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61. Re: [Amps] How to read the 3-500Z spec sheet? (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sun, 23 May 2010 09:11:19 -0500
you say you are getting 400 w. with 520 ma Ip. I think that's 120 ma over the max Ip for a single 3-500 so you're possibly in trouble right there. you say you increase drive and get no more suds whic
/archives//html/Amps/2010-05/msg00323.html (10,286 bytes)

62. Re: [Amps] How to read the 3-500Z spec sheet? (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sun, 23 May 2010 13:15:40 -0500
Hi Lou, I saw ur setup at Dayton but I didn't have time to stop and say hello. Sorry about that but I'll make a point to do so next year. A few points: I don't know what Rauch did or didn't do--for o
/archives//html/Amps/2010-05/msg00333.html (14,542 bytes)

63. Re: [Amps] HV connectors (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Tue, 25 May 2010 11:30:16 -0500
I spent some time thinking about h.v. cable and connectors between the p.s. and RF deck of my amp project and decided the best way to deal with it is to get a bigger cabinet and not have a separate p
/archives//html/Amps/2010-05/msg00400.html (8,314 bytes)

64. Re: [Amps] T/R Relays ? (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sun, 6 Jun 2010 22:04:33 -0500
You say you have some delay set to 300 ms to eliminate relay chatter. I don't think delay has anything to do with that. I've always thought relay chatter in an amp is due to RF getting into the relay
/archives//html/Amps/2010-06/msg00061.html (7,467 bytes)

65. Re: [Amps] Centurion Ip no drive (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Thu, 10 Jun 2010 12:12:01 -0500
Okay, if I understand the situation correctly, when you place the amp in "operate" (as opposed to "standby") and key it into transmit, you see ~175 ma Ip with no drive. Normally with pair Chinese 3-5
/archives//html/Amps/2010-06/msg00108.html (7,887 bytes)

66. Re: [Amps] Peter Dahl / Harbach SB-220 transformer (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sat, 12 Jun 2010 20:43:13 -0500
Last time I looked at Jeff's ham tran. list at least one thing was missing, the Dahl replacement for the Ten Tec Centurion stock h.v. transformer, which is a shame since the Dahl replacement was mor
/archives//html/Amps/2010-06/msg00159.html (8,988 bytes)

67. Re: [Amps] parasitic suppressor voodoo (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Thu, 15 Jul 2010 12:40:27 -0500
I would love to know what if any p.s. is needed on a pair 4-1000A at 4.5 KV triode connected cathode driven for 160, 75 and 40 m. rob K5UJ _______________________________________________ Amps mailing
/archives//html/Amps/2010-07/msg00124.html (6,891 bytes)

68. Re: [Amps] parasitic suppressor voodoo (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Thu, 15 Jul 2010 17:45:32 -0500
Okay! From Carl and Dave's lips to God's ears, or is it the other way around. The authorities have spoken and I now proceed with confidence.... tnx Rob K5UJ p.s. to the original poster--pse accept my
/archives//html/Amps/2010-07/msg00130.html (10,844 bytes)

69. Re: [Amps] parasitic suppressor voodoo (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Thu, 15 Jul 2010 22:10:11 -0500
Got it. I don't plan to use them above 7 MHz. I also got the plastic sockets per your suggestion. Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http:/
/archives//html/Amps/2010-07/msg00141.html (13,652 bytes)

70. [Amps] can not seem to choke the question (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Fri, 30 Jul 2010 10:58:24 -0500
I am enjoying the exchanges. I just purchased four 50 ohm 20 w. globars based on what I learned here. They are about 1.5 inch long and 0.5 inch o.d. I will cut a 1/4 inch wide strip of copper strap a
/archives//html/Amps/2010-07/msg00350.html (7,741 bytes)

71. [Amps] watt meter suggestion (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Wed, 11 Aug 2010 10:58:28 -0500
Thermocouple RF amp meter (one reading up to around 6 A should be okay) in series to 50 ohm dummy load. Measure DL Z first. Knowing that measure RF current with CW carrier. Observe wave on scope and
/archives//html/Amps/2010-08/msg00145.html (7,252 bytes)

72. Re: [Amps] Why no images allowed? (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sat, 14 Aug 2010 17:54:06 -0500
<<<I find it interesting that the censor of the RTTY list would be the one to cause problems here.>>> Joe, he just asked a question. Asking a question shouldn't "cause problems..." unless you are the
/archives//html/Amps/2010-08/msg00201.html (7,808 bytes)

73. [Amps] Tube cooling (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Mon, 16 Aug 2010 15:27:58 -0500
The dissipation spec for a tube is what it is. cooling doesn't change it. Cooling matters for the pin seals. The mfr. spec. for 3-500 pins is a bit above 200 degrees C. (I can't recall the exact temp
/archives//html/Amps/2010-08/msg00267.html (9,064 bytes)

74. Re: [Amps] Tube cooling (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Mon, 16 Aug 2010 17:40:27 -0500
Right--I should have included the envelope Carl and I recall you mentioning in some other thread that the Eimac glass envelopes were thicker than the Chinese so I assume they would hold up better but
/archives//html/Amps/2010-08/msg00273.html (12,710 bytes)

75. Re: [Amps] Can I cool too much the tubes? (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Wed, 18 Aug 2010 12:22:23 -0500
<<< According to Eimac, a pair of 3-500Zs at 1500 watts output need only about 26 CFM. At 1500 watts output an 8877 needs only about 20 CFM.>>> For how long at 1500 w.? rob K5UJ _____________________
/archives//html/Amps/2010-08/msg00297.html (8,254 bytes)

76. Re: [Amps] Can I cool too much the tubes? (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Thu, 19 Aug 2010 15:28:07 -0500
Rudy, Is this automatic standby mode protection a new thing with the Centurion? Mine is around 10 years old and it has nothing like this. When did you get yours? N.B. When you guys write about transm
/archives//html/Amps/2010-08/msg00326.html (8,624 bytes)

77. Re: [Amps] Can I cool too much the tubes? (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Fri, 20 Aug 2010 10:09:14 -0500
Pat, I have the amp, manual with schematic. There is nothing in there about any sensor that throws the amp in standby if it gets too hot. That's why I asked. It must be an aftermarket mod in your amp
/archives//html/Amps/2010-08/msg00337.html (13,249 bytes)

78. [Amps] Tubes, made in the USA, in the olden days; Films? (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Mon, 30 Aug 2010 11:02:21 -0500
I don't have the spec. sheet right in front of me but I recall the 833 could put out a hell of a lot of power with no forced air cooling. 600 w. (but I forget what biasing) sticks in my mind but don'
/archives//html/Amps/2010-08/msg00461.html (8,010 bytes)

79. Re: [Amps] Tubes, made in the USA, in the olden days; Films? (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Mon, 30 Aug 2010 12:18:09 -0500
Oh, okay I didn't know all that. it would work for me on AM since I typically operate only on 40 75 and 160 and I could run with a blg slow blower. Except that I have so much hardware now for 4-1000A
/archives//html/Amps/2010-08/msg00466.html (9,980 bytes)

80. Re: [Amps] HV wires, back-to-back diodes, and B- wiring (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sat, 11 Sep 2010 21:12:16 -0500
Not to be flip about this but if we're talking about the safest design, that is in my opinion, to forget about B+ cables and separate cabinets and build the whole thing, p.s. and RF deck, into a sing
/archives//html/Amps/2010-09/msg00099.html (8,433 bytes)

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