El34 world logo

image
Wire-Cable-Heat shrink Switches Reverb tanks and Bags Switches
Jacks-Plugs-Connectors Transformers Capacitors Jacks-Plugs-Connectors
Tools and Batteries Lamps-Diodes-Channel Switching Circuit Board Building parts Pots-Knobs
Tube Sockets Lamps-Diodes-Channel Switching Jacks-Plugs-Connectors Pots-Knobs
Fuse Holders-Cords-AC Items Pots-Knobs Screws-Nuts-Washers Bike Light Parts
Foot Pedals Switches Pots-Knobs Capacitors
Lamps-Diodes-Channel Switching Tubes-Valves Handles-Amp Trim Parts Tubes-Valves
Jacks-Plugs-Connectors Misc Hardware-Grommets-Feet-Ring terminals Capacitors Misc Hardware-Grommets-Feet-Ring terminals
Resistors Misc Hardware-Grommets-Feet-Ring terminals Lamps-Diodes-Channel Switching Wire-Cable-Heat shrink
Hoffman Turret Boards Wire-Cable-Heat shrink Tube Sockets Tube Sockets
Tubes-Valves Screws-Nuts-Washers Pots-Knobs Chassis-Boxes
Transformers Handles-Amp Trim Parts Jacks-Plugs-Connectors Screws-Nuts-Washers
Hoffman Turret Boards Tube Sockets Tools and Batteries Capacitors
Fuse Holders-Cords-AC Items Resistors Eyelet Boards Capacitors
Misc Hardware-Grommets-Feet-Ring terminals Jacks-Plugs-Connectors Wire-Cable-Heat shrink Screws-Nuts-Washers
Pots-Knobs Tube Sockets Screws-Nuts-Washers Hoffman Turret Boards
Transformers Fuse Holders-Cords-AC Items Jacks-Plugs-Connectors Pots-Knobs
Capacitors Fuse Holders-Cords-AC Items Tubes-Valves Pots-Knobs
Lamps-Diodes-Channel Switching Chassis-Boxes Resistors Foot Pedals
Lamps-Diodes-Channel Switching Tube Sockets Capacitors Bike Light Parts
Fuse Holders-Cords-AC Items Jacks-Plugs-Connectors Jacks-Plugs-Connectors Books
Handles-Amp Trim Parts Eyelet Boards Tube Sockets Pots-Knobs
Eyelet Boards Jacks-Plugs-Connectors Lamps-Diodes-Channel Switching Transformers
Handles-Amp Trim Parts Handles-Amp Trim Parts Tubes-Valves Transformers
Hoffman Turret Boards Lamps-Diodes-Channel Switching Jacks-Plugs-Connectors Capacitors
Tube Sockets Tubes-Valves Circuit Board Building parts Tools and Batteries
Capacitors Fuse Holders-Cords-AC Items Tube Sockets Resistors
Guitar Strings Pots-Knobs Lamps-Diodes-Channel Switching Pots-Knobs
Jacks-Plugs-Connectors Switches Tube Sockets Capacitors
Switches Foot Pedals Wire-Cable-Heat shrink Pots-Knobs
Transformers Tools and Batteries Pots-Knobs Circuit Board Building parts
Lamps-Diodes-Channel Switching Handles-Amp Trim Parts Hoffman Turret Boards Jacks-Plugs-Connectors
Circuit Board Building parts Switches Tools and Batteries
You can scroll through the images above using the Image scroll controls or you can use the Left and Right arrow keys on your keyboard.

Back to Library page
-

Stereo Pre Amp project

 This project is an all tube stereo Guitar pre amp is a 2 high rack unit.
The stereo outputs let you do ping pong delays and other true stereo effects such as chorus.
I happened to have a few pieces of a rack unit laying around and so I pieced together what I had and used some poplar to make the wooden parts.

If you purchased a 2 high rack unit, you would have to figure out how to make a divider
-
Click on the images below to see a larger image
image image
Here's the board with the lugs mounted The board with parts mounted
-
Click on the images below to see a larger image
image
Rear view of pots.
The bridge switch lets me plug into channel one and the guitar signal is then fed into both channels.
Other wise each channel is separate when the switch is off.
-
Click on the images below to see a larger image
image image
Front view Rear view. The jacks are the outputs for each channel.
-
Click on the images below to see a larger image
image image
Completed inside view External view without Face Plate
I made the rack ears from 6061 aluminum
-

-
Click on the images below to see a larger image
image Hoffman Stereo Pre amp
Schematic
image
Power supply view Layout with voltages
The power supply board sits above a 125C3A choke.
There is a 1/8" groove on both sides of the board.
The board slides into the groove from the rear and then the rear power cord panel was screwed into place.
The power transformer is a Mojo 779 reverb unit power tranny.
The front panel has a SPST on/off switch, a LED and a fuse holder.

-
Updated pictures with face plate
Click on the images for a larger image.
image
Front view of my rack setup
Top to Bottom Items in rack
Palmer Speaker emulator - Load Box
ReVibe
Stereo Pre Amp
Stereo Power Amp
-


Enter My Tube Amp Parts Store Here

Mobile users Enter My Tube Amp Parts Store Here

Home - Ordering Information - Ordering Information - PayPal info - Returning parts - Search the Hoffman Amps parts catalog
What's New - Q and A - Links - Shipping Info/policy - E-mail Me - Amplifier Service Technicians - About Hoffman Amps
Sound Clips - LED Bike light build info - Guitar Rig and Behringer FCB1010 info
Create your own custom Turret lug board

Hoffman Amplifiers Face Book Page

The Tube amp Library of information
Click the link above for Tube amp info, Schematics, Board building information, Projects, Mods, Transformer diagrams, Photo's, Sound clips.
There are hundreds of pages of Tube amp information on my library page.

Please visit my Tube Amplifier Forum
Here's the place you can go to ask tube amplifier questions.
You will find a large community of friendly amp builders at the link above.

Check out our huge library of Tube Amp schematics here

Design your own custom Turret Board or Eyelet board

@ MEMBER OF PROJECT HONEY POT
Spam Harvester Protection Network
provided by Unspam