Just see if you can live with a heat source like 6 or 8 amps having tubes that will waste about 160W each (60W filament and 100W or more plate)
I actually used my tube amps to keep my room warm during this cold winter in California. I had the 45, 2A3, 300B, and GM70 running simultaneously at all times!
But you are only thinking 20 years ahead. 100 years from now when your tubes all get used up? Then all that work on the amp goes to nothing.
If you want DHT SET with low Rp (for good damping factor for midbass) then your selection is pretty limited and has already been mentioned. Are you looking for $10 tubes?
You can get brand new pair of 2A3 for $80 online at many places. These bias like 2A3 but have 300B ratings due to similar construction.
I have attempted DHT amps for my Tads a number of times and it is almost impossible to get the amp quiet enough unless a CCS load is used and even then microphony was still an issue . Although at 105dB , the sensitivity of your drivers is lower , nailing down any noise or microphony may still be an issue with just about any DHT , hence I would recommend a 6S45 spud amp . Before I had to ditch the Tads due to my baby daughter pulling on the horns , I had a very nice sounding 6S45 spud on the bench about to go in a box . This used a cascode depletion mosfet CCS load , three CSD01060 schottkys in the cathode circuit and a 230:6+6V toroidal mains transformer cap coupled in parafeed . Tried this on a JBL2420 /Azurahorn550 and it was adequately quiet , far more quiet than any DHT tried . Heater supplies were regulated DC though . Simple , cheap , maybe worth a try ?
316A
316A
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