The Jolida 302 uses EL34's/6CA7's not EL84's or 6BQ5's. El34's will set you back at least couple bills. I would suggest you try a matched quartet. Visit Jim McShane at the following link. If AG removes this link then google it and type in Jim McShane tubes and it should be the first item.
http://pages.prodigy.net/jimmcshane/
and he will guide you through your tube ailments. He has enough knowledge to help you choose a set of tubes that will help you tailor you sound. If you are looking for more detail he would be able to suggest something that may give your amp new life. I would also talk to him as well as Jolida to see if they have any modifications that will improve on the areas you want improved. Some amps benefit tremendouslly from replacing the coupling caps. Some require power supply upgrades. But I would try a matched quarted of EH Electro Harmonics EL34's in the Jolida first. They will cost roughly $55 or so depending on shipping. The EH's offer an extended top end that has been better than several other brands I have tested lately. a righteous midrange and these tubes offer a pretty good and solid soundstage. I have tried at least 4 of the major brands on new tubes and the EH's gives me a more complete sound top to bottom.
If you are looking for a more detailed sound this may be the ticket. If you want a warmer sound look elsewhere.
Talk to Jim about the 12AX7 and 12AT7's for the input. Make sure they are low in microphonics. Prices are righeous and he has some NOS tubes too. I searched for a month trying to find a new supplier of tubes for my amp and I'm glad I found Jim. There are many and I mean many people selling tubes. Buy from someone that backs their tubes with a reasonable warranty. And all the tubes are tested by hand to give you the best quality I have seen in a while. I'm not taking anything away from some of the big players out there but I get the service of the big boys with prices that won't make you loose any sleep.
http://pages.prodigy.net/jimmcshane/
and he will guide you through your tube ailments. He has enough knowledge to help you choose a set of tubes that will help you tailor you sound. If you are looking for more detail he would be able to suggest something that may give your amp new life. I would also talk to him as well as Jolida to see if they have any modifications that will improve on the areas you want improved. Some amps benefit tremendouslly from replacing the coupling caps. Some require power supply upgrades. But I would try a matched quarted of EH Electro Harmonics EL34's in the Jolida first. They will cost roughly $55 or so depending on shipping. The EH's offer an extended top end that has been better than several other brands I have tested lately. a righteous midrange and these tubes offer a pretty good and solid soundstage. I have tried at least 4 of the major brands on new tubes and the EH's gives me a more complete sound top to bottom.
If you are looking for a more detailed sound this may be the ticket. If you want a warmer sound look elsewhere.
Talk to Jim about the 12AX7 and 12AT7's for the input. Make sure they are low in microphonics. Prices are righeous and he has some NOS tubes too. I searched for a month trying to find a new supplier of tubes for my amp and I'm glad I found Jim. There are many and I mean many people selling tubes. Buy from someone that backs their tubes with a reasonable warranty. And all the tubes are tested by hand to give you the best quality I have seen in a while. I'm not taking anything away from some of the big players out there but I get the service of the big boys with prices that won't make you loose any sleep.