Chaps, I have just bought a new amp, a Decware Zen SE84CW (older 2003 model of the version below).
It has a pair of EL84 tubes in the output stage, instead of the original SV83. I gather (and on the Decware site) that they are interchangeable, and require no bias change as its auto-bias.
To return it to original spec, where is best to find some SV83 tubes? There are a few places, they seem very cheap.
Also the Rectifier tube can be changed for a number of different models, including the 274B which is a common modification apparently over the original 5U4G.
Are these changes likely to make a massive change?
This is my first proper tube amp, I had the Consonance Cyber 10SE USB a good while back (a single ended KT88 amp) but I did not really have it long enough to play with other valves.