Matt,
Tube rolling is not the beez kneez, but a useful tweak for gear. For the Big 7, you only have a few parameters to change. You can rioll the rectis, but the stock stuff ia already very performant. Then you can roll the output tubes with vintage RCA/Cunningham 45 triodes globes (circa$150 pair), PSVANE WE Replica 101d-L, or 45 triode ST shape ($100 a pair). For the 2A3 lovers they have many rolling options, but some thing they are microphonic.
The consensus is that the 274b will be the best recti and that vintage RCA globe 45s will give the best result, and that the Psvane WE replica sounds very, very decent but YMMV.
Remember this a DHT Dac, so no small tubes allowed!
Tube rolling is not the beez kneez, but a useful tweak for gear. For the Big 7, you only have a few parameters to change. You can rioll the rectis, but the stock stuff ia already very performant. Then you can roll the output tubes with vintage RCA/Cunningham 45 triodes globes (circa$150 pair), PSVANE WE Replica 101d-L, or 45 triode ST shape ($100 a pair). For the 2A3 lovers they have many rolling options, but some thing they are microphonic.
The consensus is that the 274b will be the best recti and that vintage RCA globe 45s will give the best result, and that the Psvane WE replica sounds very, very decent but YMMV.
Remember this a DHT Dac, so no small tubes allowed!