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Total 573 documents matching your query.

281. Re: [Amps] Glitch resistor + fuse? (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Wed, 15 Nov 2017 19:08:03 -0600
I'm pretty sure they are .82 Ohms at 2 watts. There are lots of them on EBay for free shipping and small quantities. 73 Jim W7RY <The Tentec Titan amp uses a single 10 ohm 25watt ohmite. <Doug will w
/archives//html/Amps/2017-11/msg00156.html (10,301 bytes)

282. Re: [Amps] Glitch resistor + fuse? (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Wed, 15 Nov 2017 19:13:32 -0600
Whoa... I guess EBay doesn't have them listed anymore... But Harbach has some. https://harbachelectronics.com/shop/drake/res-400-5-pack-of-hv-safety-resistors/ 73 Jim W7RY I'm pretty sure they are .8
/archives//html/Amps/2017-11/msg00157.html (10,219 bytes)

283. Re: [Amps] Glitch resistor + fuse? (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Thu, 16 Nov 2017 06:05:16 -0600
I've never had a wire wound glitch resistor "fail" during normal operation. 10 watt or 25 watt, HV or 120/240 VAC. 73 Jim W7RY Maybe someone already covered this, but I stay away from using wirewound
/archives//html/Amps/2017-11/msg00159.html (9,072 bytes)

284. Re: [Amps] Henry 2K-3 amp restore (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Tue, 21 Nov 2017 11:05:47 -0600
Diodes on meters wont help much. They will be destroyed by .7 volts which is were a diode conducts. Sounds like a bad T/R relay. Clean it up with some de-oxit and some rough paper or a crisp dollar b
/archives//html/Amps/2017-11/msg00178.html (12,514 bytes)

285. Re: [Amps] Alpha 9500 Relays Needed (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Thu, 23 Nov 2017 08:46:18 -0600
Hard to believe you had to pay $650.00 for one... See below. 73 Jim W7RY NEWS For Immediate Release: June 11, 2004 For more information contact: Pat McPherson VP Marketing GIGAVAC PO Box 4428 Santa B
/archives//html/Amps/2017-11/msg00199.html (9,573 bytes)

286. [Amps] 572Bs Needed (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Tue, 28 Nov 2017 11:25:51 -0600
Looking for a pair of 572Bs. Used are fine as long as they are good Cetron. Going into a SB200 (80-10 meters) What brand seems to be holding up if I cant find and used Cetrons? Thanks 73 Jim W7RY ___
/archives//html/Amps/2017-11/msg00215.html (6,250 bytes)

287. Re: [Amps] Sick SB220 (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Fri, 1 Dec 2017 17:36:55 -0600
I just saw one on QTH.com 73 Jim W7RY Thanks for the add. I am looking for sources for the Filament / Bias transformer for the SB220 Thanks De Mike N5KB ______________________________________________
/archives//html/Amps/2017-12/msg00001.html (6,997 bytes)

288. Re: [Amps] Sick SB220 (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Mon, 4 Dec 2017 17:45:24 -0600
W7RY makes some step start boards, QSK and diode/metering boards for the SB220. They will be back on eBay at the end of the week. 73 Jim W7RY There is/was a company in USA the have upgrade kits for H
/archives//html/Amps/2017-12/msg00020.html (8,585 bytes)

289. Re: [Amps] Here's a new one for me that I'd like to share (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Tue, 5 Dec 2017 12:07:46 -0600
A vacuum cleaner motor also speeds up when you plug the suction or the discharge. That's the nature of a blower. Remove the load (moving air) and it speeds up. 73 Jim W7RY --Original Message-- From:
/archives//html/Amps/2017-12/msg00031.html (10,728 bytes)

290. Re: [Amps] Stuck setscrews (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Fri, 8 Dec 2017 09:31:33 -0600
I'm sure a search for "softening lock-tight" will lead you to the proper solvent... 73 Jim W7RY --Original Message-- From: Victor Rosenthal 4X6GP Sent: Friday, December 08, 2017 7:43 AM To: Alek Petk
/archives//html/Amps/2017-12/msg00064.html (9,451 bytes)

291. Re: [Amps] 572Bs Needed (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Mon, 11 Dec 2017 21:23:25 -0600
Got them all installed. They work GREAT! 850 watts out on 40 meters with 90 watts drive. On 120 volts. SB-200 73 Jim W7RY Ordered a set from RF Parts. Now If they will just get on the road because of
/archives//html/Amps/2017-12/msg00082.html (7,958 bytes)

292. Re: [Amps] NXP 65V LDMOS 1K80H-1800W (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Sun, 24 Dec 2017 20:24:28 -0600
How much for an 8877? https://www.ebay.com/itm/3CX1500A7-New-RLM-MICROWAVE-Full-Power-Out-Guaranteed-Buy-It-Now-325/322954029006?hash=item4b318f67ce:g:4QkAAOSwj99Z9Vzx 73 Jim W7RY Merry Christmas Wha
/archives//html/Amps/2017-12/msg00147.html (12,162 bytes)

293. Re: [Amps] NXP 65V LDMOS 1K80H-1800W (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Sun, 24 Dec 2017 20:30:02 -0600
How much for an 8877? And this is a 3CPX1500! https://www.ebay.com/itm/3CPX1500A7-NEW-RLM-MICROWAVE-Special-Red-Series-Buy-it-NOW-375-World-Ship-65/192407593638?_trkparms=aid%3D222007%26algo%3DSIM.MB
/archives//html/Amps/2017-12/msg00149.html (12,368 bytes)

294. Re: [Amps] NXP 65V LDMOS 1K80H-1800W (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Sun, 24 Dec 2017 20:53:43 -0600
I can think of one company making a CCS rated tube final amp (Alpha) and they are hanging on by a thumb nail with their $6K amplifier. The 9500 won't do CCS RTTY or FM at 1500 watts without auxiliary
/archives//html/Amps/2017-12/msg00151.html (8,143 bytes)

295. Re: [Amps] Life of tubes in ham service - Correction (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Tue, 26 Dec 2017 19:23:13 -0600
A simple resistor in series with the filament transformer and shorted by a relay after a second or two is MUCH easier. 73 Jim W7RY Correction: Should have said fig 5 on page 7. The heater regulator l
/archives//html/Amps/2017-12/msg00164.html (9,386 bytes)

296. Re: [Amps] Soft Start (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Tue, 26 Dec 2017 20:59:49 -0600
I recommend 10 Ohms. I use 2 resistors and 2 relays. There are fuses in series with the resistors to protect them. Why would a cap blowing up cause an issue with a step start circuit? Again, I use 2
/archives//html/Amps/2017-12/msg00166.html (8,313 bytes)

297. Re: [Amps] Soft Start (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Wed, 27 Dec 2017 06:25:27 -0600
Soft start (I call it step start) does reduce filament inrush current. As long as it's on the filament transformer primary. Which it is in the SB200, SB220, TL922, L4B and TenTec Titan... And many ot
/archives//html/Amps/2017-12/msg00170.html (10,851 bytes)

298. Re: [Amps] Life of tubes in ham service (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Wed, 27 Dec 2017 20:46:57 -0600
They were probably Burle brand? They were famous for pink ceramic. RCA made a few too. 73 Jim W7RY If the HV hasnt been recapped with over 25-30 uF total that transformer or winding is also a good in
/archives//html/Amps/2017-12/msg00177.html (16,315 bytes)

299. Re: [Amps] Life of tubes in ham service (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Fri, 29 Dec 2017 19:46:25 -0600
Lots of Teflon and silicone on eBay. I have also successfully used turbo charger hose. Buy it by the inch. I use it on my 3CX800 amplifier. It's silicone sheet with a cloth cover. Used to connect the
/archives//html/Amps/2017-12/msg00189.html (12,679 bytes)

300. Re: [Amps] Life of tubes in ham service (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Fri, 29 Dec 2017 19:47:34 -0600
Oh... And I have used small screws, (2-56) and nuts to hold Teflon sheet together for tube chimneys. 73 Jim W7RY Happy New Year! Lots of Teflon and silicone on eBay. I have also successfully used tur
/archives//html/Amps/2017-12/msg00190.html (12,613 bytes)

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