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Total 8 documents matching your query.

1. [Amps] Alpha 77Dx two hole (score: 1): Author: Mike Keller <wn1ifo@verizon.net>; Date: Mon, 13 Feb 2017 12:24:40 -0500; Hi, Last week I purchased a 77Dx" from an SK estate. The 3CX1500A7 was the final in my first FM broadcast transmitter, so I have always had soft spot for one. In this case with no ability to test it; /archives//html/Amps/2017-02/msg00079.html (7,537 bytes)
2. Re: [Amps] Alpha 77Dx two hole (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 13 Feb 2017 13:59:54 -0500; The output Pi-L was tapped at the factory for single tube operation. While I'm not 100% sure, I've never seen a Sx version amp tapped any differently than the Dx. If you're inquisitive, you can alwa; /archives//html/Amps/2017-02/msg00080.html (8,738 bytes)
3. Re: [Amps] Alpha 77Dx two hole (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 13 Feb 2017 14:28:38 -0500; This prevents operation on 20 meters and above. have heard that it could be a dried great problem. Any tricks to get free it up or am I in for a teardown? First, check to ensure that the Jennings va; /archives//html/Amps/2017-02/msg00081.html (8,627 bytes)
4. Re: [Amps] Alpha 77Dx two hole (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Mon, 13 Feb 2017 13:34:51 -0600; I agree completely with Paul's comments. I had a 77SX for a few months and didn't care for the amplifier. Best I could tell, it was identical to the 77DX, except for the extra tube and changed multip; /archives//html/Amps/2017-02/msg00082.html (9,751 bytes)
5. Re: [Amps] Alpha 77Dx two hole (score: 1): Author: "Jeff AC0C" <keepwalking188@ac0c.com>; Date: Mon, 13 Feb 2017 13:57:40 -0600; Generically speaking, I don't think the 2nd tube changes the tank tune settings - assuming the same total plate current and the HV is unchanged. What does change is the stray anode capacitance (Cout); /archives//html/Amps/2017-02/msg00083.html (11,261 bytes)
6. Re: [Amps] Alpha 77Dx two hole (score: 1): Author: George <at6c@bellsouth.net>; Date: Mon, 13 Feb 2017 17:18:23 -0600; Paul, Thanks for the tip. I backed out the set screw on the vacuum variable and got a bit more adjustment on the capacitor. This should help on 10M. 73, George W2GS On 2/13/2017 1:28 PM, Paul Christe; /archives//html/Amps/2017-02/msg00085.html (9,529 bytes)
7. [Amps] Alpha 77Dx two hole (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 14 Feb 2017 00:11:43 -0800; Generically speaking, I don't think the 2nd tube changes the tank tune settings - assuming the same total plate current and the HV is unchanged. What does change is the stray anode capacitance (Cout); /archives//html/Amps/2017-02/msg00088.html (10,172 bytes)
8. Re: [Amps] Alpha 77Dx two hole (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Tue, 14 Feb 2017 06:45:41 -0500; Measured with a Millen GDO, self-resonance on the B&W 800 is near 24 MHz. The B&W 802 is better on 12m but I've been replacing the plate choke in my older Alpha amps with the RF Parts RFC3. The stag; /archives//html/Amps/2017-02/msg00090.html (7,509 bytes)

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