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Gonset G-50




 
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July 15, 2018, 05:03:25 PM *
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Author Topic: Gonset G-50  (Read 3281 times)
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WB4YVO
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« Reply #100 on: July 01, 2018, 09:17:21 PM »

Wonder why its different.. Mine seems to have more Grid current in Xtal mode  Maybe that's why..

Mine only loads to about 5 in plate position both Xtal and VFO..

Mine is rock solid no drift..

Skip
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KD1SH
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« Reply #101 on: July 01, 2018, 09:23:58 PM »

    I'm thinking the slow drift in power output must be heat related - the change takes place over a span of 30 seconds or so.  Something intermittent like cold solder or a cracked carbon-comp would be all herky-jerky spastic, while this is slow as molasses.
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PA0NVD
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Nico and Chappie (Chappie is the dog...)


« Reply #102 on: July 01, 2018, 09:34:23 PM »

Hi Skip
Fine to hear that all your wrk had good results, congrats!!!
Bill, doe the grid current and anode current also drift? 
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KD1SH
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« Reply #103 on: July 01, 2018, 09:50:04 PM »

    Haven't checked grid and plate currents at the oscillator yet, but at the PA they do show a slight change, in sync with the drift in power output.  The plate voltage at the 6146 drops with increasing power output and rises with decreasing power output, so that appears to be effect rather than cause.
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PA0NVD
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Nico and Chappie (Chappie is the dog...)


« Reply #104 on: July 01, 2018, 09:56:13 PM »

The anode voltage rises probably due to the decrease in anode current. See is the grid current also goes down when the power goes down. If it does, the problem should be the driver or oscillator stage. If not, check the G2 voltage. If stable, put a 10 000 pF ceramic from cathode to ground. May be the original cap is weak.
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