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Harman Kardon 430

Twin Powered Receiver (1976)

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Harman Kardon 430

Specifications

Tuning range: FM, MW

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

Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.3%

Damping factor: 40

Signal to noise ratio: 65dB (line)

Speaker load impedance: 4Ω to 16Ω

Dimensions: 432 x 368 x 140mm

Weight: 10.9kg

Downloads

instruction/owners manual  English

service manual  English

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Reviews

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rating
Submitted by tonefoto56

I've been looking at other reviews of this receiver and found most are glowing which is what prompted me to write this after my recent auction site purchase of one. Its design is relatively austere, keeping to the same 330C looks without function lights. Not a big deal but wondered why HK chose to eliminate them and keep all the dial lamps lit with the phono or aux section on. I liked the previous 630/930 lighting setup more which made sense. The lack of pre/main jumpers isn't a dealbreaker but another reason I suppose to go for the 730 instead of the 330/430. Now here is the subjective part; most of the reviews I read on the audio sites claimed a superior sounding 430. I don't find that the case in my example. I find a rather low-powered but average appealing sound suitable for a small office or bedroom capable of driving bookshelf speakers adequately. I didn't find the tuner especially adept at finding and holding stereo broadcasts well and found my tuning meter to be flakey. The phono section is just OK, nothing more, I just don't see what the big deal is about this amp, the controls of lo cut are almost imperceptible, the contour is overdone. The knobs have very slight detent markers which are impossible to see, having to use your sense of touch to feel the marker etching to find the position. I always end up going back to my Marantz 2245 over the HKs and I've had the 330B, 630 and 930 twin power. I do find the HK 430 appealing in its design so I'm guessing this the main attraction. In all honesty, the NAD 20 watt per channel 7120 outperforms this HK 430 for its price and size, I don't think it can be beat for its sound either, just looks like you need to hide it. Just my 2c. of course, realize that my not so excited opinion is also based on the prices these amps fetch on the big auction site.

 

Comments

re: 430 redux

Since posting my original comments on the HK 430 my opinion has changed on this model after owning its big brother HK 730. The 430 in comparison has a less grainy and more smooth sound, not as powerful to be sure, but all in all very satisfactory. I've had 4 or 5 HK 430s and found the tuners to vary also.

re: 430

The main attraction of the 430 is the sound for most enthusiasts, not appearance or lights. Even back in the seventies when this amp was made it stood out. I sold these and many other brands at a hi fi store during college. The 430 had a rep even back then and was demonstrably better sounding than other brands and than its siblings the 330C, 630 and 730. I had forgotten about it until recently. After hearing much about this receiver and hearing it sound pretty grand in a friend's large system, I ended up buying several units in various states of repair. I got them all functioning. So here's the deal: they vary widely in sound quality. Some sound punchy and really express the music, while others can sound a bit "blah". I don't know if this is due to aging causing some separation among the survivors or if there were always differences. I suspect both. That same friend of mine has rebuild several of these. He makes sure key transistors are closely-matched (some are already, some not) and he puts in new electrolytic caps, preferring Elna Cerafine and Silmic caps. He has even experimented with new wiring inside. So I took the best sounding of my lot and redid the caps and wiring too. It now sounds pretty stupendous and seems far more powerful that 25 watts.

So, caveat emptor.

re: 430

Hi tech user

It sounds like you have some experience with these. I wonder if you can give me some advice or point me somewhere for help. I have an old 430 and like it very much.

I was recently doing a little bit of re-wiring to replace the display with LEDs and when I switch it on it smokes. I have found the component that is overheating - it is R9 a resistor between fuse 1 and rectifier board A. The resistor measures only 10 Ohms and according to the manual looks like this is right (it says 8.2). When the amp is switched on this fuse actually glows faintly it is so hot ! Something is wrong but I am not sure where to look. Have you any ideas or know of somewhere I could look?

I don't *think* that it was my bad DIYing as the lamp circuit is driven from T1 but the glowing resistor is connected to T2.

I am switching on the amp without speakers though at min. vol and set to aux with no input - so I assume that is OK ?

Any advice or help appreciated. I'd really like to get this back in working order.

re: 430

I think I have found the problem (I hope). I Think I may have blown the transistor on the regulator A board. The 15 ohm resistor going into the collector of the regulator/transistor is also burnt. I plan to replace both the transistor and the resistors. Do you think the rectifier and capacitors are also likely to be blown? thanks!

This website is not affiliated with or sponsored by Harman Kardon. To purchase 430 spares or accessories, please contact the company via their website or visit an authorised retailer.