Alex 54

Wammer
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About Alex 54

  • Rank
    Junior Wammer

Personal Info

  • Location
    UK

Wigwam Info

  • Turn Table
    Townshend Elite Rock
  • Tone Arm & Cartridge
    Excalibur/Decca
  • SUT / Phono Stage
    Rega Fono MM MkII
  • Digital Source 1
    Linn KDSM Mk3
  • Digital Source 2
    Oppo UDP-205MR
  • DAC
    Linn KDSM Mk3
  • Pre-Amp
    Linn KDSM Mk3
  • Power Amp/s
    Nord One Up NC500 II
  • My Speakers
    Glastonbury Tor Mk1
  • Headphones
    Oppo PM-1
  • Trade Status
    I am not in the Hi-Fi trade

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  1. I've been doing this for years, sounds great. If it's just stereo, make sure you set up the TV to output stereo or it will sound weird. Best to use a Toslink cable to link in the TV as this gives you all the advantages of optical isolation from a noisy piece of AV kit.
  2. It's a plug-in fuse so if there are no sockets in the board to take it maybe it came from somewhere else on the PCB?
  3. Thank you for being a great host!
  4. They'll just say it wasn't packed properly, the original packaging is really the only way to be safe!
  5. Alex 54

    Heatsink Help!

    As a class A design it will be dumping a lot of energy into the heatsink, you need to find out exactly how much. I don't think 3 degrees/W will cut it, at 50W they would reach a temperature of 150C. If space is at a premium, you could go for a heatsink with integral fan cooling but you would need to have a thermal cutout in case of fan failure. It's also advisable to mount all the output transistors for each channel on the same heatsink so they are thermally coupled to compensate for drift problems.
  6. It was low frequency overload of the output transformers, all later models were fitted with a beefier transformer.
  7. The lower voltage rating of the polystyrene capacitor is no problem, silvered mica capacitors generally have high voltage ratings.
  8. OK, so it is an inter-winding screen then.
  9. You were measuring the secondary, what I was referring to was what looks to be a centre tap on the primary in your circuit?
  10. Rather than an tap it's probably an inter-winding screen, a quick check with a meter will tell you if it's actually connected to the winding.
  11. Using two transformers give you separate power supplies for each channel which is a good idea. Don't think you have the mains input side of the transformers correct. Is there really a grounded centre tap on the primary? The triac is probably a soft start for the transformer but something is missing?
  12. Since the circuit will have been designed to use those devices I would stick with them, Lambda have been used by a number of manufacturers including Pass Labs. Though obsolete, they can still be sourced if need be.