El34 world logo

image
Jacks-Plugs-Connectors Hoffman Turret Boards Transformers Switches
Pots-Knobs Jacks-Plugs-Connectors Switches Hoffman Turret Boards
Lamps-Diodes-Channel Switching Tools and Batteries Capacitors Handles-Amp Trim Parts
Foot Pedals Circuit Board Building parts Pots-Knobs Capacitors
Lamps-Diodes-Channel Switching Tools and Batteries Screws-Nuts-Washers Capacitors
Capacitors Capacitors Tubes-Valves Jacks-Plugs-Connectors
Jacks-Plugs-Connectors Fuse Holders-Cords-AC Items Circuit Board Building parts Wire-Cable-Heat shrink
Pots-Knobs Tubes-Valves Tubes-Valves Lamps-Diodes-Channel Switching
Fuse Holders-Cords-AC Items Switches Resistors Pots-Knobs
Wire-Cable-Heat shrink Tube Sockets Capacitors Transformers
Lamps-Diodes-Channel Switching Resistors Capacitors Transformers
Fuse Holders-Cords-AC Items Handles-Amp Trim Parts Tube Sockets Switches
Chassis-Boxes Foot Pedals Tube Sockets Reverb tanks and Bags
Fuse Holders-Cords-AC Items Screws-Nuts-Washers Pots-Knobs Jacks-Plugs-Connectors
Tube Sockets Circuit Board Building parts Jacks-Plugs-Connectors Jacks-Plugs-Connectors
Hoffman Turret Boards Tube Sockets Jacks-Plugs-Connectors Handles-Amp Trim Parts
Fuse Holders-Cords-AC Items Transformers Jacks-Plugs-Connectors Misc Hardware-Grommets-Feet-Ring terminals
Pots-Knobs Hoffman Turret Boards Bike Light Parts Jacks-Plugs-Connectors
Misc Hardware-Grommets-Feet-Ring terminals Handles-Amp Trim Parts Chassis-Boxes Lamps-Diodes-Channel Switching
Lamps-Diodes-Channel Switching Misc Hardware-Grommets-Feet-Ring terminals Wire-Cable-Heat shrink Switches
Lamps-Diodes-Channel Switching Guitar Strings Lamps-Diodes-Channel Switching Pots-Knobs
Circuit Board Building parts Resistors Tube Sockets Switches
Tube Sockets Jacks-Plugs-Connectors Pots-Knobs Foot Pedals
Screws-Nuts-Washers Hoffman Turret Boards Lamps-Diodes-Channel Switching Fuse Holders-Cords-AC Items
Screws-Nuts-Washers Pots-Knobs Screws-Nuts-Washers Capacitors
Pots-Knobs Jacks-Plugs-Connectors Tubes-Valves Tubes-Valves
Pots-Knobs Tools and Batteries Pots-Knobs Books
Wire-Cable-Heat shrink Handles-Amp Trim Parts Bike Light Parts Capacitors
Tube Sockets Tubes-Valves Transformers Transformers
Lamps-Diodes-Channel Switching Tools and Batteries Tools and Batteries Tube Sockets
Capacitors Pots-Knobs Resistors Handles-Amp Trim Parts
Wire-Cable-Heat shrink Tube Sockets Jacks-Plugs-Connectors Misc Hardware-Grommets-Feet-Ring terminals
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 image
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
-



image

image

Home - Ordering Information - Ordering Information - PayPal info - Returning parts - Search the Hoffman Amps parts catalog
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

The Tube amp Library of information - Charts - Diagrams - How To's - Projects
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.
Check out our huge library of Tube Amp Schematics here

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.

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