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21. Re: [Amps] Which Vg2 for 4CX1500B SSB ? (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Sun, 25 Jul 2004 06:46:27 +0100; Higher power gain, if you need it. Higher maximum output power. There are many who can't bear the idea of running a (clean) 1kW output when the tube is capable of 2kW. If you don't use AM/SSB, then t; /archives//html/Amps/2004-07/msg00174.html (9,561 bytes)
22. Re: [Amps] RE: 4CX250B Screen Supplies (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Mon, 26 Jul 2004 09:27:30 +0100; Yes, it's possible to fool a two tone test with enough capacitance - but in order to approach the results you will get from an electronic regulator, I reckon you need a lot more capacitance than most; /archives//html/Amps/2004-07/msg00193.html (10,563 bytes)
23. [Amps] OT - Bristol wrenches (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Tue, 10 Aug 2004 15:33:38 +0100; I'm trying to help a friend out - he loves his Collins gear and has asked if I know anywhere to get a Bristol wrench for some knobs. The one he wants is 6 flute, .096". They can be got here in Blight; /archives//html/Amps/2004-08/msg00087.html (6,895 bytes)
24. [Amps] 20kW load (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Mon, 16 Aug 2004 09:27:29 +0100; Sorry, lost the original post - this is an update on email sent directly to the poster. Visit http://www.johnsradio-uk.com/products.asp and look up the Bird 8645. Bird spec. it up to 900MHz. Haggle i; /archives//html/Amps/2004-08/msg00151.html (6,667 bytes)
25. Re: [Amps] GBR and radiation exposure (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Fri, 20 Aug 2004 12:05:25 +0100; Sounds a familiar trait. I spent a while working on development of radar stuff, many MW pulse, 10s kW average. There was a certain insanity about the longer standing members of the team - I'm not ce; /archives//html/Amps/2004-08/msg00223.html (7,683 bytes)
26. Re: [Amps] Pin Diodes? (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Fri, 20 Aug 2004 16:47:26 +0100; To find a selection that are readily available, visit www.farnell.com. Choose the UK option (some of the other country links are broken) then online catalogue. Follow Electrical & electronic > diodes; /archives//html/Amps/2004-08/msg00232.html (7,575 bytes)
27. [Amps] 4-250A (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Wed, 25 Aug 2004 10:13:52 +0100; I've come across some of these tubes - are they useful as spares for any commercial kit? Do they have any particular vices or virtues? Thanks, Steve _______________________________________________ Am; /archives//html/Amps/2004-08/msg00286.html (6,584 bytes)
28. Re: [Amps] Thanks! (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Thu, 2 Sep 2004 10:05:02 +0100; It's probably worth trying local outlets or societies that deal with model/remote control cars and 'planes - they seem to use gears and chain/belt drives a lot. Steve ________________________________; /archives//html/Amps/2004-09/msg00037.html (8,018 bytes)
29. Re: [Amps] neg screen I in tetrodes-- TSPA (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Fri, 3 Sep 2004 09:40:07 +0100; As a gross generalisation, I reckon that well used 4CX250s have higher reverse screen current and more flashover problems. I can imagine that tiny amounts of cathode material might disperse over tim; /archives//html/Amps/2004-09/msg00057.html (7,398 bytes)
30. Re: [Amps] a 'circuits' question (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Wed, 8 Sep 2004 15:28:56 +0100; I'm not familiar enough with the 575 to properly answer your question, although I imagine the proposed mod should work. Let me suggest an alternative matching method that was used when I was involved; /archives//html/Amps/2004-09/msg00172.html (8,031 bytes)
31. Re: [BULK] - [Amps] 2m Linear Amp Enquiry (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Fri, 10 Sep 2004 08:36:43 +0100; Search around for the W2GN design using a pair in parallel, it works a treat. I modified the grid circuit to have separate bias control, so it will work with unmatched tubes. Personally, I don't like; /archives//html/Amps/2004-09/msg00180.html (7,817 bytes)
32. Re: [Amps] a 'circuits' question (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Fri, 10 Sep 2004 08:41:50 +0100; It could be true although, in my experience, mismatch has to be very significant before there's any appreciable effect on overall performance (assuming matching for bias voltage, or separate bias con; /archives//html/Amps/2004-09/msg00181.html (7,708 bytes)
33. Re: [BULK] - [Amps] 2m Linear Amp Enquiry (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Fri, 10 Sep 2004 09:07:07 +0100; Ooops - what I meant was - tuned link coupling. A variable untuned link should give you monotonic loading adjustment, the same as a variable series capacitor. Steve __________________________________; /archives//html/Amps/2004-09/msg00182.html (8,179 bytes)
34. Re: [Amps] 2m Linear Amp Enquiry (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Tue, 14 Sep 2004 19:07:05 +0100; I don't know how the capacitances for the Russian tubes are measured, but most manufacturers use a special isolated setup so the output capacitance is only that within the tube itself. I've measured; /archives//html/Amps/2004-09/msg00263.html (8,665 bytes)
35. Re: [Amps] input matching question on the YC156? (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Thu, 16 Sep 2004 17:45:19 +0100; As the cathode heats up, a cloud of electrons build up around it - I'm guessing that this changes the capacitance to ground. The usual form of biassing in gg amps won't prevent the cloud forming and; /archives//html/Amps/2004-09/msg00279.html (7,861 bytes)
36. Re: [Amps] Getting Filament Voltage on an AL-82 (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sun, 19 Sep 2004 09:40:56 +0100; Put a 1k resistors (even 10k) between the filament pins and the jacks (I prefer f/t caps), and you don't have to worry about slipping and shorting anything. With a DVM the resistors won't affect the; /archives//html/Amps/2004-09/msg00329.html (7,755 bytes)
37. Re: [Amps] Equalising resistors with HV diodes (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Mon, 20 Sep 2004 15:38:13 +0100; If I understand it correctly, equalising resistors might hurt you only if you get a reverse voltage spike that exceeds the specified breakdown of the diode chain. In many, if not most, power supplies; /archives//html/Amps/2004-09/msg00356.html (8,955 bytes)
38. Re: [Amps] Equalising resistors with HV diodes (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Mon, 20 Sep 2004 17:42:16 +0100; Sorry, but I don't have that example to refer to right now. If the diodes are modern avalanche types and the current in the resistors is much greater than the leakage in the diode then I can't see ho; /archives//html/Amps/2004-09/msg00363.html (10,622 bytes)
39. Re: [Amps] 20kw Dummy load? (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Thu, 23 Sep 2004 10:06:38 +0100; http://www.johnsradio-uk.com/products.asp Bird 8645 25kW self contained beast. Already a snip but expect 15-20% off if you haggle with cash. In comparison with what you're testing, and the time other; /archives//html/Amps/2004-09/msg00423.html (8,921 bytes)
40. Re: [Amps] Question about Marconi amp filter board (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sat, 2 Oct 2004 08:43:09 +0100; It's not a question of the path the rf will take, but the possible/likely damage to the amplifier modules, not to mention the possibility of oscillation. Please don't do that. Sorry, but there's no a; /archives//html/Amps/2004-10/msg00005.html (7,793 bytes)

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