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
Stereo tube preamp with adjustable tube voicing, 48v phantom, digital outs, Supermodified (PS, tube, shielding/ground, noise spec, RF noise) - call for details HERE IS A LETTER TO ONE OF OUR CUSTOMERS CONCERNING DIGITAL CLOCK MOD "FADS" AND OUR ART DPS MOD: Dear customer, First of all, the clocks, stability of the clocks, or any clocks, are not the real problem in digital. I have personally never seen a problem with them, and most BSEE agree with me. Modifications to any DAC are suspicious. I am aware of this current modification “fad” but I don’t spin it. The people who claim such improvements are suspect. More problems exist concerning super sonic digital clock noise spray into the audio circuitry, and correct grounding issues, which tend to be the real culprit. In fact, this is why dither noise is added in the DAC circuits to linearize the converter so it will not see incoherent noise bursts on the digital ladder. (bit converter) Whether it is a $20 circuit or $2,000 circuit, better grounding and shielding of the DAC, clock, etc will usually solve the problem of super sonic noise ingress into the audio circuitry. This labor typically costs around $66. In the future, these supposed high cost, esoteric mods will prove to have minimal value. If you want more information, feel free to call and I will explain more about my ART modification. Also feel free to read my website, www.audioproz.com which will also explain about the ART mod and some important theory of audible effects of clever tube enhancement.
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Stereo Mic Tube Preamp, Meters Excellent level control, variable low frequency roll off, tube character is very subtle but audible **Super Modified - Engineering Unit** ask for details
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Dual Mic preamp - Full mods (RFI, Front End Pad, Impedance/Transformer-Higher output level/lower noise, PS, Hi Filter, High Freq slight harmonic distortion, plate saturation, chassis flownoise) - super quiet
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Single channel tube mic preamp, 1/2 rack space, XLR and 1/4" in/out
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We offer expert time-saving advice on repairing many types of home and studio equipment, as well as consulting for product and recording issues, at a fair and reasonable cost. For complex matters, we sometimes must charge a small technical fee. If we can help solve your repair problem or technical conundrum, give us a call. (617)926-8020.
Stereo Mic Tube Preamp, Super Fi modified for audiophile tube preamp -(higher gain/lower noise, tube, eq, pad, RF PS, mic front preamp mods). All in one Microphone preamp, Harmonic Enhancement controller, tube compressor design. The ART PRO MPA when fully modified is $990. It is truly still unique for some of the clever adjustment capabilities. The most obvious is the ability to adjust the level and phase of a very euphonic second harmonic distortion which is then gain rided. The preamp can sound thick, punchy, dense, edgy, silky, warm, strident, etc. It’s not just equalization… it is an alteration and enhancement of the original audio signal. ....read more about it here.
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8-Channel A/D & D/A Converter with 8 Mic Preamplifiers and ADAT Interface. 44.1 or 48 kHz with 24-bit resolution. Phantom power. Optical I/O. Single space rack mount.
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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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Tube mic pre with 16 voicings.
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New in box, modified tube harmonic enhancement, level match control, EQ mod, Metering Mod, Compress Mod, Transformer shield, Tube Gain mod. To learn more about the modifications on this unit, see our article here: http://www.audioproz.com/AP.php?Article=94
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Excellent quality low noise 4 mic pre mix to 2 channel (4x2 mixer). 48V ground lift, some minor updates. 5534 op amp design, 1 effects send.
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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.
Stereo Mic Tube Preamp, Super Fi modified for audiophile tube preamp -(higher gain/lower noise, tube, eq, pad, RF PS, mic front preamp mods). All in one Microphone preamp, Harmonic Enhancement controller, tube compressor design. The ART PRO MPA when fully modified is $990. It is truly still unique for some of the clever adjustment capabilities. The most obvious is the ability to adjust the level and phase of a very euphonic second harmonic distortion which is then gain rided. The preamp can sound thick, punchy, dense, edgy, silky, warm, strident, etc. It’s not just equalization… it is an alteration and enhancement of the original audio signal....read more about it here.
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XLR 1/4 in ins and out w/ phantom power - 1/2 rack/desktop design - bench tested (modified unit for shop use Bench 1)
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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, Single channel esoteric tube processor, compressor,mic preamp, semi-parametric EQ.
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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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Two channel thermionic mic preamp. New in box.
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We have been selling and repairing professional and consumer audio equipment for over 40 years. (Read some of our customers testimonials here).
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 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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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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Tube Preamp, Compressor limiter. New SN: S150760298
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Variable impedance. Two channel MIC/HIZ. M/S Matrix. Variable plate voltage switch. QC Lubed, exercised, burn-in. #10 Condition (New)
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Read about some of the modifications we do to mic pre's, ART Pro Channel Modification, ART Pro MPA Mic Preamp Modification, ART Pro MPA II Modification, and ART TPS II Modification.
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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Tube line amp - 2 channel. 1/4 inch and RCA in/out per channel. 1 rack space unit. check and select tubes for channel and nice second harmonic enhancement with high quality controls. Unit can produce nice "soft sag" for guitar in studio. Nice soft clipping.
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