Vintage Asylum

RE: Why were vintage luxman so good? Any standouts?

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Iain42

In Reply to: RE: Why were vintage luxman so good? Any standouts? posted by sanman on September 20, 2016 at 07:37:12

I have an MQ60 with the rare 50CA10 triodes. They were a gift from a friend. I use them regularly and enjoy them alot. It is easy to work on.

High sensitivity, wide dynamic range, low distortion, and smooth frequency response. Pwk

http://www.itishifi.com

Follow Ups:

Point-to-point wiring? - FenderLover 07:48:47 09/21/16 (7)
You wouldn't happen to have a photo of the circuitry?

Thanks!
- RE: Point-to-point wiring? - Iain42 19:45:42 09/21/16 (6)
  It ain't pretty because mine is a KMQ60 for kit but I plan on cleaning it up soon. Looks like hell sounds great.
  
  High sensitivity, wide dynamic range, low distortion, and smooth frequency response. Pwk
  
  http://www.itishifi.com
  - RE: Point-to-point wiring? - Eli Duttman 08:52:11 09/22/16 (5)
    Certainly not great, but hardly a "spaghetti bowl".
    
    Maybe replace the signal caps. with a mix of 716P series Orange Drops and Soviet surplus K40 PIOs.
    
    AA sponsor Jim McShane has PTFE insulated hook up wire that could be useful in the refurb.
    
    Eli D.
    - RE: Point-to-point wiring? - Bold Eagle 12:07:54 09/23/16 (3)
      Eli,
      
      I keep seeing folks using PTFE or Teflon insulated wire. What's so wonderful about that vs polyethylene, except for heat resistance? PE has lower dielectric constant.
      
      Thanks,
      
      Jerry
      - RE: Point-to-point wiring? - Eli Duttman 12:42:55 09/23/16 (2)
        
        In Reply to: RE: Point-to-point wiring? posted by Bold Eagle on September 23, 2016 at 12:07:54
        
        Heat resistance is VERY important. I've spent a fair amount of time using nail polish to re-insulate PVC covered wire that had melt back/"burn", after soldering. :> (
        
        PTFE is very good in the heat resistance dept., but it is a major PITA to strip, without nicking the copper. If somebody has a good source for solid core, tin (preferred) or silver plated, 22 AWG "Tefzel" insulated wire I'd very much like to hear about it. "Tefzel" is intermediate between PTFE and "Kynar" among fluorocarbon polymers for heat resistance and ease of use.
        
        Eli D.
        
        RE: Point-to-point wiring? - Bold Eagle 14:43:02 09/23/16 (1)
        
        In Reply to: RE: Point-to-point wiring? posted by Eli Duttman on September 23, 2016 at 12:42:55
        
        Eli,
        
        That's kind of what I thought; but I also see "Teflon" featured in other kinds of wiring like interconnects and even speaker cables. My thought about that was "I wonder if they know PTFE can store charge on it's surface?"
        
        We once had a line of powder coating spray guns that used PTFE as the internal surfaces. From the friction of the powder running against it, the PTFE would accept electrons from the powder, leaving the powder grains with a net positive charge. Once the PTFE stored enough charge and the electric field got strong enough, the electrons would then "hop" from site to site along the PTFE surface until it got close enough to ground to discharge, or even arc over. It didn't seem to me that was a behavior you wanted in audio wiring. The phenomenon does not occur at low field strengths; but some power supply configurations might be high enough. FEP is a lot less susceptible. PTFE has a higher dielectric constant than PE, so you probably would not want it in coaxial cables. There, Foamed PE is probably the best choice for lowest dielectric constant (except for air).
        
        Thanks,
        
        Jerry
        
        Now that was ... - Crazy Dave 17:14:17 09/23/16 (0)
        
        In Reply to: RE: Point-to-point wiring? posted by Bold Eagle on September 23, 2016 at 14:43:02
        
        Very interesting!
        
        Dave
    - Thanks, for picture - FenderLover 09:06:04 09/22/16 (0)
      Looks like they used quality components.

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