The Burson modules are made by audio-gd
Here read this from the audio-gd OPA page
We are the first to made and sale HDAM (OPA): We are the first made and sale OPA-EARTH or name calls " HDAM " in China and oversea market . Through below links , can know we have design and made original HDAM begin 29-6-2005 , although these links were Chinese , but have pictures and post date . Begin at 2006 year , we OEM a lot of HDAM for a agent . In whole world , only we have the PCB files of original HDAM .
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I have some specs pulled from the OPA page that may help AMB....Kingwa is the designer and is more than happy to go into details on anything he makes...he's a pretty cool guy that seems to work 24/7....(well almost 24/7).
OPA – Earth : Our first generation discrete opamp has been sold throughout the world by other marketing means. This discrete opamp utilizes integrated cascode circuit with the schematic based on single channel circuit which is an improvement based on new improved parameters and technology. The sound characteristics is neutral and natural . THD Less than 0.0005%(1KHz), Operating voltage:±9 TO ±25V,Open loop gain:35DB,Operating current:Approx. 28MA(Single OPA),Approx. 56MA(Dual OPA).(Products have upgrade to Cap Model, use EVOX MMK capacitors. )
OPA - Moon : This discrete opamp uses dual differential gain stage and single ended output stage circuit design , we try and listen long term . The OPA-Moon sound characteristics is had a bit tubelike taste (vacuum valve) , soft and slight thick, and full of sentiment . THD Less than 0.0008%(1KHz), Operating voltage :±9 TO ±25V,Open loop gain:33DB,Operating current:Approx. 28MA(Single OPA),Approx. 58MA(Dual OPA).(Products have upgrade to Cap Model, use EVOX MMK capacitors. )
OPA-SUN (Version 2) : This discrete opamp uses full balanced circuit design which is widely accepted by our Hong Kong and American followers among our other products. THD Less than 0.0003%(1KHz), Operating voltage :±12 TO ±20V,Open loop gain:36DB,Operating current:Approx. 25MA(Single OPA),Approx. 50MA(Dual OPA).(Products have upgrade to Cap Model, use EVOX MMK capacitors. )
I fully agree the extension cable is not the best way to go....I avoid that if I can. Once I settle on a module for good I pull the socket and solder in the modules permanently if I have the room/clearance in the chassis. That is there main drawback, size. They do require a good steady supply of clean current but most applications with a 25VA transformer should have no issues I would think.
That's why I piped in when Grawk said he had the bulked up PSU.....these might be a match made in heaven with the souped up M 3. Certainly worth a try IMO.
Peete.