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1. [Amps] Neutralizing Dentrons (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sun, 25 Jun 2006 16:17:31 -0400; The most difficult to stabilize tubes are generally those with the longest and thinnest element leads. The 811/572 family falls into this category. If you look at older amps like the Heath Warrior an; /archives//html/Amps/2006-06/msg00391.html (7,712 bytes)
2. Re: [Amps] Neutralizing Dentrons (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sun, 25 Jun 2006 17:55:59 -0400; Not for the reasons you gave. 1.) Heath and Gonset did not make any more four parallel tube amps using tubes with high feedthrough capacitance. They had no reason to put it in other amps. 2.) The pa; /archives//html/Amps/2006-06/msg00398.html (7,357 bytes)
3. Re: [Amps] Neutralizing Dentrons (score: 1): Author: R L Measures <r@somis.org>; Date: Sun, 25 Jun 2006 13:49:39 -0700; After producing the Warrior and the GSB-201, finding that even though the RCA Tube Manual's "neutralization" circuit deceased feedback at HF, due to phase shifting as freq shifted, they came to reali; /archives//html/Amps/2006-06/msg00402.html (7,837 bytes)
4. Re: [Amps] Neutralizing Dentrons (score: 1): Author: R L Measures <r@somis.org>; Date: Sun, 25 Jun 2006 16:21:47 -0700; So phase shift remains constant no matter how much freq. increases? Valid point, Tom, but Heath used the 572B in a subsequent amplifier and they chose not to use RCA's g-g "neutralization" circuit. O; /archives//html/Amps/2006-06/msg00406.html (9,004 bytes)
5. Re: [Amps] Neutralizing Dentrons (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sun, 25 Jun 2006 19:39:07 -0400; What four tube amp was that Rich? I can't seem to recall it even though I did various RF designs for Heath. Who at Heath told you they chose not to use it for the reasons you mentioned? ____________; /archives//html/Amps/2006-06/msg00407.html (7,627 bytes)

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