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References: [ +from:W4EF@dellroy.com: 326 ]

Total 326 documents matching your query.

321. Re: [Amps] Acceptable SWR for Tube Amps (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Mon, 17 Feb 2025 10:35:53 -0800
Thank you for this info, Peter. I was presuming that Lukasz question pertained to the case of remote operation where a fixed preset was used without adjustment at different levels of VSWR (like you m
/archives//html/Amps/2025-02/msg00007.html (12,360 bytes)

322. Re: [Amps] Paralleling plate xfmrs. (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Mon, 27 Oct 2025 06:47:47 -0700
I was curious about this so I did a real quick simulation in LTspice. When you parallel transformer secondaries with a small imbalance in secondary voltage, there is an inverse relationship between c
/archives//html/Amps/2025-10/msg00021.html (18,740 bytes)

323. Re: [Amps] Paralleling plate xfmrs. (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Mon, 27 Oct 2025 17:53:01 -0700
Hi Jim, Hmm, ignoring the impact of primary resistance, a 19.09 ohms secondary resistance could (in theory) lead to a current imbalance of 0.96 amps with an 18.4 volt difference in secondary voltage.
/archives//html/Amps/2025-10/msg00026.html (10,581 bytes)

324. Re: [Amps] Paralleling plate xfmrs. (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Tue, 28 Oct 2025 19:45:52 -0700
Yeah, based on the numerous examples you cite, Jim, and the LTspice simulations, I am convinced that paralleling can work, but that there will always be at least some current imbalance. Whether or no
/archives//html/Amps/2025-10/msg00028.html (9,999 bytes)

325. [Amps] Alpha 87A Auto Band-Switching (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Mon, 2 Mar 2026 03:30:53 -0800
One of my Alpha 87A has a problem with the frequency counter that is used by the amplifier to automatically switch bands based on the frequency of the input signal. Normally this is a desirable featu
/archives//html/Amps/2026-03/msg00000.html (7,401 bytes)

326. Re: [Amps] Alpha 87A Auto Band-Switching (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Tue, 3 Mar 2026 00:21:05 -0800
I discovered that if you turn the potentiometer R20 in the frequency counter portion of the Input T/R PWB (Assy ABX-X182) fully clockwise,  it disables the frequency counter and auto band-switching t
/archives//html/Amps/2026-03/msg00002.html (8,930 bytes)

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