[kramer5150]

I was PM-ing with another member about an OTL tube amp whos builder claims he does not use output / coupling capacitors.  That got me scratching my head, because I am not familiar with any commercial tube amp that does not use capacitors on the outputs.  What other ways are there to block DC... besides coupling capacitors and output transformers?
 
Thanks!!

 

[jcx]

bipolar supplies, DC servo - no blocking needed

 

[kevin gilmore]

and it had better have a very fast safety circuit.
 
my bamaslama and my mig amp have dc coupled outputs and
are tubes, and tube hybrid
 
megatron is all tubes and dc coupled electrostatic, so is es1 and es2

 

[nikongod]

To add to the list: 
Berning micro-ZOTL
 
Not *exactly* headphoneish, but the Transcendent circuit is also OTL without output cap.