BLA 1176 mods

[dreamix]

Im going through some changes/mods on the BLA 1176 circuit, here are two I found in the signal preamp and amp section. Im not sure if they added this themself to get more close in sound to the original or if its actually done to the original, its nothing Ive seen on pictures if its not attached under the board which is highly unlikely.

Any 1176 experts in here have a theory of what these mods could be doing to the circuit?

 

[dreamix]

the input transformer used in the Bluey measures around 33 ohm between the two input pins, while on an original UTC O-12 between pins 1-5 (according to schematic) measures 40 ohm, same on all my original O-12`s... connecting pins 2-5 gets around 33 ohm tho. which yields a bit hotter input level and I think a bit flatter bas response

 

[thomasdf]

interesting ! I am following : )

 

[Darkhyrys]

The green writting only are changing values?
Because other values change with my hairball rev A schematics. (Even Transistors)