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61. Re: [Amps] HF and 4cx250b's (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Thu, 15 Jul 2004 18:06:53 +0300; Maybe because years ago the 3-500Z was more accessible for the amateur industry regarding the cost (must consider the sockets also!) and availability and the amp complexity was lower (GG). I am aware; /archives//html/Amps/2004-07/msg00083.html (8,355 bytes)
62. Re: [Amps] Screen supply for pentode (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Mon, 19 Jul 2004 10:17:08 +0300; Hello Oleg, Even if exist, the negative screen current may be low enough to permit the use of a (higher value) bleeder resistor at the series regulator output. But, before building a such project, I; /archives//html/Amps/2004-07/msg00116.html (8,060 bytes)
63. Re: [Amps] HV fuse (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Mon, 19 Jul 2004 19:27:55 +0300; The Harris RF-110A uses a similar circuit for protecting the screen circuit from tube flash over discharge (R series resistor at the bottom of the screen's regulating string of zener which act a SCR;; /archives//html/Amps/2004-07/msg00123.html (12,508 bytes)
64. Re: [Amps] HV fuse (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Tue, 20 Jul 2004 10:22:14 +0300; Hi Rich, I think I wrote it wrong. The fuse was not actually destroyed (exploded) but interrupted, so it did its job. It is quite big, seems to be made from glassfibre+epoxy compound, hard to be dest; /archives//html/Amps/2004-07/msg00136.html (10,137 bytes)
65. Re: [Amps] RG8-U for HV cable (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Mon, 26 Jul 2004 10:54:59 +0300; Hello Will, Thanks for info. Use of the coaxial cables for HV is not a surprise. Years ago, when I was servicing TV sets, I found coaxial cables used for CRT anode connection for old B/W TVs, at 13 t; /archives//html/Amps/2004-07/msg00192.html (11,555 bytes)
66. Re: [Amps] Pin Diodes? (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Fri, 20 Aug 2004 18:08:22 +0300; I remember that for several RadCom issues (Technical Topics) some articles were published on this matter, and some measurements made in DL confirmed the good behaviour of the BA379 for HF Rx front en; /archives//html/Amps/2004-08/msg00230.html (10,593 bytes)
67. Re: [Amps] Pin Diodes? (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Fri, 20 Aug 2004 19:04:01 +0300; Years ago, some were using 1N400x as varicap (including myself) with good results for those years, and for the local condx I may say... Have a nice weekend, 73, Traian, YO9FZS _______________________; /archives//html/Amps/2004-08/msg00234.html (7,608 bytes)
68. Re: [Amps] Coil cooling for tubular coils. (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Sun, 05 Sep 2004 16:11:16 +0300; Hi Will, If you mean circulating the air trough inside the coils copper tubing, this shall be not so efficient. Considering the diameter (small) of the copper tubing used for the coils and its length; /archives//html/Amps/2004-09/msg00074.html (9,510 bytes)
69. Re: [Amps] re cooling of coils (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Mon, 06 Sep 2004 10:35:11 +0300; As I know, the sodium is used for heat transfer for some power plant nuclear reactors also?!... 73, Traian _______________________________________________ Amps mailing list Amps@contesting.com http:/; /archives//html/Amps/2004-09/msg00105.html (8,878 bytes)
70. [Amps] SK300 socket (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Mon, 06 Sep 2004 15:05:46 +0300; Hi all, The new SK300A socket data sheet specify that it require "significantly less blower power and have reduced pressure drop" than the older SK300 version. One of the differences between them is; /archives//html/Amps/2004-09/msg00110.html (7,094 bytes)
71. Re: [Amps] New Panasonic Tube Radio (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Tue, 07 Sep 2004 18:55:26 +0300; Hi all, As for the SS, some AF tube amplifiers are excellent, while others are not so. There are some guys (maybe like us?!) which are still making their own vacuum tube AF amplifiers, and some are q; /archives//html/Amps/2004-09/msg00161.html (10,116 bytes)
72. Re: [Amps] Equalising resistors with HV diodes (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Tue, 21 Sep 2004 10:23:31 +0300; Hi Peter, You are right, but unfortunately it is more than the reliability problem. It seems that counterfeit semiconductors are a big problem these days. Six years ago we were selling and servicing; /archives//html/Amps/2004-09/msg00370.html (11,187 bytes)
73. Re: [Amps] Re: Equalizing resistors with HV diodes (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Wed, 22 Sep 2004 11:55:55 +0300; A local manufacturer here was making different diode type, for example: D6N10 is the "normal" diode, D6F10 is the fast version, D6A10 is the avalanche specified one ("controlled avalanche"), all at t; /archives//html/Amps/2004-09/msg00397.html (8,387 bytes)
74. Re: [Amps] Transfer capacitance, was GI-46B Question (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Sat, 16 Oct 2004 14:12:33 +0200; Hi Jeff, You are right. It is a well known confusion. capacitances between the tube's electrodes (G-C, G-A, A-C) which are absolute values, and not input/output ones which are relative to the device; /archives//html/Amps/2004-10/msg00224.html (9,838 bytes)
75. [Amps] russian tubes ORIGINAL data sheet (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Mon, 18 Oct 2004 18:37:26 +0200; Hi all, I want to point to a great source of information about russian tubes. You can find the original data sheet for most of the russian made transmitting tubes (GI, GS, GK, GM, GMI and GU series),; /archives//html/Amps/2004-10/msg00251.html (7,062 bytes)
76. Re: [Amps] re: baking out tubes (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Mon, 25 Oct 2004 13:44:31 +0200; Hi Bill, May a rather expensive power tube to not have an internal gettering sytem? The getter is used even for the cheapest small signal and low power glass tubes, so why to not be provided for a $5; /archives//html/Amps/2004-10/msg00397.html (9,545 bytes)
77. Re: [Amps] re: baking out tubes (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Tue, 26 Oct 2004 15:18:53 +0200; Hi Steve, Your theory is true for sure. Anyway, the 4S040 is a filament tube (similar with the 4-400C) so no such problem, but material deposit may still exist, maybe because of a previous arc inside; /archives//html/Amps/2004-10/msg00422.html (9,883 bytes)
78. [Amps] GU43B amp for 2m ? (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Tue, 26 Oct 2004 17:38:25 +0200; Hi all, Pictures from a VHF amp using the GU43B tetrode: http://www.ok1kvk.net/pa_gu43b.htm I like the HM socket, the way how the use of a hard to find socket was avoided. May this to be a 2m amp, as; /archives//html/Amps/2004-10/msg00423.html (6,702 bytes)
79. Re: [Amps] GU43B amp for 2m ? (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Wed, 27 Oct 2004 10:44:47 +0200; Hello Conrad, You are right. Grounding the screen may be the best for stability, this was used for some commercial amps also (the Collins 30S maybe, 4CX1000 or 1500B). I don't have details from that; /archives//html/Amps/2004-10/msg00436.html (10,710 bytes)
80. Re: [Amps] Who did it ? (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Wed, 27 Oct 2004 18:04:25 +0200; Look here for one, nice glowing 450TH: http://www5a.biglobe.ne.jp/~jh2clv/handmaderadio.htm I knew for another one, but can't remember now... 73, Traian ______________________________________________; /archives//html/Amps/2004-10/msg00445.html (7,030 bytes)

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