Harman/Kardon hk725

Harman/Kardon 700s : super-high bandwidth, swift slew-rates, discrete components only, DC design and minimal use of NFB.
More of the same since the early 1970s at H/K but, this time... different. For two reasons.


One
As sternly touted by Dr Matti Otala himself in Japan over dozens of ads and articles, T.I.M. and I.I.M. were the real enemies and nothing else.
T.I.M. stands for Transient Intermodulation Distortion, a nasty one that stems out of excessive use of negative feedback and results from increased I.I.M. (Interface Intermodulation Distortion) - all from the excessive use of NFB to reduce said distortion !

According to H/K, TIM is ten times more audible than THD and can be detected at leveles as low as 0,03% - read the TECH 1 explanation for the details about all those nasty distortions few ever... suspected :)


Two
Alongwith the Citation XX series which came a bit before the 700s and which were used a lot in Japan to crown the hoped success of the 700s said 700s weren't made in the USA, just like said Citation series. They were made by the Shin Shirasuna Corporation, a company also known for products bearing the SILVER name.

If the Citation didn't have SILVER equivalents, the 700s had their counterparts in the Silver lineup, with minor cosmetic differences, different names and different distribution areas.
They nevertheless were and still are 700s in disguise - and vice-versa !

See elsewhere on TVK the details of the Shin Shirasuna / Beatrice / HK turnaround - back to topic :

The hk725 was an P725 in Japan and a Silver SP5000.

The hk725 has FET front ends for both low and high-level stages, fixed-resistor tone controls, 8-stage DC phono stage, a "twelve-wiper volume control" (instead of four) plus filters which H/K doesn't seem to have ever given the details of anywhere...