Mazda Code:

Consists of digits, Letters, digits. Do not confuse with a US code.

First digits give heater voltage, except that 10, 20, 30 indicate 100mA, 200mA, 300mA for series connection.

Letters give type of valve
C - Frequency changer
D - signal diode
F - signal tetrode/pentode
K - Thyratron
L - signal triode
M - tuning indicator
P - output tetrode/pentode
U - half wave rectifier
UU - full wave rectifier

Mazda codes tend not to double up letters - L is used for mulitple triodes also.

Final digits distinguish between otherwise identical codes.