Tweaking Cary SLP-98P F1 Preamp


As you know for SLP-98, the F1 mod is a significant improvement over the standard. I just bought one used and the stock 6SN7 tubes that come with it are horrible. So, I am waiting for WE6SN7 tubes for it. Until it arrives I want to ask people with experience with F1. I have Pass X350.5 amp driving Soundlab ESL speakers.

1. How good can it get with best tubes?
2. Some have recommended using NOS 6f8g/adapter instead of 6SN7, any thoughts?
3. After getting the best tubes, is it still worth it to direct-couple it? It is supposed to improve bass, dynamics....
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I’ve been amazed by the improvements I have gained through using Symposium Rollerblock Jr’s under my VAC tube preamp. I think the Cary preamp will benefit as well speaking as a former SLP-98P owner (not F1). My Cary came across a bit lush and lacking a bit of detail and air. The Rollerblocks really improve these aspects.