March 2011

This is an interesting four-page article plublished in the April 2011 issue of The Absolute Sound magazine. I think it describes the most important contribution to music restoration that has happened in many years. And I am amazed by the computer technology employed! Zenph is not a record label but they work with record companies to creat "re-performances" -- there are currently three releases from Sony.
Please click here to download. The article size is about 1 MB.

March 2011
I have added a page on designing the Nashville Pro Guitar Amps for GMS, Inc. It includes circuit diagrams, circuit boards, photos and notes. I had to redraw many of the 35 year old drawings because they would not copy or scan. This info is free for use by anyone who has an interest in it. Please click here to take a look.

December 2010
We have updated our Music Sources page and have added three new entries: Arkiv Music, HDTracks and Jazz Record Mart. Ckeck it out at by clicking here.

December 2010
Three new magazine articles have been published in December issues of audioXpress and VoiceCoil. Please take a look at magazine articles numbers 29, 30 and 31.

November 2010
We have added a "CONTACT US" bar to the main menu to better keep you up to date. We have a new toll-free FAX number too.

October 2010
Introducing our NEW model 415 Balance-Control and Mode-Switch. This unit adds additional restoration, and listening, capability to most stereo phono preamplifiers and receivers (including our models 407 and 408). You can take a look at the data sheet and user guide by clicking here.

September 2010
Introducing our NEW model 4011 "The Model 4010 Companion" which add features to the 4010. These include three MC or MM inputs with user settable cartridge load resistance and gain for each channel, a Left-Right cartridge output Balance control with a front-panel meter and a built-in headphone amplifier. Take a look at the data sheeet and user guide by clicking here.

8 October 2009
Introducing our NEW model 411 Measurement Microphone Preamplifier for making sound measurements using our model 817A or 818 mic or balanced mics such as the Behringer ECM-8000 or Dayton EMM-6. The 411 supplies both +5 and +48 phantom voltages although both mic inputs cannot be used at the same time. Very low noise floor, wide dynamic range. Take a look at the specs and User Guide by clicking here.

28 August 2009
We have reintroduced our model 4041 Battery/Mains powered Stereo Phono Preamp (for MM and MC cartridges). The redesigned power supply allows using 8.4V (9V size) NiCd or NiMH batteries. NiCd batteries are becoming difficult to find but NiMH are now quit available. Battery replacement is easy -- just snap out and snap in the new ones. Take a look at the specs and User Guide by clicking here.

3 March 2009
NEW PRODUCT: Our model 603A Tuneable Stereo Rumble Filter. It is tunable in 5 Hz steps from 15 to 65 Hz and it's a very low noise, low distortion design. It is housed in a cast aluminum enclosure and all the input and output connectors are on the rear panel for easy system integration. Take a look at the specs and User Guide by clicking here.