I've been using JAN GE 5670W tubes in my Liquid Platinum. I like their sound and love their price. Very high on the bang for the buck scale along with good sound quality. I consider the sound to be generally similar to the Gold Lion new production 6922 tubes. The only negative aspect with the 5670W in the Liquid Platinum is that there is an audible hum through the headphones as the tubes warm up. Takes about 10 minutes or a bit more for the hum to go away when using Audeze headphones.
The 5670W does require an adapter.
TubeDepot sells the tube with an adapter for $25 per tube. You can also find the tubes from other sellers and eBay for less.
iFi Audio uses the 5670W tubes in their hybrid amps. And several years ago they were selling the 5670W with a custom adapter as a 6922 substitute for other amps. They wrote up a PDF white paper to promote the 5670W as a 6922 substitute. The white paper is heavy on promotion. Link to the PDF here:
iFi white paper on the GE 5670W tube
If you're looking for bang for the buck and are willing to use a tube that requires an adapter then the GE 5670W is worth a try.
Anyone know why the GE 5670W causes a hum through the Liquid Platinum as the tubes warm up? Is it something specific about Liquid Platinum circuit? The iFi socket adapter had a capacitor on the heater pin to filter out power noise or something. Would an adapter that has a little capacitor like that help get the GE 5670W to be quiet during warmup?