Results 1 to 7 of 7

Thread: Custom harp amp build completed

  1. #1
    Member
    Join Date
    Jun 2014
    Posts
    23

    Custom harp amp build completed

    Hi everyone.

    I just finished a build of a custom harp amp. It's based on the Fender 5c4/5d4 schematics with some tweaks here and there to modernize the circuit and make it as simple as it could be in terms of "just-plug-in-and-blow-ability." All in all, I think this thing turned out really "super" if you catch my drift

    Rather than post all the gory details here and repost the same info on four different forums, I created a blog entry complete with a demo song featuring the amp and background info on why I built it in the first place.

    MakerDP: "Sonhouse Super Harp" Amplifier Build


    I'm not really a regular here and I hang-out mostly on AX84. However, since I got a bit of information for this build from this board I thought I should share this with you all. There is very limited information out there on harp amp building. Some of the info floating around the web is just downright not altogether correct so it's hard to sift through it all. MEF seems to be the best repository of original knowledge and pointers to other good sources available on the web, so here is my contribution.

    So, thanks everyone for looking and/or contributing to this forum!
    Visit my blog showing some of the amp and other electronics projects I've done...

    http://www.1darren1.com

  2. #2
    Old Timer tedmich's Avatar
    Join Date
    Apr 2008
    Location
    Sonoma CA
    Posts
    3,086
    Nice red tolex work! I like the odd angles (like many of the harp players I've known )


  3. #3
    Member
    Join Date
    Feb 2007
    Location
    Bålsta
    Posts
    57
    Great job.
    It's just one channel!.
    Is the first tube parallell connected?

  4. #4
    Member
    Join Date
    Jun 2014
    Posts
    23
    Quote Originally Posted by arnenym View Post
    Great job.
    It's just one channel!.
    Is the first tube parallell connected?
    Sorry for the late response...

    yes the first tube is a 12AY7 wired in parallel.

    Yes one channel with tone & volume. Tis all you need for a harp amp!

    After using this live many times since it was built, this amp sounds great. Of course, the player has a lot to do with it but it was just what the doctor ordered. It sounds really fantastic and he can now keep up with the band without feeling like he's blowing his lungs out of his chest.
    Visit my blog showing some of the amp and other electronics projects I've done...

    http://www.1darren1.com

  5. #5
    Member
    Join Date
    Feb 2007
    Location
    Bålsta
    Posts
    57
    How do your super clean preamp work for harp?

  6. #6
    Member
    Join Date
    Jun 2014
    Posts
    23
    Most of the overdrive is in the power amp due to its cathode bias and no negative feedback loop. This provides a nice early breakup in the power section to help minimize feedback.

    The key to the preamp is the 12AY7 with a fairly low voltage on the plates provides a nice early breakup. Also helps with reducing feedback since it can be achieved at lower volumes.
    Visit my blog showing some of the amp and other electronics projects I've done...

    http://www.1darren1.com

  7. #7
    Member
    Join Date
    Feb 2007
    Location
    Bålsta
    Posts
    57
    Thank you

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Want to build a small harp amp
    By blindboybenton in forum Harp Amps
    Replies: 5
    Last Post: 04-15-2015, 03:36 PM
  2. New Member with completed first build - Weber 5E7M
    By Modern Saint in forum Tweed Builders
    Replies: 6
    Last Post: 10-01-2012, 06:15 PM
  3. Replies: 5
    Last Post: 01-21-2011, 06:11 PM
  4. 2 Stroke Build completed today, Question
    By rsmalling in forum Debugging Your Build
    Replies: 1
    Last Post: 05-27-2010, 06:25 AM
  5. first build completed -thanks to all!
    By pbreyfogle in forum 5 E 3
    Replies: 4
    Last Post: 06-30-2007, 06:09 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
  •