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  1. #1
    Super Wammer AlanB's Avatar
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    Post imported post

    As I said in my other threads these valves are very, very special in terms of sound quality.

    Remember they arrived on Thursday last and were fine to Saturday. A friend visited and during that visit we compared my curfent interconnect fave with another. When I switched the amp back on within a few minutes one of theKT88's shone very bright orange/red. I switched off and waited -thinking that maybe I didn't wait long enough for 'cool down'. When I switched on again all was well.

    I switched the position of the valve to eradicate a possible amplifier problem. All went well on Sunday and Monday.

    This morning I switched on and and left the room for the system to warm up for 10 minutes. WhenI entered the room the same valve (in the new position) was aglow. Switched off and waited. Switched back on and all seemed well. Within half an hour another two valves did the same thing. Frightening!! Can't possibly leave the room with the system playing. Lorenz has agreed with my opinion that the valves haven't been tested long or thoroughly enough and has agreedto give me a full refund.

    The Gold Lions are behaving impeccably so it isn't an amplifier problem.

    Aaah but I do miss that fantastic sound.

    Here is what the glow looks like.Scary??

    Note: The12AX and AU7's are fine and sound great.



    Go placidly amid the noise and the haste and remember what peace there may be in silence.
    Avoid loud and aggressive persons. They are vexations to the spirit.
    Desiderata


  2. #2
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    Post imported post

    I've never seen or heard of anything like this before. Not that I'm an expert - far from it.

  3. #3
    Price Discovery Bitch i_should_coco's Avatar
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    Post imported post

    Is the amp self-bias? Or adjustable? If adjustable, it could be that they are set to run too hot?

    Most likely faulty tubes, tho'...
    CD players - computer audio for dummies.

  4. #4
    Super Wammer AlanB's Avatar
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    Post imported post

    Totally automatic self biasing.

    Bloody frightening. Who needs to go to the Blackpool lights.

    Funny thing also is that I sat for a little while hoping they would right themselves and the sound didn't suffer in any way.




    Uncle Ant (below) - one duff in four - ok -but three!!
    Go placidly amid the noise and the haste and remember what peace there may be in silence.
    Avoid loud and aggressive persons. They are vexations to the spirit.
    Desiderata


  5. #5
    Sceptical Wammer
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    Post imported post

    I've had a valve do that - it was duff

  6. #6
    Super Wammer rockabillybass's Avatar
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    Post imported post

    Alan, are you getting replacements or your money back?

    They're worth another try I'd have thought.
    Met a woman in a bar
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  7. #7
    Super Wammer JANDL100's Avatar
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    Post imported post

    Well, power valves do that sometimes. Some makes are more prone to it than others - I had a series of similar problems with GEC 6550 valves. Gave up in the end (aftera Lumley monoblock amp had suffered meltdown ) and changed to somevery nice sounding Sovtek WE clones ...

    Just one valve going heavenward shouldn't cause you to abandon the brand, but 3 out of 4 is a bit extreme!

    Shame they sound so good.

    Life's too short for boring hifi!

  8. #8
    Super Wammer matt.c's Avatar
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    Post imported post

    Sorry to hear this Alan,they sounded absolutely magical

    Hope you get it all sorted quickly

  9. #9
    Sceptical Wammer
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    Post imported post

    Alan, I hadn't realised you had three valves doing this. Three is a lot less likely than one certainly. If you have another set of valves to try and they don't do it then I can't see what other conclusion there is. If you have another set and they do then a problem with the amp would seem more likely. I had exactly this happen on one KT88 valve, once and it was a duffer - a Svet C with a thousand or so hours on it - had Hotrox measure it and it was on it's last legs. One thing I do know, valve plates shouldn't glow red.

  10. #10
    adamus
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    Post imported post

    3 out of four seems a little worrying.

    have you had anyone check over the amp to see what operating points it set for.... it could just be set on the hot side and these are rated quite so high... so runaway.

    or it could be that they are faulty

  11. #11
    Down And Out mighty ant's Avatar
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    Post imported post

    I was interested in TJFM 211 power valves and contacted the importer about them. He also imports 211 monoblocks and I assumed that he would be using the TJFM output valve in the amp. Wrong! He said that he had too many "issues" with the valve and would not be importing anymore of their power valves.

    Took the hint and have stayed away from their power valves. I only asked about the power valves, nowt else, for what it's worth.
    "He who increases knowledge increases sorrow" Live in ignorance and be happy.

  12. #12
    Acc shut see Purité North
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    Post imported post

    Blimey, that's impressive! Shiddy luck they happen to sound so good...

  13. #13
    Super Wammer AlanB's Avatar
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    Post imported post

    Tony (UncleAnts)has put it to me that there may be a compatibility problem with the Primaluna in view of the fact that THREE valves went berserk and I agree it does seem unusual. Remember that PL boasts that their auti-biasing will cope withany KT88, KT66, EL34and many others will work fine. Believe me a valve tart like me has tried almost every type and the amplifier has never missed a beat.

    I have written to Herman (Mr PL)who tells me that he knew of the TJ signal valves and saysthey are actually the Primaluna Gold Valves. Praise indeed for TJ. He wasn't aware they made a KT88 and in view of my experiences and the horror photograph he has promised me he will visit TJ's when next in China and try to find out what the problem is. I'll feed back when he comes up with the answer, or, possibly, non-answer.




    Go placidly amid the noise and the haste and remember what peace there may be in silence.
    Avoid loud and aggressive persons. They are vexations to the spirit.
    Desiderata


  14. #14
    02GF74
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    Post imported post

    that has got to be some internal fault - I am no expert by any means but valves have a heater and for sure, that big plate is not it.


    did you sort it?

    did you try swapping valves around to see if proble stays with valve or stays with the socket?

  15. #15
    Super Dooper Wammer robin's Avatar
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    Post imported post

    i had a e h 6550 do just this, it was over a year old, i contacted guy sergent about it and he said it had "locked up " rare but does happen, the next time i put the amp on it was ok again, but replaced it anyway
    django pre leak st 20 tannoy 15" MG s

  16. #16
    Super Wammer AlanB's Avatar
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    Post imported post

    02GF74 wrote:
    that has got to be some internal fault - I am no expert by any means but valves have a heater and for sure, that big plate is not it.


    did you sort it?

    did you try swapping valves around to see if proble stays with valve or stays with the socket?
    I said in my orginal post that I moved the position of the valve. The valves have been returned to TJ with full refund. They are going to test them to seewhat has gone wrong.
    Go placidly amid the noise and the haste and remember what peace there may be in silence.
    Avoid loud and aggressive persons. They are vexations to the spirit.
    Desiderata


  17. #17
    Super Wammer AlanB's Avatar
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    As a late reply TJ have never come back with an explanation and Herman (Mr PL)only says the Chinese never tell you anyhting. That's a funny one isn't it.
    TJ are brinigng out a new KT88 htis month (June) and my dealer has offered to send me a set without payment and if I like them I pay and if not return them and just pay his postage.
    I know one thing....I won't take my eyes off them for the first couple of weeks.
    Go placidly amid the noise and the haste and remember what peace there may be in silence.
    Avoid loud and aggressive persons. They are vexations to the spirit.
    Desiderata


  18. #18
    Registered utahusker's Avatar
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    My first post here. Alan what sonic differences did you notice between the TJ's and the Gold Lion's? I might be a moot question since the TJ's are faulty.

    By the way, my Gold Lions are the best new tube, err valve I've owned.

  19. #19
    Super Wammer AlanB's Avatar
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    Hi and welcome to the Wam. We try to make everyone welcome. Well nearly everyone.
    I too love Gold Lions but in fairness I have never heard any NOS KT88's.
    The TJ's, before they went like fireworks had a much bigger soundstage, and a midrange palpability that had to heard to be believed. The whole room became filled with music like I have never achieved. The Gold Lion does this but the TJ's made them sound almost small. Some might say 'bigger than big' but I loved them.
    Last edited by AlanB; 08-06-2010 at 12:21 AM.
    Go placidly amid the noise and the haste and remember what peace there may be in silence.
    Avoid loud and aggressive persons. They are vexations to the spirit.
    Desiderata


  20. #20
    User211
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    Alan - if you like a huge soundstage, then General Electric 6550s. I thought they were totally insane in my old Air Tight ATM2. Massive soundstage. I've still got 'em. If you are interested in trying them, PM me.

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