Hi David, we may disagree on whether on not conventional OTLs have weakness that other arts do not; that is a matter for elsewhere.
You misinterpreted my request for an explanation of the air core transformer's function. I was asking if it is an OTL, how can there be a transformer essential to its function in the output section. The acronym is for "TransformerLess". In plain English, this means that there is no transformer, aircore or otherwise.
So we also disagree on semantics. Even though the air core device you use does indeed allow for DC response, it is nonetheless a defined as a transformer by the electronic texts (any physics prof will disagree with you also). Even though it is supplying the power for the output tube... well, with this simplified description, that happens with a lot of output transformers (although not in the same way). And, if you strip the 250KHz out of the signal that the air core transfers, there is an audio signal that is the resultant. Plus, if you trace from the speaker terminals back through the circuit, you do not find it connected to the elements of a tube (not even through a coupling cap)- it is connected to the tube via a DC to DC converter and an aircore transformer.
This is clearly not an OTL. Technical explanations to the contrary have, for the last 7 years, amounted to obfuscation.
Now the odd thing to me is this: Before you came along, there were two techniques for coupling output tubes to loudspeakers: the transformer coupled way and the OTL way. All tube amps made prior to this invention operated on some varient of the the above two techniques.
Now there is a third way and you invented it! Why, for heaven's sake and for your own, would you not take advantage of the tremendous marketing opportunity that represents??
Of course, I know that you are not referring to me in some of your comments directed at OTLs :) Controlling bias so that is does *not* drift, and providing as much current as a transistor amplifier are two of the things that we do. But I agree that those are problems with (other) current and past OTLs.
You misinterpreted my request for an explanation of the air core transformer's function. I was asking if it is an OTL, how can there be a transformer essential to its function in the output section. The acronym is for "TransformerLess". In plain English, this means that there is no transformer, aircore or otherwise.
So we also disagree on semantics. Even though the air core device you use does indeed allow for DC response, it is nonetheless a defined as a transformer by the electronic texts (any physics prof will disagree with you also). Even though it is supplying the power for the output tube... well, with this simplified description, that happens with a lot of output transformers (although not in the same way). And, if you strip the 250KHz out of the signal that the air core transfers, there is an audio signal that is the resultant. Plus, if you trace from the speaker terminals back through the circuit, you do not find it connected to the elements of a tube (not even through a coupling cap)- it is connected to the tube via a DC to DC converter and an aircore transformer.
This is clearly not an OTL. Technical explanations to the contrary have, for the last 7 years, amounted to obfuscation.
Now the odd thing to me is this: Before you came along, there were two techniques for coupling output tubes to loudspeakers: the transformer coupled way and the OTL way. All tube amps made prior to this invention operated on some varient of the the above two techniques.
Now there is a third way and you invented it! Why, for heaven's sake and for your own, would you not take advantage of the tremendous marketing opportunity that represents??
Of course, I know that you are not referring to me in some of your comments directed at OTLs :) Controlling bias so that is does *not* drift, and providing as much current as a transistor amplifier are two of the things that we do. But I agree that those are problems with (other) current and past OTLs.