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361. Re: [Amps] Silver oxide is an insulator (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Wed, 13 Feb 2008 07:47:09 -0500
The only thing it encourages is a certain lunatic fringe that makes a profit selling snake oil cures. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com h
/archives//html/Amps/2008-02/msg00076.html (8,041 bytes)

362. Re: [Amps] filament supply D.C or A.C (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Wed, 13 Feb 2008 09:01:10 -0500
When in doubt ask the manufacturer. Transmitting tube filaments come in thoriated tungsten and oxide coated; trying to compare all against a panel lamp is rather ridiculous. I can see the benefit of
/archives//html/Amps/2008-02/msg00080.html (9,768 bytes)

363. Re: [Amps] Looking for eimac 3-500Z (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Thu, 14 Feb 2008 09:45:38 -0500
The L4 blower is sufficient to keep the tube seal temperates well within spec during normal CW/SSB use. For RTTY and digital use run it at about 700-800W output by reducing the input drive. After 45
/archives//html/Amps/2008-02/msg00093.html (8,737 bytes)

364. Re: [Amps] #10 Teflon Needed (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sun, 17 Feb 2008 07:14:33 -0500
Huh? What does #10 wire have to do with a SB-220 which has 8 filter caps BTW?? You lost me somewhere. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com h
/archives//html/Amps/2008-02/msg00111.html (8,173 bytes)

365. Re: [Amps] #10 Teflon Needed (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sun, 17 Feb 2008 13:14:36 -0500
Im sure that #12 will do whatever you are trying to do, that size is readily available as mentioned by others. However at that DC level even short lengths of #14 are overkill. If you plan to use the
/archives//html/Amps/2008-02/msg00115.html (9,480 bytes)

366. Re: [Amps] (no subject) (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Tue, 19 Feb 2008 14:11:25 -0500
Ive used similar sized caps at about 1/2 to 2/3 of their voltage in generic FW and also doubler supplies with no sign of heating. These were fairly popular 10-20 years ago for home brew and reports w
/archives//html/Amps/2008-02/msg00131.html (8,855 bytes)

367. Re: [Amps] Needed Info (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Thu, 21 Feb 2008 11:46:14 -0500
For reliability it has to be tested to 5-6 times that level in order to validate the builders skills. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com h
/archives//html/Amps/2008-02/msg00142.html (8,603 bytes)

368. Re: [Amps] Duration of time delay for soft start (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Fri, 22 Feb 2008 10:29:29 -0500
The Harbach unit is a second or less which is more than enough time for most ham linears. My big supplies use a RC delay of about 5 seconds but some of them go up to 7500V with a 50 MF 10KV oil fille
/archives//html/Amps/2008-02/msg00151.html (8,857 bytes)

369. Re: [Amps] SB-220 w/5 3-500 (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Fri, 22 Feb 2008 19:58:27 -0500
Some CBers arent much different than some hams when it comes to illegal power. 3CX3000, 4CX5000 and 3CX10000 are used by both and that is just a fraction of the big tubes in use. Carl KM1H __________
/archives//html/Amps/2008-02/msg00158.html (11,098 bytes)

370. Re: [Amps] SB220 w/5 3-500 (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sat, 23 Feb 2008 14:52:53 -0500
One of the nicest CB amps Ive seen was a 4CX5000A crafted in a way that would make anyone proud. On the flip side I know of a 75M type running a 3CX10000 that is an absolute death trap. With his prop
/archives//html/Amps/2008-02/msg00163.html (8,119 bytes)

371. Re: [Amps] Heathkit HA-10 Warrior (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sat, 23 Feb 2008 23:30:59 -0500
Use 572B's for more dissipation and take advantage of the higher B+. Add a small cooling fan.. For CW/SSB go to a capacitor filter and lose the choke if Heyboers xfmr can handle it. Carl KM1H _______
/archives//html/Amps/2008-02/msg00166.html (9,186 bytes)

372. Re: [Amps] how to wind an HF broadband 10:1 transformer (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sun, 24 Feb 2008 15:56:39 -0500
Iron powder #2 mix is most commonly used in broadband baluns between an antenna tuner and open wire line. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.c
/archives//html/Amps/2008-02/msg00174.html (7,912 bytes)

373. Re: [Amps] SB220 w/5 3-500 (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sun, 24 Feb 2008 15:58:40 -0500
I think that question was answered back in the initial post....... Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/
/archives//html/Amps/2008-02/msg00175.html (7,672 bytes)

374. Re: [Amps] how to wind an HF broadband 10:1 transformer (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sun, 24 Feb 2008 20:18:49 -0500
Anyone can paint a toroid and without measuring the inductance of a few turns and running the math you have no positive idea what you have. Red and yellow are Micrometal #2 and #6 mix respectively. I
/archives//html/Amps/2008-02/msg00179.html (10,526 bytes)

375. Re: [Amps] Warrior power amplifier (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sun, 24 Feb 2008 20:33:35 -0500
I forgot to mention that the 811A and 572B quit being zero bias above 1250V for the 811A and around 1500V for the 572B. In the SB-200 the operating grid voltage is around -3V, when that bias is remov
/archives//html/Amps/2008-02/msg00180.html (10,713 bytes)

376. Re: [Amps] CW & SSB amp (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Mon, 25 Feb 2008 22:18:32 -0500
Leave it Class B, no body will be able to tell the power difference but others on the band will be happier. 813's run very well at 2500V with a little bit of air. Carl KM1H __________________________
/archives//html/Amps/2008-02/msg00188.html (7,747 bytes)

377. Re: [Amps] Need SB-221 tuning cap (26-164) (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Tue, 26 Feb 2008 09:36:24 -0500
Im out of them also, they go on Ebay as soon as I pull one out. The swap requires drilling a new rear hole as well as obtaining an aluminum spacer to connect the mounting plate to the tank coil. Band
/archives//html/Amps/2008-02/msg00191.html (9,063 bytes)

378. Re: [Amps] how to wind an HF broadband 10:1 transformer (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Tue, 26 Feb 2008 09:51:05 -0500
Manfred, my reply was assuming use at high power since this is not a QRP or receiver forum. In that case iron powder is the only accepted material as has been proven time and time. Even Sevik was for
/archives//html/Amps/2008-02/msg00192.html (14,136 bytes)

379. Re: [Amps] how to wind an HF broadband 10:1 transformer (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Tue, 26 Feb 2008 15:49:42 -0500
Very true and that observation goes back to way before JI and is in the original Micek Beverage book. OTOH it does not fit all installations. At a prior QTH I had 1000-1500' feedlines and using 61 ma
/archives//html/Amps/2008-02/msg00195.html (10,510 bytes)

380. Re: [Amps] filament tube life, turn on's and time on target (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Thu, 28 Feb 2008 09:58:44 -0500
There is no damage to that series of tubes by turning it on and off a few times a day as long as the warmup cycle is observed. They use low current, slow warming, oxide coated heaters that are not su
/archives//html/Amps/2008-02/msg00205.html (9,405 bytes)

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