Audio Proz Service and Sales

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(25 Modifications Sorted by Date : New to Old)
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ADA MP1 Guitar Tube Preamp

2024-02-12 (Modification)

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 $300.00 which includes all cost of parts and return shipping (parts may be tubes, connectors, or capacitors, about 20 parts maybe installed.)...Read Full Article

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APT Holman Preamp Upgrade And Repair

2023-06-06 (Modification)

Vince used to work for Apt and has developed certain upgrades to increase the reliability, longevity, and also the fidelity of these already remarkable preamps and amplifiers. The Apt Holman Preamp and APT 1 Amplifier upgrades consists of three levels to suit your modification needs.

APT Holman Preamp Upgrade:

Level 1: We repair the obvious faults and clean all controls and switches. We replace any obviously bad capacitors and do only minor upgrades....Read Full Article

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APT 1 Amplifier Upgrades and Repairs Technical Information:

2022-06-06 (Modification)

Vince used to work for Apt and has developed certain upgrades to increase the reliability, longevity, and also the fidelity of these already remarkable preamps and amplifiers. The APT 1 Amplifier and Apt Preamp upgrade consists of three levels to suit your modification needs. 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 Full Article

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KLH (Burwen Research) TNE 7000A Modification

2018-06-01 (Modification)

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 Full Article

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APT Moving Coil Phono Mod

2017-03-24 (Modification)

The boards are adapted to as close of input impedance match as possible when ordered (and noted on website). Many boards 210, 201A 202 etc. are very similar but differ in subtle ways because M.C. cartridge designs (even same models) varied in performance, especially in low frequency "equalization" and output level. We at APT tried to keep up with this matter and attempted to calibrate each card to within +/- 1db at 50hz (lows) for specific cartridges, but it was getting too complicated when more different M.C. designs kept coming. 201 or 202, A, B whatever, were often updated with a multi parallel input transistor board (to change impedance, slight gain, against noise parameter, etc.)....Read Full Article

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Paradigm Mini Monitors

2016-07-11 (Modification)

Details about our famous, custom rebuilt Paradigm Mini Monitors. You can't get better speakers for the money spent!...Read Full Article

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ART SLA1 Modifications

2016-06-27 (Modification)

The ART SLA-1 is an excellent quality, one rack space, 100 watt per channel amplifier. Although priced inexpensively, it is a well-built, very serviceable design that uses common parts and high-quality connectors and circuit components. The original design is done well out of the box, but we do some small and clever updates to make it a little more audiophile. ...Read Full Article

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Bellari Compressor Modification

2016-06-18 (Modification)

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 Full Article

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Behringer B2 Pro Microphone AP Modification

2016-05-27 (Modification)

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 Full Article

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Phase Linear

2015-09-12 (Modification)

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 Full Article

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(25 Modifications Sorted by Date : New to Old)
Showing Modifications (Page 1 of 3)