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Total 37 documents matching your query.

1. [Amps] Runaway Plate Current (score: 1)
Author: Roger <ai7rogerroger@gmail.com>
Date: Fri, 27 Dec 2013 22:16:18 -0800
Trying to finish up my 6m Junk Box Amp. Quad 4x150a's, 1700v anode, ~355vdc screen, ~ -55v bias. Input terminated in 50ohms, output terminated in 50ohms. Keying the amp with no excitation to adjust i
/archives//html/Amps/2013-12/msg00158.html (6,734 bytes)

2. Re: [Amps] Runaway Plate Current (score: 1)
Author: Roger <ai7rogerroger@gmail.com>
Date: Sat, 28 Dec 2013 19:25:26 -0800
Thanks to all who replied and my apologies for double posting. It took a while for this to get posted to the Amps Reflector so I also asked the question on the eHam forum. The problem was resolved by
/archives//html/Amps/2013-12/msg00184.html (8,072 bytes)

3. [Amps] Transformer needed (score: 1)
Author: Roger <ai7rogerroger@gmail.com>
Date: Mon, 27 Oct 2014 18:00:20 -0700
I'm looking for a plate transformer for my homebrew junkbox 2m/6m amp power supply designed around a pair of 4cx250b's in one and quad 4x150a's in the other. Specs need to be 2+kva, 120, 240 or both
/archives//html/Amps/2014-10/msg00228.html (6,539 bytes)

4. Re: [Amps] Transformer Needed (score: 1)
Author: Roger <ai7rogerroger@gmail.com>
Date: Wed, 29 Oct 2014 13:14:53 -0700
I'd like to thank everyone that took the time to respond. There are some very knowledgeable and very generous folks on this reflector. In the final outcome, I will rewind my failed transformer which
/archives//html/Amps/2014-10/msg00237.html (7,622 bytes)

5. Re: [Amps] Multi-tube vs Single or Dual-tube amps? (score: 1)
Author: Roger <ai7rogerroger@gmail.com>
Date: Mon, 19 Jan 2015 13:36:34 -0800
It becomes a lot more complex when you start adding tubes. Power supplies, in particular HV and Filament require high current capability, tank circuits become more complex because of the change in lo
/archives//html/Amps/2015-01/msg00148.html (8,852 bytes)

6. Re: [Amps] Tetrode software (score: 1)
Author: ai7rogerroger@gmail.com
Date: Thu, 30 Apr 2015 10:31:45 -0700
I copied all the extracted files into the main director "tetrode" before running the setup. Still can't generate charts on Win XP or 7. Roger AI7RR Sent from my iPhone _______________________________
/archives//html/Amps/2015-04/msg00182.html (7,613 bytes)

7. [Amps] Time to ask for help. (score: 1)
Author: Roger <ai7rogerroger@gmail.com>
Date: Sat, 25 Jul 2015 13:20:24 -0700
I've been building a 6m amp from scratch based on quad 4x150a's for more than 3 years. I've never built any type of rf producing device before and unbeknownst to me at the time, chose a project that
/archives//html/Amps/2015-07/msg00132.html (8,327 bytes)

8. [Amps] Follow-up...re: Time to ask for help. (score: 1)
Author: Roger <ai7rogerroger@gmail.com>
Date: Sun, 26 Jul 2015 09:48:37 -0700
Firstly, thanks all for the very positive responses I've received so far. I redid the neutralizing circuit and instead of a hard wired feed off the anode through a blocking cap to the neutralizing ca
/archives//html/Amps/2015-07/msg00141.html (7,492 bytes)

9. Re: [Amps] Follow-up...re: Time to ask for help. (score: 1)
Author: Roger <ai7rogerroger@gmail.com>
Date: Sun, 26 Jul 2015 17:50:38 -0700
Sorry, I thought it was clear what I was trying to do. I have four 4x150a tetrodes in parallel, attempting to make them operate on 50mhz. I'm confident my DC is stable. Additional information include
/archives//html/Amps/2015-07/msg00150.html (9,312 bytes)

10. Re: [Amps] Follow-up...re: Time to ask for help. (score: 1)
Author: Roger <ai7rogerroger@gmail.com>
Date: Sun, 26 Jul 2015 18:02:42 -0700
"I'm confident my DC is stable." Scratch that. I misunderstood the statement: "He has to make the amp DC stable before hooking up the input and output RF networks." 73, Roger AI7RR __________________
/archives//html/Amps/2015-07/msg00151.html (10,121 bytes)

11. Re: [Amps] Follow-up...re: Time to ask for help. (score: 1)
Author: Roger <ai7rogerroger@gmail.com>
Date: Mon, 27 Jul 2015 07:29:08 -0700
Schematic posted here: http://ai7rr.webs.com/apps/photos/photo?photoid=199229397 73, Roger AI7RR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.con
/archives//html/Amps/2015-07/msg00156.html (9,745 bytes)

12. Re: [Amps] Follow-up...re: Time to ask for help. (score: 1)
Author: Roger <ai7rogerroger@gmail.com>
Date: Mon, 27 Jul 2015 11:17:37 -0700
Sockets in use are Eimac SK-640. 73, Roger AI7RR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2015-07/msg00160.html (14,556 bytes)

13. Re: [Amps] Follow-up...re: Time to ask for help. (score: 1)
Author: Roger <ai7rogerroger@gmail.com>
Date: Mon, 27 Jul 2015 21:15:34 -0700
"I suggested to the original poster that he make it a swamped class AB1 amplifier. He will get plenty of drive with a 50-ohm swamping resistor. The only tuning he needs is a small coil to balance out
/archives//html/Amps/2015-07/msg00170.html (11,932 bytes)

14. [Amps] Finale: Time to ask for help. (score: 1)
Author: Roger <ai7rogerroger@gmail.com>
Date: Tue, 18 Aug 2015 19:34:08 -0700
In case you don't recall, I am building a 6m amp and power supply from the ground up based on quad 4x150a tubes in parallel. My problem was definitely instability and I wish I could provide a definit
/archives//html/Amps/2015-08/msg00064.html (7,239 bytes)

15. [Amps] Link to the Ugly Amp (score: 1)
Author: Roger <ai7rogerroger@gmail.com>
Date: Sat, 28 Nov 2015 14:42:54 -0800
http://ai7rr.webs.com/apps/photos/photo?photoid=200392040 73, Roger AI7RR CN83 _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailma
/archives//html/Amps/2015-11/msg00157.html (6,808 bytes)

16. Re: [Amps] Ugly Amps (score: 1)
Author: Roger <ai7rogerroger@gmail.com>
Date: Wed, 2 Dec 2015 17:05:58 -0800
The cooling is pretty efficient. I have a blower stuffed into a filtered enclosure for noise abatement and am using a very flexible RV sewage discharge hose and the quick connect couplings so I can e
/archives//html/Amps/2015-12/msg00013.html (8,423 bytes)

17. [Amps] Ugly Amp Power Supply (score: 1)
Author: Roger <ai7rogerroger@gmail.com>
Date: Sat, 5 Dec 2015 12:58:57 -0800
Couple of photos of the inside of the power supply of my Ugly Amp located here: http://ai7rr.webs.com/apps/photos/album?albumid=15891953 73, Roger AI7RR CN83 _________________________________________
/archives//html/Amps/2015-12/msg00027.html (6,480 bytes)

18. Re: [Amps] Capacitor and Alpha 374 question (score: 1)
Author: Roger <ai7rogerroger@gmail.com>
Date: Sun, 21 Aug 2016 07:25:21 -0700
I find it strange that the op specified the suspect capacitor as "40pf" / 5kv. Either this is a slip of the fingers on the keyboard , most likely, or something is sorely out of place. 73, Roger W7TZ
/archives//html/Amps/2016-08/msg00057.html (10,190 bytes)

19. Re: [Amps] Buzzing transformer (score: 1)
Author: Roger <ai7rogerroger@gmail.com>
Date: Thu, 29 Sep 2016 14:48:27 -0700
Provided the windings are good, I'm wondering if it wouldn't be possible to rebake the transformer or even apply an additional coating of sealant and rebake to see if it would reseal the pieces parts
/archives//html/Amps/2016-10/msg00001.html (8,381 bytes)

20. Re: [Amps] Labeling house circuits (score: 1)
Author: Roger <ai7rogerroger@gmail.com>
Date: Tue, 21 Mar 2017 10:46:41 -0700
If only a couple of outlets, remove the faceplate and paint it for quick identification, then use coordinated colored tape at the breaker in the panel. 73, Roger W7TZ CN83ia _________________________
/archives//html/Amps/2017-03/msg00135.html (9,239 bytes)

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