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.

4 April 2009
We have a new phone number: 575-405-7996.
This number has voice mail so you can leave us a message. It should be available 24/7.
We may or may not be answering 575-382-3173 so please use the new number. (It may take a while to change it in all our web pages so please be patient.)
We now receive very few FAX messages so we are discontinuing that number. If you want to send a FAX, please send a FAX image to one of our email addresses.

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.

11 December 2008
I found this class A power amp design by Bruce Heran on the web. It is a minimalist design which always interests me so I built one. Excellent sound! The zip file contains my notes and a whole lot more, including a SPICE simulation file. Click here to take a look (it's # 10 in the list).

6 December 2008
We have had several inquiries lately about how to find product prices. The easiest way is to click on PayPal -- Buy Now on the Home page. You can also access the price list from the How To Order Main Menu Bar. In addition, each product data sheet has a link to the PRICE LIST at the bottom of the page. It certainly was NOT our intention to make the price list hard to find!

25 January 2008
HERE NOW! Our NEW "The Restoration Preamp"^TM (model 4010). This preamp is for restoring cylinders, vertical cut recordings, 78s, 45s and early LPs. The MODE switch selects: LEFT, RIGHT, L+R, L-R or LR BLEND. The TURNOVER and ROLLOFF frequency switches each have eleven choices (including FLAT). Maximum gain is selectable as 52, 56 or 60 dB. Includes a four-frequency rumble filter (with bypass), volume control and an output lowpass filter with a choice of eleven cutoff frequencies. The enclosure is a 2RU rack mount (3.5 inches high). Please click here to take a look at the full spec sheet.
Click here to read a customer review of the 4010 as published in the April 2009 issue of audioXpress magazine (size about 4.2 MB).

15 December 2007
We have completely revised Chapter 7 (Audio Cleanup Software) on our Audio Restoration page. All version numbers, prices and availability are now current as of this date. We have also made each product a separate page to make it easier for you to look at a particular item -- just click on it in the Chapter 7 home page. To take a look, just click here.

2 July 2007
We've added a training video review to DC Six (#16) in our Audio Restoration Chapter 7 and some more comments on Disc Welder Bronze in Chapter 9. Please click here to take a look.

16 May 2007
I have found a rather impressive and inexpensive sound file "scrubber" named Mono-A-Mono. It is available from the author, Steve Beet, as a download from his website. I have evaluated it and you can read my comments by clicking here. It is item number 7 in the list.

24 April 2007
Ed Simon has written and excellent and informative review of The Sound Strobe TM loudspeaker test box which was published in the April 2007 issue of AudioXpress. This is NOT a TDL® product but we have put a link to the review (in pdf format) on the Sound Strobe page. Please click here.