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1. [Amps] TV sweep tubes and 6146s (score: 1): Author: Tom Bowman <wa3rey@comcast.net>; Date: Wed, 10 Aug 2005 06:54:18 -0400; What is the reason amplifiers never seem to be designed using four 6146s instead of TV sweep tubes like for example, four 6KD6s? I must be missing something obvious here. I'm asking because I'm think; /archives//html/Amps/2005-08/msg00366.html (6,375 bytes)
2. Re: [Amps] TV sweep tubes and 6146s (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Wed, 10 Aug 2005 07:08:53 -0400; Tom, There's been a few built with them, just not any legal ones that I know of. The reason being is that some of the sweep tubes have greater power out than the 6146B did. Four M-2057's or 8908's wo; /archives//html/Amps/2005-08/msg00367.html (8,841 bytes)
3. Re: [Amps] TV sweep tubes and 6146s (score: 1): Author: "m.ford" <k1ern@direcway.com>; Date: Wed, 10 Aug 2005 07:35:35 -0400; Tom, In ancient times sweep tubes and homebrewers were cheap and plentiful. Today, nothing is cheap or plentiful. Mike k1ern _______________________________________________ Amps mailing list Amps@con; /archives//html/Amps/2005-08/msg00369.html (8,096 bytes)
4. Re: [Amps] TV sweep tubes and 6146s (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 10 Aug 2005 13:44:01 +0200 (CEST); Back when I had almost limitless supplies of 6146Bs, I ran a pair at 1200 volts on the plates. They lasted well, provided you didn't run steady carrier, and gave about 180watts PEP out with 3rd order; /archives//html/Amps/2005-08/msg00370.html (8,532 bytes)
5. Re: [Amps] TV sweep tubes and 6146s (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Wed, 10 Aug 2005 13:45:16 +0200; Without grossly abusing the 6146's, you cannot expect more than about 250 W PEP output from four 6146 tubes. The reason that sweep tubes can give more power is that they have very large peak emission; /archives//html/Amps/2005-08/msg00371.html (9,659 bytes)
6. Re: [Amps] TV sweep tubes and 6146s (score: 1): Author: "Bill Coleman N2BC" <n2bc@stny.rr.com>; Date: Wed, 10 Aug 2005 07:47:46 -0400; $$$ Sweep tubes were $3, 6146's were $8 to $10. Even better, you could re-tube a sweeper at Radio Shack with a handful of guaranteed forever tubes and never pay for another one. I used to freebie rep; /archives//html/Amps/2005-08/msg00372.html (8,431 bytes)
7. Re: [Amps] TV sweep tubes and 6146s (score: 1): Author: "Dr. William J. Schmidt, II" <bill@wjschmidt.com>; Date: Wed, 10 Aug 2005 08:16:19 -0500; I would think that using surplus tubes in the same basic price class (813's, 572B's, or 811A's), you would get a much higher "watt per dollar" return. Sincerely, Dr. William J. Schmidt, II K9HZ Trust; /archives//html/Amps/2005-08/msg00373.html (9,233 bytes)
8. Re: [Amps] TV sweep tubes and 6146s (score: 1): Author: R.Measures <r@somis.org>; Date: Wed, 10 Aug 2005 06:47:34 -0700; The best watts per dollar tube is seemingly the 8171. They go for c. $200 on eBay. That figures out to c. 12-cents per watt, including shipping. Richard L. Measures, AG6K, 805.386.3734. www.somis.org; /archives//html/Amps/2005-08/msg00375.html (9,746 bytes)
9. Re: [Amps] TV sweep tubes and 6146s (score: 1): Author: "Dr. William J. Schmidt, II" <bill@wjschmidt.com>; Date: Wed, 10 Aug 2005 09:03:12 -0500; Ah yes! good choice!, but there is an absolute price constraint as well; 8171's are not in the same basic price class as the aforementioned tubes... Sincerely, Dr. William J. Schmidt, II K9HZ Trustee; /archives//html/Amps/2005-08/msg00376.html (11,666 bytes)
10. Re: [Amps] TV sweep tubes and 6146s (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 10 Aug 2005 16:40:31 +0200 (CEST); For 400 watts, I think you might get it with 4 6146Bs, with 1400 on the plates. You would need lots of cooling, no speech processing, a pulser for tuning, a big box of spares and no SSTV or RTTY. The; /archives//html/Amps/2005-08/msg00378.html (10,416 bytes)
11. Re: [Amps] TV sweep tubes and 6146s (score: 1): Author: R.Measures <r@somis.org>; Date: Wed, 10 Aug 2005 07:42:29 -0700; Good point, but, on occasion, a big stick is not without amusing uses. Richard L. Measures, AG6K, 805.386.3734. www.somis.org _______________________________________________ Amps mailing list Amps@co; /archives//html/Amps/2005-08/msg00379.html (12,255 bytes)
12. Re: [Amps] TV sweep tubes and 6146s (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Wed, 10 Aug 2005 17:43:23 +0200; I would tend to agree with Peter. The surplus 813 is probably one of the available tubes with best W/$, but a factor may be the cost of the HV power supply. This is one of the problems with most inex; /archives//html/Amps/2005-08/msg00381.html (13,639 bytes)
13. Re: [Amps] TV sweep tubes and 6146s (score: 1): Author: "va3pl @ cuic.ca" <va3pl@cuic.ca>; Date: Wed, 10 Aug 2005 11:53:41 -0400; , of which the ex-microwave oven power transformer (95 SEK + carriage) took half. Is anybody building small amp using microwave oven power transformer? How those transformer are made and what kind of; /archives//html/Amps/2005-08/msg00382.html (8,982 bytes)
14. Re: [Amps] TV sweep tubes and 6146s (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Wed, 10 Aug 2005 18:27:00 +0200; This particular transformer was a special brand of surplus HV transformer, coming out of the first generation microwave ovens from the Swedish manufacturer Husqvarna. It had a 2200 V 1,1 A CCS second; /archives//html/Amps/2005-08/msg00383.html (10,583 bytes)
15. Re: [Amps] TV sweep tubes and 6146s (score: 1): Author: "Fortra" <fortra@siol.net>; Date: Wed, 10 Aug 2005 18:52:19 +0200; Hi Karl-Arne, could you quote some more brands of microwaves ovens, having mentioned transformers and it would be helpful year of manufacturing. Here we go, buying your old microwave ovens for peanut; /archives//html/Amps/2005-08/msg00384.html (11,044 bytes)
16. Re: [Amps] TV sweep tubes and 6146s (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Wed, 10 Aug 2005 14:22:16 -0400; There was another member a few months back going to use one and we had a big discussion on it and how to desin one. Look back in the archives by doing a search for microwave transformer. If you cant; /archives//html/Amps/2005-08/msg00389.html (9,585 bytes)
17. Re: [Amps] TV sweep tubes and 6146s (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Wed, 10 Aug 2005 14:35:15 -0400; I was thinking maybe 6 would get him 400 watts without pushing the tubes way past their ratings. They will be anyhow, but I wouldn't use over say +900 Vdc on the plates. That's still a good bit over; /archives//html/Amps/2005-08/msg00390.html (12,407 bytes)
18. Re: [Amps] TV sweep tubes and 6146s (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Wed, 10 Aug 2005 22:05:52 +0200; Speaking of 'grossly abuse', I found some SSB ratings for the 6146 family in my worn copy of the W6SAI 'Radio Handbook 18th Ed' If you apply a liberal definition of 'linear', it would be possible to; /archives//html/Amps/2005-08/msg00391.html (14,158 bytes)
19. Re: [Amps] TV sweep tubes and 6146s (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Thu, 11 Aug 2005 06:26:12 -0400; Karl-Arne, Just goes to show my guess was even high and I was trying to be low about it. That get's it down to maybe 700 Vdc on the plates and that will probably not be too good for IMD either. Plus; /archives//html/Amps/2005-08/msg00397.html (16,638 bytes)
20. Re: [Amps] TV sweep tubes and 6146s (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Thu, 11 Aug 2005 06:51:05 -0400; If it were me going to build a new sweep tube type amp, I'd look at the new 6550 tubes. Their maximum dissapation is around 40 watts which equals a 6LF6 in power. They dont have an anode cap, and the; /archives//html/Amps/2005-08/msg00399.html (9,840 bytes)

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