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Harman Kardon A500

AC Operated 9 Tube Stereo Amplifier

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Harman Kardon A500


Power output: 25 watts per channel into 8Ω (stereo)

Speaker load impedance: 4Ω to 16Ω

Valve complement: 4 x 12AX7, 1 x 12AU7, 4 x 7355

Dimensions: 400 x 145 x 320mm

Weight: 15kg



Harmon Kardon A300 A500 A700

Just sharing,

I have an A50K - the kit version of A500, and I found the following very, very useful:

Best Regards!

Harman Kardon A50K

I tried your the link you had provided on hifiengine for helpful info on the Harman Kardon A50K amplifier. However, when I tried the link, I received a "forbidden" massage and could connect with the server. Do you have an electronic file of the information you acquired from this site? If so, would you be willing to share it with me. I recently picked up an A50K and was able to find schematic for A500 which appear to be identical to the A50K, however, I am looking for a users manual that describes the component inputs and would like an overall understanding of the controls.

A500 Schematic

Many thanks for making this available!

Harman Kardon A 500 integrated tube amp

Need information on refurbishing amp, coupling caps, voltage measurements (bias on outputs) etc.

oldjade's picture

Harman Kardon Favorite Vintage Tube Amp

There is one of HK's favorite model missing. It is in the "Award Series" as A 500 but smaller. The Harman Kardon A 300 is still being seeked by enthusiasts and when any one of the well preserved unit shows up at eBay auction it will receive active bidding by not less than ten bidders at a time. Member who has access to this model schematic is invited to upload such diagram for common usage. I would like to express my thanks hereby.

This website is not affiliated with or sponsored by Harman Kardon. To purchase A500 spares or accessories, please contact the company via their website or visit an authorised retailer.