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- Oct 10, 2002
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Gents, I'd like to provide some info based on things I have learned recently.
A purported schematic of the LL has been published on another forum. I have seen the schematic from the original post, but I have not followed nor read any of the ensuing discussion about it.
Some things to know...
The schematic that I saw seems to be believed to be reverse engineered from the proto LL that was at RMAF. It is, in fact, not the schematic of that amp. It is, however, a very early schematic that I drew several years ago noodling on how to make a stat amp from HV mosfets. I don't know exactly how the schematic made it into the public domain except that someone I used to work with gave it out to others (but, honestly, I don't really know).
I any case, the posted schematic has a number of flaws in it and, in particular, it is a very slow amp for a variety of reasons. But, again, it was just a preliminary design concept not a final. Any amps built from this schematic will suffer from the things that are wrong with that early concept design. There are a number of obvious improvements to be made to that design.
The pre-production and production LLs have quite a few improvements/changes including different component values, different mosfet selections in critical locations, and different balancing and offset schemes. No input was taken from ANYONE on what or how to make these changes.
I am posting this so that if you read or hear that DIY LLs based on that schematic or "improved" LLs based on that schematic are being made and measured, these are not representative of the current production LL amps.
A purported schematic of the LL has been published on another forum. I have seen the schematic from the original post, but I have not followed nor read any of the ensuing discussion about it.
Some things to know...
The schematic that I saw seems to be believed to be reverse engineered from the proto LL that was at RMAF. It is, in fact, not the schematic of that amp. It is, however, a very early schematic that I drew several years ago noodling on how to make a stat amp from HV mosfets. I don't know exactly how the schematic made it into the public domain except that someone I used to work with gave it out to others (but, honestly, I don't really know).
I any case, the posted schematic has a number of flaws in it and, in particular, it is a very slow amp for a variety of reasons. But, again, it was just a preliminary design concept not a final. Any amps built from this schematic will suffer from the things that are wrong with that early concept design. There are a number of obvious improvements to be made to that design.
The pre-production and production LLs have quite a few improvements/changes including different component values, different mosfet selections in critical locations, and different balancing and offset schemes. No input was taken from ANYONE on what or how to make these changes.
I am posting this so that if you read or hear that DIY LLs based on that schematic or "improved" LLs based on that schematic are being made and measured, these are not representative of the current production LL amps.
