Harman Kardon A300 integrated tube amplifier, refurbed to original, 15WPC 6V6

  

This is a decent, restored Harman Kardon A300 tube integrated amplifier, serial #7837387. 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 pictures10 and 11, showing the major parts changed and the before and after of the restored chassis (bottom cover removed for picture).

As a matter of course I rebuild the power supply section, using all new electrolytic capacitors and associated resistors. I choose Sprague/Vishay Series 716 Orange Drops for the the coupling capacitors. In addition to the capacitor work I have tested all the tubes on my B&K 707 tube tester and replaced any that were marginal. I verify and replace as necessary any critical components.

I also clean 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 Sylvania 6V6's. I have verified all the operations. The controls and switches work as designed.

All the inputs are operational. I have run this unit 8 hours without any issues after the refurbishing. This unit has a acceptable appearance, the faceplate and knobs are in very good condition. The lettering is essentially sharp and legible, the faceplate has some light scratches and stains. A previous owner drilled two holes in the faceplate, I covered them with metal hole plugs, see pics. The chassis has some noticeable stains, see pictures. Underneath, inside the chassis where it is important electrically, all is clean. 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 89-90 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.

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The item "Harman Kardon A300 integrated tube amplifier, refurbed to original, 15WPC 6V6" is in sale since Thursday, March 19, 2020. This item is in the category "Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps".

The seller is "camaroguy62" and is located in Fenton, Michigan. 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, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Montserrat, Turks and caicos islands, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Peru, Pakistan, Paraguay, 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