[sdiy] Source for TDA-470's / String Ensemble bleed

[Eric Frampton]

Hi folks,

I’m trying to suss out why the top two octaves of my String Ensemble are now bleeding across notes (i.e. play one note, slightly hear a handful of others). I noticed this got worse after I rebuilt the power supplies. I’m guessing it’s the TDA470’s in the gate section - seems to happen in both Violin and Viola (4’ and 8’), and only in the top 16 or 20 notes of the keyboard.

Is there a reliable source for these? The seller of new ones on eBay right now looks kinda sketchy, and I don’t want to buy used ones.

Are there other failure points I should check in the actual unit itself?

Other symptoms are: the output is fairly low compared to a 100% working unit I have here, and the drop in level seems to happen before the chorus generators (i.e. the chorus generators are equally noisy in both units, but the uneffected signal level seems to be lower in my unit compared to the working one). And, the output is slightly scooped/hollow in the midrange, with or without the chorus switched in.

This is a Rev 1, btw.

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