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Total 421 documents matching your query.

1. [Amps] Mail Order Operations (score: 1)
Author: "Harold B. Mandel" <>
Date: Mon, 1 Sep 2003 11:05:45 -0400
Dear Friends, Personal experience has taught me to shy away from remote deals. A supposed reliable seller on the popular auction site had pictures, an accurate description, a written return policy, a
/archives//html/Amps/2003-09/msg00007.html (7,406 bytes)

2. [Amps] (score: 1)
Author: "Harold B. Mandel" <>
Date: Wed, 3 Sep 2003 11:44:29 -0400
Hi, Brian, It is with great pleasure that the report to you is that after forty one (41) years of hamming I have never encountered an Amateur swindler. Now we won't mention a certain Research Fellow
/archives//html/Amps/2003-09/msg00026.html (7,700 bytes)

Author: Harold B Mandel <>
Date: Thu, 4 Sep 2003 21:34:12 -0400
Dear Paul, Molybdenum Disulphide grease. Comes in small tubes. Industrial distributors or Internet sales. (Magic knowledge from IBM Corp. days.) Best '73, Hal Mandel KA1XO/4 _________________________
/archives//html/Amps/2003-09/msg00046.html (6,623 bytes)

4. [Amps] Molybdenum Disulphide Grease (score: 1)
Author: Harold B Mandel <>
Date: Fri, 5 Sep 2003 23:01:10 -0400
Moly-Kote (tm) is one manufacturer's brand name. The true molybdenum disulphide grease is very thick and difficult to squeeze out of the tube. It is an excellent RF conductor and is used in the broad
/archives//html/Amps/2003-09/msg00057.html (7,052 bytes)

5. Re: [Amps] Roller Inductor Lubrication (score: 1)
Author: "Harold B. Mandel" <>
Date: Sun, 7 Sep 2003 11:48:36 -0400
Dear Doctor Bill, Years ago I home-brewed an antenna tuner using a 28 microhenry roller inductor that was manufactured by B&K and was a real piece of art: ceramic work was clean, the roller bar was s
/archives//html/Amps/2003-09/msg00067.html (7,970 bytes)

6. [Amps] X-TRA TUBE DAYS (score: 1)
Author: Harold B Mandel <>
Date: Wed, 10 Sep 2003 03:36:05 -0400
Tubes????? What are tubes? Part of the fun of homebrewing linear (and not so linear) power amplifiers is the sense of accomplishment when the beast fires up and actually does something. The DX-60 tra
/archives//html/Amps/2003-09/msg00091.html (7,791 bytes)

7. [Amps] Parallel Diodes (score: 1)
Author: Harold B Mandel <>
Date: Fri, 12 Sep 2003 17:58:40 -0400
Power supply circuits of the '80's included a 470K, 5-watt, 1-percent, metal film resistor AND a 0.01uf mica capacitor paralleling each diode device. pitfalls surrounding transient pulse accumulated
/archives//html/Amps/2003-09/msg00108.html (7,326 bytes)

8. [Amps] Bonding Teflon (score: 1)
Author: Harold B Mandel <>
Date: Tue, 16 Sep 2003 18:22:23 -0400
Sirs, Cyanoacrylate compounds such as the gel form of industrial adhesive will bond PTFE. The secret to the work is to break up the surface with a light burnishment. Anything to change the surface RM
/archives//html/Amps/2003-09/msg00152.html (6,637 bytes)

9. Re: [Amps] Al-811 Troubleshooting (score: 1)
Author: "Harold B. Mandel" <>
Date: Sun, 21 Sep 2003 02:20:38 -0400
Dear Chris, The tube that's smokey is indicative of a vacuum leak. The silvery deposit inside tubes is called "getter." This deposit attracts stray oxygen molecules inside the vacuum tube. It "gets"
/archives//html/Amps/2003-09/msg00178.html (7,705 bytes)

10. [Amps] SB-220 Knobs (score: 1)
Date: Mon, 27 Oct 2003 08:24:46 GMT
Running into the same hazard I went ahead and ordered one of those crank-type knobs used on Millen turns counter escutcheons that oftentimes spin inductor coils or vacuum capacitors. That way I knew
/archives//html/Amps/2003-10/msg00246.html (6,452 bytes)

11. [Amps] HEAT EXCHANGER (score: 1)
Date: Tue, 4 Nov 2003 09:36:58 GMT
A very economical heat exchange unit is a motorcycle oil cooler. These are available at motorcycle used and swap meets, or you can go on the 'net and find some place like for their stock
/archives//html/Amps/2003-11/msg00037.html (6,494 bytes)

12. Re: [Amps] SB220 (score: 1)
Date: Tue, 4 Nov 2003 09:46:32 GMT
Dear Morris, The SB-220 should be modified so that it limits the inrush current to the filaments. I used a switch and resistor in the filamanet XFMR primary that put the resistor in series and then b
/archives//html/Amps/2003-11/msg00038.html (7,381 bytes)

13. [Amps] SB-220 (score: 1)
Date: Thu, 6 Nov 2003 01:08:00 GMT
We're really hashing this one to death! Needless to say, over 35 years of HR I still remember using the '220 with a tube-operated HB 80-10 xcvr, and I worked CW (sans QSK, of course), and SSB with no
/archives//html/Amps/2003-11/msg00066.html (7,474 bytes)

14. [Amps] Getting Back In (score: 1)
Author: "Harold B. Mandel" <>
Date: Sun, 9 Nov 2003 13:04:59 -0500
Hi Friends, Reading all the mail here has bitten me once again. I'm assembling a station that I'll carry from hotel to hotel. Another gentleman on this 'net gave me a lead to an Alpha 77, but it was
/archives//html/Amps/2003-11/msg00121.html (6,697 bytes)

15. [Amps] Thanks for the Wake UP! (score: 1)
Author: "Harold B. Mandel" <>
Date: Mon, 10 Nov 2003 09:56:34 -0500
Dear Jeff and all those who so kindly thought of replying so candidly, T H A N K Y O U. I've been in this particular hotel room since June, and even though I've dragged a complete AutoCad 2-monitor w
/archives//html/Amps/2003-11/msg00132.html (7,698 bytes)

16. Re: [BULK] - Re: [Amps] Getting Back In (score: 1)
Date: Tue, 11 Nov 2003 23:51:04 GMT
Putting the ALPHA on its side on the luggage cart gets it into the elevator with no problem. Lifting it out of the trunk of the car without dropping it in the parking lot is a challenge for one. I ju
/archives//html/Amps/2003-11/msg00144.html (7,565 bytes)

17. [Amps] Yaesu FT-1000/o'scope, bandscope data request (score: 1)
Date: Sat, 15 Nov 2003 08:34:55 GMT
Gentlemen, Knowing this topic is a bit off from our usual go-around with power amplifiers I ask your indulgence and possibly a direction to take to seek knowledge in a better way. The new radio came,
/archives//html/Amps/2003-11/msg00188.html (7,380 bytes)

18. Re: [Amps] Benefits of 3-phase power? (score: 1)
Date: Sun, 16 Nov 2003 07:22:17 GMT
Dear Gene, Having been fortunate to have 3-phase power available in the lab where we Type-Accepted DC Powerplants for cellular transmit sites I took advantage of the situation and hooked up a strip c
/archives//html/Amps/2003-11/msg00207.html (7,699 bytes)

19. Re: [Amps] trouble with TT centurion (score: 1)
Date: Tue, 25 Nov 2003 03:22:10 GMT
Hi John, Crank up your full kit with a good dummy load. First, crank up the exciter with the NYE going to the Load resistor, full tilt, and check for RFI/TVI. Borrow a rcvr and check your audio after
/archives//html/Amps/2003-11/msg00351.html (8,297 bytes)

20. Re: [Amps] 220V service for amplifier (score: 1)
Date: Wed, 3 Dec 2003 07:24:33 GMT
Dear Jason, On your amplifier there will more than likely be an attachment to the metal box where a grounding conductor can terminate. The metal frame of your amplifier should have an independent gro
/archives//html/Amps/2003-12/msg00030.html (8,672 bytes)

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