APT Holman Preamplifier. Good working condition. Please photos for any imperfections. What you see is what you get. Specifications Frequency response: 20Hz to 20kHz Total harmonic distortion: 0.005% Input sensitivity: 5mV (MM), 320mV (line) Signal to noise ratio: 78dB (MM), 106dB (line) Output: 2V (Pre out), 7V (Pre out Max) Dimensions: 382 x 79 x 208mm Weight: 4.8kg Year: 1979

Vintage Apt Corporation Holman preamplifier. Picked this up with a bunch of vintage hifi gear and selling this unit. It has not been professionally tested however it powers on, hooked up the aux in and streamed some music, played through the headphone jack just fine (on my Sennheiser hd280s). Everything sounded good. However I have no idea if all aspects of it work as this is a vintage preamp from the late 70s. Cosmetically it looks to be in really good shaper (see pics). Sold AS-IS.

APT Corporation Holman Stereo Preamp with Phono. This is an amazing audiophile preamp designed by Tomlinson Holman of THX fame and built in Cambridge Massachusetts. Incredible all discreet phono preamplifier inputs with a circuit that has an infrasonic filter, adjustable loading for phono cartridge matching and allows for both MM and MC cartridges. It has a plethora of inputs and outputs: Phono 1Phono 2TunerAux 1Aux2Tape 1Tape 2 Tons of front panel features, balance, stereo width, great Baxandall tone controls with tone defeat, high filter, and left/right channel swaps so you can reverse the channels or listen to either the left or right in mono. It also has two tape loops, and an external processor loop for inserting corrective processing (EQ or Room correction) into the monitor output. It also has two main outputs, for feeding subwoofers and mains or additional amplifiers.It also has a +18v trigger output as well as switched outputs for controlling other equipment.

The Apt 1 Amplifier is a power amplifier for driving loudspeakers in a wide range of home music systems.It provides a flexible complement to the Apt/Holman pre amplifier, but it is meant to allow an optimum match, without detrimental interactions, to any other possible system components.The chosen design supplies the maximum useful power presently attainable without concessions in reliability or cost-effectiveness. It features novel approaches to protection circuitry and power supply design, as well as DC and AC stability.It incorporates psycho acoustically optimized output monitoring indicators, switching for both bridging (monaural) operation and loudspeaker impedance matching. A power transformer with low external flux minimizes the amplifiers radiated hum field.The flat, U-I lamination transformer has also allowed a convenient mechanical design, with a horizontal component layout making all parts accessible at the same time. Most servicing points can be reached by removing just the top cover and the two amplifier heat-sink modules.SpecificationsPower output: 100 watts per channel into 8? (stereo)Frequency response: 1Hz to 30kHzTotal harmonic distortion: 0.03%Damping factor: 200Input sensitivity: 0.925VSignal to noise ratio: 80dBSpeaker load impedance: 4? to 16?Dimensions: 87 x 429 x 265mmWeight: 10kg

Apt corporation ,Holman pre amplify in working condition. Shipping in conus only for $60 with 30 days return, return shipping paid by the buyer. The returned item must be in the condition as received.

POWERS ON. GOOD CONDITION PHYSICALLY. SEE PHOTOS.

Mute relay has been removed and bypassed due to failure. Some lettering missing from the front panel and some other minor cosmetic blemishes. While adjusting the volume there is some crackling like the pot is dirty. It stops once adjust. All other functions work perfectly. Power cord is a little stiff. I’ve been using this for a few months with no other issues then those listed above. Since it is a vintage component that has not been restored I am listing it as for parts/repair.

Has some cosmetic blemishes and the power cord is a little stiff. I’ve been using it for months and it has been working great. It is a vintage electronic component that has not been restored, so I am listing as parts/not working.

Has some cosmetic blemishes and the power cord is a little stiff. I’ve been using it for months and it has been working great. It is a vintage electronic component that has not been restored, so I am listing as parts/not working.

Apt corporation ,Holman pre amplify in working condition. Shipping in conus only for $60 with 30 days return, return shipping paid by the buyer. The returned item must be in the condition as received.

Near perfect condition, this is an original manual for the APt?Holman preamplifier. It has one fold-out schematic at the back, the rest is very detailed instructions on how to use the pre-amp. A great manual, it really explains much more than your typical manual would. This particular copy is from the guy that (I believe) designed the graphics for the manual.