Someone told me about this the other day. So, I emailed Dennis and asked him to build one with a 5Z3 instead of a 5U4G. I have his LP27a preamp and 45/2A3 amp. The 45 is begging for a DHT to play with.
This monster featured tubes from the 20's. These are battery tubes from the roaring 20's and 30's.". I pooh-poohed his idea. On top of that when I tested it it did not work!! Well to speed things up.