It would be useful to note that 6922 is not exactly similar to 6DJ8 or 7308 though they sprouted from the same family tree over a period in history. Unless a tube is specifically labelled such, even suggested European interchangeability I guess are based on industrial instruments or radio applications.
Be aware which tube designation number is originally specified for the particular audio circuit before we start rolling within the same tube id. Hopping across numbers even within the same tube family is often a "dicey", expensive and endlesly frustrating activity. I have several 6DJ8's I cannot use to testify that it is so. My MF tube buffer calls for 6922, nothing else.
So making good judgement which tube sounds better for this thread should rightly refer to 6922 brands & versions.
A useful data site http://tdsl.duncanamps.com/show.php?des=6922
Be aware which tube designation number is originally specified for the particular audio circuit before we start rolling within the same tube id. Hopping across numbers even within the same tube family is often a "dicey", expensive and endlesly frustrating activity. I have several 6DJ8's I cannot use to testify that it is so. My MF tube buffer calls for 6922, nothing else.
So making good judgement which tube sounds better for this thread should rightly refer to 6922 brands & versions.
A useful data site http://tdsl.duncanamps.com/show.php?des=6922