How does the Harman Kardon hk870 power amplifier work?
Andrew Ramirez
Published May 07, 2026
How does the Harman Kardon hk870 power amplifier work?
That means the HK870 gives you louder, clearer, cleaner sound than any other 100 watt power amplifier. The HK870 maintains a negative feedback level of 18dB, far below that of most power amplifiers. But there’s much more to the HK870.
What kind of circuit is the Harman hk770?
The hk770 was an M770 in Japan and a Silver SA5050. The hk770 is a dual-mono symmetrical DC circuit design with dual quad differential cascode, two toroidal transformers, discrete components only (no IC s), protection circuit which remain out of the signal path and 250 Khz of frequency response.
Which is better hk870 or 100 watts per channel?
The HK870, with its high instantaneous current capability of 60 amps, will develop far more power under peak loads than its rated 100 watts per channel. In fact, the dynamic behaviour approaches the ideal, in that the transient power nearly doubles into 4 Ohms and nearly quadruples into 2 Ohms.
When did Cyrus stop using the Cyrus amplifier?
Cyrus stopped producing the Two (along with the original One) in the early 90s, replacing them with more sophisticated designs which added remote control and microprocessor control.
That means the HK870 gives you louder, clearer, cleaner sound than any other 100 watt power amplifier. The HK870 maintains a negative feedback level of 18dB, far below that of most power amplifiers. But there’s much more to the HK870.
The hk770 was an M770 in Japan and a Silver SA5050. The hk770 is a dual-mono symmetrical DC circuit design with dual quad differential cascode, two toroidal transformers, discrete components only (no IC s), protection circuit which remain out of the signal path and 250 Khz of frequency response.
The HK870, with its high instantaneous current capability of 60 amps, will develop far more power under peak loads than its rated 100 watts per channel. In fact, the dynamic behaviour approaches the ideal, in that the transient power nearly doubles into 4 Ohms and nearly quadruples into 2 Ohms.
Can a vintage amp alter the tone significantly?
“Recapping” a vintage amp can alter the tone significantly. If you were lucky enough to own a great old amp, why in the world would you want to alter the tone significantly? Read “Recapping . . . the Saga Continues”
