Results 1 to 7 of 7

Thread: Help with transistor sub

  1. #1
    Senior Member
    Join Date
    Nov 2007
    Location
    Murfreesboro,Tn outside Nashville
    Posts
    109

    Help with transistor sub

    I have a Mashall VS100 with bad outputs. Can I use these as subs?

    BDV65 OEM
    can I use a 2N3055 or 2SD718
    the normal sub is TIP142

    BDV64 OEM
    can I use a MJ2955 or 2SB688
    the normal sub is TIP147

    using transistors I have if I can don't have the TIP's

  2. #2
    Senior Member Enzo's Avatar
    Join Date
    May 2006
    Location
    Lansing, Michigan, USA
    Posts
    21,544
    Basically no.

    First, the originals and those TIPs are Darlington transistors - internally they are dual transistors with a LOT more gain than plain old transistors. Like a gain of 1000 instead of a gain of 50.

    Second, the 2N3055 is not remotely shaped like the BDV part. The "package" is wrong. How would you mount it?
    Education is what you're left with after you have forgotten what you have learned.

  3. #3
    Senior Member
    Join Date
    Nov 2007
    Location
    Murfreesboro,Tn outside Nashville
    Posts
    109

    Thanks for the reply

    I didn't use my head on this one. I just had a box of new transistors and heatsinks for audio amps. I just didn't have the correct subs.
    I have the preamp working. The amp has been roughed up alot. It was threw out in the driveway at a Nashville studio. So it is just a project amp
    I will order the correct subs for the power amp.
    Thanks again for the info.
    Jess

  4. #4
    Old Timer Gtr_tech's Avatar
    Join Date
    Nov 2007
    Location
    Owosso, Mi
    Posts
    1,616
    Every valvestate I've ever heard I wanted to throw out in the driveway......
    The farmer takes a wife, the barber takes a pole....

  5. #5
    Senior Member
    Join Date
    Nov 2007
    Location
    Murfreesboro,Tn outside Nashville
    Posts
    109

    I am sure you are right

    this one is a mess. I just pickup them up to mess with so I don't expect much out of this thing.

  6. #6
    Senior Member Enzo's Avatar
    Join Date
    May 2006
    Location
    Lansing, Michigan, USA
    Posts
    21,544
    They make a lovely planter.
    Education is what you're left with after you have forgotten what you have learned.

  7. #7
    Senior Member
    Join Date
    Nov 2007
    Location
    Murfreesboro,Tn outside Nashville
    Posts
    109

    not this one not much left

    the cab is broken, and the panel with marshall logo on it is gone. I have it working as a preamp, just a few parts and it will have life again. I have a few more old amps to play with til parts come in.
    I just finished a Standell Studio 60 and a Custom head, Thanks for all your replys on this site. I am kind of slow to pick up stuff, but I have got alot out of you posts on all of these subjects.
    Jess

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Cathode Transistor?
    By lowell in forum Theory & Design
    Replies: 11
    Last Post: 05-16-2011, 07:20 AM
  2. Ampeg transistor?
    By drewl in forum Maintenance, Troubleshooting & Repair
    Replies: 15
    Last Post: 04-20-2011, 03:15 PM
  3. Help identifying transistor
    By uvacom in forum Guitar Amps
    Replies: 4
    Last Post: 03-31-2010, 07:58 AM
  4. transistor madness
    By nopainkiller in forum Music Electronics
    Replies: 25
    Last Post: 11-18-2008, 08:09 PM
  5. transistor matching question
    By dusty tolex in forum Maintenance, Troubleshooting & Repair
    Replies: 4
    Last Post: 05-27-2008, 10:10 PM

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
  •