Eddystone: RF gain potentiometers logarithmic |
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Forum » Histoire des fabricants /marques » FABRICANTS / MARQUES dans les Musées de Radio » Eddystone: RF gain potentiometers logarithmic
Martin Bösch 
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CH Articles: 594 Schémas: 105 Images: 2352 28.Apr.07 22:51 Remerciements: 11 |
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In Eddystone User Group Newsletter 50 I found the following useful information an replacing RF gain pots in Eddystone receivers: Usually AF gain pots are logarithmic carbon types, RF gain pots usually used linear wire-wound types. After replacement of RF gain potentiometers with common linear ones, many listeners found that the whole RF gain control range was passed through in the last eigth of a turn. A careful inside inspection of a Eddystone RF gain pot revealed, that in that wire wound potentiometer three different thicknesses of resistance wire had been used. The first third in 10 kOhm pot is linear 0 - 500 Ohms, the second third 0 - 2000 Ohms, the third bit 0 - 7500 Ohms, so the whole makes 10000 Ohms. So consider trying to clean out Your Eddystone RF - gain pot instead of simply replacing it with a 10 kOhm linear one, otherwise Your RF-gain control might suffer from the "Switch Syndrome"... Hope that helps, kind regards Martin |
