Mark I vs Mark II

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Differences between the Mellotron Mark I and Mark II

...as compiled by Mellotron Professor Jerry Korb, who has done extensive analysis of both types of machines.

LIST OF MELLOTRON MARK-1 S/Nís
and
DIFFERENCES between MK1 and later MK2 Mellotrons

MKIs not converted are numbers 120,122,124,130,131,132,and 137. (Boldface units have been located)

Following is list of known items for you MK1-spotters out-there:

Item Description or Location

Mark-One Details

Mark-Two Details

     

Tape Storage Box Cover

Rear Edge Rolled as Tape Guide

Alum guide bar fitted adjacent to cover

Tape Storage Box

Dovetail Joints on Corners

Square Joints on Corners

Cycling Drive System

Meccano Sprockets and Ladder Chain

Reynold Sprockets and Roller Chain

Keyboard

 

Rotation Adj. Screws on White Keys

Keyboard

Beige or Ivory Key Colour

White Key Colour

Keyboard

Meccano Chain Tensioning Wheel

 

Pad Arm Assembly

Parallel to Headblock

Angled at 20 degrees to Headblock

Reinforcing Braces

 

Fitted from center board to each end

Cabinet Venting/Cooling

Solid Top Rear Panel

Drilled Holes or Slots,Top Rear Panel

Control Panel

Five Coax and 1 special for Pitch Ctrl.

Octal Combi-Connector at LH side

SSCU Switch

Micro-Switch SW1 to activate SSCU

Not used/needed on MK-II models

Rotary Synch Switch

BA-9 Connector to Control Panel

Hardwire connections synch switch

Capstan

 

Carbon Brush fitted to RH end

* Keylock

Fitted ahead of keys on earliest units

Fitted 6" inboard . Keys machined

Power-Pack

6 Caps,all connec atop crossmember

7 Caps,connec at each end

Volume Footpedal

Mecccano gears/hdwe

Slider assembly

Control Panel Reinforcement

Centre Mahogany Brace

Present on some,not other units

Headblock Channel

Straight Piece,with alum end-stops.

Causes occasional "Tape-Zip"

Machined 1/8" cutouts for vinyl rollers

     

 

*John Bradley told me only the first few machines had this early keyboard interlock fitted in front .  Only one other unit, a MK2, has this installed.  Guess that one on MK1/124 was overlooked.