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41. Re: [Amps] a common topic here tspa (score: 1)
Author: "Joe Subich, K4IK" <k4ik@subich.com>
Date: Wed, 6 Apr 2005 22:19:58 -0400
No, I'm simply saying that the Eimac tube guys that I knew and worked with said a lot of what passes for "truth" is a bunch of nonsense. In their experience, every case of "parasitic problems" in 88
/archives//html/Amps/2005-04/msg00133.html (9,031 bytes)

42. Re: [Amps] a common topic here tspa (score: 1)
Author: "Joe Subich, K4IK" <k4ik@subich.com>
Date: Thu, 7 Apr 2005 08:42:30 -0400
The discussions we had related to bad design in general and not to any specific test fixtures they may have designed. I would, however, expected them to have designed the first test fixtures using a
/archives//html/Amps/2005-04/msg00138.html (9,558 bytes)

43. Re: [Amps] a common topic here tspa (score: 1)
Author: "Joe Subich, K4IK" <k4ik@subich.com>
Date: Fri, 8 Apr 2005 09:38:44 -0400
Some of the 8877 team were still with Eimac in late 1988 - early 1989. The MLA2500 (I had one for several years) is particularly bad for grid overheating not necessarily due to parasitic oscillation
/archives//html/Amps/2005-04/msg00174.html (10,968 bytes)

44. Re: [Amps] Grid resonance (score: 1)
Author: "Joe Subich, K4IK" <k4ik@subich.com>
Date: Fri, 8 Apr 2005 14:50:04 -0400
I suspect .5" is a bit conservative (short) for some of the poor grounding examples I've seen - particularly those that use a series resistor for grid metering. Much more than .5" and I suspect you'
/archives//html/Amps/2005-04/msg00182.html (8,051 bytes)

45. Re: [Amps] a common topic here tspa (score: 1)
Author: "Joe Subich, K4IK" <k4ik@subich.com>
Date: Fri, 8 Apr 2005 17:39:57 -0400
No fooling - and exactly what I've been saying. However, that is not the only reasonable explanation for grid overheating, particularly in a tube known for running excessive grid current when over d
/archives//html/Amps/2005-04/msg00191.html (10,646 bytes)

46. Re: [Amps] Hipersil, the myth and the truth. (Updated) (score: 1)
Author: "Joe Subich, K4IK" <k4ik@subich.com>
Date: Mon, 18 Apr 2005 09:14:21 -0400
I'm only speculating but is it possible that the difference is the orientation of the core? Since the C-core is wound, the laminations are radial vs. a perpendicular orientation in the EI-core. It h
/archives//html/Amps/2005-04/msg00360.html (8,365 bytes)

47. Re: [Amps] Fwd:Re: More Rumors (score: 1)
Author: "Joe Subich, K4IK" <k4ik@subich.com>
Date: Fri, 22 Apr 2005 11:16:25 -0400
I'd be interested in that info, too. It looks like Advanced Power Technology has some 300 volt VDMOS FETs that do 750 watts in modes A-E (ARF1505). A push-pull pair of them would be very close to le
/archives//html/Amps/2005-04/msg00441.html (8,788 bytes)

48. Re: [Amps] Bleeder Resistor Inquiry (score: 1)
Author: "Joe Subich, K4IK" <k4ik@subich.com>
Date: Sun, 24 Apr 2005 10:23:43 -0400
Mike, Your bleeder resistor is too small. 4000 volt transformer with fullwave bridge should produce at least 5600 volts no load. 5600 volts across 100K -> 56 ma 56 ma * 56 ma * 100K = 313.6 watts 313
/archives//html/Amps/2005-04/msg00474.html (9,025 bytes)

49. Re: [Amps] Shorting Sticks (score: 1)
Author: "Joe Subich, K4IK" <k4ik@subich.com>
Date: Sun, 24 Apr 2005 19:30:17 -0400
Amen! I remember working on a TV transmitter a few years ago ... Had a 30 KV power supply in which the B+ was grounded through a metering resistor and the B- tied to the cathode (typical for a klyst
/archives//html/Amps/2005-04/msg00502.html (9,653 bytes)

50. Re: [Amps] Input Circuit (score: 1)
Author: "Joe Subich, K4IK" <k4ik@subich.com>
Date: Sat, 28 May 2005 12:01:47 -0400
A grounded grid amplifier does not represent a constant load to the driving stage, it will vary from very high when the tube is cut off to quite low (a few ohms) at maximum anode current. Although th
/archives//html/Amps/2005-05/msg00314.html (8,195 bytes)

51. Re: [Amps] Kilovac HC-1 vacuum relay source (score: 1)
Author: "Joe Subich, W4TV" <k4ik@subich.com>
Date: Wed, 22 Jun 2005 17:57:23 -0400
www.msg4u.com 73, ... Joe, W4TV (ex K4IK) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2005-06/msg00183.html (8,007 bytes)

52. Re: [Amps] Alpha 86 PIN Diode Fuse (score: 1)
Author: "Joe Subich, W4TV" <k4ik@subich.com>
Date: Thu, 14 Jul 2005 18:28:38 -0400
As one who helped Doc Sheller design and build the DEO-1500 back in the early 80's ... The DEO-1500 "fuse" is a standard light bulb - Chicago Miniature it should blow is if the transceiver is generat
/archives//html/Amps/2005-07/msg00160.html (10,911 bytes)

53. Re: [Amps] Best way to tune a Dentron ML2500 ? (score: 1)
Author: "Joe Subich, W4TV" <k4ik@subich.com>
Date: Sun, 31 Jul 2005 22:34:16 -0400
You've got to be kidding - 333ma is nearly the rated PLATE current! Eimac recommended a grid current trip at less than 100 ma for the 8877 which has a significantly larger grid than the 8873/8874/887
/archives//html/Amps/2005-07/msg00383.html (8,396 bytes)

54. Re: [Amps] Best way to tune a Dentron ML2500 ? (score: 1)
Author: "Joe Subich, W4TV" <k4ik@subich.com>
Date: Tue, 2 Aug 2005 10:07:14 -0400
OK ... it's half the rated plate current (Svetlana spec sheet for their 3CX400/8874 is 350 mA plate current). Still, there is absolutely no way the 8873/8874/8875 will survive 150 mA of grid current
/archives//html/Amps/2005-08/msg00047.html (8,567 bytes)

55. Re: [Amps] FW: AMERITRON AL-1500 ???? (score: 1)
Author: "Joe Subich, W4TV" <k4ik@subich.com>
Date: Sun, 7 Aug 2005 12:57:55 -0400
Jose, The AL-1500 has a slightly undersize output circuit and may melt the coil if you try to run "full soup" on RTTY. Other than that - as you have noticed - it is a relatively good value for the mo
/archives//html/Amps/2005-08/msg00243.html (10,152 bytes)

56. Re: [Amps] FW: AMERITRON AL-1500 ???? (score: 1)
Author: "Joe Subich, W4TV" <k4ik@subich.com>
Date: Sun, 7 Aug 2005 15:31:58 -0400
Slip of the fingers ... If the grid is capable of safely handling 350 mA, why does Eimac say 74 mA single tone and 25 mA two tone grid current at 3500 Vp? Why do they say 10 mA with 2500 Vp at 220 M
/archives//html/Amps/2005-08/msg00252.html (9,379 bytes)

57. Re: [Amps] Suggestions for new Alpha Owner? (score: 1)
Author: "Joe Subich, W4TV" <k4ik@subich.com>
Date: Tue, 27 Sep 2005 18:54:54 -0400
Absolutely WRONG!!!! The Alpha amplifiers in the 76, 78, 374, etc series were intentionally designed with a choke resonance around 25 MHz to prevent their use on 27 MHz. This information comes direct
/archives//html/Amps/2005-09/msg00340.html (8,199 bytes)

58. Re: [Amps] QSK from FT1000MP to QRO HF-2500DX (score: 1)
Author: "Joe Subich, W4TV" <k4ik@subich.com>
Date: Mon, 31 Oct 2005 09:37:22 -0500
Nick, Here is all the information you need: http://www.qsl.net/n1eu/Yaesu/MPAcom.htm Note the DIN-8 on the FT-1000MP is a lesser known standard. You will need a DIN8/262 available from the RF Connect
/archives//html/Amps/2005-10/msg00716.html (8,800 bytes)

59. Re: [Amps] Anode Impedance of 4-400A (score: 1)
Author: "Joe Subich, W4TV" <k4ik@subich.com>
Date: Tue, 15 Nov 2005 19:22:02 -0500
Phil, What class of operation, A, AB1, AB2, B or C and what conduction angle if class C? The 1.8 factor is an averaging factor based on conduction angle. For example, class A will be Ep/Ip while a si
/archives//html/Amps/2005-11/msg00201.html (10,018 bytes)

60. Re: [Amps] Conversation stopper? (score: 1)
Author: "Joe Subich, W4TV" <k4ik@subich.com>
Date: Sat, 19 Nov 2005 21:25:45 -0500
Actually, Dr. Schmidt has a point ... those with software that puts **SPAM** in the subject line of reflector massages and don't edit it out on replies are *VERY* inconsiderate of the other reflector
/archives//html/Amps/2005-11/msg00357.html (10,588 bytes)

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