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Services by AudioProz

Saturday, May 18th, 2013  
Search For:     Site   Products   Services   Educational  

AudioProz offers a wide range of services including repair, modifications and rentals to of all types of audio equipment, including:

Amplifiers & Receivers
Tape Machines (Cassette, Reel to Reel, VCR, etc.)
CD & DVD (Players and Burners)
Compressors
Preamps (Mic and Stereo)
Effects Units (Delay, Reverb, EQ, Multi, etc.)
Keyboards and Synths
Microphones
Speakers
Turntables
+ miscellaneous electronics and accessories.

We also offer consultation and installation for sound reinforcement, studio, and Hi-Fi applications.

Over the years, the shop owner, Vince Naeve, has developed modifications to certain pieces of equipment.  These modifications will be posted here as they become available.


Rental Price SheetSep 13th, 2012
Basic Rental Prices Guideline

Piece Category Price/Day Price/Weekend Price/Week NOTES:
DBX 160S Dynamics $40.00 $60.00 $100.00
Drawmer DL251 Dynamics $25.00 $30.00 $40.00
ART VLA Pro Dynamics $20.00 $25.00 $40.00
Joe Meek VC3Q Dynamics $15.00 $20.00 $25.00
Orban 424a Dynamics $30.00 $40.00 $60.00
ART TPS II Dynamics, modified $15.00 $20.00 $40.00
ART Pro Channel Mic Pre/Dynamics $15.00 $20.00 $40.00
ART Tube Pac Tube Mic Pre/Compressor $10.00 $15.00 $20.00
Behringer T1952 Tube Mic Pre/Compressor $15.00 $20.00 $40.00
Bellari RP-282 Dual chan tube compressor $20.00 $25.00 $30.00
Bellari RP520 Tube Mic Pre $15.00 $20.00 $30.00
Presonus Eureka Class A Mic Pre/EQ/Compressor $15.00 $20.00 $30.00
Joe Meek VCSQ Mic Pre/EQ/Compressor $15.00 $20.00 $40.00
Demeter VTMP 2A Tube Mic pre, modified $25.00 $40.00 $60.00
dbx Mini-Pre Mini/portable tube mic pre $10.00 $15.00 $15.00
Alesis XTC Digital Reverb/FX $10.00 $15.00 $25.00
Alesis Quardaverb Digital Reverb/FX $10.00 $15.00 $30.00
Deltalab DL-4 Timeline Delay/FX - modified, call for details $18.00 $24.00 $40.00
Deltalab ADM-1024 Delay/FX - modified, call for details $18.00 $24.00 $40.00
Lexicon PCM-70 Delay/FX $30.00 $45.00 $80.00
Lexicon Prime Time Delay Delay/FX $25.00 $35.00 $50.00
Master Room XLR-404 Spring Reverb $15.00 $20.00 $30.00
Fostex 3180 Spring Reverb $15.00 $20.00 $25.00
Roland RE-150 Tape Echo $15.00 $20.00 $40.00
Yamaha SPX-990 Digital Reverb/FX $20.00 $25.00 $45.00
AKG 414B-ULS with shockm Condensor Mic $25.00 $35.00 $60.00
AKG 414B-EB with clip Condensor Mic $25.00 $35.00 $60.00
AKG D12 Vintage Kick/Bass Mic $20.00 $25.00 $55.00
Apex 460 Multi-pattern tube mic. $20.00 $20.00 $30.00
Audio Technica AT4041 Small Diaphram Cond. Mic $15.00 $25.00 $40.00
Audio Technica AT4050 Multi-pattern Condenser Mic $15.00 $25.00 $50.00
Behringer B-2 Pro Multi-pattern Condenser Mic $10.00 $15.00 $20.00
Beyer M260 Ribbon Mic $20.00 $25.00 $55.00
CAD e70 Small Diaphram Cond. Mic $12.00 $20.00 $30.00
CAD Trion 8000 Multi-pattern tube mic. $20.00 $25.00 $50.00
Marshall/MXL 770 Large diaphram tube mic $20.00 $25.00 $50.00
Neumann M69 Stereo Mic Vintage Stereo Tube Mic $65.00 $90.00 $180.00
Neumann U87Ai Large diaphram mic $60.00 $80.00 $140.00
Neumann U89 Large diaphram mic $60.00 $80.00 $140.00
Neumann UM-70S Multi-pattern mic. $30.00 $35.00 $65.00
Samson 5kit Drum Mic Kit 5-piece drum mic package $35.00 $40.00 $65.00
Samson CO2 Pair Small diahram cond. Mic $12.00 $15.00 $25.00
Samson VR88 Ribbon Mic with case/shockmount $20.00 $25.00 $40.00
Shure SM58 Dynamic Mic $10.00 $15.00 $20.00
Shure SM57 Dynamic Mic $10.00 $15.00 $30.00
Shure SM81 Small Diaphram Cond. Mic $20.00 $25.00 $45.00
Sony ECM-989 Stereo dynamic $15.00 $20.00 $40.00
Sennheiser MD-421-II-4 Dynamic Mic $15.00 $20.00 $40.00
Aphex Type C Processor/Exciter $15.00 $20.00 $40.00
Electro Harmonix Bi-Filter Processor/Analog Filtering $25.00 $30.00 $55.00
TC Helicon Voiceone Processor/Vox $20.00 $25.00 $40.00
ART SLA-1 Amplifier/100 wpc $15.00 $20.00 $30.00
Behringer EP1500 Amplifier/PA $15.00 $20.00 $40.00
QSC PLX1202 Amplifier/PA $20.00 $25.00 $40.00
QSC PLX1602 Amplifier/PA $20.00 $25.00 $40.00
Yorkville Amplifier/PA $15.00 $20.00 $30.00
Panasonic DAT 3800 DAT Recorder, rackmount $40.00 $60.00 $80.00 remote avail
Alesis XT20 ADAT ADAT Machine, rackmount $40.00 $60.00 $100.00 remote avail
ZOOM H4 Portable recorder, digital SD card $15.00 $20.00 $25.00 SD cards avail
Technics SL-1200 MK2 Turntable $25.00 $40.00 $65.00 black face
Behringer Eurorack MX3242X   Mixing Console $40.00 $60.00 $90.00
Behringer UB1204-FX Pro Mixing Console $15.00 $20.00 $40.00
Ramsa WR-S216 Mixing Console $30.00 $40.00 $65.00 In case
Tascam 244 Mixing Console/4-track recorder $30.00 $40.00 $65.00 with manual
Tascam 38 8-track reel to reel recorder $80.00 $100.00 $160.00
Revox B77 2-track reel to reel recorder $60.00 $80.00 $90.00
Teac A3340S 4-track reel to reel recorder $50.00 $80.00 $100.00
Otari 5050 MKIII 8-track reel to reel recorder $100.00 $120.00 $180.00
Paradigm Mini Monitor v4 Audiophile-grade, modified, pair 6.5" $20.00 $40.00 $45.00
KRK 6000 Studio monitor pair 6.5" $20.00 $30.00 $35.00
Behringer Truth 2031A Studio monitor pair 8", active $20.00 $25.00 $30.00
JBL 4401 Control Studio monitor pair 6.5" $20.00 $25.00 $40.00
Yamaha NS-10 Studio monitor pair 6.5", modified $20.00 $25.00 $35.00
Samson Resolve 50A Studio monitor pair 5", active $15.00 $15.00 $25.00
Rane PE-15 Equalizer, parametric, 1RU $15.00 $20.00 $20.00
Symetrix SX201 Equalizer, parametric, with DI input 1RU   $15.00 $20.00 $20.00
Tascam PE-40 Equalzier, parametric, 1RU $15.00 $20.00 $20.00
Behringer DEQ2496 Equalizer, mastering processor, 1RU $15.00 $20.00 $25.00
ART PRO MPA Mic Preamp Modification   (Modification)Sep 12th, 2012
All in one Microphone preamp, Harmonic Enhancement controller, tube compressor design. The ART PRO MPA when fully modified is $980. 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. PDF Manual Here This is a rough version manual we are making available now, however the final version manual will be available soon.

...Read More
KLH (Burwen Research) TNE 7000A Modification   (Modification)Sep 12th, 2012
Vince, the shop owner, has worked as chief technician at KLH/Burwen Research and knows this equipment inside and out. Recently he was asked to possibly update and improve this unit. He modified the click sensor circuit to gain ride the audio ticks to allow easier and less critical “sensitivity” and “threshold” adjustment, so that the unit tolerates a greater range of audio level coming through without false “de-clicking” of audio transients. ...Read More
Behringer B2 Pro Microphone AP Modification   (Modification)Sep 12th, 2012
First of all, most people would wonder why I should comment extensively on a microphone valued at under $200, but I would clearly explain that many $500 - $1000 mics are in fact various versions of inexpensive and similar microphones to a B2 Pro. The word is out. The recent wave of decent quality large and small plate condenser mics which proliferate the market now, are indeed Chinese, Japanese made microphones in whole or in some part. I personally will not knowingly misrepresent the facts or deceive my customers and friends into buying expensive name mics dressed up with fancy marketing. However in this business one can name “names” of good things only if you say nice things. I will comment about the real bargains which exist, and possibly alienate those people who are prejudiced towards fancy, expensive name equipment. Years from now the truth will become more obvious about the amazing quality of some “cheaper” brands. Certainly if one keeps an open mind ...Read More
Cleaning Controls and Switches   (Service)Sep 12th, 2012
A little bit of advice on old analogue equipment: controls like knobs and switches are mechanical devices in themselves and so require some specific care. These parts operate on metal (usually carbon) runners which can wear and corrode. Whenever working on a machine, we thoroughly clean and lubricate the controls, often 2 to 3 times over until clean. They can be difficult to successfully clean on some old equipment such as tube designs or even more recent machines that come from a smoky or moist environment (even proximity to major highways where there is a higher concentration of sulfur oxide and carbon oxides). These conditions can be more corrosive or staining to metal switch parts, making cleaning difficult but absolutely crucial. After returning a serviced unit to a customer, the cleaners remain active for about 2 weeks, so we recommend the controls be exercised occasionally to work in the cleaner. In general it is a good rule of thumb to exercise these controls at least once every 2 or 3 months just to keep the contact buffed. ...Read More
Reconing and Refoaming Woofer Surrounds   (Service)Sep 12th, 2012
We get a lot of calls about this matter. More and more music lovers are realizing that many older design woofers are still very competitive performing with modern parts and so it’s worthwhile to replace woofer surrounds. Personally, I’ve seen older Advent, HH Scott, some Infinity, the better original KLH, and especially a wide range of AR woofers that can perform better than some esoteric parts. Magnet, voice coil, and cone technology has made some great strides in improvement today, but most consumer-grade chain marketing speakers are certainly inferior to the great designs of the 60’s to the 80’s. To be clear however, tweeter improvements have been more remarkable due to the ability to wind more accurate voice coils and the availability of higher quality dome materials. The important advice I can give is this: Although I applaud the hobbyist who will try “do it yourself” speaker edge re-foaming, this job is actually more difficult than it appears. In my experience I seldom (if ever) see it done correctly. By the time the foam deteriorates, usually the voice coil centering spider has either bottomed out or the lacquer impregnated cloth is now off center. To do re-foaming correctly requires removal of the dust cap, insert a voice coil positioning former and a trained eye to know where the center of the voice coil falls in the magnet gap. Moreover, I see many foams which are incorrect and consequently inaccurate cone re-centering will result. A skilled re-coner knows how to shim the foam height and use the right foam thickness to ensure optimal cone vibration dampening. Even more problematic is the fact that re-foam kits don’t address the correct edge angle of foam to cone and as a result, buzzing of the foam edge will occur. Again, an experienced re-foam tech will know which foam is truly appropriate. I will get annoyed when people say it sounds fine to them, but I hear severe foam buzzing or worse, an off center voice coil rubbing on the magnet gap. In time this situation will wear away the enamel coating of the voice coil wire and expose bare copper wire at the rub area, effectively intermittently shorting the speaker voice coil. Ultimately this situation causes the amplifier to work unstably, and often causes overheating. Then, yes, the amp will burn up. In my opinion even an average re-coning tech will do a better job (from experience) than a hobbyist. I hope you will trust me on this matter, but if you consider yourself knowledgeable about speaker technology and you’re very careful, then you may get it done right. Good luck, and let us know if you do need help. ...Read More
ART TPS II Modification   (Modification)Sep 12th, 2012
It appears that ART actually did take my advice and used some of my design concepts in the TPS II Preamp. The ART TPS II is a well built and flexible preamp with one control to vary the tube gain harmonic and equalization characteristics. The original TPS II system is a bit too heavy handed and obvious when processing the preamp signal. I correct this to an even higher quality sounding device with a more usable euphonic character. The $220 rev 6 version modification makes this unit even more tempered across the fifteen presets and creates a nicer “tube” sound. This machine is beautifully built and nicer looking than even some of the really fancy stuff on the market.

Most designs create an obvious tube character by high gaining or overdriving a tube to cause a little soft fuzz quality. The modification I do creates a consistent, nice second harmonic distortion without overdriving the tube, so that the tube must create the distortion at low sonic levels, enhancing more natural and subtle sonic details in the sound. The timbre of acoustic guitars or even complete mixes passed through the unit will be thickened or brightened depending upon which of the fifteen settings is selected at the front control. In fact, the tube gain is lessened, thereby improving the noise floor and dynamic headroom. In some settings, an Output Protection Limiter (OPL) engages for a true, soft “tube limiting” of the sound. This is a less obvious effect but perfect for acoustic preamping and reduces the chances of harsh clipping effects.

...Read More
APT Holman Preamp Upgrade   (Modification)Sep 12th, 2012
Vince used to work for APT and has developed certain upgrades to increase the reliability, longevity, and fidelity of these already remarkable preamps and amplifiers. The preamp upgrade consists of three levels to suit your specific needs. ...Read More
ART Pro Channel modification details   (Modification)Mar 18th, 2011
Details on the use of our custom tube harmonic enhancement device we build inside the ART Pro Channel. ...Read More
ADS L9e Crossover Modification   (Modification)Mar 5th, 2010
We are very experienced in the repair and modification of this crossover. Our modification upgrades the power handling of the speaker to accommodate 100watt amps and they dynamic range of CD, improves fidelity, phase response and correctness, and allows the speaker to output stronger bass. ...Read More
Restoration of Model 21 and Other Solid State Vintage Radios   (Service)Sep 3rd, 2009
Dear AudioProz, I have a Model 21 that is very temperamental; sometimes it works fine and other times the sound just stops. Playing with the on off switch a few times gets it going for 5 or 10 minutes and then the problem repeats itself. I spent $40 a few years ago for a shop in Northboro to tell me that they could not repair it since they did not have the service manual. This radio is not worth a lot, but it sounds great when working. Do you repair these or is it simply not worth fixing? ...Read More
Behringer Composer Modification   (Modification)Aug 20th, 2009
Details of our modification to the Behringer Composer, which lowers the noise floor and distortion levels and smooths out the controls. ...Read More
Behringer Edison Modification   (Modification)Aug 20th, 2009
Details of our modification to the Behringer Edison stereo image correction device, which lowers the noise floor especially when used with consumer level devices. ...Read More
Behringer RM600 Rotary Machine Modification   (Modification)Aug 20th, 2009
Details of our modification to the Behringer RM600, which affects better level matching and creates a brighter and fuller effect. ...Read More
Behringer TP300 Ultra Tremolo/Pan   (Modification)Aug 20th, 2009
This mod makes the chopping effect much more pronounced and less subtle. ...Read More
CAD Trion 6000   (Modification)Aug 20th, 2009
Details of our modification to the CAD Trion 6000 microphone. ...Read More
Behringer Ultrabass EX1000 Modification   (Modification)Jul 30th, 2009
A brief introduction of our Ultrabass mod, which offers improved control and much finer detail. ...Read More
APT Upgrades and Repairs Technical Information:   (Modification)Aug 28th, 2008
The APT 1 amplifier is a truly advanced product and even by today’s standard, a very modern audiophile amplifier design. Some of it’s design technology is only now being implemented in fancy name equipment. Seldom are so many of it’s clever design tricks for correctly stabilized feed back circuits, optimized impedance matching both at input stage design, power supply and output amplifier circuit have been utilized in total (even compared to fancier products.) ...Read More
Electro Harmonix Tube Zipper Review and Modification   (Modification)May 9th, 2008
If an expensive guitar effects pedal exists, I expect it to do something special. Indeed in the EH Tube Zipper, here is another unique sounding pedal which I do not find duplicated in the DSP realm or from other manufacturers. The Zipper design is basically 4 tube stages being very high gained and over driven into a fuzz tone effect but with an auto wah filter circuit in the middle (like a Dunlop wah wah, etc. but no foot pedal to manually vary the wah) ...Read More
Concerning Spring Reverbs and Modifications available: (Response to a letter RE: Master Room XL 404)   (Modification)Mar 9th, 2007
Spring reverbs are popular again. This unit has been serviced the spring pan assemblies opened and the transducer pick up coil assembly aligned and glued down to maintain reliable operation. The springs have also been “tuned” to make the reverb smoother over a wider frequency range. This is done by slightly shortening and slightly stretching the spring in sections to tune out severe spring resonances and excessive ringing. Both channels have matching service done. The unit still sounds like a spring reverb system, but the dynamic range and quality of the reverb is richer. This unit uses 2 sets of 3 springs per channel (quite a sophisticated version). I collect and modify the Orbans, Teacs, Fostex, Furmans, and AKGs. All get the same treatment (except the AKG “torsion spring” systems which remain untouched). Often times I am also adjusting the gain/level drive to and from the spring to improve the noise and to reduce the spring “rumble”. The result is better clarity, punch and air of sound quality. ...Read More
Bellari Compressor Modification   (Modification)Jun 18th, 2006
I will comment about how my modified Bellari compressor works due to the fact that no other compressor exists that works quite like it. It uses both an optical vactrol style attenuator as well in the same circuit an audio transformer (originally a decent Beyer mic transformer) is used as a variable impedance transformer or “filter reactor” style design to assist in compression and equalization as the signal level is compressed. ...Read More
Repair of Vintage 1980’s Japanese Equipment:   (Service)Jun 11th, 2006
We have been getting more calls asking to service the Pioneer, Marantz, Kenwood, Onkyo, etc. products form the 1980’s and early 1990’s. Indeed these repairs have been a regular visitor to my shop. Recently we’ve hired in a fellow colleague who also specializes and cares for these products. We are now able to open the door for internet repair of such items. As an overview, I will explain what we do and typical cost of repair and parts used. ...Read More
Tape for Reel to Reel Decks   (Service)May 11th, 2006
We just recently acquired approximately 60 reels of Maxell Sound Recording Tape 35-180. 30 new and 30 used. The used tape was only recorded on once for classical music, and we ran it all and low speed erased it and tested. Maxell is one of the few tapes which can last 20-30 years, (possibly more if stored correctly in a cool dry place). This tape was purchased recently before Maxell stopped issuing tape to the U.S. It's been tested for shedding and wrap, it's perfect. Maxell type bias and signal levels is similar enough to GP9 (the improved Scotch 996) and soon ATR may release tape (may be within a year) but tape prices will be significantly higher than the prices here. ...Read More
Electrix Repeater   (Modification)Jan 19th, 2006
Although the Electrix Repeater is a great tool/instrument, there are several things that can be done to make it even better. Vince's modification takes care of many clicking noises made by the clocking circuit. As well as greatly reducing these noises, the modification also reduces the hum floor. The overall improvement is about a 10-20 dB drop in the overall noise. More importantly, this modification gives the Repeater increased clarity and more dynamic range. These changes greatly improve the sound when overdubbing. ...Read More
Reel to Reels   (Repair)Jan 1st, 2006
We specialize in this type of product. However, we will be limited as to what types of manufacturers we will service. I prefer to do TEAC, Pioneer, Revox, some Sony, Otari, and AKAI. I prefer not to service Tandberg, Uher, and many European brands as they are usually very troublesome and parts are scarce. It is better to call Vince directly but in general we charge $66 per hour for Reel to Reel service and the basic complete cleaning/ lubrication and calibration can easily be $100-$200 plus cost of parts, if the machine is in reasonable condition. ...Read More
ADA MP1 Guitar Tube Preamp   (Modification)Jan 1st, 2006
My circuit alterations are very neatly done and can be undone if required. The unit in general will be less buzz saw sounding and can be easier to program warm tube overdrive sound into it. Ultimately, the unit will have “Voicings” which can be made more intense or subtle, i.e. more crank, or more silky overdrive, or cleaner for the “Acoustic” sound. ADA’s engineers and I, about 20 years ago, would swap ideas and the engineer who developed this product apparently later included some of my modification into the MP2. I did this same modification for many serious pro players in the 1980’s. The cost is $195.00 which includes all cost of parts and return shipping (parts may be tubes, connectors, or capacitors, about 20 parts maybe installed.) ...Read More
Phase Linear   (Modification)Sep 12th, 2005
I've been modifying these units for twenty plus years and have come to realize many people want its sound character left intact but want to reduce the noise, poor channels separation, intermittent connectors and improved calibration of the enhancement effects is very audible and desirable. The unit still retains its same "tube-a-phonic" sound but all functions track more accurately. At this point in time I can still do the modification and repairs for about $180-(if you ship in a good box) this includes all shipping and parts to return. ...Read More
Digitech Time Machine 7.6   (Modification)Jun 15th, 2005
This modification includes adding compression, matching the delay line to clean up the echo, lowering the noise floor, and giving the unit up to 27 seconds of delay (with only slightly limited bandwidth!).This is extremely useful for avante garde and ambient artists.

The cost is $135.

This includes all modifications and shipping within the continental US. ...Read More

Contact Information

Our hours are -

Monday (12 Noon - 6pm),
Tuesday by appointment only,
Wednesday through Friday (11am - 7pm),
and Saturday from (11am - 3pm)
We are closed on Sundays.

** Employment Opportunity - Technician Needed (2012-10-12) ** We are currently looking for a Technician, with experience in Audio. Inquire Here or call us directly for more details.

** Shipping Guidelines Update (2012-10-12) **
Please do not ship any packages to us using the Fed Ex Home Delivery Service , the packages will not arrive. They only attempt to deliver during our off hours and do not leave tags. We have tried several times to remedy the situation but they seem to have an unusually hard time with the concept. For more details about our shipping policies Read Our Shipping Guidelines Here or call us directly.

** Return Policy: **
Please make sure the part # in our inventory is exactly the one you want. The manufacturers made many variations of similer parts. If you are in doubt, it is best to attach a photo of exactly what you need.

** Condition of Audioproz items: **
Unless described otherwise in the item listing, all items have been cleaned, serviced, and tested for correct functionality on a professional test bench. Items listed as parts are sold as is.
 
Phone
617-926-8020
FAX
617-926-8707
Postal address
779 Mt. Auburn St., Watertown, MA 02472
Electronic mail
Sales: sales@audioproz.com
Webmaster: webmaster@audioproz.com

Services by AudioProz

Saturday, May 18th, 2013  
HomeFeatured ItemsServicesCustom ModsEducationalAP Mix