Harman Kardon refurbed A224 stereo tube integrated amplifier, 6BQ5/EL84, 12 WPC

  

Check my listings for some of my other tube HK amps for sale. This is a time capsule Harman Kardon refurbished tube type A224 stereo integrated amplifier, called the Trio, serial number 23839497. The HK A224 is one of the nicest EL84 tube amps of that era (about 1959), 12 WPC, nice features, good looking and performing compact amp. I had an HK A300 amp in college in the 1960's and always loved it's sound.

I've learned all that I can about these amps and have been successful in their restoration. The last picture is me with my HK A300 amp in 1965. I never put power to these amps without first replacing the electrolytic and paper/ plastic coupling capacitors. It is strongly recommended (Google recapping radios) that the electrolytic and paper or molded (original disc mica type are OK) coupling capacitors be replaced in old tube units. 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. See the two pictures,'before' and'after' recapping. After restoration I also verified the B+ voltages and critical components are to specification.

This restoration does 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. In addition to replacing the electrolytic and paper/molded coupling capacitors (using premium Orange Drop 716's for the coupling capacitors), I have tested all the tubes on my B&K 707 tube testerand 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 four output tubes are performance matched EL84's.

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 amp appearance is very good, the faceplate looks nice , I see very minor mars and scratches, the knobs are excellent, all the lettering is legible and distinct--see the pictures.

One very nice feature of the A224 is that they all originally came with a tube cover. This cover has been striped and repainted, not perfect but nice. See next to last picture, I did get a small paint run on one side of the cover, not real apparent, but it is there. Now, when the cover is removed, you will see that this has a copper flashed chassis, which is generally impossible to clean, so it looks better covered.

The amp size is a nice size-compact, about the size of a turntable. The A224, as a tube unit has a sound unlike solid state units. 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, Mode, Loudness (Volume), Bass, Treble (with power switch), Balance, and Blend. Switches are provided for rumble filter, contour, and speaker selection. The A 224 has an interesting circuit design.

It can operate in two different modes, first as a 12 watt/channel stereo amplifier, or as a stereo preamp and mono 24 watt power amplifier. There is a LH preamp out to feed a second power amplifier for this mode.

IMHF music output power12 watts per channel stereo, or 24 watts monothis was back when power ratings meant somethingplenty of power for efficient speakersbut it won't drive you out of the room. For speakers, folks like all the old Klipschs, and I personally like the Electrovoice 12TRXB's--a very nice horn type triax.

Output impedance8, 16 and 32 ohm. Stereo inputslow levelRIAA (phono) and NARTB (tape head) equilizations. Stereo inputshigh level Aux, ceramic phono, tuner this is suitable input for tuners, CD decks, and some MP3 players.

Stereo tape outputsto feed a tape recorder or second amp. LH preamp out--to feed a second power amplifier.

Tube compliment--10 tubes, all are desirable types. 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 it is rated for 100% duty cycle (you can listen to it indefinitely), when you are done listening, best to turn it off. Can be a slippery slope. So, if you are into tubes, or just starting, here is an amplifier that is ready to go right out of the box. As with essentially all vintage electronics, there is no ongoing guarantee. If there is an issue, I will work with you, check my feedback. Harmon Kardon A300 Refurbished Tube Amplifier (#230229344793) I cannot explain how wonderful this amp makes my music sound!!!

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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, Grenada, Barbados, Bangladesh, Bermuda, Bolivia, Ecuador, Egypt, Guadeloupe, Iceland, Jordan, Sri lanka, Luxembourg, Macao, Martinique, Maldives, Peru, Pakistan, Reunion, Viet nam, Uruguay.

• Model: A224
• Country/Region of Manufacture: United States
• Type: Integrated Amplifier
• Brand: Harman Kardon