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Total 8 documents matching your query.

1. [Amps] 3CX3000 tuned input calibration (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Tue, 24 Oct 2006 18:12:06 -0400; I just added 160 to my 80/40/20 3CX3000A7 amp. It is configured as a Pi-L for the upper bands but I switch the C2 to the other side of L2 for 160M operation using a RB3 Relay. The relay also switches; /archives//html/Amps/2006-10/msg00279.html (7,235 bytes)
2. Re: [Amps] 3CX3000 tuned input calibration (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 24 Oct 2006 19:43:34 -0400; would be necessary. I merely hooked up the 50 resistor to the output of the tuned circuit and fed power to the input and watched the SWR as I adjusted the trimmers(one on each side of the toroid indu; /archives//html/Amps/2006-10/msg00280.html (6,935 bytes)
3. Re: [Amps] 3CX3000 tuned input calibration (score: 1): Author: "Rick Stealey" <rstealey@hotmail.com>; Date: Thu, 26 Oct 2006 14:47:36 +0000; Yes you can use a 50 ohm resistor right across the tuned circuit. I aligned my input circuit this way, using the values from the K8RA amplifier in QST, 20 years ago. It called for 4000 pf capacitors; /archives//html/Amps/2006-10/msg00284.html (8,110 bytes)
4. [Amps] 3CX3000 Tuned Input Calibration (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Thu, 26 Oct 2006 11:09:56 -0400; I have completed the alignment of the tuned input of my 3CX3000A7 using a 50 ohm non-inductive resistor connected between the cathode and ground. I then drove the input with my FT1000 and was able to; /archives//html/Amps/2006-10/msg00285.html (7,473 bytes)
5. Re: [Amps] 3CX3000 Tuned Input Calibration (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 26 Oct 2006 13:34:14 -0400; Don't let anyone tell you slapping a resistor from the output of the network to ground simulates the load by the tube. It doesn't. You initially got lucky Bob. It fell apart on 160 because of the fi; /archives//html/Amps/2006-10/msg00286.html (8,904 bytes)
6. Re: [Amps] 3CX3000 Tuned Input Calibration (score: 1): Author: "Robert B. Bonner" <rbonner@qro.com>; Date: Thu, 26 Oct 2006 12:43:57 -0500; BOB, Sorry I didn't respond to this post earlier, the input impedance of a 3 BY 3 is closer to 35 OHMS if I remember correctly. While this resistor procedure will get you very close it takes tweaking; /archives//html/Amps/2006-10/msg00287.html (9,458 bytes)
7. Re: [Amps] 3CX3000 Tuned Input Calibration (score: 1): Author: "Robert B. Bonner" <rbonner@qro.com>; Date: Thu, 26 Oct 2006 12:51:42 -0500; Yes Tom might be closer with the 60 ohms, I've been working in YC-156's lately, massive B+ hits, brain failures, cellular destruction, beer consumption, standard ham stuff. I've got a couple 3 By 3 p; /archives//html/Amps/2006-10/msg00288.html (9,680 bytes)
8. Re: [Amps] 3CX3000 Tuned Input Calibration (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Sun, 29 Oct 2006 16:56:48 -0500; Not wanting to get involved with cooling problems while adjusting the amp under full steam, I opted to redo the tuned input using 69 ohms from the cathode to ground. I had to shuffle the fixed silver; /archives//html/Amps/2006-10/msg00297.html (10,218 bytes)

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