Harman Kardon A224 integrated tube amplifier, refurbed to original, nice amp

  

This is a time capsule Harman Kardon refurbished tube type A224 stereo integrated amplifier, called the Trio, serial number 2360862. The A224 is one of the very nicest EL84 tube amps of that era (about 1959), 12 WPC, nice features, good performing and good looking compact amp. Dont be too concerned about the 12WPC output, the A224 has a surprising level of volume and tone.

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.

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 last 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, 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 a performance matched set of EL84's. The last two pictures show the before and after of the chassis restoration.

I have verified all the operations. The controls and switches function as designed. All the inputs are operational. I have run this unit many hours without any issues after the refurbishing.

This amp appearance is very good, the faceplate is nice , has some 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. The A224 can be used with the cover or without should you desire to watch the tubes. The amp size is a nice size-compact, about the size of a turntable.

One of the 115VAC convenience outlets on the back has been removed, it's not a good idea to use these as power feeds anyway as they put an unnecessary load on the power on-off switch. 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. In stereo mode it is configured to drive two sets of speakers.

Great for speaker A/B comparison. 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.

And many of the shelf sized speakers match well with the A224.. Output impedance8, 16 and 32 ohm, Speaker set A or Speaker Set B. Stereo inputslow levelRIAA (phono) and NARTB (tape head) equilizations. Stereo inputshigh level Aux, ceramic phono, tuner this is suitable input for tuners, CD decks, most cell phones, 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 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.

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The item "Harman Kardon A224 integrated tube amplifier, refurbed to original, nice amp" is in sale since Sunday, August 2, 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, 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.

• Model: A224
• Modified Item: No
• Country/Region of Manufacture: United States
• Custom Bundle: No
• Country of Manufacture: United States
• Type: Integrated Amplifier
• Brand: Harman Kardon