Not entirely sure that this is better than Hardware to place this but we'll see.... My fab Audio Note AN CD2 needs a new valve in its output stage as the old one has popped (it was the original so I'm not upset about this). On Monday it will come in for a service and a new valve. The existing unit was an EL34- the most common valve on the planet from what I understand. Is there something a bit more spicy that I could replace it with that has the same basic footprint? The limitation of the CD2 has always been the "one note" bass performance with certain music and if I could improve this (without going crazy) I'd be interested to know. Thanks for looking.