Dear all,
only few people had contacted me wishing to buy my Trident MK2. No one
bought it yet.
I just put it on Ebay. See here:
http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&item=110134683280Best,
Niels
Niels Ott schrieb:
> Hello there,
>
> my Trident MK2 is defective.
>
> Symptom: VCO 1 is defective for one voice.
>
> Up to now I was able to found out: Input 1 of IC704 (4x CMOS switch) on
> KLM-379 doesn't get the VCO signal on voice 7. On all others it does.
>
> There are some oddities with op amp IC707 but I'm not yet sure. The
> schematics and the circuit board design hint to the direction that IC707
> "feeds" IC704.
>
> The IC707 is a 4558, I assume that it is similar in the Polysix.
>
> Did anybody of you experience a similar problem? What about replacing
> the 4558, did this help?
>
> Furthermore, some of the 4558s carry a date stamp of 1997 which means
> they must have been replaced by an earlier owner.
>
> Unfortunately there is no shop selling electronic parts in reach so I
> can't just go for it and try replacing it. Mail order is an option but
> not for a few ICs...
>
> Thank you for commenting.
>
> Best,
>
> Niels
>
>
>
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
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>
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