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RE: Tube rolling question on phono preamp

Posted by Akolegov88 on October 26, 2020 at 00:49:58:
I have the same phono preamp. It appears that the stock tubes are JJ ECC 803S, which are not bad.

However, when I tried to open it in order to try various NOS ECC83 tubes, I could not open the cover because the screws wouldn't go (and I couldn't find the proper tool). I could open the circular covers on top, but still could not get access to the tubes. Even if one manages to open the cover and get access to the tubes, he would have to break the corrugated heat dampers (or whatever they are), so I gave up the idea.