So how did the Sylvainia 5751 grey work? Did you get a lower output? When i emailed the Pro-ject tech he had no idea if they would work and did reccomend them.
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The dampers just do not come off, you have to toss all. I have not tried any reissue tubes in this guy, but my impression of most of them is they sound pretty much the same in other gear ( I have not listened to Groove Tubes ). If you are looking for a Mullard like sound, you might try Some NOS American tubes like RCA Raytheon or Sylvania from the 1960's and see what you get...
Most of the tubes I tried were between $100 and $200 a pair for matched triodes and matched tubes.
Try Brent Jesse at audiotubes.com, he has a good selection and has been very helpful.
This is for Oceanica1 & Toufu....
You can take the dampers off the stock tubes. I use a dental floss and run it through the opening next to the resin that stuck to the tube and put it through the hole again and run it back up. Now grab both end of the dental floss and pull. The dental floss will break lose the resin from the glass of the tube and repeat the process. Once you done (3 on each tube)
you just push the tube off and it very easy. Let me know if you need any asistence.
Removing dampers: The trick with dental floss seems a brilliant solution - a pity I didn't read this before removing the dampers myself. I managed to remove the dampers from the included Tungsol tubes by moistening the resin with denaturized alcohol ("Antibac" always at hand; hifi-nerds use it for cleaning signal and power plugs) and in all futility attempting to insert a piece of thin, stiff plastic between the tube and the damper. The alcohol seemed to dissolve the resin somewhat. Finally it yielded, but I spent an hour on the pair. The Tube Box is now equipped with Genalex Red Lion re-issues.