This Amber Preamp Two is in excellent condition and along with being serviced by AudioPro, has also received upgraded IC chips to 5532 and mute circuits. The back panel connectors have also been resoldered. -TAPE/AUX/TUNER/PHONE/ -Subsonic/Ultrasonic/Tape Filters -Mono/Stereo Switch/ Mute Switch -Balance/Volume Controls -Blackface 2 Unit Rack -Upgraded IC chips to 5532 -Upgraded Mute Circuit -Resoldered Back Panel Connectors
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Tuner/Preamp. CD/Tuner/Aux1/Aux2/Tape in,out/Ext Processor in,out inputs. High blend/ Countour/Bass/Treble/Balance controls. 18 Presets, AM/FM tuner. Black slimline unit with black face and digital display. Super audiophile design, extremely well built, rugged relays. Has manual and remote. Unit is virtually unused, like new condition. Condition #9+
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**We also do work on Adcom**
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Full Level III AP modifications done, super spec with all caps replaced with Tantalum capacitors. Includes kit of 16 crucial transistors, op amps, FETs, and caps for ease of future servicing. Excellent cosmetic condition.
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2 RU Rackmount preamp.
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Better quality phono, tone control slider a little sticky, but works, special enhancement EQ control. #7, missing front bezel. 7 inputs.
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Hi-Fi Stereo Pre. 2 phono in (1=100 ohm, 2=MC), 2 tape loops, 1 aux in, 1 tuner in, 1 processor loop, 2 direct out. Tone defeat and mono. Dark grey with large knobs and selectors. 1/4 inch headphone out. 8+/10 condition. Some minor paint wear. Has original box and packing. Complete service/cleaning/calibration and dialectric lube.
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Computer interface. Accurate low noise phono preamp. with digital I/O Compact all aluminum chassis. includes USB cable (NO adapter supply) #10 NEW
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Holman Pre-Amplifier. Black rack mounts. Paint is peeling at rack holes. Black handles. Infrasonic filter. Level II mods. 8+/10 condition (has minor dent at bottom center panel edge).
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Very high quality discrete circuit preamp. Audiophile build quality. All connectors, RCA panels clean and tight. All capacitors checked, are in good quality. Unit has had pro cleaning, silicon dialectic installed in switches. 8+/10 condition, minor scratches on top edge but unit has seen extremely low use time.
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Rack faceplate with chrome handles. Rack face has minor scratch at rack holes. SN:08950 All level II mods done. 9/10 condition.
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Super clean and low use condition. Original high quality tubes, Nationals made in China. These are super low noise version tubes REV 2.05. Low use time was used in personal studio, not roaded. 9/10 condition, very minor rack rash at holes, recent battery cleaned and calibrated.
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Soft black matte finish rack faceplate. Chrome handles. Unit also has all Burr Brown. SN# 6254. OPA 2134. Replaced in all line level circuits. Results in a 2db noise floor improvement but really the unit has a 93db to 96db noise with standard A.P. mod. Some light fingernail scratches on face. Unit 3 position high frequency EQ switch, middle position is an analogue EQ for CD. An extremely subtle audio improvement was noticed, but only under the the most critical and best headphone use. #8+ condition
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Pre amplifier, superior design, gunmetal gray, rack mount with rack handles, excellent phono stage, MM + moving coil class A fet design, eq circuit with turnovers (3), (bass 50/120/250 treble 3K/6K/12K), external processor (EPL loop), cosmetics excellent, low use, all control switches cleaned, #9
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(1) Stereo - "Receiver". Modified as AM-FM Tuner pre. 1 - phono, 2 - aux ins, 2 - tape loops, and 1 - CD in. Upgrade power supply parts/caps, speaker wire in to allow use of headphone or units, 2 speaker selector. Black Face #9 condition
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nice, basic preamp, EQ, updated with TL075 op amp for tone controls (lower distortion, noise), did 250pf and 18k resistors on all input jacks for RFI protection, did 50pf RFI protection on phono input, revised more correct grounding for phono input, updated power supply capacitors and improved grounding, nice face, not original bass controls, # 8 + condition
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Control Amp. (2) Phono in with selectable MC/MM, 3 position cartridge loading switch, and 3 position gain selector. Tuner, CD, Aux 1 and 2 inputs. (2) Tape loops, and (2) set main RCA outputs. (Has some DIN connectors for Tape, CD, Tuner). Complete cleaning and serviced by AP. No remote, Missing (2) function selector gap covers. #8 condition. Missing (2) Function selector gap covers for CD and Tuner
AM/FM Preamp (Preamp with built in Tuner). NO REMOTE. 6 db gain change at output circuit. Low noise for headphone out. Used excellent condition, modified unit for better nicer range on volume control. #9 condition
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Pebble Black Finish, various available. One (1) in #9 Condition- $68. Six (6) more available in various conditions, all good with no major damage, approximate #8+ condition -$46.
Stereo Control Amplifier. High accuracy EQ. GMN Stage volume and level control for a very high gain low noise FET gain, low noise FET Design. Audiophile phono pre MC and MM. Cleaning, glue removal, and board resoldering done. Low use #8+ condition SUPER LOW NOISE!, Condition #8+
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Basic preamp. Top quality phono (with correct ground layout)! Audiophile tone controls, only accent extreme high and low. 5 inputs, bad obvious light scratch at switch, #8- condition.
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Top Quality Hi accuracy, very well built product. Complete service , clean and calibration. Inputs: Phono 1 and 2 , tuner, Aux1 and 2, Tape 1 and 2 (Dubbing 1>2 2>1) Level 3 modification by AP. See description here : https://www.audioproz.com/AP.php?Article=95 #8+ condition Minor scuff on face panel.
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Super Quality Preamp, Much class circuit design, (2) new upgrade quasi op amp circuit for phono section. (2) other modules (original) have been opened and re-soldered mini circuit board, double up on Mylar preamp coupling caps. Excellent Noise Floor, MC transformer installed type 8020 40ohm load. Most caps replaced in power supply (small value types) All calibrations done for preamp module D.C. offset, new status bulbs. case and cover has few minor scuffs, Face is #9 Very low use machine #8+ condition
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AM/FM tuner/preamp. 14 presets. Bass/Treble + Balance Controls. Inputs: CD, Tuner, Tape/Tape 2, Aux. External processor loop. 1/4" headphone jack. Remote control RC-45 included. FM aligned and glue removed. #8 Condition. Note: No phono input.
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Need an APT unit serviced or modified? Vince, the owner of Audio Pro, ran the production line at APT for many years, and has decades of experience working with APT products. Read all about our APT Holman service and mods here. Also read about the APT Moving Coil Phono Mod Here.
Fancy high preamp. Class A module design. Slimline design. Bass/treble controls. MM, MC input. Headphone out. Unit does indeed have little more clarity in over all design (subtle). Some power supply upgrades of crucial resistor and rugged resoldering. #9 condition.
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Serial number J81E223. Level III mod, upgraded: all P.S. caps, all audio caps, headphone op amp, phono EQ circuit. AP correctly updated unit. Condition 9
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