Welcome To the Hoffman Amplifiers Forum

September 07, 2025, 05:26:22 am
guest image
Welcome, Guest. Please login or register.
-User Name
-Password



Hoffman Amps Forum image Author Topic: Doug -- wiring diagram of old transformer?  (Read 2205 times)

0 Members and 1 Guest are viewing this topic.

Offline Mook

  • Level 1
  • *
  • Posts: 41
  • I love Tube amps
Hoffman Amps Forum image
Doug -- wiring diagram of old transformer?
« on: April 27, 2015, 02:05:53 pm »
So, I bought this Power Tranny from you about 10 years ago.    I believe it's for a tweed deluxe.

I don't know the wiring layout.    Can you help?


It has:

Green, G/Y, and Green -- These are for the 6.3V filaments.

Red, R/Y, and Red -- Secondary Power, with center tap.

Black, Black/Red, and Black/White ---  I know they are primary, but I dunno what the voltages are......120v?  240v?       Do you know?

Last, it has:    Yellow, Yellow/White, and White --  I know somewhere these are 5V for filaments for tube recto, but what layout?


Here are pics:


Offline sluckey

  • Level 5
  • *******
  • Posts: 5075
    • Sluckey Amps
Hoffman Amps Forum image
Re: Doug -- wiring diagram of old transformer?
« Reply #1 on: April 27, 2015, 05:14:53 pm »
That's the Marshall 18W PT. The diagram is on this page...

     http://el34world.com/Transformers/marshall.htm
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline Mook

  • Level 1
  • *
  • Posts: 41
  • I love Tube amps
Hoffman Amps Forum image
Re: Doug -- wiring diagram of old transformer?
« Reply #2 on: April 27, 2015, 08:01:03 pm »
That's the Marshall 18W PT. The diagram is on this page...

     http://el34world.com/Transformers/marshall.htm


OH!    Thank you SO MUCH!!!!     <3


Mook

Offline EL34

  • Administrator
  • Level 5
  • **********
  • Posts: 10407
  • wooot!
    • Hoffman Amplifiers
Hoffman Amps Forum image
Re: Doug -- wiring diagram of old transformer?
« Reply #3 on: May 09, 2015, 01:26:15 pm »
Sorry, I did not see this post


Why was it posted in schematics?

 


Choose a link from the
Hoffman Amplifiers parts catalog
Mobile Device
Catalog Link
Yard Sale
Discontinued
Misc. Hardware
What's New Board Building
 Parts
Amp trim
Handles
Lamps
Diodes
Hoffman Turret
 Boards
Channel
Switching
Resistors Fender Eyelet
 Boards
Screws/Nuts
Washers
Jacks/Plugs
Connectors
Misc Eyelet
Boards
Tools
Capacitors Custom Boards
Tubes
Valves
Pots
Knobs
Fuses/Cords Chassis
Tube
Sockets
Switches Wire
Cable


Handy Links
Tube Amp Library
Tube Amp
Schematics library
Design a custom Eyelet or
Turret Board
DIY Layout Creator
File analyzer program
DIY Layout Creator
File library
Transformer Wiring
Diagrams
Hoffmanamps
Facebook page
Hoffman Amplifiers
Discount Program


password