Tube buffer gainclone

[branet]

Does someone has a scheme for tube buffer gainclone with LM3886 and perhaps in bridge that there are about 100 w per chanale?
Thanke you?

[ChrisA]

Originally Posted by branet

Does someone has a scheme for tube buffer gainclone with LM3886 and perhaps in bridge that there are about 100 w per chanale?
Thanke you?

First decide WHY you are doing this. I assume you want the tube to add something to the sound. There is a basic "law" that says that the amount that you will be able to hear the effect of the tube is proportional to the amount of gain the tube is producing.

So you have to ask yourself how much of it do you want to hear? But nothing is free the more of it you hear the more noise and distortion is introduced. People who build guitar amps take this is the extreme.

To run a tube you need two power suplies. a 6.3 or 12.6 volt for the heater and a high voltage about maybe 250V DC for the plate. The high voltage needs only a few milliamps. Be VERY careful as tube operate on lethal voltages. You will want to keep the high voltage stuff isolated from the low voltage gain clone part. Best to use a sub-chassis.

For not much more work or cost you can build a simple tube preamp.

In fact if the plan is to bridge two chip amp. Why not build a tube preamp with balanced outputs? then use XLR interconnect to drive your balanced power amp