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1. Re: [Amps] Blower of om2500hf? (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Tue, 07 Apr 2009 09:19:38 -0700
ORIGINAL MESSAGE: REPLY: I can't answer your first question, but I can recommend an excellent blower. I am using an EBM-Pabst model G2E108-AA05-44 in my 8877 amp and I highly recommend it. This one i
/archives//html/Amps/2009-04/msg00080.html (7,639 bytes)

2. Re: [Amps] HV supply question (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Wed, 08 Apr 2009 09:36:39 -0700
ORIGINAL MESSAGE: REPLY: It is done for purposes of metering. In the olden days, the plate meter was put in the B+ lead, a very unsafe practice since it puts the entire B+ voltage on the meter itself
/archives//html/Amps/2009-04/msg00084.html (8,436 bytes)

3. [Amps] Silver plating (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Wed, 08 Apr 2009 19:38:29 -0700
Does anyone here have any before and after comparisons of silver plating HF tank coils? It seems most of the commercial amateur amp makers do it but I have never seen any specific data. All comments
/archives//html/Amps/2009-04/msg00088.html (7,127 bytes)

4. Re: [Amps] Silver plating (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Wed, 08 Apr 2009 21:07:41 -0700
ORIGINAL MESSAGE: REPLY: Thanks Roger. I have a 1500 watt amp with a ten meter tank coil wound with #6 solid copper wire. After about 30 seconds key down CW the coil is uncomfortably hot to the touch
/archives//html/Amps/2009-04/msg00093.html (8,552 bytes)

5. Re: [Amps] Silver plating (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Wed, 08 Apr 2009 21:39:31 -0700
ORIGINAL MESSAGE: REPLY: Very interesting, good info. Thanks! I think I'll leave my copper coils well enough alone. I will watch the efficiency however, and if it starts to fall off on ten meters, I
/archives//html/Amps/2009-04/msg00096.html (8,520 bytes)

6. Re: [Amps] Silver plating (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Wed, 08 Apr 2009 21:43:45 -0700
ORIGINAL MESSAGE: REPLY: I just might try that. The coils in my amp are all screw-mounted so removing one and installing a heavier one is easy. Thanks for the info. 73, Bill W6WRT ___________________
/archives//html/Amps/2009-04/msg00098.html (8,552 bytes)

7. Re: [Amps] Silver plating (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Thu, 09 Apr 2009 01:15:02 -0700
ORIGINAL MESSAGE: REPLY: Agreed, I don't think cleaning would change it at all. What it would change is the I-squared-R loss due to copper oxide. I made a mental note of the DC input vs RF output and
/archives//html/Amps/2009-04/msg00102.html (8,510 bytes)

8. Re: [Amps] New GS-35B amplifier.. (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sat, 11 Apr 2009 22:09:15 -0700
ORIGINAL MESSAGE: REPLY: It sounds like something is breaking down somewhere. I had a similar problem once that turned out to be the little RF choke which is placed across the output of the pi-net fo
/archives//html/Amps/2009-04/msg00134.html (8,491 bytes)

9. Re: [Amps] Power supply question (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sun, 12 Apr 2009 03:01:39 -0700
ORIGINAL MESSAGE: REPLY: I think this is incorrect. it is true the voltage across each cap can not fall below the individual supply voltage, but it can go above it. Equalization resistors are still n
/archives//html/Amps/2009-04/msg00139.html (7,339 bytes)

10. Re: [Amps] multiple supplies in series (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sun, 12 Apr 2009 16:55:15 -0700
ORIGINAL MESSAGE: REPLY: A suitable driver for the Poisson 'D Avril Contest, no doubt. Tell us about the final. :-) 73, Bill W6WRT _______________________________________________ Amps mailing list Am
/archives//html/Amps/2009-04/msg00145.html (7,176 bytes)

11. Re: [Amps] new GS-35B amplifier. (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Wed, 15 Apr 2009 09:40:58 -0700
ORIGINAL MESSAGE: REPLY: Glad you got it working! Congratulations. I am a little concerned about the efficiency, however. If I'm doing the math right, the efficiency at the 1000 watt level is only ab
/archives//html/Amps/2009-04/msg00156.html (7,721 bytes)

12. Re: [Amps] Power Supply Question (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Wed, 15 Apr 2009 09:44:44 -0700
ORIGINAL MESSAGE: REPLY: You need to be careful when putting the secondaries in series with the primaries in parallel. Depending on how the rectifier part is wired you might exceed the voltage rating
/archives//html/Amps/2009-04/msg00157.html (8,029 bytes)

13. Re: [Amps] screen grid current question on gu-84b (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sat, 18 Apr 2009 06:18:11 -0700
ORIGINAL MESSAGE: REPLY: It sounds ok so far. I have not used a GU-84b but I have used a 4CX1000A and they should be similar. With zero drive, the screen current is a little negative. With increasing
/archives//html/Amps/2009-04/msg00165.html (7,756 bytes)

14. Re: [Amps] screen grid current question on gu-84b (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sat, 18 Apr 2009 17:22:03 -0700
ORIGINAL MESSAGE: REPLY: Good point. I forgot to mention that while an Eimac and a Taylor 4CX1000A both tuned in the same general manner, the Eimac showed much greater negative screen current than th
/archives//html/Amps/2009-04/msg00167.html (7,414 bytes)

15. Re: [Amps] tank calculations - MFJ analizer - resistor (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Tue, 21 Apr 2009 09:21:43 -0700
ORIGINAL MESSAGE: REPLY: Definitely leave the tube in - it is part of the tune capacitance, in parallel with the "real" tune capacitor. Here's how I do it: 1. Using the ARRL handbook or a spreadsheet
/archives//html/Amps/2009-04/msg00181.html (8,970 bytes)

16. Re: [Amps] Help needed with: driving TITAN 425s with K3's (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Tue, 21 Apr 2009 09:27:46 -0700
ORIGINAL MESSAGE: REPLY: A tuner between the K3 and the Titan should do the trick. A totally automatic one would be most convenient. LDG makes several models: http://www.ldgelectronics.com/ And I'm s
/archives//html/Amps/2009-04/msg00182.html (7,840 bytes)

17. Re: [Amps] SB-1000 tuning question (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Wed, 22 Apr 2009 11:53:41 -0700
ORIGINAL MESSAGE: REPLY: I have an SB-1000 that had a defective padder capacitor brand new right out of the box. This is the little doorknob type cap. The screw connection is soldered to the ceramic
/archives//html/Amps/2009-04/msg00208.html (7,772 bytes)

18. Re: [Amps] High SWR (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Wed, 22 Apr 2009 16:44:41 -0700
ORIGINAL MESSAGE: REPLY: I would pre-buy an XL size coffin and tell the kids to put it in there with me. :-) 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@cont
/archives//html/Amps/2009-04/msg00219.html (7,617 bytes)

19. Re: [Amps] High SWR (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Wed, 22 Apr 2009 16:53:23 -0700
ORIGINAL MESSAGE: REPLY: I agree up to a point. The main villain with SWR, IMO, isn't loss, it is the excess voltage present on the line. Most coax, even the RG-213 size, is rated for only 600 volts.
/archives//html/Amps/2009-04/msg00220.html (7,748 bytes)

20. Re: [Amps] High SWR (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Wed, 22 Apr 2009 18:44:21 -0700
ORIGINAL MESSAGE: REPLY: You are correct, I should not have included RG-213 in my comment. However, the other same-sized coaxes like Times LMR-400, Belden 9913 and most varieties of RG-8 are rated at
/archives//html/Amps/2009-04/msg00227.html (8,550 bytes)

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