Chipotle .............
In a JTM-45, to my thinking, the KT66HP is the only way to go. It was the original tube.
If your amp has about 400 B+ and a GZ34 rectifier, get these in a #6, and bias at 36mA (some may say bias higher, but then the amp gets a bit harsh at some settings). Make sure V1-V3 are ECC83 and not 12AX7 or 7025 tubes (ECC83's were original and do sound different), and make sure V3 is a matched phase inverter, and not just matched for gain, but matched for rise time also, as in these amps, it is one piece of the magic. Myles,
Found this old post regarding the JTM45. I just bought one new that has the 2x5881 and 3xECC83. I like the sound now, but know what good tubes can do (ala THD Univalve). I was going to order from Watford (which is the best for me here in Italy- no customs or duties to pay). Just wanted to check with you first since you're the expert!
2xKT66 Harma
3xECC83 JJ Tesla
GZ34 Sovtek Rectifier (a GZ34 is in the JTM, but don't know what make)
Will I notice an improvement?
Do I have to do anything besides Re-bias?
Thanks Myles- You Rock!