Hybrid amp schema?

[Ryssen]

Just thinking about future projects,I found this http://digilander.libero.it/essentialaudio/hybrid_main_power_amplifier_+sche.htm
and it looks nice,but does anyone have a schema with usual transistors,not mos trasnsistors??🙂

 

[jim]

Hey,

Hybrid

Jim

 

[Ryssen]

Nice! How much heat does it make,what heatsinks to use?
And a trafo 2x35v how big for 1 chanel?🙂

 

[Ryssen]

2x50v DC isn´t it a little to high for class A at 30w?Just thinking.🙄

If I where to try this one with regular transistors,e.x MJE 21193/94 or
MJ15003/04 are there any changes needed to be made?🙂

 

[jim]

Nice! How much heat does it make,what heatsinks to use?
And a trafo 2x35v how big for 1 chanel?🙂

Don't know, it's not my schematic, just one I found while surfing.
sorry,

Jim

 

[Ryssen]

Been thinking about this http://www.geocities.com/Tokyo/5913/6922.html
will it work with such a high voltage on rails in class A?
Or if i lower them a bit maybee +- 35v?

 

[Ryssen]

The tubes used in this amp http://www.wdehaan.demon.nl/hybrid/6463hyb/index.html
5687,7044 or 6463 do they have any equalents like 12AT7 or..?

 

[DoomPixie]

i recently built a hybrid amplifier useing 6922 front end.. there is a thread in this section and over in the solid state section about it.. 🙂
Owen

 

[bobo1on1]

Here is what I did, idle current is 500 mA, be sure to use multiturn potentiometers.

Oh didn't see you wanted bjt's instead of fets, why would you want that?

 

[DoomPixie]

this is what i did.... it still needs a bit of refineing and could probably do with haveing another SS stage added makeing it into a tripple darlington but it is all explained HERE I suggest you have a good read of that.. this is the circuit as it stands now and it is working on the bench, i have yet to refine it and build a final version as i got distracted by a chipamp... but it is a good start...

 

[DoomPixie]

forgot to say.. the tube section isnt in any of those schematics but it is basically the same the tube section HERE think there are a few slight differences but i cant be sure untill i am home and can look up the schematics i used... either way that tube front end should work fine as i am pretty sure it is basically the same as what i use, if not identicall.....
Owen

 

[bobo1on1]

this is what i did.... it still needs a bit of refineing and could probably do with haveing another SS stage added makeing it into a tripple darlington but it is all explained HERE I suggest you have a good read of that.. this is the circuit as it stands now and it is working on the bench, i have yet to refine it and build a final version as i got distracted by a chipamp... but it is a good start...

Try using compound pairs instead of darlingtons, because they have better linearity.

 

[DoomPixie]

i may well try what you suggested, i still have quite a few things to try with this amp, i just felt i should post the schematic because it is what the person was asking for and it has been built and tested by me and i know it works.. also am tempted to tre the CSS version of this amp..
Owen

 

[Toropkin]

http://shemki.com/schemes.htm

 

[DoomPixie]

how is that a hybrid?

 

[Toropkin]

http://shemki.com/schemas/ai51.jpg

 

[bobo1on1]

The output stage looks a bit strange though, watch out for thermal runaway.