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 (April 2008).

6 January 2008
We have finally given away all 100 sets of our CDs of restored 1950s pop music. As promised, we did not keep any names or addresses but we did keep a tally of requests by state and country. If you are interested in this kind of trivia, just click here.

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.

22 December 2006
I have a great interest in servo subwoofers because it's a excellent way to achieve low frequency bass from a fairly small enclosure. Bill Waslo published an article in the December 2006 issue of AudioXpress Magazine in which he describes a servo modification to either the Dayton Sub-100 or Sub-120 subwoofer, and a conversion kit is available from Old Colony Sound Lab. In the interest of "advertising" this product, I am making a zip file available which contains the original AudioXpress article and all the kit building instructions including color photos. Just click here to download it. (Sorry, the file is a bit large, about 15 MB.)

27 October 2006
Last evening I was listening to a CD of carillon music I restored a couple of years ago from a 1950s promotional LP from Schulmerich Carillons. It occurred to me what a great test CD this is for your whole sound system and especially for your speakers. Bell music has a very fast attack time so it provides a good transient response check. The sound should be very crisp with no "hangover." I was listening using a pair of our TSMD-2s with our model 912 subwoofer and sound was excellent -- the arrays of 3 inch drivers reproduce the transients very well. I will send a FREE copy of this CD to the first 10 people who request it by email, phone, FAX or snail mail. I mean absolutely free; you won't get any advertising and you will never hear from us again unless you make the contact.

24 October 2006
We have added two new pages to our list of Resources: Musical History and Music Venues (which is devoted to the unusual). Please click here to take a look.

23 September 2006
Our model 444A Stereo Headphone Amplifier is now available. Please click here for more info. You can also find the model 444A in Products | Preamps & Misc.

24 August 2006
We are pleased to finally announce our new model 465, 6-Channel Volume Controller. Please click here for more info. You can also find the model 465 in Products | Preamps & Misc.

5 June 2006
The April issue of AudioXpress magazine contains an article on a minimalist class A power amp by Ed Simon. I have built this amp twice: first, according to the article and then in a modified form. Please click here to download my extensive notes, (simon.zip, size about 460 kB). Or click here to jump to the Power Amplifier page.

28 March 2006
The February 2006 issue of AudioXpress magazine features an article by Dennis Colin: "The Sound Strobe." This instrument lets you evaluate 'speaker performance and diagnose problems by simply listening to your sound system. The Sound Strobe is NOT available from TDL® but it is available from Old Colony Sound Lab. Please click here for more information.

9 February 2006
Our NEW model 912 Dual Voice Coil Servo Subwoofer System. Please click here for more info.

13 January 2006
Here now, our model 414 Stereo Utility Amplifier. Please click here for more information.

3 December 2005
We have completely rewritten the Audio Restoration pages. Each topic is now in an individual chapter and can be read on-screen or downloaded as an Adobe Acrobat (pdf) file. Updates and additions are being made every few days. We are also adding Case Studies on specific restoration projects. Case Studies 1, 2 and 4 are online and number 3 is in process. Please click here to take a look.

2 August 2005
Click here to download the Sounds of the 1950's playlist. It's an Adobe Acrobat pdf file, size about 56 kB.