Welcome To the Hoffman Amplifiers Forum

September 08, 2025, 08:58:53 am
guest image
Welcome, Guest. Please login or register.
-User Name
-Password



Hoffman Amps Forum image Author Topic: Transformer Upgrade for Blues Jr.  (Read 3538 times)

0 Members and 1 Guest are viewing this topic.

Offline Tbone55

  • Level 2
  • **
  • Posts: 367
  • I love Tube amps
Hoffman Amps Forum image
Transformer Upgrade for Blues Jr.
« on: August 29, 2019, 08:05:03 am »
Hey All,

I have a Blues Jr that I re-did using Doug's parts kit and was thinking of replacing the transformers. I'm still using the EL84's and don't plan on converting to 6V6/EL34 as I already have several other amps with those power tubes. Is there anything to be gained replacing the stock transformers and if so, which ones would you recommend? As always, your suggestions are greatly appreciated.

Cheers!

Offline sluckey

  • Level 5
  • *******
  • Posts: 5075
    • Sluckey Amps
Hoffman Amps Forum image
Re: Transformer Upgrade for Blues Jr.
« Reply #1 on: August 29, 2019, 08:34:07 am »
Here's what Doug had to say...

"The customer sent me an Allen TP24 power transformer and a Mercury Magnetics choke
The Output transformer is a Heyboer 18 watt output, which I stock"

Don't know if you'll gain anything but it's good for the economy.    :icon_biggrin:
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline MakerDP

  • Level 2
  • **
  • Posts: 396
  • I love Tube amps
Hoffman Amps Forum image
Re: Transformer Upgrade for Blues Jr.
« Reply #2 on: August 29, 2019, 10:18:51 am »
Nothing really to gain by a new power transformer.

You might get better results with a new output transformer. The Heyboer 18-watt is probably a really good choice.

Offline Tbone55

  • Level 2
  • **
  • Posts: 367
  • I love Tube amps
Hoffman Amps Forum image
Re: Transformer Upgrade for Blues Jr.
« Reply #3 on: August 29, 2019, 10:46:52 am »
Thanks guys. I was leaning towards the output transformer only in my head and you guys have convinced me. Besides, it's good for the economy. 😁


Offline Tony Bones

  • Level 2
  • **
  • Posts: 266
  • Thread Killer
Hoffman Amps Forum image
Re: Transformer Upgrade for Blues Jr.
« Reply #4 on: August 29, 2019, 05:57:29 pm »
Changing the OT has a good chance of changing the character of the amp, but how? It'll be different, but will it be closer to what you want? Nobody can answer that, not even you.

So sure, if you've paid the bills and have a few dollars left over, then spend part of it on your wife and in the interest of science and economic growth get a different OT for your amp.

 


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