Meta,
Interesting, I thought the Emission Labs could handle the stress the VAC put on 300B tubes. I know John L on Tubes asylum recommends the Svetlana 300B's but he states that unless you use a Variac to warm up your tubes, your failure rates will be high. I belive VAC uses Valve Art tubes. You should be OK using any of their tubes. I know the highly regarded TJ mesh plate tubes will not take the stress. Elecro Harmonix Gold grid tubes are supposed to be a great cheap alternative, Have not heard how they work in a VAC as yet. Sophia Electric Carbon plates are supposed to be THE tube. I contacted Sophia Electric and they stated that their Carbon Plates will work in a VAC amp but had an approximate 12% failure rate in the VAC amps. This coupled with the fact that they could not tell me the life expectancy of the tube dissuaded me. The other tube choice that intrigues me is the JJ 300B. Reviews on these are a mixed bag. It seems the SET guys say it is terrible, but the Push Pull guys say it is a fabulous tube. Vacuum tube Valley is very high on it. I dunno. I have seen several users of VAC amps use this tube. Western Electics are out of my price range due to the unavailability right now. Another intriguing tube is the Shuguang Treasure series 300B. very expensive at $600.00 a mathed pair. The Sovtek are supposed to be terrible as are the Richardson VAIC's. So sorry for the rambling, but I hope this info helps.
Interesting, I thought the Emission Labs could handle the stress the VAC put on 300B tubes. I know John L on Tubes asylum recommends the Svetlana 300B's but he states that unless you use a Variac to warm up your tubes, your failure rates will be high. I belive VAC uses Valve Art tubes. You should be OK using any of their tubes. I know the highly regarded TJ mesh plate tubes will not take the stress. Elecro Harmonix Gold grid tubes are supposed to be a great cheap alternative, Have not heard how they work in a VAC as yet. Sophia Electric Carbon plates are supposed to be THE tube. I contacted Sophia Electric and they stated that their Carbon Plates will work in a VAC amp but had an approximate 12% failure rate in the VAC amps. This coupled with the fact that they could not tell me the life expectancy of the tube dissuaded me. The other tube choice that intrigues me is the JJ 300B. Reviews on these are a mixed bag. It seems the SET guys say it is terrible, but the Push Pull guys say it is a fabulous tube. Vacuum tube Valley is very high on it. I dunno. I have seen several users of VAC amps use this tube. Western Electics are out of my price range due to the unavailability right now. Another intriguing tube is the Shuguang Treasure series 300B. very expensive at $600.00 a mathed pair. The Sovtek are supposed to be terrible as are the Richardson VAIC's. So sorry for the rambling, but I hope this info helps.