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Total 87 documents matching your query.

1. [Amps] 8877 cathode impedance (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Mon, 26 Nov 2012 19:36:21 -0500
Hello all, Want to re-do the input matching of an old HB 8877 amp. What should I use for the cathode impedance when calculating my pi network? I recall it was something like 50-60 ohms. Also, thinkin
/archives//html/Amps/2012-11/msg00178.html (7,511 bytes)

2. Re: [Amps] original thread: Peter Dahl transformers, remark about capacitors for switching supplies (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Wed, 3 Apr 2013 18:44:48 -0400
Carl, and company, Can you bypass the cold end of a RF choke too much? Say, I put 6 or 8 - .0047 pf caps in parallel to carry the RF current. And, the plate coke is 180 mh and it's on 160. What would
/archives//html/Amps/2013-04/msg00011.html (11,800 bytes)

3. Re: [Amps] Non-vacuum capacitor (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Mon, 29 Apr 2013 10:25:59 -0400
Hello all, My wife has a woman working for her at her art gallery that is also an experienced 'glass artisan', or whatever the name is, and I asked her about working with the glass vac variables. She
/archives//html/Amps/2013-04/msg00243.html (9,862 bytes)

4. Re: [Amps] Rubber Mats ( was Direct rectification of AC mains to drive the amp, ) (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Mon, 7 Oct 2013 18:24:38 -0400
Along a similar line... I fought poor performing Beverage antennas for abt 2 years, before I found the problem. The black plastic boxes I used to house the transformers at the antenna feed were condu
/archives//html/Amps/2013-10/msg00112.html (11,270 bytes)

5. Re: [Amps] GIVE IT A BREAK! (Subject change from:Commander HF-1250 problem) (score: 1)
Author: Steve NR4M <steve@nr4m.com>
Date: Wed, 20 Nov 2013 19:37:37 +0000
I agree with Mark 100% Don't know the background, so I'm not taking sides. I just don't want to hear this petty bickering from anyone. Have an issue with someone? Take it OFF the reflector. 73 de Ste
/archives//html/Amps/2013-11/msg00394.html (10,947 bytes)

6. [Amps] Meters for HB amps? (score: 1)
Author: Steve NR4M <steve@nr4m.com>
Date: Fri, 27 Dec 2013 17:28:43 +0000
Hello all, Looking for analog meters f/u/w the current amp I am building, and for any in the future. I have done quite a bit of searching on the Internet and really haven't found quite what I think I
/archives//html/Amps/2013-12/msg00150.html (7,319 bytes)

7. [Amps] Meters (score: 1)
Author: Steve NR4M <steve@nr4m.com>
Date: Mon, 30 Dec 2013 14:52:49 +0000
Hello all, Thanks for all the excellent input on where to find meters. I have about 4 good choices, including a couple of offers from people on the list. I appreciate the input. -- 73 de Steve, NR4M
/archives//html/Amps/2013-12/msg00181.html (6,707 bytes)

8. [Amps] Meters again... (score: 1)
Author: Steve NR4M <steve@nr4m.com>
Date: Mon, 30 Dec 2013 14:59:26 +0000
Another thing. Several of you mentioned the 'Meters' program used to create your own custom meter faces. I have been using this for quite a while and find it super useful and I highly recommend it. -
/archives//html/Amps/2013-12/msg00182.html (6,717 bytes)

9. Re: [Amps] Tube swap (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Mon, 27 Jan 2014 22:17:54 -0500
I think most people would use something called a high potential tester AKA 'HI-POT' tester. It allows you to put a variable high voltage across your tube from various pin combinations. There is a hig
/archives//html/Amps/2014-01/msg00263.html (15,059 bytes)

10. [Amps] where to get TL-922 fil xfrmer rewound? (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Tue, 22 Apr 2014 17:53:06 -0400
Hello all, A friend had the filament transformer in his TL-922 fail. He asked me if I knew of anyone rewinding them. I told him I'd ask here. If he can't find anyone, I suppose he can either look for
/archives//html/Amps/2014-04/msg00199.html (6,812 bytes)

11. [Amps] Source for replacement PS caps (score: 1)
Author: Steve NR4M <steve@nr4m.com>
Date: Fri, 10 Oct 2014 18:42:53 +0100
Hello all, Figured it was time to re-cap the PS for my Ten-Tec since they are about 25 years old. The amp hasn't been used in a while so you just know what will happen if I DON'T re-cap it before I u
/archives//html/Amps/2014-10/msg00036.html (7,407 bytes)

12. Re: [Amps] Source for replacement PS caps (score: 1)
Author: Steve NR4M <steve@nr4m.com>
Date: Fri, 10 Oct 2014 20:16:40 +0100
Thanks for the input, Dave. Been looking around and, they're a non-stocked item, like you said, or they're big $$. I have a bunch of much shorter, snap-in caps, which I've used in the past with good
/archives//html/Amps/2014-10/msg00038.html (9,497 bytes)

13. [Amps] SOURCE FOR 3CX800'S (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Tue, 14 Oct 2014 18:31:36 -0400
Hello all, Recently picked up an older Alpha and was thinking of making the conversion to a pair of 3cx800's from the 3 x 8874's which are in the amp. Any suggestions on a source for good 3cx800 pull
/archives//html/Amps/2014-10/msg00059.html (6,353 bytes)

14. [Amps] Thanks... (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Thu, 16 Oct 2014 18:52:33 -0400
... for all the good info on finding 3cx800 tubes. These tubes (8874's) are making good power, so I think I will wait until I really NEED to do a conversion. 73 de Steve, NR4M _______________________
/archives//html/Amps/2014-10/msg00097.html (6,236 bytes)

15. Re: [Amps] GU84b tubes (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Fri, 30 Jan 2015 02:50:04 +0000
What do you get if you spend 31 secs? www.ur4ll.net? 30 seconds with Google gives www.urrll.net 73, ... Joe, W4TV --Original Message-- From: Behiels jean-Pierre Sent: Thursday, January 29, 2015 7:33
/archives//html/Amps/2015-01/msg00374.html (8,424 bytes)

16. [Amps] high drive/low output QRO HF-2500 (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Thu, 19 Feb 2015 23:22:10 +0000
Hello all, Took a QRO HF-2500 out of storage and put it on my 40 meter mult station. Tuned by the book (because I never can remember how to tune this thing without the book...) and the output is low
/archives//html/Amps/2015-02/msg00118.html (6,948 bytes)

17. Re: [Amps] high drive/low output QRO HF-2500 (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Fri, 20 Feb 2015 00:40:22 +0000
The K3 that is driving it shows 1.2 or 1.3 to 1 standing wave. Steve On 2/20/2015 00:31 , TexasRF@aol.com wrote: 90W drive; how much reflected? 73, K5GW In a message dated 2/19/2015 5:22:23 P.M. Cent
/archives//html/Amps/2015-02/msg00120.html (8,142 bytes)

18. Re: [Amps] high drive/low output QRO HF-2500 (score: 1)
Author: Steve NR4M <steve@nr4m.com>
Date: Mon, 02 Mar 2015 20:43:55 +0000
Hi Carl, and others, My apologies for taking so long to get back you everyone on this. 'Life' got in the way. I got the amp moved over to another position and put the output into a dummy load. Drivin
/archives//html/Amps/2015-03/msg00004.html (10,875 bytes)

19. Re: [Amps] high drive/low output QRO HF-2500 (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Mon, 02 Mar 2015 21:23:10 +0000
As in open filament? Wouldn't that affect the plate load impedance, tank settings? I once had a hb pair of 4-400's in which one plate lead broke. The one tube was cherry red and meter needles flying
/archives//html/Amps/2015-03/msg00006.html (12,864 bytes)

20. Re: [Amps] high drive/low output QRO HF-2500 (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Mon, 02 Mar 2015 21:33:52 +0000
With both rigs the input showed low SWR. 40m on the K3 and 40 and 20m with the Omni. I guess the next thing is to swap out the tubes, one at a time. Steve That amp is notorious for frying input circu
/archives//html/Amps/2015-03/msg00008.html (13,057 bytes)


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