ampage
Tube Amps / Music Electronics
For current discussions, please visit Music Electronics Forum. New: view Recent Searches.
New: visit Schematic Hell!
The sunn still shines online!

 
Listen to great tunes streaming live right now!

ampage archive

Vintage threads from the first ten years

Search for:  Mode:  

Variac question


 
12/15/2000 9:25 PM
Wonka
email
Variac question
Does anybody know if using a Variac with a marshall head would be a good idea. Would it be safe or harmful to my amp? I wanted to use it to lower the voltage going to the amp so I could get a good distortion at lower volumes. I also heard about the THD hotplate, but I heard it kills your tone. Does anybody have any opinions on this?
 
12/15/2000 9:30 PM
aron
email

Check this out:  
 
http://www.obsoleteelectronics.com/Marshall_Tech/marshall_tech.htm
 
 
  Wednesday
Book Of The Day The Ultimate Tone, Volume III by Kevin O'Connor
Have you ever wondered if there is a better way to build a Bassman, Champ, Plexi, an 800, AC-30, Bulldog or Portaflex? Or you wanted to build an SVT with off-the-shelf parts? How about a master-volume amp that doesn’t change tone with the master setting? Everything you need to know is right here, including: proper grounding techniques, wiring methods, and mechanical considerations. Eighteen chapters cover the “iconic” amps everyone knows and loves, with schematics and layouts for each, along with the technical history of the product. Eyelet-board and chassis-mounted tube socket construction is used throughout, for easy servicing and modding. TUT3 is very accessible even if you cannot fully read a schematic and is a "must have" if you are going to build an amp for your self.

Note: The Ampage Archive is an Amazon Associate site. A small commission is paid to the site owner on any qualified purchase made after clicking an associate link such as the one above.
 
12/16/2000 11:36 AM
JD Sleep
email

quote:
"I wanted to use it to lower the voltage going to the amp so I could get a good distortion at lower volumes."
 
 
 
 
Aren't you still going to have to run wide open to get the good distortion? BTW, if you haven't seen it, here's a great inexpensive way to get vintage voltage (from GEO)  
 
 
 
http://www.geofex.com/Article_Folders/vintvolt/vintvolt.htm  
 
 
 
(don't forget to re-bias your amp as suggested in Aron's post)  
 
 
 
quote:
"THD hotplate, but I heard it kills your tone. Does anybody have any opinions on this?"
 
 
 
 
I've heard a mesa boogie through the hotplate and it sounded pretty good. Of course some of us would argue that the mesa boogie doesn't have any tone to kill anyway :D  
 
 
 
JD
 
12/16/2000 11:42 AM
paul perry
email

I would never run equipment at less (or more) than the designed voltage. Biases shift, anything can happen. You could well **** up your amp.
 
   Page 1 of 1