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Total 61 documents matching your query.

1. [Amps] Motorola RF transistor question (score: 1)
Author: "Randall, Randy" <Randy.Randall@uchealth.com>
Date: Wed, 22 Sep 2010 21:48:50 -0400
I have a pair of Motorola house # M9848 transistors and I need to know the specs on the units. Are they similar to a MRF-454? Thank you, Randy. Randy AB9GO ________________________________ Confidenti
/archives//html/Amps/2010-09/msg00284.html (6,983 bytes)

2. Re: [Amps] Motorola RF transistor question (score: 1)
Author: "Randall, Randy" <Randy.Randall@uchealth.com>
Date: Mon, 27 Sep 2010 15:01:35 -0400
The transistors are from a 2-30 Mhz SSB radio by Motorola. No idea of the model # though. Randy AB9GO Hi Randy, Probably not. The M9xxx parts are typically found in VHF & UHF radios; the '454 is an H
/archives//html/Amps/2010-09/msg00360.html (9,980 bytes)

3. [Amps] Schematic sought for Apollo 300X (score: 1)
Author: "Randall, Randy" <Randy.Randall@uchealth.com>
Date: Tue, 5 Oct 2010 10:39:25 -0400
I am looking to rehab an old Apollo 300X base amplifier to use with a MFJ-9406 on 6 meters. It uses a single 6LQ6 in GG and has an output tank circuit for 15, 10 or 6 meters. I need a schematic for i
/archives//html/Amps/2010-10/msg00030.html (8,690 bytes)

4. Re: [Amps] Switching Supplies for High Current Filaments (score: 1)
Author: "Randall, Randy" <Randy.Randall@uchealth.com>
Date: Wed, 6 Oct 2010 08:56:28 -0400
Surplus switchers are available quite reasonably priced versus the much scarcer transformers of the same ratings. Randy AB9GO Why not use a regular filament transformer? Baruch Zilbershatz Nitzanay-O
/archives//html/Amps/2010-10/msg00047.html (9,174 bytes)

5. Re: [Amps] Matched Pairs of Tubes (score: 1)
Author: "Randall, Randy" <Randy.Randall@uchealth.com>
Date: Fri, 19 Nov 2010 10:07:25 -0500
AudioPhool. Take a look at this: http://cgi.ebay.com/FAIRCHILD-AMPLIFIER-MODEL-620-2A3-300B-PP-EXCELLENT-/250722093940?pt=Vintage_Electronics_R2&hash=item3a60338b74 $57,000 for a pair of 10 watt (on
/archives//html/Amps/2010-11/msg00353.html (9,611 bytes)

6. Re: [Amps] Derating Dry Loads (score: 1)
Author: "Randall, Randy" <Randy.Randall@uchealth.com>
Date: Tue, 7 Dec 2010 10:25:04 -0500
I have used a 15 watt dry load @ 100 watts for 5 seconds without incident. It is the model that Radio Shack sold approx. 10 years ago. It was also sold under the Welz (sp) brand. In the specs it was
/archives//html/Amps/2010-12/msg00049.html (8,891 bytes)

7. Re: [Amps] Derating Dry Loads (score: 1)
Author: "Randall, Randy" <Randy.Randall@uchealth.com>
Date: Tue, 7 Dec 2010 16:18:45 -0500
Possibly the best advice of all would be to call Bird. They would know. ;') Randy Randy E. Randall AB9GO Network Engineer UC Health Randy.Randall@UCHealth.com Phone 513-585-7146 Fax 513-585-7159 Near
/archives//html/Amps/2010-12/msg00057.html (10,061 bytes)

8. Re: [Amps] Derating Dry Loads (score: 1)
Author: "Randall, Randy" <Randy.Randall@uchealth.com>
Date: Wed, 8 Dec 2010 09:24:17 -0500
I remember Ford having a torque spec on their aluminum head engines in the 80's that read " Tighten the head bolt to XX ft lbs, then turn the bolt an additional 1/4 turn." Randy Randy E. Randall AB9G
/archives//html/Amps/2010-12/msg00065.html (10,788 bytes)

9. [Amps] Measuring amp B+ (score: 1)
Author: "Randall, Randy" <Randy.Randall@uchealth.com>
Date: Wed, 26 Jan 2011 16:25:58 -0500
Hello all, I have on the way a Fluke 80K-6 HV probe. It is only rated to CAT I and from the text below it may not be suitable for measuring the B voltage of a linear amp esp. one with a large filter
/archives//html/Amps/2011-01/msg00328.html (8,823 bytes)

10. Re: [Amps] MACHLETT tubes? (score: 1)
Author: "Randall, Randy" <Randy.Randall@uchealth.com>
Date: Thu, 10 Feb 2011 14:45:07 -0500
I have seen the name a few years ago on X-ray tubes here @ work. Randy E. Randall AB9GO Network Engineer UC Health Randy.Randall@UCHealth.com Phone 513-585-7146 Fax 513-585-7159 It is an old name tha
/archives//html/Amps/2011-02/msg00088.html (10,497 bytes)

11. Re: [Amps] Where is power measured ? (score: 1)
Author: "Randall, Randy" <Randy.Randall@uchealth.com>
Date: Wed, 6 Apr 2011 12:50:33 -0400
That would be the mighty 519 out of Cincinnati sponsored by Fairfield Amateur Radio Association FARA. It was a mighty repeater (IN/OH/KY/MI/TN/IL) until squabbling, OTR truckers, QRM'ers, maintenance
/archives//html/Amps/2011-04/msg00242.html (10,816 bytes)

12. Re: [Amps] Blown anode choke TL922 (score: 1)
Author: "Randall, Randy" <Randy.Randall@uchealth.com>
Date: Mon, 25 Apr 2011 11:17:48 -0400
Alpha is copying Ameritron?! Sad.... Randy E. Randall AB9GO Network Engineer UC Health Randy.Randall@UCHealth.com Phone 513-585-7146 Fax 513-585-7159 --Original Message-- From: amps-bounces@contestin
/archives//html/Amps/2011-04/msg00522.html (18,997 bytes)

13. Re: [Amps] 3-1000 Amplifiers (score: 1)
Author: "Randall, Randy" <Randy.Randall@uchealth.com>
Date: Wed, 11 May 2011 09:59:37 -0400
I would wonder about the 3-1000 glass to metal seals. Since the 3-1000 constructed similarly to the 3-500z, would not it have the same issues with the pin seals leaking over time? I have seen warning
/archives//html/Amps/2011-05/msg00049.html (10,691 bytes)

14. Re: [Amps] Using switch mode power supply for heater power (score: 1)
Author: "Randall, Randy" <Randy.Randall@uchealth.com>
Date: Tue, 28 Jun 2011 10:34:17 -0400
Look here: http://www.ametherm.com/inrush-current/megasurge-inrush-current-limiters.html They supply units up to 50A and have free samples available, but @ $6.20 qty 1 for the 50A part at Digikey why
/archives//html/Amps/2011-06/msg00302.html (10,970 bytes)

15. Re: [Amps] New NXP BLF578XR 1200W LDMOS FET is "indestructible" (score: 1)
Author: "Randall, Randy" <Randy.Randall@uchealth.com>
Date: Fri, 22 Jul 2011 11:36:08 -0400
Since most power RF transistors will blow if you even look at them incorrectly, and a tough device adds a lot of value and eliminates some of the required protection devices I'd venture that the pric
/archives//html/Amps/2011-07/msg00256.html (13,639 bytes)

16. Re: [Amps] To rewind or not? (3KA resonant filter choke) (score: 1)
Author: "Randall, Randy" <Randy.Randall@uchealth.com>
Date: Tue, 10 Jan 2012 15:54:19 -0500
Simpson will not support any of the old 260's with the 5K range. They will not even talk to you. You can bet someone got blown to hell in an industrial environment using a 260 during an arc flash eve
/archives//html/Amps/2012-01/msg00120.html (12,411 bytes)

17. Re: [Amps] Buying Stolen Tubes? (score: 1)
Author: "Randall, Randy" <Randy.Randall@uchealth.com>
Date: Wed, 14 Mar 2012 09:26:17 -0400
I would think there is less stolen merchandise on Ebay than on Craig's List or your local tail gate flea market. EBay is too easy to track back to the seller. Randy. Randy E. Randall AB9GO Network En
/archives//html/Amps/2012-03/msg00171.html (9,531 bytes)

18. Re: [Amps] HT-41 (score: 1)
Author: "Randall, Randy" <Randy.Randall@uchealth.com>
Date: Tue, 20 Mar 2012 10:27:32 -0400
Since you have SS diodes in there, use the variac and an inline amp meter. Increase the line voltage from 10 volts to nominal operating voltage. Do this in 10 volt steps 10 - 15 min between steps. Ra
/archives//html/Amps/2012-03/msg00211.html (8,281 bytes)

19. Re: [Amps] Corian for HV insulators? (score: 1)
Author: "Randall, Randy" <Randy.Randall@uchealth.com>
Date: Thu, 22 Mar 2012 09:21:43 -0400
My question is: What is your source for scrap Corian? I can't find a source. I have approached installers and they never have any. "It's too expensive to have scrap. We measure 5 times and then one m
/archives//html/Amps/2012-03/msg00225.html (8,650 bytes)

20. Re: [Amps] Corian for HV insulators? (score: 1)
Author: "Randall, Randy" <Randy.Randall@uchealth.com>
Date: Thu, 22 Mar 2012 10:35:37 -0400
I was thinking of using some of this material outside. How well does it hold up to UV and cold temps?? If round stock could be sourced I could manufacture beehive insulators for high power end fed an
/archives//html/Amps/2012-03/msg00228.html (8,455 bytes)

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