I just got this amp and don't what year it is, i know that the power switches are different from year to year so i just need to know what years they used this design if anyone knows for sure.
This is a TR-100 combo with a 15 inch speaker, it has a rickenbacker amp with a "road" cabinet, i've seen some amps similar to this but never seen one like this, so can anyone give me some information on this mystery amp?
I think my preamp tube blew up in my SWR 550x, they said that 12AX7A preamp tube are used in them, I've found many different tubes that are very similar, like 12AX7EH and many others, does it matter if they tube is exactly the same or not?