I've recently recapped a Yamaha CR-1000, and it has an intermittent issue with the phono stage that is driving me a little crazy. The left channel will randomly get a sudden burst in volume, and it will usually stay like that for a minute or so before returning to the correct volume. It is very intermittent - it happens about once every 4 hours. I thought it might be a bad transistor, but the issue was still there (on the same channel) after swapping all the transistors from one channel to another. I also thought it might be a faulty trim pot, but the issue was still there after installing new. I also resoldered all the contacts on the board. The revision of the board is a little different than the schematic that is floating around on the internet, but it's similar enough that it may be able to provide some insight. Any ideas? Has anyone experienced a similar issue (yamaha or not)?
FYI the issue was there before the recap.
Thanks
FYI the issue was there before the recap.
Thanks