Welcome To the Hoffman Amplifiers Forum

September 07, 2025, 11:37:06 am
guest image
Welcome, Guest. Please login or register.
-User Name
-Password



Hoffman Amps Forum image Author Topic: Help with Supro 1960T  (Read 2489 times)

0 Members and 1 Guest are viewing this topic.

Offline Travis8

  • Level 2
  • **
  • Posts: 191
  • I love Tube amps
Hoffman Amps Forum image
Help with Supro 1960T
« on: July 12, 2022, 09:30:55 am »
Hi!

I wanna know how can I check where is the problem on my Supro 1960T.

Thanks

video: https://drive.google.com/file/d/1QtJjcMc1Fi2pkPdsuHvOWil7fMhNr6MX/view?usp=sharing

Offline Lectroid

  • Level 3
  • ***
  • Posts: 632
  • Progress is made by lazy people
Hoffman Amps Forum image
Re: Help with Supro 1960T
« Reply #1 on: July 12, 2022, 03:27:50 pm »
That djinn you've imprisoned in that little glass bottle?  He's pissed!
Subvert the Dominant Paradigm!
Free Beer Tomorrow!

Offline shooter

  • Level 5
  • *******
  • Posts: 11015
  • Karma Loves haters
Hoffman Amps Forum image
Re: Help with Supro 1960T
« Reply #2 on: July 12, 2022, 05:50:48 pm »
maybe start here
Trouble shooting an amp problem guidelines (el34world.com)


maybe post what you've tried so far, DCv's, scope shots...
Went Class C for efficiency

Offline Travis8

  • Level 2
  • **
  • Posts: 191
  • I love Tube amps
Hoffman Amps Forum image
Re: Help with Supro 1960T
« Reply #3 on: July 13, 2022, 05:38:55 pm »
Nice!!.

Some recommwndation looking at the video?

Offline sluckey

  • Level 5
  • *******
  • Posts: 5075
    • Sluckey Amps
Hoffman Amps Forum image
Re: Help with Supro 1960T
« Reply #4 on: July 13, 2022, 05:52:59 pm »
Swap the output tubes around. Does the light show stay with the tube?
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline Travis8

  • Level 2
  • **
  • Posts: 191
  • I love Tube amps
Hoffman Amps Forum image
Re: Help with Supro 1960T
« Reply #5 on: July 15, 2022, 04:11:32 am »
Swap the output tubes around. Does the light show stay with the tube?

This blue light stay all the time, I just turn on and off the amp to show the problem

Offline sluckey

  • Level 5
  • *******
  • Posts: 5075
    • Sluckey Amps
Hoffman Amps Forum image
Re: Help with Supro 1960T
« Reply #6 on: July 15, 2022, 07:16:22 am »
Of course it does. But does the blue light only occur inside that one tube, regardless of which socket it is plugged into?
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline tubeswell

  • Level 4
  • *****
  • Posts: 4202
  • He who dies with the most tubes... wins
Hoffman Amps Forum image
Re: Help with Supro 1960T
« Reply #7 on: July 15, 2022, 11:59:05 am »
Try what sluckey is suggesting- swap the output tubes around and see if the problem stays with the tube or stays with the socket.


(PS switch the amp off before swapping the tubes around)
« Last Edit: July 15, 2022, 12:01:18 pm by tubeswell »
A bus stops at a bus station. A train stops at a train station. On my desk, I have a work station.

Offline Travis8

  • Level 2
  • **
  • Posts: 191
  • I love Tube amps
Hoffman Amps Forum image
Re: Help with Supro 1960T
« Reply #8 on: July 27, 2022, 05:59:51 am »
Try what sluckey is suggesting- swap the output tubes around and see if the problem stays with the tube or stays with the socket.


(PS switch the amp off before swapping the tubes around)

I try it and the proble persist in the valve, but now is in the other socket..

So maybe the problem is the tubes ...

The same issue happens in the other tube but less pronounce

Offline sluckey

  • Level 5
  • *******
  • Posts: 5075
    • Sluckey Amps
Hoffman Amps Forum image
Re: Help with Supro 1960T
« Reply #9 on: July 27, 2022, 06:50:37 am »
I agree
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

 


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