to put it into a glass or fiber (like 600 Volt fuses are enclosed in) tube so the arc can't travel between the ends through the conductive tube. (neon sign scraps) -- Ron; /archives//html/Amps/2010-02/msg00479.html (9,066 bytes)

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