@nandric There is nothing special about those cartridges if you will look at the specs and diamond/cantilever types.
ADC 26 is very cheap cartridge from the 60’s, 25/27 designed before XLM series (which is crap too)
IM type cartridge with the same standard as ADC - 25, equipped with standard elliptical needle only. By adopting a newly developed magnetic circuit, we have acquired broad band reproduction, light needle pressure and racing ability. The ADC - 25, ADC - 26, ADC - 27 and the ADC - X series have stylus compatibility respectively, and it is possible to upgrade by replacing the stylus.
Model IM type cartridge
frequency band 10 Hz to 24 kHz ± 2 dB
output4.5 mV (5.5 cm / sec)
Separation30 dB (50 Hz to 15 kHz)
compliance50 × 10 -6 cm / dyne
Tracking angle15 °
Impedance47 kΩ
Tip0.3 x 0.7 mil (R-26)
Stylus pressure0.5 g to 1.25 g
Own weight 9 g
ADC 27 is next model from the 60s/70s:
IM type cartridge which aimed at cost reduction based on ADC - 25, 26.
The magnet that was attached to the conventional stylus assembly is embedded in the body at the bottom of the assembly. In addition, a magnet yoke is installed in the assembly and it is made to be magnetized when it is set. As a result, the assembly can be easily inserted and removed, there is no excess or deficiency of insertion, and the magnetic force always holds the cantilever in the center.
Because the main body of ADC - 27 is common design with ADC - 25, it is possible to use it the same way as ADC - 25 by adding stylus of R - 252 or R - 253.
Model IM type cartridge
frequency band 10 Hz to 22 kHz ± 2 dB
output 4.5 mV (5.5 cm / sec)
Separation 30 dB (50 Hz to 15 kHz)
compliance 40 × 10 -6 cm / dyne
Tracking angle15 °
Impedance 47 kΩ
Tip 0.3 x 0.7 mil (R-27)
Stylus pressure 0.5 g to 1.5 g
Own weight 9 g
ADC 26 is very cheap cartridge from the 60’s, 25/27 designed before XLM series (which is crap too)
IM type cartridge with the same standard as ADC - 25, equipped with standard elliptical needle only. By adopting a newly developed magnetic circuit, we have acquired broad band reproduction, light needle pressure and racing ability. The ADC - 25, ADC - 26, ADC - 27 and the ADC - X series have stylus compatibility respectively, and it is possible to upgrade by replacing the stylus.
Model IM type cartridge
frequency band 10 Hz to 24 kHz ± 2 dB
output4.5 mV (5.5 cm / sec)
Separation30 dB (50 Hz to 15 kHz)
compliance50 × 10 -6 cm / dyne
Tracking angle15 °
Impedance47 kΩ
Tip0.3 x 0.7 mil (R-26)
Stylus pressure0.5 g to 1.25 g
Own weight 9 g
ADC 27 is next model from the 60s/70s:
IM type cartridge which aimed at cost reduction based on ADC - 25, 26.
The magnet that was attached to the conventional stylus assembly is embedded in the body at the bottom of the assembly. In addition, a magnet yoke is installed in the assembly and it is made to be magnetized when it is set. As a result, the assembly can be easily inserted and removed, there is no excess or deficiency of insertion, and the magnetic force always holds the cantilever in the center.
Because the main body of ADC - 27 is common design with ADC - 25, it is possible to use it the same way as ADC - 25 by adding stylus of R - 252 or R - 253.
Model IM type cartridge
frequency band 10 Hz to 22 kHz ± 2 dB
output 4.5 mV (5.5 cm / sec)
Separation 30 dB (50 Hz to 15 kHz)
compliance 40 × 10 -6 cm / dyne
Tracking angle15 °
Impedance 47 kΩ
Tip 0.3 x 0.7 mil (R-27)
Stylus pressure 0.5 g to 1.5 g
Own weight 9 g