Harman Kardon A300 integrated tube amplifier, refurbed to original, 15WPC, nice

  

This is a nice, restored Harman Kardon A300 tube integrated amplifier, serial #4886321. See feedback on my amps and receivers at the end of listing, newer comments on the bottom. I had an A300 amp in college in the 1960's and always loved it's sound.

I've been restoring HK tube amps and receivers for a few years now as a hobby. I've learned all that I can about these amps and have been successful in their restoration. See last picture, that's me in 1965 with my original A300. I never put power to these amps without first replacing the electrolytic and coupling capacitors and diodes. It is strongly recommended (Google'recapping radios') that the electrolytic and coupling capacitors be replaced in old tube units.

For the A300 there are a total of seven electrolytic capacitor sections in the power supply and a total of eight coupling capacitors to be replaced, which I have done. Some people say it's OK just to'reform' the power supply caps. (bring them up very slowly over a couple of days on a variac).

While this is a much simpler and less costly alternative, I'm not convinced that it is a good as replacing dried out caps with new current fresh stock. The new caps are mounted under the chassis, while retaining the'can' on the top of the chassis (electrically disconnected) to maintain the aesthetics of the unit. After restoration I also verified the B+ voltages and critical components are to specification. I also replace the rectifying diodes with more modern units that have fast turnoff/soft recovery, characteristics that provide a little less noise-- makes for a cleaner power supply. No change in the sound of the amp, only just a cleaner power supply.

These restorations do not modify the wonderful'tube sound' --no real modifications, but rather put back the way the HK engineers designed it, only make the unit safer and more reliable. See pictures 9,10 and11, showing the major parts changed and the before and after of the restored chassis (bottom cover removed for picture). In addition to the electrolytic and coupling capacitors (using premium Series 716 Sprague Orange Drops capacitors for pre-amp tube coupling and Russian K40Y PIO caps for power tube coupling), I have tested all the tubes on my B&K 707 tube tester and replaced any that were marginal.

I also have cleaned the tubes, tube sockets, controls and switches (Deoxit D5 contact cleaner for the tube sockets and switches, F5 Fader Lube for the potentiometers). The output tubes are performance matched RCA 7408's, essentially a rugged 6V6 tube. I have verified all the operations. The controls and switches have no noise. All the inputs are operational. I have run this unit 8 hours without any issues after the refurbishing. This unit has a nice appearance, the faceplate and knobs are in good condition.

The lettering is essentially sharp and legible. The faceplate has some light scratches and stains as does the chassis top, The most noticeable issue is a light scratch to the right of the balance control, depending on the lighting it's either visible or disappears, see pic. I replaced the pilot lamp with a LED, has a longer life and a little less load on the filament transformer. The A300, as a tube unit has a sound unlike solid state units. The Harmon Kardon A Series are referred to as Award Series.

Not sure what the Award was, but these were (and are) highly regarded amplifiers, and have that highly desired'tube sound'. Interesting that HK is one of the very few hi-fi companies of the 1960's to still be in business. As a stereo integrated amplifier, there are inputs for lo level (magnetic) phono or tape head, hi level (ceramic) phono, tuner and auxiliary inputs. The controls are: Source Selector, Loudness (Volume), Bass, Treble, Balance, and Blend. Switches are provided for power, rumble filter, contour, equalization and stereo reverse. IMHF music output power: 15 watts per channel. This was back when power ratings meant something, plenty of power for moderately efficient speakers. I prefer Electrovoice 12TRXB's--a very nice horn type triax speaker.

I've heard good reports from buyers using the vintage Klipsch's too. This amp (as with other vintage tube amps) likes efficient speakers, best to have speaker sensitivity of about 90-92 db or greater. Frequency response--+/- 1 db 15-70,000 cps at normal listening levels. Output impedance: 8 and 16 ohm.

Stereo inputs-low level: 3.0 mv. Stereo inputs-high level: 125 mv. This is suitable input for tuners, CD decks, most smartphones, tablets, etc. Stereo tape outputs: To feed a tape recorder or second amp. This is not your son's amplifier.

This is a tube unit, and as such, has voltages inside the chassis that can be lethal, 350+ volts. Also, it has tubes and a power transformer that gets hot. Although this amp is rated for 100% duty cycle (you can listen to it continually), when you are done listening, turn it off. And turning the lights down just so you can watch the soft orange glow of the tube filaments, and talking about bias, tube rolling, and'gee I need to get another system for the family room'. Can be a slippery slope.

So, if you are into tubes, or just starting, here is an amplifier that is restored back to the original design specifications. As with essentially all vintage electronics, there is no ongoing guarantee. If there is an issue, I will work with you, check my feedback. For international buyers this A300 operates only on 115VAC, if your grid is 230VAC, you will need a stepdown transformer.

If your country is not listed, contact me, maybe we can work something out. Harmon Kardon A300 Refurbished Tube Amplifier (#230229344793) I cannot explain how wonderful this amp makes my music sound!!! Harmon Kardon A300 Recapped Tube Amplifier (#330277726387) Impressive! Packed like a true engineer! Got me, the amp flew me.

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This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica, Grenada, Barbados, Bangladesh, Bermuda, Bolivia, Ecuador, Egypt, Guadeloupe, Iceland, Jordan, Sri lanka, Luxembourg, Macao, Martinique, Maldives, Peru, Pakistan, Reunion, Viet nam, Uruguay.

• Country of Manufacture: United States
• Model: A300
• Modified Item: No
• Country/Region of Manufacture: United States
• Custom Bundle: No
• Type: Integrated Amplifier
• Brand: Harman Kardon