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381. Re: [Amps] SB-220: 1,800 Watts Output (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Sun, 29 Nov 2009 16:51:18 -0500
Which reminds me, Did all of them have two tubes in the final? I'll swear the one I had only had one tube in the final, but that was over 30 years ago which is a long way to stretch an old memory. OT
/archives//html/Amps/2009-11/msg00288.html (8,520 bytes)

382. Re: [Amps] SB-220: 1,800 Watts Output (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Sun, 29 Nov 2009 17:22:45 -0500
Sorry, I was referring tot he KWS-1 listed at 1500 watts out because that's what it said on the name plate. 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@cont
/archives//html/Amps/2009-11/msg00290.html (11,009 bytes)

383. Re: [Amps] SB-220: 1,800 Watts Output (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Mon, 30 Nov 2009 14:24:23 -0500
I think I heard one of those on 75 late last night...and I do mean on, or was it over <:-)) 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http:
/archives//html/Amps/2009-11/msg00310.html (8,265 bytes)

384. Re: [Amps] Advice (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Wed, 02 Dec 2009 20:52:53 -0500
"To me" chasing DX, working Aurora, or contests, every db counts.<:-)) Although the 3-500's and 572Bs are considered poor tubes for VHF due to the long internal leads, they work quite well in a prope
/archives//html/Amps/2009-12/msg00057.html (11,261 bytes)

385. Re: [Amps] Advice (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Wed, 02 Dec 2009 22:13:02 -0500
Agreed, but what's wrong with 2 8877's? They should last forever at 1500 out in that 6 n' 2 amp in the handbook. <:-)) True, they're not cheap, but if you want the best...Tubes should always be used
/archives//html/Amps/2009-12/msg00063.html (16,141 bytes)

386. Re: [Amps] Advice (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Wed, 02 Dec 2009 22:15:44 -0500
Or chasing contacts on Aurora where the signals are nothing more than a change in the sound of the background noise 73, Roger (K8RI) _______________________________________________ Amps mailing list
/archives//html/Amps/2009-12/msg00065.html (8,943 bytes)

387. Re: [Amps] Advice (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Thu, 03 Dec 2009 17:34:18 -0500
Sure, If one tube can do the job, then two has to do it even better. <:-)) Isn't that the contesters motto? You can go with a single tube, but the "bigger ones" draw tremendous filament power and a p
/archives//html/Amps/2009-12/msg00097.html (8,947 bytes)

388. Re: [Amps] (no subject) (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Fri, 04 Dec 2009 01:27:25 -0500
What did they sell for new? Although recent sales have been in the $1000 range and a search shows a dealer selling a used one "like new" with new tubes for $1000 It's more than I'd go, but were I aft
/archives//html/Amps/2009-12/msg00104.html (7,097 bytes)

389. Re: [Amps] Advice (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Fri, 04 Dec 2009 04:42:14 -0500
And they are relatively cheap and available. I saw a bunch of them for $25 each last week. Remember the "sweep tube" amps of the 70's? AKA the GLA1000 and a bunch of others. Thats when tubes were rea
/archives//html/Amps/2009-12/msg00105.html (10,484 bytes)

390. Re: [Amps] (no subject) (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Fri, 04 Dec 2009 14:33:49 -0500
I've never had a problem with an 813...so far. PL-172s OTOH... 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailma
/archives//html/Amps/2009-12/msg00116.html (7,977 bytes)

391. Re: [Amps] Advice (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Sat, 05 Dec 2009 17:05:36 -0500
I could easily run the legal limit with one FU728F, 8877, or 4CX-1500B but with a pair of them still running the legal limit they will take a little more volume, but not require near the back pressur
/archives//html/Amps/2009-12/msg00133.html (10,004 bytes)

392. Re: [Amps] Advice (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Sun, 06 Dec 2009 02:09:14 -0500
Cooling flow and pressure are like voltage, amps, and resistance the figures as given in the data sheets tell two things. That the tube needs a given flow in CFM for a given power and that the "fan"
/archives//html/Amps/2009-12/msg00152.html (20,972 bytes)

393. Re: [Amps] Advice (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Sun, 06 Dec 2009 13:49:49 -0500
I have been running 4 quad core, high performance computers with video cards that draw over 300 watts and sound like a turbine starting up. I have to vacuum the air intake filters about every 3 month
/archives//html/Amps/2009-12/msg00170.html (9,747 bytes)

394. Re: [Amps] Conservation of Energy! (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Sun, 06 Dec 2009 15:31:08 -0500
When working in the shop I leave the rig on some where between 7.150 and 7.165. 40 is still behaving much like 20 in the higher portion of the sunspot cycle, but it does it in the middle of the night
/archives//html/Amps/2009-12/msg00175.html (10,644 bytes)

395. Re: [Amps] Conservation of Energy! (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Sun, 06 Dec 2009 15:47:58 -0500
It's higher than that in California as I've seen reports of up to 38 cents per KWH during peak demand. Here it's roughly 10 cents per KWH At the legal limit of 1500 PEP out and a 20% duty cycle you a
/archives//html/Amps/2009-12/msg00176.html (10,794 bytes)

396. Re: [Amps] Dummy Loads & Wattmeters (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Sun, 06 Dec 2009 20:06:21 -0500
The answer for most hams is..They don't need to know how much power they are running out except for a reference...IOW the rig isn't putting out as much as it used to. But for those running power ther
/archives//html/Amps/2009-12/msg00181.html (11,785 bytes)

397. Re: [Amps] Advice (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Mon, 07 Dec 2009 21:22:23 -0500
It's quite common when going through designs for ceramic/metal tubes from different times to see the maximum seal temps vary from 200 to 250C. 73 Roger (K8RI) ________________________________________
/archives//html/Amps/2009-12/msg00216.html (10,518 bytes)

398. Re: [Amps] Taylor Tubes (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Tue, 08 Dec 2009 23:06:59 -0500
I've used their 3-500's with no problems, but I only had them for about a year before I sold the amp. 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting
/archives//html/Amps/2009-12/msg00241.html (7,391 bytes)

399. Re: [Amps] Chinese DIN connectors (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Thu, 10 Dec 2009 14:28:50 -0500
For the 897D I purchased some Apple printer cables from Amazon (6' and 8' IIRC). I think all three cables cost less than $9.00. I cut them to length and basically ended up with two out of each one. T
/archives//html/Amps/2009-12/msg00268.html (9,384 bytes)

400. Re: [Amps] Chinese DIN connectors (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Thu, 10 Dec 2009 21:18:51 -0500
Even those are different. There are a number of mini-Din connectors that look "similar" to the standard din *except* they may have a differing pin layout, number of pins, and different size keying. I
/archives//html/Amps/2009-12/msg00291.html (9,642 bytes)

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