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321. Re: [Amps] PEP power.. (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 16 Oct 2006 22:27:49 +0200 (CEST); I think one of the problems appears because 'average' implies a degree of integration over time divided by time. Then the length of time becomes an impotant but undefined parameter. Personally, I'm a; /archives//html/Amps/2006-10/msg00185.html (8,627 bytes)
322. Re: [Amps] drill bits (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 30 Oct 2006 23:35:22 +0100 (CET); I've had some success using carbide tipped masonry drills on hardened steel. But they need a fair amount of power, so, as everyone else says, start small and work up. If they won't touch it, oxy-acet; /archives//html/Amps/2006-10/msg00320.html (7,630 bytes)
323. Re: [Amps] drill bits (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 1 Nov 2006 02:21:13 +0100 (CET); Bud asked: Can someone tell me how to drill small holes (for pots, 1/8-inch phone jacks, RCA phono jacks, etc.) in typical small aluminum chassis (plural) so that the holes aren't triangular?< Firstl; /archives//html/Amps/2006-10/msg00326.html (9,246 bytes)
324. Re: [Amps] drill bits (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 1 Nov 2006 06:55:51 +0100 (CET); Step bits have their uses, but they don't always have the right size steps.............. they're expensive too, compared with using G clamps to hold things on the drill table. And to cause confusion,; /archives//html/Amps/2006-11/msg00001.html (6,569 bytes)
325. Re: [Amps] 4CX1500 class AB1 vs. AB2 (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 2 Nov 2006 04:16:47 +0100 (CET); distortion. This seems to limit the tube to 1100W output. I am considering adding a switch to change the screen and grid bias to allow me to run it in AB1 service as well for 1500W output.< Generally; /archives//html/Amps/2006-11/msg00028.html (7,995 bytes)
326. Re: [Amps] 4CX1500 class AB1 vs. AB2 (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 2 Nov 2006 23:26:31 +0100 (CET); That makes two of us then, Tom. Putting NFB on in a grounded cathode amp isn't that difficult - some resistance in the cathode - say 10 ohms - with a suitable RFC across it so the effective bias does; /archives//html/Amps/2006-11/msg00042.html (8,566 bytes)
327. Re: [Amps] Class C amp for RTTY contesting... (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 3 Nov 2006 01:43:53 +0100 (CET); How come so many of the old rigs managed to key a low level stage without getting too much in the way of clicks? I can see that a clamp tube would prevent too much sharpening of the edges, but there; /archives//html/Amps/2006-11/msg00046.html (7,824 bytes)
328. Re: [Amps] Class C amp for RTTY contesting... (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 3 Nov 2006 15:55:03 +0100 (CET); http://www.w8ji.com/heathkit.htm< Certainly the stock DX60 doesn't look too good. After all this time, I can't remember what my DX40 was like: I think is was beter than that, although that TX got mod; /archives//html/Amps/2006-11/msg00055.html (8,660 bytes)
329. Re: [Amps] Zener Bias Replacement (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 7 Nov 2006 09:30:58 +0100 (CET); I can never remember which way round the TC goes, but below about 5 and a bit volts, it's Zener breakdown, and above that, it's avalanche breakdown. Because of the turnover, at about 5.6 to 6 volts,; /archives//html/Amps/2006-11/msg00099.html (8,117 bytes)
330. Re: [Amps] pi filter QBL 5/3500 (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 7 Nov 2006 15:06:11 +0100 (CET); The linearity of the G2DAF was questioned by a professional valve design and applications engineer (the late G6JP) shortly after the circuit was first published some 40 years ago. Subsequent events h; /archives//html/Amps/2006-11/msg00103.html (7,640 bytes)
331. Re: [Amps] Russian power L-coupler (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 17 Nov 2006 16:25:57 +0100 (CET); They have terrible Q at minimum inductance, especially at higher frequencies. Of all the common methods, this is the least efficient way to vary inductance over a wide range.< Strictly, a variometer; /archives//html/Amps/2006-11/msg00216.html (8,058 bytes)
332. Re: [Amps] Russian power L-coupler (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 17 Nov 2006 17:37:20 +0100 (CET); the final. That radio also used a variometer as an ATU, it was a very quick and reliable means of coupling random wires or verticals to the rig from 2-8MHz< I had forgotten the 19 set - mainly, I sup; /archives//html/Amps/2006-11/msg00218.html (7,529 bytes)
333. Re: [Amps] Prmetheus (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 24 Nov 2006 11:09:54 +0100 (CET); 2400 watts PEP< Depending on the power supply, the PEP on voice might be a bit higher. In Greek mythology, Prometheus was the son of a Titan, and the brother of Atlas.........does this show the desce; /archives//html/Amps/2006-11/msg00258.html (7,639 bytes)
334. Re: [Amps] Buying Amp (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 29 Nov 2006 23:56:49 +0100 (CET); Figure it this way - 'How long are you aiming to keep this amp for?' 5 years? - You probably don't need to worry 10 years? - you should get at least one spare set of output devices - whether they're; /archives//html/Amps/2006-11/msg00277.html (7,428 bytes)
335. Re: [Amps] Follow-up on Bouncy Meter (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 3 Dec 2006 07:58:44 +0100 (CET); not functioning properly? Replacing these meters with new, old stock costs about $70 - is it worth fixing the old one?< Sounds a bit as if one or both hairspings have become unconnected. It's got to; /archives//html/Amps/2006-12/msg00003.html (11,234 bytes)
336. Re: [Amps] *** SPAM *** Re: Follow-up on Bouncy Meter (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 4 Dec 2006 12:32:38 +0100 (CET); through the springs in conventional movements), < many of the older meters I've come across still read even with a broken hairspring because there's a current path through the bearing. I've found rel; /archives//html/Amps/2006-12/msg00010.html (7,714 bytes)
337. Re: [Amps] 2 x 4-250A Amp (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 17 Dec 2006 10:28:13 +0100 (CET); My experience with grounded cathode, passive grid, 4-250As - for what it's worth. I found better linearity running in AB2, with some NFB from 10 ohm resistors, un-bypassed RF wise, in the filament ci; /archives//html/Amps/2006-12/msg00111.html (10,461 bytes)
338. Re: [Amps] 2 x 4-250A Amp (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 18 Dec 2006 06:52:58 +0100 (CET); regulated. It also needs a shunt regulator, or a series regulator with a heavy bleeder. It also needs current limited.< I've never seen negative screen current with 4-250As (as opposed to the 4CX, wh; /archives//html/Amps/2006-12/msg00126.html (8,185 bytes)
339. Re: [Amps] *** SPAM *** Re: 2 x 4-250A Amp (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 18 Dec 2006 07:08:01 +0100 (CET); Hsu, As far as I am aware, all the 'T' series numbers from Mullard and Philips are triodes. I can't find a data sheet for TB3.5/750: there is a TB3/750, which is medium mu triode (mu =25). Using 4-25; /archives//html/Amps/2006-12/msg00127.html (7,479 bytes)
340. Re: [Amps] filament choke (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 18 Dec 2006 11:40:29 +0100 (CET); The filament chokes I use in my grid driven amplifier for applying NFB are wound on ferrite toroids, about 2 inches in diameter and 3/8 inch wide and thick. But they have lower inductance, as they on; /archives//html/Amps/2006-12/msg00131.html (7,479 bytes)

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