5301.JPG 964 KB |
5302.JPG 885 KB |
5303.JPG 979 KB |
Well, here's the mess- er I mean, uh "rig". Haven't had any time to do anything else to it. The fixed bias supply will be moved from the Kenwood internal to a external divider to hopefully cure the intermittant grid- drive problem. Also, when I can locate it in my junk, I will insert a 25 ohm 25W pot in series w/the resistor across the xfmr input for more audio drive control. I want more output from the 12BY7A so I will work to increase the efficiency of that stage, maybe put an untuned amp stage ahead of it. When I'm sure it's stable I will install the W7CPA 6146W's and neutralize. Working on locating a Heathkit HP-13A to up the B+ to 750V. Then build the modulator and meters into a box. |
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5305.JPG 724 KB | 5307.JPG 962 KB |
AM Filter generously donated by Bill, K7VZP, works great -- rig has a whole new personality. Fidelity is superb. |
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5309.JPG 1130 KB |
5310.JPG 990 KB |
5311.JPG 1100 KB |
Power supply components removed and cabling added for HP-10 and new metering and switching box. Also a view of the bottom of the PA board showing replacement of the 4 20 ohm cathode resistors w/two 10 ohm 1W. Plate and screen bypass caps have been replaced with .001uf to prevent modulation audio from being shunted to gnd. |
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5312.JPG 810 KB |
5313.JPG 960 KB |
5314.JPG 1040 KB |
Front & rear views of rig, inside view of meter box shows mod xfmr., screen resistors & switches (PA B+ & Tune/Op to reduce screen voltage for tune-up). |
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5315.JPG 1110 KB |
5316.JPG 700 KB |
5317.JPG 830 KB |
Station lt. to rt. -- TS-530S, Behringer 1202 FX mixer, Kenwood KAC-714 100W audio amp (under spkr), top volt and ammeters monitor batteries, bottom Heathkit 2140 A wattmeter, IC-2000 2m rig, IC-720A HF rig. Mike is Shure SM-58. |
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5319.JPG 790 KB |
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