Harman Kardon Trio A224 Vintage Tube Amplifier Classic Audio Model A224
Friday, March 27th, 2026
Harman Kardon Trio A224 Vintage Tube Amplifier Classic Audio Model A224.
Harman Kardon Allegro A10 Tube Amp Vintage MONO Audio Amplifier Not Working
Tuesday, October 7th, 2025
Harman Kardon Allegro A10 Tube Amp Audio Amplifier Mono. The Harman Kardon Model A-10 Allegro is an AC operated 5 Tube 3 Channel Audio Amplifier. Untested, assume not working. Need additional tubes to run it. Power type and voltage. Alternating Current supply (AC) / 105 – 125 Volt. This model requires external speaker(s). 10 W 16 W max. 12 x 4 x 6 inch / 305 x 102 x 152 mm. Thanks for considering?? Be sure to check out our other vintage electronics for sale!
Pioneer Kenwood Sansui Nikko Harman Kardon
Sunday, August 10th, 2025Harman Kardon Festival II Vintage Tube Amplifier (1957)
Thursday, August 7th, 2025
Actual 1957 Tube amplifier photographed. 1957 top of the line.
Harman Kardon Allegro A10 Tube Amp Vintage MONO Audio Amplifier Not Working
Wednesday, July 23rd, 2025
Harman Kardon Allegro A10 Tube Amp Audio Amplifier Mono. The Harman Kardon Model A-10 Allegro is an AC operated 5 Tube 3 Channel Audio Amplifier. Untested, assume not working. Need additional tubes to run it. Power type and voltage. Alternating Current supply (AC) / 105 – 125 Volt. This model requires external speaker(s). 10 W 16 W max. 12 x 4 x 6 inch / 305 x 102 x 152 mm. Thanks for considering?? Be sure to check out our other vintage electronics for sale!
Vintage Harman Kardon Festival D-1100 Tube Am/fm Receiver Amplifier
Saturday, May 10th, 2025
Turns on and sounds good to me.
Harman Kardon Festival II Vintage Tube Amplifier (1957 $3,000 Retail Equivalent)
Thursday, May 1st, 2025
Actual 1957 Tube amplifier photographed. 1957 top of the line. Open to fair offers.
Harman Kardon Allegro A10 Tube Amp MONO Audio Amplifier Vintage Not Working
Tuesday, April 29th, 2025
Harman Kardon Allegro A10 Tube Amp Audio Amplifier Mono. The Harman Kardon Model A-10 Allegro is an AC operated 5 Tube 3 Channel Audio Amplifier. Untested, assume not working. Need additional tubes to run it. Power type and voltage. Alternating Current supply (AC) / 105 – 125 Volt. This model requires external speaker(s). 10 W 16 W max. 12 x 4 x 6 inch / 305 x 102 x 152 mm. Thanks for considering?? Be sure to check out our other vintage electronics for sale!
Harman Kardon Allegro A10 Tube Amp Audio Amplifier Mono Vintage Untested
Tuesday, March 11th, 2025
Untested as found at a local estate, offered as is for parts or restoration. Tubes are visible inside the unit. Unit advises not to open, we are offering it as is.
Harman Kardon Allegro A10 Tube Amp MONO Audio Amplifier Vintage Not Working
Monday, March 10th, 2025
Harman Kardon Allegro A10 Tube Amp Audio Amplifier Mono. The Harman Kardon Model A-10 Allegro is an AC operated 5 Tube 3 Channel Audio Amplifier. Untested, assume not working. Need additional tubes to run it. Power type and voltage. Alternating Current supply (AC) / 105 – 125 Volt. This model requires external speaker(s). 10 W 16 W max. 12 x 4 x 6 inch / 305 x 102 x 152 mm. Thanks for considering?? Be sure to check out our other vintage electronics for sale!