Massdrop x Eddie Current ZDT Jr. (Official Thread)

Discussion in 'Headphone Amplifiers and Combo (DAC/Amp) Units' started by Hands, Nov 15, 2017.

  1. RAZRr1275

    RAZRr1275 Facebook Friend

    Contributor
    Joined:
    Nov 11, 2015
    Likes Received:
    116
    Dislikes Received:
    1
    Trophy Points:
    43
    Looks like issues is just a stabilizer that got loose. I'm getting an extra with a my SW51 so hopefully it'll be an easy fix and I can compare :) Big ups to @Zampotech for identifying the problem and sending the part with the SW51. I'm not sure if I can repair it for myself since I don't know how to solder but I'm sure someone I know can.
     
    Last edited: Apr 19, 2020
    hikergrl, tommytakis, dumbo and 4 others like this.
  2. NonpractisingEE

    NonpractisingEE Rando

    Joined:
    Feb 2, 2020
    Likes Received:
    5
    Dislikes Received:
    0
    Trophy Points:
    3
    Location:
    America
    If you have a multimeter (and promise not to electrocute yourself), I'll help you try to get it working.

    This thread has saved mine 2x. Depending on where you are, I could try some basic troubleshooting too. This thing is a tank and it has been fun to break and fix it.
     
    hikergrl, dumbo and Zampotech like this.
  3. dumbo

    dumbo Facebook Friend

    Contributor
    Joined:
    Mar 17, 2018
    Likes Received:
    193
    Dislikes Received:
    2
    Trophy Points:
    43
    Location:
    Port Alberni, BC Canada
    I just had the same issue. Thanks for the info!
     
    Zampotech likes this.
  4. NonpractisingEE

    NonpractisingEE Rando

    Joined:
    Feb 2, 2020
    Likes Received:
    5
    Dislikes Received:
    0
    Trophy Points:
    3
    Location:
    America
    I did the replacement too and the front tubes seem brighter/hotter. Is there a voltage or temperature that I should worry about?
     
  5. Zampotech

    Zampotech Friend

    Friend
    Joined:
    Oct 15, 2018
    Likes Received:
    2,907
    Dislikes Received:
    1
    Trophy Points:
    93
    Location:
    Moskou
    Home Page:
    You need to remove one tube and measure the heater voltage. If measured from above, it will be 4 and 5 pin (count clockwise)
    The constant voltage should be 6.0..6.4 volts.
     
    hikergrl and dumbo like this.
  6. RAZRr1275

    RAZRr1275 Facebook Friend

    Contributor
    Joined:
    Nov 11, 2015
    Likes Received:
    116
    Dislikes Received:
    1
    Trophy Points:
    43
    Hey! Sorry it took so long to get back I don't log into my account here super often. I'm located in NYC
     
  7. farbinator

    farbinator Acquaintance

    Contributor
    Joined:
    Jul 3, 2020
    Likes Received:
    83
    Dislikes Received:
    0
    Trophy Points:
    18
    Location:
    United States
    Wanted to share a modification I recently added to my ZDT Jr. Unfortunately when I first got mine, I discovered that the volume potentiometer was faulty, cutting out at various portions of the sweep range on the left channel. It was usable to a degree so I let it be for awhile, but vowed to do something about it.

    Recently I replaced the stock one for an ALPS RK27, link at the bottom for ~$20. The version I bought came soldered to a screw terminal PCB so all that I needed to do was snip the leads on the old pot off, remove and replace. I did have to drill another hole for the retaining nub on this pot, but that was easy.

    [​IMG]

    I've been enjoying my ZDT Jr. for a few months now, picked up brand new along with the widely recommended GE JAN 5654W tubes for the drivers, and Procomm ECC89s for the power tubes. This is a great tube amp, especially given the price I got it for.

    * https://www.amazon.com/ALPS-Round-shaft-amplifer-potentiometer/dp/B07J9KYQV2/
     
    Last edited: Jul 3, 2020
  8. gixxerwimp

    gixxerwimp Professional tricycle rider

    Friend
    Joined:
    Sep 30, 2015
    Likes Received:
    3,639
    Dislikes Received:
    15
    Trophy Points:
    113
    Location:
    small island claimed by China
    @Zampotech I saw you received some PCBs for your new amp. Any chance the boards for the "hard rock adapter" also arrived?
     
  9. Zampotech

    Zampotech Friend

    Friend
    Joined:
    Oct 15, 2018
    Likes Received:
    2,907
    Dislikes Received:
    1
    Trophy Points:
    93
    Location:
    Moskou
    Home Page:
    Yes, I got the circuit boards. But the logistics of delivering these boards were not quite traditional. The adapter boards are still in storage somewhere.
    The situation is that the factory has already sent it, but I haven't received it yet.

    I will probably re-order a new set of boards and send them via a different route.
     
    microCuts and gixxerwimp like this.

Share This Page