Space Varmint
New Member
I always liked the ECG612 but have trouble finding them. The data sheets I've looked at on various other varactor diodes just don't measure up. I believe NTE made an NTE612 as well.
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Apparently varactors are VERY difficult to come by these days, there was a company (now sadly closed) called MCES who specialised in tuner module repairs, we used them for years. For a long time before they closed, they were having massive problems trying to source replacement varactors for repairing duff tuners.
Yeah I've noticed that too. Well you do know that all diodes are varactors usually to a much smaller degree.
I want to know what happened to the germanium diode? I heard the military still gets them.
A rectifier diode actually makes a pretty decent varactor, with a good wide range - but for UHF you really need specific varactors, particularly as they are supposed to track together.
They are still easily available, used for detectors as they have always been.
Much too leaky for varactor use though - and in fact the most common failure of varactors is leaking slightly.