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In Reply to: RE: Tube rolling question on phono preamp posted by dandaroy on October 23, 2020 at 18:46:18
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.
Follow Ups:
How did you figure that they were JJs. I heard they were Tungsols. If you take top cover off, you should be take the tube off the sockets, but the tube coolers are fixed to the stock tubes, so you have replace the tube without any coolers on them or buy new coolers. The general consensus is that coolers are BS. I just got the unit, so when I tube roll I will just replace the tubes without any coolers.
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I. Dandaroy
Re JJ 803 tubes: I was mistaken, but I thought that I'd read it somewhere...
I will figure out how I can (and whether I should) remove the top cover to replace the tubes.
you need a hex wrench to take the screws off.
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I. Dandaroy
Thanks, I will look for it.
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