El34 world logo

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


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