Welcome To the Hoffman Amplifiers Forum

September 06, 2025, 09:19:35 am
guest image
Welcome, Guest. Please login or register.
-User Name
-Password



Hoffman Amps Forum image Author Topic: Power up after long sleep  (Read 3744 times)

0 Members and 1 Guest are viewing this topic.

Offline markvalluzzi

  • Level 1
  • *
  • Posts: 23
Hoffman Amps Forum image
Power up after long sleep
« on: July 22, 2012, 06:58:02 am »
  I wasn't sure what heading to post this under....  I have a Fender Concert. Built around 1983. The one that they call the Rivera period.  I have heard many different opinions on this subject and am looking for more. This amp has not been started in over 15 years. Some people say that I can just plug it in and power it up at line voltage other say no.  I do have a variac. What say you ? ? ?

Offline kagliostro

  • Level 5
  • *******
  • Posts: 7738
Hoffman Amps Forum image
Re: Power up after long sleep
« Reply #1 on: July 22, 2012, 04:58:36 pm »
If you haven't a Variac you can use a transformer (or an autotransformer) to give the amp 1/2 the usual voltage for some time (1/2 an our at least)

at the same time use a lamp limiter

if all is OK use only the lamp limiter

http://antiqueradio.org/dimbulb.htm

"Poor Man's Variac" A current limiter for testing electronics.

K
« Last Edit: July 22, 2012, 05:01:35 pm by kagliostro »
The world is a nice place if there is health and there are friends

Offline markvalluzzi

  • Level 1
  • *
  • Posts: 23
Hoffman Amps Forum image
Re: Power up after long sleep
« Reply #2 on: July 22, 2012, 05:59:56 pm »
   Thank you Kagliostro. That video is very informative. I'll share that info. with my friends

 


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