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1. [Amps] FW:  negative screen current (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Mon, 30 Dec 2013 21:39:42 -0600
I don?t know that this info would have any bearing on the discussion but for what it's worth... Several years ago after moving across country, I experienced a problem when I tried to use my AL-1500 w
/archives//html/Amps/2013-12/msg00218.html (11,778 bytes)

2. [Amps] FW: Air temps leaving the amp. (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Mon, 3 Feb 2014 21:56:26 -0600
Air temp rise = (total watts dissipated x 3.41) / (1.08 x cfm) Total watts dissipated = heater watts + (1-efficiency) x (input power + exciter power) 8873 heater spec is 10A @ 5.0 = 50w Assuming your
/archives//html/Amps/2014-02/msg00038.html (10,674 bytes)

3. [Amps] FW: Air temps leaving the amp. (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Mon, 3 Feb 2014 22:02:52 -0600
Induction motor speed = 60 hz x 60 sec/min / number of poles on the motor. If it is multi speed motor (multiple windings or taps) then one can select a speed by rewiring. If you need an airflow reduc
/archives//html/Amps/2014-02/msg00039.html (10,554 bytes)

4. [Amps] FW: FW: Air temps leaving the amp. (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Tue, 4 Feb 2014 22:55:43 -0600
Thanks Carl, Yes - 8877 (not 8873) and yes I was using slang (heater) when referring to the filament. There was another post I read regarding actual seal temperature using color sticks, which is real
/archives//html/Amps/2014-02/msg00043.html (15,155 bytes)

5. [Amps] FW: FW: FW: Air temps leaving the amp (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Fri, 7 Feb 2014 00:48:41 -0600
Thanks Steve, Is that because a "heater" heats an independent cathode, whereas a "filament" acts as both the heating element and the cathode simultaneously? I'm not sure I know the definitions correc
/archives//html/Amps/2014-02/msg00052.html (7,785 bytes)

6. [Amps] FW: Filament Voltage Question (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Sat, 26 Apr 2014 02:15:23 -0500
I am perhaps confused. In my experience, grain growth generally produces increased ductility and improved (or restored depending on your point of view) yield strength more-or-less according to the Ha
/archives//html/Amps/2014-04/msg00224.html (11,770 bytes)

7. [Amps] FW: Filament Growth Question (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Sun, 27 Apr 2014 02:31:14 -0500
Thanks John. I can share what I learned from another ham who emailed me direct and described that the thorium migrates slowly to the surface of the tungsten element over time, causing the change in m
/archives//html/Amps/2014-04/msg00228.html (10,162 bytes)

8. [TowerTalk] Relay Recommendations (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Fri, 9 May 2014 16:41:13 -0500
I would appreciate recommendations for general purpose SPDT relays that can be used reliably for RF antenna switching duty - it is not a hot switching application. I am aware that the DC & 60hz AC ra
/archives//html/Amps/2014-05/msg00045.html (6,682 bytes)

9. [Amps] FW: Relay Recommendations (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Fri, 9 May 2014 20:56:19 -0500
Hi Jim, Application is for three sets of stack match boxes Coil: 12 VDC (preferred) Power: legal limit Point-to-point soldered connections (for strap or RG142) Screw (or adhesive) mounting Thanks aga
/archives//html/Amps/2014-05/msg00056.html (9,172 bytes)

10. [Amps] Relay Recommendations (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Sat, 10 May 2014 21:09:07 -0500
Just wanted to says thanks to all who responded with information, recommendations, and advice on relays. Much appreciated! Matt KM5VI _______________________________________________ Amps mailing list
/archives//html/Amps/2014-05/msg00065.html (6,602 bytes)

11. [Amps] FW: 4Z4RB amplifiers (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Wed, 2 Jul 2014 12:32:03 -0500
Forgive my ignorance, but just comparing the input volts/amps to the output would seem to indicate an efficiency of ~75%, which would indicate class C operation. How could these be suitable for anyth
/archives//html/Amps/2014-07/msg00008.html (7,368 bytes)

12. [Amps] FW: [tdxs-list] FW: Whither SPE Expert ?? (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Tue, 22 Jul 2014 01:52:40 -0500
Hi Charly, Please see response from our local reflector. Also, another ham suggested that you might try the phone number listed on the website. Matt KM5VI From: Chuck Dietz [mailto:w5prchuck@gmail.co
/archives//html/Amps/2014-07/msg00093.html (8,723 bytes)

13. [Amps] Circuit Board Question (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Fri, 1 Aug 2014 01:19:35 -0500
Could someone help me out with some advice. How much separation between circuit board traces in an antenna switch box would be recommended to reliably handle the voltage associated with legal limit a
/archives//html/Amps/2014-08/msg00000.html (6,224 bytes)

14. [Amps] FW: Ameritron AL1500 help (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Mon, 15 Dec 2014 23:07:53 -0600
Hi Ed, I had the exact same problem a few years ago with my AL-1500. Check that the machine screws that support the HV diode board through the bottom of the amp case are good and tight. The diode boa
/archives//html/Amps/2014-12/msg00062.html (8,767 bytes)

15. [Amps] FW: I'm not kidding: TL922 (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Wed, 4 Feb 2015 00:38:43 -0600
Hi Colin, First intuition is audio noise that is just higher than human hearing range but still within the dogs hearing range. Key down, such as tuneup and CW as you describe works the power supply t
/archives//html/Amps/2015-02/msg00040.html (9,134 bytes)

16. [Amps] FW: Status of Alpha (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Tue, 3 Oct 2017 01:06:06 -0500
My Google search for "Alpha Amplifiers" consistently returns https://alpharfsystems.com as the #1 choice, however, Google won't let me access that site because of "Error Certificate Revoked". Just do
/archives//html/Amps/2017-10/msg00008.html (8,865 bytes)

17. [Amps] FW: Status of Alpha (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Tue, 3 Oct 2017 23:33:57 -0500
Mike, Just wanted to let you and others know that the Alpha https secure link is working correctly now via Google - so Google users should be able to quickly find you on the WEB, and more importantly
/archives//html/Amps/2017-10/msg00041.html (7,874 bytes)

18. [Amps] FW: Ceramic valve exhaust air temperature (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Fri, 27 Oct 2017 01:24:31 -0500
Hi Alan, Considering airflow at std. room conditions, temperature rise can be approximated as follows: Temp Rise = watts x 3.16 / cfm For the derivation... Q = Cp x mass flow rate x delta T Mass flow
/archives//html/Amps/2017-10/msg00171.html (10,857 bytes)

19. [Amps] Revival advice (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Fri, 30 Mar 2018 22:14:59 -0500
I am in need of some amp revival advice. I have a 1st generation Gonset GSB201 that I want to restart. I have not put power to it since 2008 when I replaced the power supply caps. It worked fine at t
/archives//html/Amps/2018-03/msg00076.html (7,462 bytes)

20. [Amps] FW: Revival advice (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Sat, 31 Mar 2018 14:27:36 -0500
Hi Jim, Thank you and also K7FM for the advice. Correct about no tuned input, the desire to put the old girl back in service is to complement an FT102 that just got restored by N4CL. Theres no ALC on
/archives//html/Amps/2018-04/msg00000.html (11,890 bytes)


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