DIATONE P610A(AT/AJ)/P610B 
P610A: 1,700yen(It is one price. Around 1970 )
P610AT:1,950yen(It is one price. Around 1970 )
P610AJ:1,500yen(It is one price. Around 1970 )
P610B: 1,500yen(It is one price. Around 1970 ) 
It is the unit whose model P610 changed.
P610A had three kinds of patterns "A, AT, AJ" the first stage.
A is 16ohms with the B.T.S standard item which does not carry a transformer. P610AT is 600ohms (it is 16ohms when a transformer is removed) with a B.T.S standard item. P610AJ was 16ohms in the JIS standard item.
B.T. It seems that
there was seemingly no difference of the quality of S standard item and a JIS
standard item in fact, what was extracted at random out of the JIS standard item
is surveyed, and what attached data had become a B.T.S standard item.
Moreover, the impedance of P610B was 8ohms in the JIS standard item.

System 
Single corn type full range

Aperture 
16cm 
Impedance 
P610A: 16 ohms
P610AT: 600ohms
(nothing [ transformer ]: 16ohms)
P610AJ: 16ohms
P610B: Eight ohms

The maximum input 
3W 
Output sound pressure level 
97 dB/W (with 50cm) 
Play frequency band 
80Hz  13000Hz 
The minimum resonance frequency 
80Hz 
Magnetic flux density 
10000gauss 
Effective oscillating radius 
6.5cm 
Equivalent mass of a vibration system

6.5gr 
Equivalent Q_{0 of a }vibration
system 
0.8 
Voice coil diameter 
1.92cmphi 
The total magnetic flux 
8.5x104maxwells 
Permanent magnet 
30phix25 
The diameter of baffle opening 
135mm 
Dimensions 
Width 173x depth of 94mm 
Weight 
0.75kg 


