Got the Korg CM-100 pickup today and it works fine with the Korg tuner. We get the same reading using the internal microphone and the pickup. We did see the exact phenomena described by Bill D above, to wit ..."(I do get a # reading on the initial pluck, but it settles in to steady reading after a moment, and I tune after that pause." So, apparently the Matrix pickup is not compatible with the Korg tuner. Maybe the reason will come to us in a dream some day.

Now, about the old Seiko tuner. We don't think the problem is that the lever in the jack that's supposed to disconnect the internal microphone is the problem. When we connect the pickup to the tuner, the usual result is no reading whatsoever. If we wiggle the plug and talk very nicely to it, it makes contact and the tuner works fine with the pickup until the next time we take it out or until we jostle the plug accidently. We tried using some of that magic elixir that cleans contacts and pots but it didn't help.

We took the Seiko apart for a preliminary inspection and found that the jack is soldered directly to the circuit board and one of the joints could be loose. But, the jack itself is very hard to access and we would have to remove the meter first which is also soldered to the board. Also, the jack is very small and plastic, not like any other jack we've ever seen for sale.

It is not that we're "not experienced with such repairs". On the contrary, we're quite experienced and many of the experiences have been bad ones! A new Korg tuner only costs about $20 so it's hardly worth fooling with the old one but when we have more time we'll probably try to fix the old Seiko even though there's considerable risk of destroying it. In the meantime we'll have a backup tuner.

Bev and Jerry