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:  

Dc Heater/Filament supply


 
1/22/2006 9:33 AM
Joe
email
Dc Heater/Filament supply
Does anyone have an effective method for converting the ac heater supply in a 5E3 circuit to DC?
 
1/22/2006 10:00 AM
Mark Lavelle
email

I think I can speak for a lot of people in saying that there is no point in converting the heater circuit in a 5E3 to DC. You will actually be risking adding noise.  
 
If you need to reduce hum, look at changing your layout.
 
 
  Tuesday
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.
 
1/22/2006 10:06 AM
Joe
email

Thanks
 
1/22/2006 10:28 AM
ukiahb
agree that an amp can be built with AC heaters with very low hum and that DC heaters are generally not worth the trouble for guitar amps....however, if you must do it, only supply the first two tubes with DC (12AY7 and 12AX7) and wire the filaments for 12v operation and in series, they will only pull 150mA this way so filtering and regulation is much easier, this is how it was done on some old tube hifi amps...RS has a 25v xfmr that would work...I have a partial schematic showing this at http://home.pacbell.net/billc99/photos/s1000ps.JPG
 
   Page 1 of 1