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1. [Amps] SB-220 Transformer Problem (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Fri, 5 Apr 2002 12:47:11 -0000; Moral: When powering up any unknown or suspect piece of mains powered equipment, from hairdryers through to mission control, get youself a standard mains cord and in series with the hot or phase lead; /archives//html/Amps/2002-04/msg00172.html (11,362 bytes)
2. [Amps] SB-220 Transformer Problem (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Fri, 5 Apr 2002 18:27:19 -0000; True. Was not aware the transformer was potted, Was also not aware the Heath is not fused. Would suggest fittng miniature circuit breaker if this is the case. 73 end Barry Kirkwood PhD ZL1DD Signal H; /archives//html/Amps/2002-04/msg00182.html (8,733 bytes)
3. [Amps] tuning tetrode amplifiers correctly (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Tue, 9 Apr 2002 02:49:18 -0000; I beg to differ on the matter of neutralisation. There are different ways this can be achieved, but true neutralisation can be redrawn as a bridge circuit which is frequency independent. Classic text; /archives//html/Amps/2002-04/msg00255.html (8,826 bytes)
4. [Amps] Emtron Amps - Anyone on here using their HF products? (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Wed, 13 Mar 2002 02:29:55 -0000; Jukka OH2BH used one at VR6BH after Brand X died. He spoke very highly of it. Believe Marty ZL1ANJ is still using it. 73 73 end Barry Kirkwood PhD ZL1DD Signal Hill Homestay 66 Cory Road Palm Beach W; /archives//html/Amps/2002-03/msg00271.html (9,173 bytes)
5. [Amps] Antenna vs. amp (was: al-1200 question) (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Thu, 14 Mar 2002 16:54:01 -0000; True, but the converse is not true, You can have directivity independent of gain as witness loop and other directional receiving antennas. Or yagis with lossy elements... 73 end Barry Kirkwood PhD ZL; /archives//html/Amps/2002-03/msg00315.html (11,097 bytes)
6. [Amps] Henry 2KD Classic (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Thu, 21 Mar 2002 18:40:45 -0000; All true. I had some that squeaked! Before I found out where the mouse was the electros died and took the rectifiers with them. 73 end Barry Kirkwood PhD ZL1DD Signal Hill Homestay 66 Cory Road Palm; /archives//html/Amps/2002-03/msg00475.html (8,772 bytes)
7. [Amps] Interesting Zero Bias Tube - the Amperex ZB120 (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Wed, 27 Mar 2002 04:57:36 -0000; Reminds me of a breathless editorial I read in the NZ ham journal "Break-In" for 1936 or there about. Predicted the imminent demise of cw due to a technological break through : AM with modulators usi; /archives//html/Amps/2002-03/msg00621.html (8,441 bytes)
8. [AMPS] Filamant CT (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Sun, 3 Feb 2002 20:10:50 -0000; If you consult your 1930 ARRL Handbook you would learn that one CTs a filament transformer with Xmas tree lights in series, hi! 73 end Barry Kirkwood PhD ZL1DD Signal Hill Homestay 66 Cory Road Palm; /archives//html/Amps/2002-02/msg00043.html (8,010 bytes)
9. [AMPS] Power out indicator (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Mon, 18 Feb 2002 17:02:21 -0000; I have managed to melt solder etc in maladjusted ATUs with 100W power levels.The advice about lamp or thermocouple meters in the feedline is good, only needs to be used when setting up. Once characte; /archives//html/Amps/2002-02/msg00190.html (10,980 bytes)
10. [AMPS] Antenna tuner (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Wed, 20 Feb 2002 14:29:48 -0000; I have not seen the original circuit, but the required capacitance seems very large to me. If on an input link only 1000pf max should be ample above 3MHz. ex BC variables should suffice up to 1 kW pl; /archives//html/Amps/2002-02/msg00208.html (8,379 bytes)
11. [AMPS] Parallel Network (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Wed, 20 Feb 2002 20:19:46 -0000; There is an excellent discussion on the parrallel tunde circuit (classic) ATU by the learned Dr Cebik (www.cebik.com) . The oldtimers used them almost unversally back in the days when open wire line; /archives//html/Amps/2002-02/msg00212.html (9,991 bytes)
12. [AMPS] HA-10 Conversion to 572B Tubes (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Fri, 22 Feb 2002 01:39:06 -0000; I can vouch for this: Ken's amp looks and works better than new. Looks great alongside his mint HRO 5T and Johnson Tx! 73 Barry end Barry Kirkwood PhD ZL1DD Signal Hill Homestay 66 Cory Road Palm Bea; /archives//html/Amps/2002-02/msg00222.html (9,309 bytes)
13. [AMPS] mof resistors (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Sat, 23 Feb 2002 08:35:56 -0000; I am open to correction on this (Eu members should be able to confirm) but I think the standard Phillips product resistors are metal film and very stable. 73 end Barry Kirkwood PhD ZL1DD Signal Hill; /archives//html/Amps/2002-02/msg00234.html (8,506 bytes)
14. [AMPS] Noise (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Sun, 27 Jan 2002 23:55:13 -0000; Hello Ampers All: My PT2000A 2 3-500A amp has done years of good service. It has a blower which now seems to be generating QRN : clicks about 3 per second that I can kill with the noise blanker on my; /archives//html/Amps/2002-01/msg00209.html (6,839 bytes)
15. [AMPS] Shunt regulated high voltage psu (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Tue, 29 Jan 2002 10:31:23 -0000; Which just perhaps leads us back to Ian's comments on the Collins 30S1, big screen supply with choke input filter in series with anode supply, bias supply also stiff but value floating with mains var; /archives//html/Amps/2002-01/msg00251.html (15,367 bytes)
16. [AMPS] Iron regulated screen supply? (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Wed, 30 Jan 2002 17:36:24 -0000; Contemplating building a tetrode linear from the accumulated treasures of years. Thinking back on the 30S-1 approach, and amateur as opposed to production budgeting. Thoughts: If one is starting from; /archives//html/Amps/2002-01/msg00314.html (8,114 bytes)
17. [AMPS] Iron regulated screen supply? (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Wed, 30 Jan 2002 20:32:03 -0000; Let us get the arithmetic right: Assuming we are talking, say, 3kV @ 1A peak power for the anode, then the screen load is trivial by comparison. If building from iron collected from surplus sources,; /archives//html/Amps/2002-01/msg00332.html (10,586 bytes)
18. [AMPS] Shunt regulated high voltage psu (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Wed, 30 Jan 2002 20:35:48 -0000; And presumably if one has screen overcurrent protection the screen supply will close down if there are no anode volts..... end Barry Kirkwood PhD ZL1DD Signal Hill Homestay 66 Cory Road Palm Beach Wa; /archives//html/Amps/2002-01/msg00333.html (10,820 bytes)
19. [AMPS] AL1500: Longer term survival of contemporary equipment (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Thu, 6 Dec 2001 16:59:14 -0000; Considerable wisdom being spoken here. It is quite clear that early generation ham equipment, if not home built was certainly home repairable (and modifiable ). Most of the better early generation so; /archives//html/Amps/2001-12/msg00148.html (14,401 bytes)
20. [AMPS] Where I get it??? (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Mon, 10 Dec 2001 23:32:06 -0000; 1. Diathermies. Major hospitals may have a used/obsolete equipment store where these might be found, cheap. 2. Defibrillators. May have nice capacitor stacks for HV power supplies. Good hunting! 73 e; /archives//html/Amps/2001-12/msg00202.html (9,102 bytes)

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