Tube newbie needs help with 6922 recommendation

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I need some guidance on upgrading the 6922 in my Assemblage L1 Signature preamplifier (Sonic Frontiers SFL1 Signature successor)
It has the stock 6922 in it. I have no information about the manufacturer. The manual says it can handle a 6922/E88C/6DJ8/ECC88 tube type.
I am looking for a replacement that will provide greater detail and increased imaging. Right now I feel the sound is kind of bland and 2 dimiensional when mated with a Plinius SA-50, with less detail and PRAT when compared to a Teac Reference 100 receiver and a Technics SA SU7700 integrated amplifier.
What should I consider, how much should I expect to pay and what are some good sources for purchase for a replacement tube? Will I be able to get significant improvements by changing the tube or should I just sell it and start over?
I could replace the tube with a 12AT7 but this requires removing the circuit board to move a jumper some I am loathe to attempt this unless I can expect a huge improvement in the sound quality. There's no easy access to the underside of the circuit board.

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Topic - Tube newbie needs help with 6922 recommendation - Doublej 18:26:38 03/22/06 (2)

Re: Tube newbie needs help with 6922 recommendation - Dave Pogue 17:00:56 03/23/06 (0)

Some places to start - CometCKO 19:49:32 03/22/06 (0)

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