OTL Asylum

RE: R&R tubes in Transcendent T8-LN

68.104.110.35

LtMandella

A

In Reply to: RE: R&R tubes in Transcendent T8-LN posted by LtMandella on November 30, 2019 at 17:34:59

Thanks guys

I will at least deoxit and pipe cleaner the sockets.

And I will try and get a look at the sockets and solder joint - depending on how much disassembly of the chassis may be required.

There are a couple techs in Vegas where I live that work with tube amps.
But I expect it would end up being 5 hours at $100 per hour to R&R the tubes, replace the anode caps, and rebias. Which if I was working I would gladly pay - the amp is worth it that's for sure. But I am not working so it's all on me.

There must be something wrong with me for not having something wrong.

Follow Ups:

RE: R&R tubes in Transcendent T8-LN - rogerh113 06:09:22 12/04/19 (5)
Do you have any soldering skills? Replacing the ceramic caps is pretty easy stuff.

I think these amps were also sold as kits, so instructions should be around. The only important thing is to make sure the electrolytic caps are fully discharged before you go in there - not a hard thing but important.
- RE: R&R tubes in Transcendent T8-LN - LtMandella 06:40:34 12/04/19 (4)
  yes I should have no problem with the soldering (famous last words :).
  
  And actually I bought the amp new, "Factory" assembled directly from Transcendent Sound.
  
  I did post on the Transcendent forum but haven't heard anything from there. I expect that group really expects a 20 year old amp to need some maintenance and the owner to be able to do it...
  
  There must be something wrong with me for not having something wrong.
  - RE: R&R tubes in Transcendent T8-LN - LtMandella 07:35:09 01/01/20 (3)
    All fixed! Amp sounds great again.
    
    I replaced the anode caps with ceramic versions.
    
    Replaced 8 EL-509 power tubes with tubes from my "NOS" cache.
    
    Then I decided to take a look on the component side of the board and found 4 leaky 1 mfd 630v caps, so replaced those.
    
    After all above replacements, still not much improvement. Sound was thin and distorted in the lower frequencies.
    
    As a last resort, I decided to check the fuses. The T8-LN has a 1.5 amp fuse for each channel, and a 6 amp power fuse.
    
    Since I always had sound from both channels I never thought to check for an open fuse.
    
    But one of the channel fuses was open. After replacing that fuse, all is good!
    
    There must be something wrong with me for not having something wrong.
    - There's obviously nothing wrong with you,... - Lew 13:03:22 01/20/20 (2)
      because you DID have something wrong.
      
      Any idea why a blown fuse didn't cause profound problems, apparently since you only found it by checking fuses?
      - RE: There's obviously nothing wrong with you,... - LtMandella 14:51:15 01/20/20 (0)
        
        In Reply to: RE: There's obviously nothing wrong with you,... posted by Lew on January 20, 2020 at 13:03:22
        
        also it might be worth noting: visually there was little indication the fuse was blown - it is one of 3 for the amp. No glass discoloration or burn mark. But continuity test showed it was open.
        
        There must be something wrong with me for not having something wrong.
      - RE: There's obviously nothing wrong with you,... - LtMandella 14:25:53 01/20/20 (0)
        
        In Reply to: RE: There's obviously nothing wrong with you,... posted by Lew on January 20, 2020 at 13:03:22
        
        Well kind of depends on your definition of "profound".
        
        There was basically no bass, and even the mids were distorted.
        
        I don't understand electronic theory well enough to know the function of the circuit that was fused. I would have expected one channel to be completely dead.
        
        But it was not.
        
        The amp is a factory built T8-LN from Transcendent Sound. I have the schematic...
        
        There must be something wrong with me for not having something wrong.

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