Marshall Museum --- Mr. T's Collection vol.5

Item #7
MODEL                  ：JTM45
SERIAL NUMBER：1681
Around '65-‘66 made.  The final version of JTM45.  Since it rapidly turned into JTM50 or JMP, in fact, JTM45 with the script logo is rare.  Mr.T got it early 90’s.  After overhaul, the sound got far better.

In this “script” era, the impedance selector and the voltage selector are installed outside of the chassis, it became very practical.  The outlet at the left bottom is unknown.  The rectifier was changed with 5U4G and Groove Tube  EL34s are installed.

Enlarged photo for the impedance selector and voltage selector.

”The cast aluminum end block” for reinforcing the aluminum chassis.  It was used on JTM in the middle of 60’s.

Item　#8
MODEL                  ：1963　JTM50　MKIII
SERIAL NUMBER：PA6597
The precious wide version of PA amp head with “Gold block logo”.  4 channel JTM50PA came out in 1965 firstly.  It had the silver face with black pointer knobs. 

The rear panel.  The model name, “Super P.A. Amplifier” is shown on the left.

The inside of the amp.  4 pre valves.  When the era went into JTM50, Marshall started using EL34.  The impedance is on the top of output transformer.

Item #9
MODEL　　　　　　 ：JTM45　MKII
SERIAL NUMBER：7425
Details unknown.  It seems that the chassis of “script logo era” around '66 is installed in the wide cabinet made later.

To Be Continued...