Welcome To the Hoffman Amplifiers Forum

September 07, 2025, 06:09:35 am
guest image
Welcome, Guest. Please login or register.
-User Name
-Password



« previous next »
Pages: [1]   Go Down

Hoffman Amps Forum image Author Topic: Hammond transformer primaries  (Read 2014 times)

0 Members and 1 Guest are viewing this topic.

Offline acheld

  • Level 3
  • ***
  • Posts: 1264
  • No well conceived plan survives the event.
Hoffman Amps Forum image
Hammond transformer primaries
« on: July 26, 2021, 03:19:00 pm »
I am curious about the purpose of the "Orange" wire which is present on the primary side of a Hammond 290DX.   What is it for?   I have no plans to use it, but Hammond does not put arbitrary wires in their products . . .
Hoffman Amps Forum image Logged

Offline Joel

  • Level 2
  • **
  • Posts: 187
  • I love Tube amps
Hoffman Amps Forum image
Re: Hammond transformer primaries
« Reply #1 on: July 26, 2021, 04:01:55 pm »
EMI shield.  Its connected to a copper band that surrounds the coils.
Hoffman Amps Forum image Logged
The mouth of a happy man is filled with beer  - Egyptian Proverb

Offline acheld

  • Level 3
  • ***
  • Posts: 1264
  • No well conceived plan survives the event.
Hoffman Amps Forum image
Re: Hammond transformer primaries
« Reply #2 on: July 26, 2021, 05:06:43 pm »
Quote from: Joel on July 26, 2021, 04:01:55 pm
EMI shield.  Its connected to a copper band that surrounds the coils.

Should I ground the orange wire to the chassis?   I figured the transformer was grounded via the mounting bolts.
Hoffman Amps Forum image Logged

Offline sluckey

  • Level 5
  • *******
  • Posts: 5075
    • Sluckey Amps
Hoffman Amps Forum image
Re: Hammond transformer primaries
« Reply #3 on: July 26, 2021, 07:02:47 pm »
Quote from: acheld on July 26, 2021, 05:06:43 pm
Should I ground the orange wire to the chassis?
yes
Hoffman Amps Forum image Logged
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!
Pages: [1]   Go Up
« previous next »
 


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