Welcome To the Hoffman Amplifiers Forum

September 09, 2025, 08:18:54 am
guest image
Welcome, Guest. Please login or register.
-User Name
-Password



Hoffman Amps Forum image Author Topic: My 6G15 project; help, ideas & comments welcomed  (Read 8953 times)

0 Members and 1 Guest are viewing this topic.

Offline warioblast

  • Level 2
  • **
  • Posts: 211
Hoffman Amps Forum image
My 6G15 project; help, ideas & comments welcomed
« on: May 05, 2017, 01:55:46 pm »
So I got all the electronic parts. I sligthly arranged the original board layout.
I want my enclosure to be kinda like a Marshall head; with the chassis laying on the bottom and the controls on the front. The tank will be mounted behind the front side; just like Fender reverbs.

As you can see on my beautiful drawing; proportions are off FIY :icon_biggrin:; I'll be putting the tranformers & the choke in the left back of the chassis. My initial question is about the Power Transformer. In the original 6G15 the PT is inside the chassis. Is it only because of a space issue ? Or does it have to do with something else, like interference with the tank or whatnot ?
« Last Edit: May 05, 2017, 02:00:30 pm by warioblast »

Offline sluckey

  • Level 5
  • *******
  • Posts: 5075
    • Sluckey Amps
Hoffman Amps Forum image
Re: My 6G15 project; help, ideas & comments welcomed
« Reply #1 on: May 05, 2017, 03:23:00 pm »
Placement of the PT is more of a physical layout issue. Inside or outside the chassis is not really important. But you still got to follow some layout rules, such as keep the PT away from sensitive low level signal areas. I built a revibe rather than a 6G15 and I put the PT inside the chassis. The layout I wanted to use required the PT to be inside. My layout is similar to what you want except I mounted the reverb tank on the chassis.

Not saying you should copy my layout but at least take a look. It may give you some ideas about your particular layout...

     http://sluckeyamps.com/revibe/revibe.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 warioblast

  • Level 2
  • **
  • Posts: 211
Hoffman Amps Forum image
Re: My 6G15 project; help, ideas & comments welcomed
« Reply #2 on: May 05, 2017, 04:25:58 pm »
Thanks Steve. :thumbsup:

Your revibe page is already in my bookmarks.  :icon_biggrin:
« Last Edit: May 07, 2017, 06:44:02 am by warioblast »

Offline warioblast

  • Level 2
  • **
  • Posts: 211
Hoffman Amps Forum image
Re: My 6G15 project; help, ideas & comments welcomed
« Reply #3 on: May 07, 2017, 06:43:46 am »
It's on  :wav:
« Last Edit: May 07, 2017, 07:34:36 am by warioblast »

Offline warioblast

  • Level 2
  • **
  • Posts: 211
Hoffman Amps Forum image
Re: My 6G15 project; help, ideas & comments welcomed
« Reply #4 on: May 07, 2017, 11:45:40 am »
My buss wire was too thick for a proper lacing.  :icon_biggrin:

Offline warioblast

  • Level 2
  • **
  • Posts: 211
Hoffman Amps Forum image
Re: My 6G15 project; help, ideas & comments welcomed
« Reply #5 on: May 23, 2017, 12:23:29 pm »
Tomorrow is drilling day.

Offline warioblast

  • Level 2
  • **
  • Posts: 211
Hoffman Amps Forum image
Re: My 6G15 project; help, ideas & comments welcomed
« Reply #6 on: May 31, 2017, 03:10:52 pm »
Should I twist the wires from the OT   :dontknow:

Offline Willabe

  • Global Moderator
  • Level 5
  • ******
  • Posts: 10524
Hoffman Amps Forum image
Re: My 6G15 project; help, ideas & comments welcomed
« Reply #7 on: May 31, 2017, 11:56:23 pm »
Yes, I would.


Offline Willabe

  • Global Moderator
  • Level 5
  • ******
  • Posts: 10524
Hoffman Amps Forum image
Re: My 6G15 project; help, ideas & comments welcomed
« Reply #8 on: June 01, 2017, 12:01:03 am »
What OT do you have?

It looks like your OT has too many wires?

Offline warioblast

  • Level 2
  • **
  • Posts: 211
Hoffman Amps Forum image
Re: My 6G15 project; help, ideas & comments welcomed
« Reply #9 on: June 01, 2017, 07:30:55 am »
It's a Hammond 1760C. I cut the primary 5000 ohms and secondaries 3.2 & 16 ohms out.

Offline warioblast

  • Level 2
  • **
  • Posts: 211
Hoffman Amps Forum image
Re: My 6G15 project; help, ideas & comments welcomed
« Reply #10 on: June 01, 2017, 11:20:41 am »
Soldering is done... Hopefully.

Offline Willabe

  • Global Moderator
  • Level 5
  • ******
  • Posts: 10524
Hoffman Amps Forum image
Re: My 6G15 project; help, ideas & comments welcomed
« Reply #11 on: June 01, 2017, 01:27:38 pm »
Should I twist the wires from the OT   :dontknow:

Looks very nice, IMO much better!  :icon_biggrin:

Offline warioblast

  • Level 2
  • **
  • Posts: 211
Hoffman Amps Forum image
Re: My 6G15 project; help, ideas & comments welcomed
« Reply #12 on: June 01, 2017, 01:41:38 pm »
Yeah and it matches the heater wires  :occasion14:

Offline warioblast

  • Level 2
  • **
  • Posts: 211
Hoffman Amps Forum image
Re: My 6G15 project; help, ideas & comments welcomed
« Reply #13 on: July 07, 2017, 06:50:01 pm »
I finally finished my cabinet. I'll post pics later. I wanted to show you guys how it looks and sounds with a little video but it turns out my build isn't as noiseless as I thought.  :sad2:

I have 2 issues:
_ past the 1st third of the tone knob and depending on the orientation of the cabinet, I get a repetitive, percussive sound, almost like a morse code. It's the same sequence that goes on and on. Mixer knob affects its volume, but the dwell control has no impact on it.

_ I was trying to find out if my reverb was humming or not. My amp is already humming a bit so I put the reverb in a true bypass box. I discerned a little background noise. If you don't pay attention you don't really notice it. So it's not a big concern but if I could get rid of it  :icon_biggrin:
It's hard to describe what I'm hearing. It's not a hum. It's not a hiss. It's more a shushing.

Offline warioblast

  • Level 2
  • **
  • Posts: 211
Hoffman Amps Forum image
Re: My 6G15 project; help, ideas & comments welcomed
« Reply #14 on: July 08, 2017, 11:16:33 am »
Here it is.

 


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