What are your all's feelings on this upgrade I make to the MKIII's circuit? I am getting similar number's to Shannon's Poseidon circuit with 15dB of feedback. At present I am using KT90 tubes but KT88s will yield the same numbers as well when optimized.
The mod uses all point-to-point wiring and a sheet of stainless to replace the driver board. Cermet pots are used for the phase compensation and bias pots. Photos and the schematic are below.
![Image](http://s12.postimg.org/8nvybjw49/IMG_1077.jpg)
![Image](http://s12.postimg.org/5siv4os49/IMG_1079.jpg)
![Image](http://s12.postimg.org/tm249mvyx/IMG_1081.jpg)
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