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  1. #1

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    Default Re-tubing Jolida 502b

    Hello everyone!
    I have a friend that recently purchased a Jolida 502b and the previous owner advised that is overdue for new tubes.

    I feel certain that a few of you folks have owned one of these. Any suggestions of tube combinations?
    -Kevin
    ---------------------------------------------------------------
    HT: Philips 52PFL7432D 52" LCD 1080p / Onkyo TX-SR 606 / Oppo BDP-83 SE / Comcast cable. (all HDMI)

    Polk LS 90's - Front
    Polk CS350 LS - Center
    Polk Monitor 50's - Rear
    JBL Northridge E150P - Sub

    2 Channel:
    Oppo BDP-83 SE
    Muscial Fidelity M1 DAC
    VTL 2.5
    McIntosh 2205 (refurbed)
    Polk LS90's (spiked & tweeked)
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  2. #2

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    Sylvania has some nice, cheap NOS 12AT7's that go well in my 302. The ones I use have bold yellow lettering. Sovtek 12ax7's were a nice addition for mine as well, though one recently crapped out on me.
    Usher CP-6311, Shuguang S200MK, Shuguang S845MK, Pioneer BDP-51fd, Essence Audio HDACC, Douglas IC's, Douglas Alpha bi-wire SC's, Pangea/Douglas PC's, Epson 8100

  3. #3
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    I've enjoyed Gold Lion tubes in all the equipment I've owned.

  4. #4

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    What kind of sound do you like? That might depend on what kind of tube you should try.

  5. #5

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    I am inquiring on behalf of a friend. He is a jazz listener (mostly), but I can't really speak to his preferences. He is a
    tube newb and I am far from an expert. I imagine we will be doing some rolling of the pre-amp tubes but I know nothing about the power tubes (KT-88's?) or which brands would be recommended.
    TIA for the help!
    -Kevin
    ---------------------------------------------------------------
    HT: Philips 52PFL7432D 52" LCD 1080p / Onkyo TX-SR 606 / Oppo BDP-83 SE / Comcast cable. (all HDMI)

    Polk LS 90's - Front
    Polk CS350 LS - Center
    Polk Monitor 50's - Rear
    JBL Northridge E150P - Sub

    2 Channel:
    Oppo BDP-83 SE
    Muscial Fidelity M1 DAC
    VTL 2.5
    McIntosh 2205 (refurbed)
    Polk LS90's (spiked & tweeked)
    Cardas IC's
    Cardas Bi-Wire

  6. #6

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    when i had my 502b the tubes i used were, eh kt88, tung sol reissue 803s gold pin for 12ax7.s, and either a ge 6201 or mullard cv4024 for the 12at7 tube.
    you can also use 12au7's all the way across.
    Main system
    http://forum.audiogon.com/cgi-bin/fr...pin&1162599347 Freelance reviewer for StereoMojo

  7. #7

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    Interesting, Marvda. What advantage would there be to using 12au7's in all of the four preamp sockets?
    -Kevin
    ---------------------------------------------------------------
    HT: Philips 52PFL7432D 52" LCD 1080p / Onkyo TX-SR 606 / Oppo BDP-83 SE / Comcast cable. (all HDMI)

    Polk LS 90's - Front
    Polk CS350 LS - Center
    Polk Monitor 50's - Rear
    JBL Northridge E150P - Sub

    2 Channel:
    Oppo BDP-83 SE
    Muscial Fidelity M1 DAC
    VTL 2.5
    McIntosh 2205 (refurbed)
    Polk LS90's (spiked & tweeked)
    Cardas IC's
    Cardas Bi-Wire

  8. #8

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    more choices for different sound plus i had a ton them on hand.
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    http://forum.audiogon.com/cgi-bin/fr...pin&1162599347 Freelance reviewer for StereoMojo

  9. #9
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    It would also matter what speakers he is pairing the amp with also. The Gold Lions, for example, will be very detailed but less warm, which could be a bad match for some speakers.

  10. #10

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    I have a friend that recently purchased a Jolida 502b and the previous owner advised that is overdue for new tubes.
    The previous owner probably meant the power tubes as their lifespan is considerably shorter than the signal tubes. What tube brands are in it now? Does your friend like the sound as is?

    I imagine we will be doing some rolling of the pre-amp tubes but I know nothing about the power tubes (KT-88's?)
    For the KT88's, Shuguang Treasures.
    'Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end."

  11. #11

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    Thanks, Jesse.
    I have yet to lay eyes on the thing, but it probably has the original tubes. I'll see if he knows offhand. He does like the sound so far, but he really just hooked up last night. Replacing the power tubes and a bias is the first thing he asked about doing.
    -Kevin
    ---------------------------------------------------------------
    HT: Philips 52PFL7432D 52" LCD 1080p / Onkyo TX-SR 606 / Oppo BDP-83 SE / Comcast cable. (all HDMI)

    Polk LS 90's - Front
    Polk CS350 LS - Center
    Polk Monitor 50's - Rear
    JBL Northridge E150P - Sub

    2 Channel:
    Oppo BDP-83 SE
    Muscial Fidelity M1 DAC
    VTL 2.5
    McIntosh 2205 (refurbed)
    Polk LS90's (spiked & tweeked)
    Cardas IC's
    Cardas Bi-Wire

  12. #12

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    Quote Originally Posted by zingo View Post
    It would also matter what speakers he is pairing the amp with also. The Gold Lions, for example, will be very detailed but less warm, which could be a bad match for some speakers.
    He is driving Paradigm Titans
    -Kevin
    ---------------------------------------------------------------
    HT: Philips 52PFL7432D 52" LCD 1080p / Onkyo TX-SR 606 / Oppo BDP-83 SE / Comcast cable. (all HDMI)

    Polk LS 90's - Front
    Polk CS350 LS - Center
    Polk Monitor 50's - Rear
    JBL Northridge E150P - Sub

    2 Channel:
    Oppo BDP-83 SE
    Muscial Fidelity M1 DAC
    VTL 2.5
    McIntosh 2205 (refurbed)
    Polk LS90's (spiked & tweeked)
    Cardas IC's
    Cardas Bi-Wire

  13. #13

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    If they are the stock tubes, just about anything will sound better. That said, get him to buy the Treasures.....well worth the price.
    'Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end."

  14. #14

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    Right on. Thanks, Jesse. You haven't steered me wrong yet!
    -Kevin
    ---------------------------------------------------------------
    HT: Philips 52PFL7432D 52" LCD 1080p / Onkyo TX-SR 606 / Oppo BDP-83 SE / Comcast cable. (all HDMI)

    Polk LS 90's - Front
    Polk CS350 LS - Center
    Polk Monitor 50's - Rear
    JBL Northridge E150P - Sub

    2 Channel:
    Oppo BDP-83 SE
    Muscial Fidelity M1 DAC
    VTL 2.5
    McIntosh 2205 (refurbed)
    Polk LS90's (spiked & tweeked)
    Cardas IC's
    Cardas Bi-Wire

  15. #15

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    Another vote for the Treasures!
    JC approves....he told me so. (F-1 nut)

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    If he doesn't want to spend a ton have him try the EH or regular Shuguang KT88's first. You can get matched quads very reasonably on Ebay for both. I've tried EH, Shuguang, Shuguang Treasures and JJ. I've gone through 3 quads of the EH, and tried the others once each. The Treasures didn't last long enough for me to shell out that kind of cash again, but I got them from an Ebay seller so maybe they weren't grade A's....I don't know. This time I decided to try the regular Shuguang and they look 100% identical in every way to me except for the colored glass (I had previously broken a Treasure so I was able to examine it very closely). I've got the Shuguangs fully burned in now and like them a lot.
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    Parasound A21, PerfectWave MKII w/bridge, EE Minimax pre w/Tutay mods, Martin Logan Source speakers, Kimber 4TC, Gabriel Gold Rapture V3 IC's, Ps Audio AC5, AC3 and Pangea AC14XL power cords

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  17. #17

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    Where/who did get regular Shuggies from?
    Thanks
    JC approves....he told me so. (F-1 nut)

  18. #18

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    Quote Originally Posted by george daniel View Post
    Where/who did get regular Shuggies from?
    Thanks
    I got mine from this Ebay seller but at the time he was selling matched pairs for $55. You could probably email him and ask for matched pairs/quads though.
    http://www.ebay.com/itm/KT88-98-VACU...item230f4d53be
    ____________________________
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    Parasound A21, PerfectWave MKII w/bridge, EE Minimax pre w/Tutay mods, Martin Logan Source speakers, Kimber 4TC, Gabriel Gold Rapture V3 IC's, Ps Audio AC5, AC3 and Pangea AC14XL power cords

    HT
    Pioneer Elite VSX-21TXH, LG 60PK550 plasma, Panasonic DMP-BDT210 BDP, DTV HD receiver, SB Touch, 5 x Polk Audio RC85i
    Computer rig - Windows 7/ JRiver, M2Tech HiFace 2 w/external battery power, Grant Fidelity TubeDac 11, Fostex PMO.4n monitors

  19. #19

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    do you think the level of performance of the 502b justifies the expense of the treasures?
    Main system
    http://forum.audiogon.com/cgi-bin/fr...pin&1162599347 Freelance reviewer for StereoMojo

  20. #20

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    Another vote for the treasures. I'm running a pair of 12AU7's in my preamp and they sound fantastic.
    NEW P-3 Pre: RCA 12BH7 2 X Brimar CV4034's
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  21. #21

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    Quote Originally Posted by dragon1952 View Post
    If he doesn't want to spend a ton have him try the EH or regular Shuguang KT88's first. You can get matched quads very reasonably on Ebay for both. I've tried EH, Shuguang, Shuguang Treasures and JJ. I've gone through 3 quads of the EH, and tried the others once each. The Treasures didn't last long enough for me to shell out that kind of cash again, but I got them from an Ebay seller so maybe they weren't grade A's....I don't know. This time I decided to try the regular Shuguang and they look 100% identical in every way to me except for the colored glass (I had previously broken a Treasure so I was able to examine it very closely). I've got the Shuguangs fully burned in now and like them a lot.

    I should have made it more clear that I was strictly talking about power tubes. I have been running the Treasure 12AU7 x 4 and the 12AX7 x 1 and am perfectly happy with those. The power tubes sounded awesome, just didn't last as long as I would have liked.
    ____________________________
    2 - channel
    Parasound A21, PerfectWave MKII w/bridge, EE Minimax pre w/Tutay mods, Martin Logan Source speakers, Kimber 4TC, Gabriel Gold Rapture V3 IC's, Ps Audio AC5, AC3 and Pangea AC14XL power cords

    HT
    Pioneer Elite VSX-21TXH, LG 60PK550 plasma, Panasonic DMP-BDT210 BDP, DTV HD receiver, SB Touch, 5 x Polk Audio RC85i
    Computer rig - Windows 7/ JRiver, M2Tech HiFace 2 w/external battery power, Grant Fidelity TubeDac 11, Fostex PMO.4n monitors

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