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Tube upgrades for Jolida 502B?

I realize this is something that has come up before, though in searching the archives I didn't come away with a clear path forward. My amp is completely stock and came equipped with Sovtek 6550s. Using it to drive Totem Forest speakers. I contacted Jolida. They recommend KT88s. Their reply is a bit unclear but they might be suggesting Electro Harmonix. They also indicate reliability issues with Chinese KT88s. Response Audio (Jolida dealer and modder) recommends Shuguang KT88s (Chinese). The Tube Store recommended JJ Tesla KT88s on the strength of their great imaging and deep bass (more bass being something I was looking for). I was initially leaning towards SED Winged "C" 6550s. Now I am a bit more confused. I'm curious about KT88 vs 6550 sonics and reliability differences. Thanks in advance to any one willing to take the time to share their experience and preferences.
128x128ghosthouse
jedinite24's avatar
jedinite24
1,502 posts
 
You might want to confirm with Jolida but to me the only difference between the 502B and the 502P is that the 502B has volume, input controls and subwoofer output. Other than that the Amplifier section is the same.
wolf_garcia
4,650 posts
 
I have to wonder what difference better 12at7s would make as I have been told that particular tube purpose (driver/phase inverter) is somehow less important. I welcome any opinions about that, as long as they aren't meant to intentionally upset me.
wolf_garcia
4,650 posts
 
Based on an entertaining conversation with a really cool and tube savvy woman at thetubestore, I ordered a pair of matched section JAN Philips 12at7s...they may or may not be the best option but she was so much fun to talk to (maybe I need to get out more) it's worth the relatively small cost to find out.
tbromgard
787 posts
 
interesting-thanks
tbromgard
787 posts
 
Thanks for the responses. Now can anyone explain how to bias tubes in the 502brc? I dont have the owners manal
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