Results 1 to 10 of 10

Thread: Fender PA-135 Head - Waht to do with it? Mod? Repair?

  1. #1
    Member
    Join Date
    Aug 2015
    Location
    Ecuador
    Posts
    58
    Thumbs Up/Down
    Received: 13/0
    Given: 41/0
    Rep Power
    5

    Fender PA-135 Head - Waht to do with it? Mod? Repair?

    Hello friends, this time I came across with a Fender PA-135 which sounds like it was a 1 watt amp instead of a 135 watts. Really low output.

    I don't know if its worth to fix this amp, I have read it sounds flat and dull for a guitar amp (I know it's a PA)
    The other option would be to modify it, but I don't know how difficult it could be considering that I live in Ecuador, and there are almost no parts, I will have to order them from USA.

    Is there any company that sells popullated PCBs or convertions for this amp?
    Is it worth it to do anything with it? or have it just for parts?

    0 Not allowed! Not allowed!

  2. #2
    Supporting Member
    Join Date
    Mar 2018
    Location
    Germany
    Posts
    2,555
    Thumbs Up/Down
    Received: 1,906/1
    Given: 1,104/2
    Rep Power
    5
    Quote Originally Posted by spunko View Post
    Hello friends, this time I came across with a Fender PA-135 which sounds like it was a 1 watt amp instead of a 135 watts. Really low output.

    I don't know if its worth to fix this amp, I have read it sounds flat and dull for a guitar amp (I know it's a PA)
    The other option would be to modify it, but I don't know how difficult it could be considering that I live in Ecuador, and there are almost no parts, I will have to order them from USA.

    Is there any company that sells popullated PCBs or convertions for this amp?
    Is it worth it to do anything with it? or have it just for parts?
    First thing I'd do is check if PT and OT are ok, as these are the most expensive/valuable parts.
    Amp could easily be converted to a Dual Showman Reverb or Bassman 135.

    https://www.thetubestore.com/lib/the...-Schematic.pdf

    0 Not allowed! Not allowed!
    - Own Opinions Only -

  3. #3
    Supporting Member
    Join Date
    Aug 2017
    Location
    Portland, OR
    Posts
    765
    Thumbs Up/Down
    Received: 274/1
    Given: 111/2
    Rep Power
    3
    Looks like the OT on this amp is an ultralinear type, correct? I wonder how well these do for lower powered amps.

    There is a company called KLD that sells PCBs and turret board kits for tube amps on ebay. Maybe something like a Bassman or JTM45?

    As far as you amp having very low output, might want to check the speaker jacks. It sounds a lot like this one. https://music-electronics-forum.com/...ad.php?t=37065

    1 Not allowed! Not allowed!
    Last edited by glebert; 12-07-2019 at 06:01 PM.

  4. #4
    Member
    Join Date
    Aug 2015
    Location
    Ecuador
    Posts
    58
    Thumbs Up/Down
    Received: 13/0
    Given: 41/0
    Rep Power
    5
    Quote Originally Posted by Helmholtz View Post
    First thing I'd do is check if PT and OT are ok, as these are the most expensive/valuable parts.
    Amp could easily be converted to a Dual Showman Reverb or Bassman 135.

    https://www.thetubestore.com/lib/the...-Schematic.pdf
    I'm pretty sure transformers are ok. I got it from a friend, it was working fine, one day it just dropped output. It is in pristine condition and haven't been used for years. Really low usage.
    I tested the tubes in another amp and they work great, and also I put new tubes in the PA but with the same result.

    Quote Originally Posted by glebert View Post
    Looks like the OT on this amp is an ultralinear type, correct? What are the plate and screen voltages for this? Wonder if it will be hard to make anything lower powered.

    As far as you amp having very low output, might want to check the speaker jacks. It sounds a lot like this one. https://music-electronics-forum.com/...ad.php?t=37065
    Yes, it is an ultralinear. I will try the speaker jacks firts, thank you very much for the link.

    Maybe is there any company that sells PCBs, or turrets boards with components.

    0 Not allowed! Not allowed!

  5. #5
    Supporting Member
    Join Date
    Aug 2017
    Location
    Portland, OR
    Posts
    765
    Thumbs Up/Down
    Received: 274/1
    Given: 111/2
    Rep Power
    3
    Quote Originally Posted by spunko View Post
    Maybe is there any company that sells PCBs, or turrets boards with components.
    The KLD boards have components. https://www.ebay.com/itm/Turret-boar...wAAOSwqVdapyqp You would have to navigate the differences between circuits, such as tube rectifier vs the solid state rectifier your amp has.

    1 Not allowed! Not allowed!

  6. #6
    Supporting Member
    Join Date
    Mar 2018
    Location
    Germany
    Posts
    2,555
    Thumbs Up/Down
    Received: 1,906/1
    Given: 1,104/2
    Rep Power
    5
    I got it from a friend, it was working fine, one day it just dropped output.
    Such behaviour is common to many component (including transformer) and contact failures and doesn't prove anything.
    I am not saying that it is likely that a transformer is defective but if so, it might impact the decision if a conversion or repair is worth the trouble and cost.

    1 Not allowed! Not allowed!
    - Own Opinions Only -

  7. #7
    Don't forget the joker g1's Avatar
    Join Date
    Feb 2010
    Location
    Canada, somewhere north of Fargo
    Posts
    12,030
    Thumbs Up/Down
    Received: 1,795/24
    Given: 4,615/11
    Rep Power
    23
    I'd get it running (if transformers ok) and use it with pedals if you find it sounds too flat.
    Start with checking power supply and tube DC voltages.

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

  8. #8
    Old Timer olddawg's Avatar
    Join Date
    Dec 2007
    Location
    La Jolla CA, Hanalei, Kauai
    Posts
    3,021
    Thumbs Up/Down
    Received: 319/0
    Given: 34/1
    Rep Power
    16
    I second getting it operating properly before you do anything. It should be VERY loud and clean. The next decision is to decide the application. These are basically multi channel Showmans. Probably fine for a pedal platform but donít expect it to break up. Once you know the iron is good you can gut it and make whatever you want.

    1 Not allowed! Not allowed!

  9. #9
    Old Timer
    Join Date
    May 2006
    Location
    Chill-Ville, VA
    Posts
    3,274
    Thumbs Up/Down
    Received: 735/6
    Given: 1,472/10
    Rep Power
    18
    I'd use it as a PA. Seriously. Laugh if you like.

    Justin

    1 Not allowed! Not allowed!
    "Wow it's red! That doesn't look like the standard Marshall red. It's more like hooker lipstick/clown nose/poodle pecker red." - Chuck H. -
    "Of course that means playing **LOUD** , best but useless solution to modern sissy snowflake players." - J.M. Fahey -
    "All I ever managed to do with that amp was... kill small rodents within a 50 yard radius of my practice building." - Tone Meister -

  10. #10
    Supporting Member mozz's Avatar
    Join Date
    Oct 2015
    Location
    NEPA
    Posts
    839
    Thumbs Up/Down
    Received: 196/1
    Given: 136/0
    Rep Power
    5
    Friend had one of these, bassman drip edge model 135. Ultralinear output trans. I may have swapped out the output trans but i had mentioned JTM45 KT66's, and he said go for it. Voltages were really high so i added a 500 ohm sag resistor, he loved the sound of it when finished.

    0 Not allowed! Not allowed!

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Anyone familiar with repair of Moving Head LED lights
    By guitardad in forum Music Electronics
    Replies: 4
    Last Post: 04-01-2014, 08:22 AM
  2. Replies: 3
    Last Post: 03-12-2013, 12:59 AM
  3. B-52 AT-100 Guitar head repair question
    By drummer31337 in forum Guitar Amps
    Replies: 5
    Last Post: 08-05-2010, 06:19 PM
  4. Marmac XL120 Head Repair
    By Sanitarium in forum Maintenance, Troubleshooting & Repair
    Replies: 5
    Last Post: 08-18-2009, 12:07 PM
  5. B-52 At100 Head Repair HELP PLease!!!!!!!
    By GStratton566 in forum Maintenance, Troubleshooting & Repair
    Replies: 4
    Last Post: 04-23-2008, 06:02 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
  •