Had 10dB higher gain preamp. Full audio pro rev 6 modification. Has T. H. E. Tube harmonic equalizer circuit. Updated mic pre with RFI suppression. Updated tube plate volts. Updated low frequency EQ predominance. Phase corrected filter. (No loss of extreme deep bass) Has complete mod of tube vactrol auto compression and EQ at 0 dB. SN 4930. Has box. Condition #9
Standard grey faceplate, light grey knobs. Top quality preamp with Level III mods & updates by Audio Pro. Upgraded relay to 24v Omron. RFI capacitor updates. Stereo stereo imaging mod. Function select ground wire mod. All power supply & audio capacitors upgraded. Headphone jack replaced, After-market power switch, works well but requires stronger push-in to stay locked. Unit is in great shape with only minor signs of wear. Light scratching/ fading on the top of faceplate. Knobs have minimal wear/ aging. Fully functional unit with all level III audio pro mods & updates. #8+ condition
Modified with transformer, Automatic EQ compressor. This design allows deep bass and impulse response to be enhanced and less high frequency attenuation and clarity enhancement circuit. Unit has a ground modification and capacitor update for 6db noise floor improvement. This version has a 4560 op amp upgrade for line out balanced out. Mic pre amp RFI suppression capacitor. Modified with first stage tube harmonic bias control (right control) Cleaned switch with silver paste. #9 condition
Tube mic preamp/compressor/equalizer. AUDIO PROMODIFIED: Tube Harmonic T. H. E. Bias control transformer in Vactrol EQ Mod. Highly recommended, Super noise spec machine! QC, Test All. #10 new in box
Modified vactrol variable transformer dynamic EQ, and variable tube bias mod. Professional tube microphone pre-amplifier. Tube/optical compressor. +48V phantom power supply. With true "tube gain cell" compressor. B stock. See more details about the mod here, https://www. Audioproz. Com/AP. Php?Article=19&Tab=Modifications
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Bellari RP533
# 50898
Studio tube compressor/limiter preamp. AudioPro modifications to optimize tube gain and noise, power supply updates, phase switch pad and hi gain switch added on front panel. Excellent #9 condition.
Class A mic preamp. Tube Preamp, compressor, eq. Super spec unit. Special upgrade. Updated power supply to run any type tube, new, old etc. Unit can run on 90 VAC line current. Special bypass capacitors on power supply. New in box, QC - low noise spec.
Two Channel Tube Mic Preamp with digital outs. XLR I/O, 1/4 inch output. AES/EBU, SPDIF, ADAT, Optical outputs. Word Clock in/thru. Sample rate control. MS Matrix. Variable input impedence. Minor rack rash.
Can use a special add on 48 volt supply, not included with this unit. Some knobs are color blue. Rental Unit excellent serious low noise class A preamp design. #8 condition.
Two Channel Tube Mic Preamp with digital outs. XLR I/O, 1/4 inch output. AES/EBU, SPDIF, ADAT, Optical outputs. Word Clock in/thru. Sample rate control. MS Matrix. Variable input impedence. Minor rack rash.
4 channel stereo Mic preamp, 4 XLR inputs with MIC/Line select XLR L/R out, mix buss out (RCA L&R) +48v phantom power on/off Individual channel level controls & channel cueing (pull out switch) Left and Right VU meters, built in test tone oscillator. all cleaned and calibrated. can run on 120 / 220 VAC or (3) 9v Battery -up to 10 hrs operation. Low use time unit / excellent condition. #8 (small dent / scuff on back left corner)
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.
Preamp/ Processor. Modern preamp/ processor with minimalist design aesthetic. Basic but reliable design. Black/ grey faceplate & top cover. A/V 1, A/V 2, VCR, A/V Disc, Audio 1, Audio 2, CD, Tuner inputs. Digital display. Does stereo/ dolby digital/ pro logic/ DTS/ MPEG-2. *No Remote* Cosmetically good, only minor surface scratches on the top cover & volume knob. Fully functional unit #8+ condition
Excellent Condition. 3 Tape ins, spare EPL external processor loop, 2 speaker switching capable. Many modifications and updates, most capacitors in audio circuits and upgrade some power supply capacitor clean all controls switch.
Tuner Preamplifier, Very good tuner, Digital Display, Excellent condition, PS and ground mods to eliminate hum, modified headphone out to be super quiet
Black face/rack mount, digital AM/FM 10 presets, excellent tuner, use of head phone jack stops audio output by design, FM battery memory OK, re-soldered power supply board and minor service updates, cleaned and calibrated, cleaned all connectors, 1 Phono, 3 Line-ins, 3 Tape loops, NO REMOTE, Condition #8+
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. We keep our database up to date with over 10,000 items in stock.
If you see a part number and a price, we have that item in stock.
Customers outside of the U.S., please note that international shipping can be costly (US Post $24 minimum - up to 8oz or 226g). We are glad to combine orders to reduce shipping costs. Take a look at our shipping policies for more information and estimates of prices and shipping time.
Fisher 50-PR
# 27660
Phono preamplifier/equalizer, Mint Condition Cosmetically, Mono Vintage device in brown bakalite box with brass face plate, for 78 equalization, unit has powersupply upgrades, cleaned and serviced.
#201/202. Moving coil preamp for Holman. Set for 100ohm input impedance, but can be changed per customer request. All caps updated, with noise check and EQ check. New old stock.
Set for 100 ohm impedance, but can be changed per customer request. (15db gain modified). All caps updated / recapped, noise check, EQ check. OK #9 condition
Nice Modern Minimalist looking black design, good bright green digital display. Phono, CD, Tuner, (2) tape loops, AV1 Front RCA input, AV2 RCA record & play. Variable loudness, bass, treble, and balance controls, source direct & simulated stereo functions. Low use time unit, only minor ware, some oxidation on back panel. With original remote, All functions tested OK. #8+ condition
