Pre-amp Upgrade

I believe the Shindo pres are a game changer. The auriges were for me. If you want super hyped detail then the Shindo is not for you. If you want a powerful emotional experience and know the sound of live music then you must here the Shindo

I've owned VTL 5.5 and CJ 16LS 2. VTL creates big open dynamic sound that sparkles. CJ sounds smooth and mellow. Currently I use ARC VSi60 which is an integrated amp with passive pre. To my ears ARC sounds more transparent and musical than either of them.

Have you considered the CJ PV-15? It is neutral and dynamic. Or perhaps you would consider it a step down?

Take a listen to the VAS Citation I. Built to a classic HK tube pre amp design, it may have all the detail you are looking for. Its MSRP is about $5K. I use it with VAS mono blocks. Great match, great sound.

If you enjoyed your LS-15 and want the same sound signature, but (a lot) more of it, the LS-26 is a wonderful amp.

Personally, I like the synergy of CJ amps and preamps together. If you can find one, the CT-6 is the unsung hero of the CJ preamp lineup - it's like getting 90% of the sound from a CT-5 for less than 1/2 the price. The CJ pre that sounds most like the ARC gear IMHO is the PFR. I know that you want tubes, but it's a great preamp and is available for a very reasonable (aka cheap) price.