Vintage Synth Explorer Forums

I picked up a TR-606 off eBay the other day and have noticed that it is outputting a very high pitched tone. Sometimes this tone is a little louder when I connect other CV gear to it.
Does anyone have any experience with this and know how I might be able to repair it? Thanks.

probably the transformer. Try running it off of batteries and see if it still does it

Yeah, mine does this, quietly enough not to worry. It's just electronic noise from all the gubbins inside being tightly packed, I think. Turn it up enough and there's a pulse; could be the CPU or clock. Anyhow, some kind of gate should sort it out.

yr right, it doesn't grumble wit batteries. i think i'm going to buy one of those roland power cords. i don't have the original and have been using one of those radio shack adapters. thanks.

i don't have the original and have been using one of those radio shack adapters

Be really careful with that, the 606 draws very little current and using a high rated PSU (say 500 mA) may result in a high voltage issue since most transformers get a little squirrelly when your only sucking ~100 mA through them. The orginal boss one is a 200 mA max. Using a unsuitable PSU is a common failure mode for the power transistor on both the 606 and 303 since pumping more than 9 V through it degrades it pretty quickly

Altitude wrote:Be really careful with that, the 606 draws very little current and using a high rated PSU (say 500 mA) may result in a high voltage issue since most transformers get a little squirrelly when your only sucking ~100 mA through them. The orginal boss one is a 200 mA max. Using a unsuitable PSU is a common failure mode for the power transistor on both the 606 and 303 since pumping more than 9 V through it degrades it pretty quickly

As long as your power supply is regulated it should provide a constant, fixed voltage even with a relatively low current draw. But yes, you won't want a 1.5A wart or anything like that.. Just get a regulated 300mA 9V supply from any manufacturer, you don't need an original Roland one. I use a bunch of those switchable ones with the interchangeable plugs. Pity they don't sit next to each other on the distribution board though, slightly too wide. Grr!

As long as your power supply is regulated it should provide a constant, fixed voltage even with a relatively low current draw.

This is true, however most cheapo wall warts are not regulated an they rarely say if they are.

Here's a site about the issue:

http://www.firstpr.com.au/rwi/dfish/rel ... l#adaptors