Welcome To the Hoffman Amplifiers Forum

September 07, 2025, 03:43:54 pm
guest image
Welcome, Guest. Please login or register.
-User Name
-Password



Hoffman Amps Forum image Author Topic: Help troubleshooting revibe please  (Read 2006 times)

0 Members and 1 Guest are viewing this topic.

Offline dwp

  • Level 3
  • ***
  • Posts: 644
  • am addicted to iron........
Hoffman Amps Forum image
Help troubleshooting revibe please
« on: May 23, 2011, 12:10:08 am »
I just finished a re-vibe, hoffman board, repro MM iron, it has a tone issue I believe. I get a slight loss of signal strength, and very tinnie, too much treblenot enough bottom end, almost a buss on chording, etc, the lower 1/2 of the spectrum.
All features work, the reverb sounds strong, totally controllable with the pots, vibrato same, works proper. The pedals on/off, same tonal issues.
     I checked voltages, seem correct.
     I tried reversing the OT primary leads, no difference.
     does this sound like maybe I got a wrong value cap buried in there? and can someone point me in the proper area to look for the culprit?
I tried jumping around the tone pot, chopsticking, can't find anything making noise. The thing isn't buzzing or humming, dead quiet except described abovw while playing.
     one thing I did do that I have never done before is take the choke directly to a 100/100 cap can, located at the power cord end due to space constraints, then ran a lead to the B+, and the other side, fairly long lead to the node on the board. Caps far away, this an issue?
All opinions always appreciated. Thanks, dwp
 

 


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


password