Full feature unit with effect send levels IN/OUT Guitar Preamp with Guitar distortion, multiband EQ, 2 channel switching, double spring reverb, (modified to make rugged and dampened spring pan for cleaner brighter spring sound, nice shorter delay / decay spring). Original spring pan. 1/4" & XLR outs. #8+ condition
Modern, semi-audiophile unit, 4-bd eq, black modern unit, tuner, phono, aux, tape, phone jack, mute, eq bypas etc.
Contact us about similar items or replacement parts.
Original Owners manual #8 condition, minor scratches on front cover. With Schematic included.
Contact us about similar items or replacement parts.
12 pin (blade type) multi-pin connector, modular type design, locking latch on front panel, all metal chasis, untested but unit is totally intact and all internal cicuits look good
Contact us about similar items or replacement parts.
Stereo Preamp, Excellent condition, very good cosmetic, Stereo Control Center, Inputs-(Tuner, 2 aux, 2 phono, 2 tape monitor loops) gain control for phono 2 / 20db Mute Switch, phono impedance controls, Toned dereat, L/R bass and treble controls, bass and treble filters, stereo, reverse L+R, L, R, Mode switch, sounds like/design similar to MAC preamps (individual resistor/circuits for tone control) highest quality parts used.
Contact us about similar items or replacement parts.
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.
Stereo Preamp, complete, excellent mechanical and cosmetic condition. Ruggedized, updated, cleaned and calibrated. Nice Unit.
Contact us about similar items or replacement parts.
Total discreet class A circuits throughout, shielded transformer, high quality level control and switch $800 for complete Sumo System, Polaris amp, Athena Preamp, and Aurora Tuner
Contact us about similar items or replacement parts.
Class A circuitry design pre-amp, very clean sounding unit, very good condition black one-sapce rack mount.
Phono Stereo preamp, with dip switches for cartridge impedance matching. Uses RCA in and professional screw terminals out. Unit can operate at AC 120 or 230 volt. Excellent #9 condition.
Contact us about similar items or replacement parts.
Tube preamplifier, with a spare E88CC tube and garden hose style Essence AC cord. This unit has (4) JJ 6922 tubes from original design, and (2) 6DJ8 vintage (looks to be Mullard from Great Britain) installed in later stage for better harmonic distortion levels (about .1%). This unit is in #9+ condition!
Contact us about similar items or replacement parts.
Shure M64 stereo preamp. 2 channels, RCA ins/outs, equalization switch for phono, flat, or tape.
Contact us about similar items or replacement parts.
Local customers, please do not come to the shop without calling ahead first - (617) 926-8020 - for an appointment, so that we can more efficiently help you with your equipment or sound recording needs.
Stereo preamp, programmable tone settings, 2 rack space, re-enforced all ground connections on RCA jacks and cleaned and serviced, excellent condition
Contact us about similar items or replacement parts.
Super-quality hand wired boards, low noise, hi-accuracy controls, 7 bnd EQ, 8 AC sockets, 3-space rack mt - speaker add on cable for interfacing amp
Contact us about similar items or replacement parts.
Tons of control, 8+ FM digital memory. Aux, CD, Tape 1/2 inputs. No phono inputs. Slim-line, black color (Adcom look), with remote. Excellent, #9 condition with box.
MM & MC inputs, Simple slimline design using super low noise AD744 OP amp. about 6db of gain extra for MC. Audiophile grade components. Bench test QC, all OK. #9 condition
Stereo Control Amplifier (preamp), black face, very simple layout, bass/treble, tone on/off, tuner/cd aux/tape 1/tape 2 inputs, tuner/cd/aux/tape 1/tape 2 REC out selectors, excellent condition, very clean, easy to use, 2 hairline scratches right hand corner
Contact us about similar items or replacement parts.
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.
RCA out, mic 1/4" stereo inputs, phono RCA in.
Contact us about similar items or replacement parts.
Phono Preamp - Solid State Stereo Pre-Amplifier, Small wall or cabinet mount box. Single Stere input/output device powered by AC line cord.
Contact us about similar items or replacement parts.
Tuner, Aux, CD, Phono, Mic inputs. Bass, Mid, and Treble EQ controls. Made minor modifications to make perfect level and EQ match between channels. New stock, QC'ed.
Stereo preamp with Tuner, Aux, CD, Mic, and Phono inputs. Tape, mono, low filter, and muting buttons. Bass, mid, treble, and volume controls. Super tweek modification to EQ and find adjustment of balance. Professionally cleaned and serviced, all controls checked and OK.
Contact us about similar items or replacement parts.
Basic Preamp. This is an excellent quality product, with high quality controls, switches. Input switching IC is same as expensive products. Low noise op amp for phono. 3 band eq. Some ground mods were done. rack mount. #9 condition
Full function stereo pramplifier, silver face, 120/240v switchable, fully cleaned and tested, truly excellent cosmetic condition.
Contact us about similar items or replacement parts.
We know you have many options for purchasing audio equipment and parts, and we truly appreciate your business. We strive to offer good products at competitive prices. While we can't always match the prices of one isolated reseller, we make up for it by carefully selecting, testing, and finding unique and special rare parts, and we are here for the long run. We guarantee everything we sell and we hope it helps you to enjoy a great listening experience.
Discrete transistor phono preamp. Has discrete version 4 channel decoder board and Phase Linear updated / best version auto correlator. RCA's in excellent condition. SUPER SPEC CALIBRATED ! channel balance +/- 1db or better (one of the most accurate units we have seen) 90% Of all power supply caps replaced & upgraded at boards and main supply. Upgraded grounding on boards and ruggedized solder at board connectors. ( By design this version 4000 does not lower the audio out signal to totally off at the back panel RCA. A very low level audio signal will always exist. The unit can be modified with a few resistor changes to be totally off if requested at sale) Low use unit, face and knobs #9 condition
Autocorrelation preamplifier. Unit has seen extremely low use time. All controls switches board connectors cleaned corrected power supply per Phase Linear update, some IC sockets and best noise version op amp installed. Repaireds some RCA inputs and fortified them with glue. Replaced various capacitors anywhere in unit which measured off spec (about 20 caps changed). Install "star ground" modification to reduce noise and RFI ruggedize all board connectors auto corrector circuit. Spec of unit noise floor and channel matching is excellent! Tracks excellent +/-1db channel match!
Contact us about similar items or replacement parts.