What made you change to a 6SN7 preamp?

@invalid I paid $750 for 4 Psvane 6SN7 Globes and they were all microphonic.

$750 for a quad - where did you source them from? That’s interesting, you can buy a quad of PSVANE Cosor version globes for $259/quad. Can you share more...

It’s helpful to trace this back. FYI: info through an overseas distributor I learned of others having problems here in the USA with (some batches) of tubes that were packed properly (originally) coming from the Shenzhen factories. Then, arriving to some dealers, being unboxed from large lot boxes, then repackaged and packed loosely without cotton in smaller and less protective boxes. And, more subject to vibration and shipping damage to the buyers. Good tubes gone bad in reseller packing and shipping trying to save weight and shipping costs. Argh. It took TJFM and GDParts two years to figure this out and what was going on. Since then, I’ve been only buying the premium boxed pairs distributor-direct, and they come in their own individual foam insulated jewelry type boxes. Not in the individual cheap thin paper boxes loosely packed by dealer-resellers.

Ask the tube dealer reseller before they ship, how they are packed!  

Wondering how yours arrived, and for $750 sure seems questionable.

Decooney you have to ask Mglik about the quad of psvane tubes I was just quoting his post about vintage tube service.

@invalid  ok, did not see it as a quote. Will try again, Thx.  

@mglik same question, above. And did the tube reseller offer you a return, refund?

Ralph @atmasphere was my primary reasoning to try the 6SN7. No one is kinder, smarter and with incredible patience.  However, he hasn't been able to talk me into his class D AMPS yet.......

A week or two ago someone posted about removing the PreAmp from your system and go direct from the DAC . I tried for a week . It was clean, clear and had Dynamics  but........lacked  engagement . I of course but the pre back in the system yesterday . 

Ralph's UV-1 preamp gave me my first taste of 6SN7's. That small simple circuit produced a huge soundstage, music with weight, and layering of textures. I've moved on to another 6SN preamp and an Atma-sphere S-30 which uses (6) 6SN7 input tubes.