8 channel tube microphone firewire preamp and interface, world clock in/thru, Fireiwre in/out, 8/8 Firewire interface (8 analog ins and outs), TRS 1/4" XLR combo input jacks, 1/4" TRS outputs, flexible monitoring, clip indicator for each channel, 48V of phantom power, up to 96K sampling rate
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Mint condition, single channel design with 12AX7 vacuum tube, -20db pad, phase switch, and 48v phantom supply. Peak and power LEDs. 60dB gain and -infinity to +10dB of output level. XLR microphone input, 1/4" TS line input, balanced 1/4" TRS and XLR outputs Table top design, very portable.
Mint condition, single channel design with 12AX7 vacuum tube, -20db pad, phase switch, and 48v phantom supply. Peak and power LEDs. 60dB gain and -infinity to +10dB of output level. XLR microphone input, 1/4" TS line input, balanced 1/4" TRS and XLR outputs Table top design, very portable.
Tube Pre-amp system-has high quality super spec 12ax7 tubes (.25 to .5% 2nd Harmonic). 2 channels with balanced or unbalanced outputs. Input for mic and instrument. Very quiet unit even with use of guitar. Later model not as well voiced for guitar overdrives. Modifications are available - Please call. Low use unit # 8 condition. (Tube Test Demo unit)
Re: International Shipping: We ship internationally often and have yet to encounter a problem or complaint. We are very careful to test the equipment before it’s packed and then to double box the machine with added protection when needed for front panels, etc. We are not amateurs or an ebay store; we know these machines very well and know what it takes to get them to you safely. We use USPS priority internationally which seems to be the cheapest. If you prefer another carrier (you should know who delivers to your area reliably) please let us know. Also please be aware of any tariffs that you may be responsible for upon pick up on your end. International shipping may be expensive but we will make sure it is not a headache on top of the cost. PLEASE NOTE THAT SHIPPING INTERNATIONALLY WILL BE A MINIMUM OF $16 EVEN FOR SMALL PARTS.
Tube microphone preamp. Audio Pro Modified for tube harmonic enhancement circuit, high quality USA Sylvania 12AX7A tube, also has IN/OUT phase, second harmonic enhance Control. Six stage tube design for preamp, compression, and equalization. New stock fully QC'ed. With true tube "Gain Cell" compressor. Super spec unit.
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Tube mic preamp modified by AudioPro. Modified gain and second order harmonic distortion for in-phase/out-of-phase harmonic. All variable gain drive for mic preamp and variable tube harmonic enhancement.
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New old stock, never used. For two channel thermionic microphone preamplifier. White lettering with gray background and purple border. Perfect condition!
AP Modified Rev4 version, new stock. Mic preamp with advanced tube harmonic enhancement. Also to be used as line level processor for adding calibrated tube character. Extra control added for precise tube enhancement. Meter mod, compression mod, transformer shield, and noise floor mod. This is a professional studio quality device!
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Professional mic and instrument tube preamplifier with USB connectivity. New stock.
Two channel thermionic mic preamp. New in box.
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We are presently operating on an APPOINTMENT ONLY basis. Please call us first at (617) 926-8020 to schedule an appointment before you come into the shop for repairs, rentals, product recommendations, consultations, or anything other than minor purchases.
Mic preamp/compressor/parametric EQ. Demo unit, engineering sample. Excellent #9 condition with some minor scratches on top and bottom of case.
Tube mic preamp/compressor/equalizer. Super spec QC. Highly recommended machine! New stock. Super spec machine!
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Tube mic preamp/compressor/equalizer. AUDIO PRO MODIFIED: 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
Two channel tube mic preamplifier. New. Highly recommended product!
Two channel microphone preamp with analog VU meters. 1/4" and XLR in/out, switchable gain, phase and Phantom, HPF adjustable 65Hz to 7Hz. With "Pultec" style cap and coil dynamic equalizer circuit. Excellent condition. This unit has been heavily modified. Read more about the modification here.
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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.
Customers outside of the US, please note that international shipping can be costly (US Post $16 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.
Project Series two channel microphone preamp and USB audio computer interface. Fully balanced XLR and 1/4" TRS inputs. New in box.
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2 mic in. 20db pad, gain control 80Hz low cut filter, polarity, phantom. With power supply. 9+ condition. Very low use time. Cleaned controls and switches. One rack scratch.
2 channels, tube gain stage preamp design. Like new unit, has better high-quality power supply. Minor scuff on top. In rack. Condition: 9
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.
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.
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
Need your guitar or bass amp tuned up? We are now doing repairs, upgrades, and modifications to all types of guitar amps. Orange, Mesa Boogie, Fender, Marshall, Hughes and Kettner, Peavey, Ampeg, Gibson, Silvertone, etc. Read more about it here
Tube with variable bias. Modified for more professional tube equalization, settings for tube gain are more subtle. REV 6/7 with modified circuit and control to adjust tube harmonics engineering sample. #8 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.