Welcome To the Hoffman Amplifiers Forum

September 06, 2025, 05:09:05 pm
guest image
Welcome, Guest. Please login or register.
-User Name
-Password



Hoffman Amps Forum image Author Topic: Transformer heater leads - Continuity  (Read 2571 times)

0 Members and 1 Guest are viewing this topic.

Offline theundeadelvis

  • Level 2
  • **
  • Posts: 338
  • I love tube amps and bacon...
Hoffman Amps Forum image
Transformer heater leads - Continuity
« on: July 20, 2010, 08:31:57 pm »
If I use the continuity tester on the the two heater leads (not the center tap) should I get a beep? I sure hope the answer is yes.  :cry:

Offline theundeadelvis

  • Level 2
  • **
  • Posts: 338
  • I love tube amps and bacon...
Hoffman Amps Forum image
Re: Transformer heater leads - Continuity
« Reply #1 on: July 20, 2010, 08:34:24 pm »
Momentary lapse due to being exhausted. I think it's ok. I tested the leads on the rectifier heaters and they show there is continuity too, so it must be alright. Brain isn't working at 100%. May be bed time.

Offline Dave

  • Level 3
  • ***
  • Posts: 595
Hoffman Amps Forum image
Re: Transformer heater leads - Continuity
« Reply #2 on: July 20, 2010, 08:44:09 pm »
There should be continuity. Not a direct short, but not k-ohms of resistance either.

Dave

Offline PRR

  • Level 5
  • *******
  • Posts: 17082
  • Maine USA
Hoffman Amps Forum image
Re: Transformer heater leads - Continuity
« Reply #3 on: July 21, 2010, 12:17:15 am »
"Continuity" is undefined. Some peepers peep anything under 999 ohms, some not until it gets below 10 ohms.

In any case: a typical heater winding is 0.3 ohms or less. Most meters don't read this low. They either show the ~~1 ohm of their own leads, or they fool you by rounding-down to zero. I have a meter will read sub-ohm but it needs a battery. I have a unique peeper which gives different pitch for anything over 0.02 ohms.

But in general, without exotic tools, a heater winding measures as the next best thing to a dead short.

 


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