Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Leevi on March 17, 2012, 05:55:52 am

Title: circuit for a low wattage amp
Post by: Leevi on March 17, 2012, 05:55:52 am

I'm looking for circuit for a low wattage (1-2W) amp.
Would it work in a known SE amp (like Champ) if triode mode is
used instead of tetrode mode?
/Leevi

Title: Re: circuit for a low wattage amp
Post by: tubenit on March 17, 2012, 06:54:08 am

My suggestion would be to use a VVR with a single ended amp like a Champ or the SoLow Watt.  The VVR is only $30 and very easy to install. 

http://www.el34world.com/Forum/index.php?topic=6899.0 (http://www.el34world.com/Forum/index.php?topic=6899.0)

With respect, Tubenit

Title: Re: circuit for a low wattage amp
Post by: Leevi on March 17, 2012, 01:26:03 pm

That's fully true Tubenit. A VVR makes that possible, even dynamically.
Is it enough to use VVR only for the power tube?
/Leevi

Title: Re: circuit for a low wattage amp
Post by: Leevi on March 17, 2012, 05:41:33 pm

I found this:
http://www.el34world.com/Forum/index.php?topic=7413.msg65728#msg65728 (http://www.el34world.com/Forum/index.php?topic=7413.msg65728#msg65728)

Can there be used some other Mosfets if the current and voltage specs are fulfilled?

/Leevi

Title: Re: circuit for a low wattage amp
Post by: tubenit on March 17, 2012, 07:46:04 pm

Leevi,

I have pretty limited knowledge of the VVR.  I think I've used them in 4 different amps with success but I always used Dana Hall's VVR which is inexpensive and easy to install.

You'll have to sign up to see the schematics, but I think there are numerous VVR schematics for single ended amps here:
http://www.wattkins.com/vvr (http://www.wattkins.com/vvr)

With respect, Tubenit