Originally Posted by clayman0403
I'm just building a Morgan Jones OTL clone. Does it makes sense to integrate a switchable buffer circuit like for example
lt1010 for impedance matching to drive low impedance headphones? My favorite headphone at the moment is unfortunately a 32 Ohm one with a sensitivity of 98db / 1mW. The modified MJ puts out 10mW max. into 32 Ohms. I can only hope it will be loud enough.
Or would this destroy the sweet tube sound?
Pls do not answer: Then you can build a soha or other hybrids. The Soha II is already in the pipeline;)
I like the MJ & its cousins, within their limits.
Depending how "tuby" you want the amp to sound you may like just running the low impedance headphones straight off of the MJ.
If that is too tuby the best way to do what you are describing with SS parts is build the MJ with RCA outputs (as well as headphone outputs) **AND** build a very simple buffer in its own little box. It could be the chip you pointed out or a simple mosfet buffer like the Szekeres buffer as shown on headwize (my preference towards the szekeres). This has the advantage of being modular so you don't need to commit any "case space" or money to this part of the project before you know exactly what you want to do.
Be sure to include protection diodes with whatever SS parts you use - the turn-on thump from the MJ may screw up the SS bits otherwise.
Another idea (that I personally prefer) is to add small parafeed transformers to the output of the MJ clone. Not really what you asked for, but a VERY fun tangent to go off on.
Personal favorite option of all is skip the MJ and just build a simple 1 or 2-stage SET amp with a multi-tapped output transformer, but this may be way too far out.
Edited by nikongod - 4/1/13 at 11:26am