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In the Forum: Analog Playback
In the Thread: The last phonocorrector: “End of Life" Phonostage
Post Subject: That crazy 7025.Posted by Romy the Cat on: 11/22/2011
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 AlexBerger wrote:
I think I should to give some break-in time to Sylvania 0a2.
50 hours is enough?

Previously I used in my EAR the next set of tubes ECC83: 1-Amperex (red print), 2-Amperex (red print), 3-Sylvania 7025 (yellow print).
When I built "End of Live", I used tube set exactly lake you do: 1-Telefunken (smooth plate), 2-Sylvania 7025 (yellow print), 3-Telefunken (smooth plate).
(But my Sylvania 7025 is not specialty strong...)
Now I changed Sylvania 7025 to Amperex (red print). IMHO the sound is steel natural and well balanced but more refined.
I do not know about the break-in of gas tubes.

My Sylvania 7025 for whatever reason has twice (!!!) transconductance then my input and out tubes. My tube tester is well celebrated and the Telefunken 12AX7 that I use are well within the normal operational limits. The 7025 max out the tube tester and I need to switch the load in order to any sensible reading. I have no idea why it behaved this way but I like sound less when replaced that “crazy 7025” with good Telefunken 12AX7.  I do have some Amperex and I might try them another day if I develop more interest to play with tube rolling.

The Cat

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