Results 1 to 6 of 6

Thread: Hum in power amp chassis of Black Japanese built Ampeg SVT

  1. #1
    Member
    Join Date
    Jun 2006
    Location
    Sydney Australia
    Posts
    32
    Thumbs Up/Down
    Received: 1/0
    Given: 0/0
    Rep Power
    0

    Hum in power amp chassis of Black Japanese built Ampeg SVT

    Hi

    I have been battling away trying to rid my brother's SVT of a noticeable hum. The hum is purely in the power amp chassis. The hum appears to be coming from the anode of the 12DW7 valve.

    The link below discusses the suggestions and things I've tried along with photo's.

    Thanks for your time and patience.

    Regards

    Mark

    http://https://ampgarage.com/forum/viewtopic.php?f=6&t=31414&hilit=Ampeg

    0 Not allowed! Not allowed!

  2. #2
    Don't forget the joker g1's Avatar
    Join Date
    Feb 2010
    Location
    Canada, somewhere north of Fargo
    Posts
    11,595
    Thumbs Up/Down
    Received: 1,503/23
    Given: 3,807/11
    Rep Power
    22
    Can you post the appropriate schematic here?

    0 Not allowed! Not allowed!
    Just because they don't have tubes doesn't mean they don't have feelings! - glebert

  3. #3
    Member
    Join Date
    Jun 2006
    Location
    Sydney Australia
    Posts
    32
    Thumbs Up/Down
    Received: 1/0
    Given: 0/0
    Rep Power
    0
    https://www.thetubestore.com/lib/the...-Schematic.pdf

    This is the circuit that I'm using. Check out the Amp Garage link there is a lot of info there including what the earth path really looks like.

    Regards

    Mark

    0 Not allowed! Not allowed!
    Last edited by mark; 02-09-2019 at 07:25 AM.

  4. #4
    Don't forget the joker g1's Avatar
    Join Date
    Feb 2010
    Location
    Canada, somewhere north of Fargo
    Posts
    11,595
    Thumbs Up/Down
    Received: 1,503/23
    Given: 3,807/11
    Rep Power
    22
    For starters, that is not an 'official' Ampeg schematic, and those Piazza drawings sometimes contain errors.
    Second, that is not the version of the amp referred to in that amp garage thread (loop jacks are directly grounded).
    So find out which exact version of the amp you have, and find the proper and official ampeg schematic for it.
    Post it here. (the attachments in the amp garage thread are not available to non-members, but maybe the correct schematic is shown in that thread?)

    0 Not allowed! Not allowed!
    Just because they don't have tubes doesn't mean they don't have feelings! - glebert

  5. #5
    Member
    Join Date
    Jun 2006
    Location
    Sydney Australia
    Posts
    32
    Thumbs Up/Down
    Received: 1/0
    Given: 0/0
    Rep Power
    0
    The info is in the Amp Garage link, actual Ampeg circuit is there too in the first post. The circuit diagram doesn't show the layout of the power supply which is in the first post on Amp Garage. The link below takes you to the circuit diagram.

    https://ampgarage.com/forum/download/file.php?id=51797

    Regards

    Mark

    0 Not allowed! Not allowed!

  6. #6
    Don't forget the joker g1's Avatar
    Join Date
    Feb 2010
    Location
    Canada, somewhere north of Fargo
    Posts
    11,595
    Thumbs Up/Down
    Received: 1,503/23
    Given: 3,807/11
    Rep Power
    22
    Those links require membership at amp garage.

    0 Not allowed! Not allowed!
    Just because they don't have tubes doesn't mean they don't have feelings! - glebert

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Home built power amp
    By Joe bags in forum Music Electronics
    Replies: 4
    Last Post: 01-21-2016, 02:37 PM
  2. Newly built clone ampeg B15 with 100watt output
    By blindboybenton in forum Maintenance, Troubleshooting & Repair
    Replies: 13
    Last Post: 03-26-2015, 01:51 PM
  3. Bucking Transformer Built In to Chassis
    By chinrest in forum Mods & Tweaks
    Replies: 11
    Last Post: 11-18-2013, 02:57 AM
  4. I need an ampeg V-3 V-7 japanese design pre-amp schematic
    By robbee_rmf in forum Schematic Requests
    Replies: 0
    Last Post: 02-19-2010, 06:35 AM
  5. +++Need schematic for Ampeg V3 Japanese version+++
    By tortoto in forum Vintage Amps
    Replies: 1
    Last Post: 03-24-2008, 08:56 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •