TES Milano D 566 B Distortion Meter - Page 1
Forum section: electronics / testgear

author: home_listening
author_rank: Contributor
timestamp: November 15, 2016, 11:13:45 am
content: Hi,I was given this old distortion meter recently, Electrolytics date it to 1973, and was wondering if anyone had a manual/service manual/any info on the company?Main oscillator connects to a fairly large air-core variable capacitor, the whole thing is fairly big - roughly 4 rack units in height. Very well made. The action on the vernier for the frequency control is unbelievably nice to use.A sticker on the front panel indicates it was supplied by Jacoby Mitchell LTD. of Nth Rocks in Sydney. Makes sense, this unit was apparently taken home from RMIT a few years ago when they were getting rid of old equipment.It was DOA when I got my hands on it. I already am capable of better distortion analysis but would love to get this working nonetheless.Any help is greatly appreciated!

author: picburner
author_rank: Frequent Contributor
timestamp: November 15, 2016, 07:03:20 pm
content: TES, Tecnica Elettronica System, was a old Italian brand based in Milan Via Moscova 40/7 but no longer exists now.You can see some products here:http://www.radiomuseum.org/m/tes_i_en_1.htmlI think it's very difficult to find a service manual now.

author: JPortici
author_rank: Super Contributor
timestamp: November 15, 2016, 07:22:36 pm
content: knowing how we usually are, if you manage to get in contact with somebody who worked there you will get EVERYTHINGalongside a good talki'll try and ask to some gurus in a facebook group..

author: richnormand
author_rank: Unknown
timestamp: November 15, 2016, 07:55:28 pm
content: Quote from: picburner on November 15, 2016, 07:03:20 pmWhen I look at my HP 332A distortion analyser your unit looks very similar. The meter, ranges, balance and main sensitivity selector are almost identical. The only difference is the main frequency dial (which is also a large air variable capacitor). Although the controls position are different the functions and ranges are almost identical too.If you cannot come across the proper user and service manuals I would suggest you get the ones for the HP. It might be quite similar on the insides also.Best of luck with it, looks like a nice instrument overall.

author: tronde
author_rank: Frequent Contributor
timestamp: November 15, 2016, 08:06:01 pm
content: I have user manual and schematics for this.Will scan later tonight.

author: tronde
author_rank: Frequent Contributor
timestamp: November 15, 2016, 09:09:57 pm
content: User manual and schematics.I remember some kind of a spring (type like safety pin) that broke. Attached to a rotary switch or potmeter I think. Used to activate a micro switch. Don't remember the fault sympthom for this.

author: home_listening
author_rank: Contributor
timestamp: November 17, 2016, 01:16:43 am
content: Thank you very much!Yeah, that microswitch (looks like a reed style) is indeed disconnected from the front panel rotary switch.I'll snap some more images and write something up about the repair once I get to it.Thanks again

author: keland_uk
author_rank: Contributor
timestamp: November 19, 2021, 03:08:29 pm
content: I am looking for a manual and scematic for a Tecnica Elettronica System (TES) MC-661F. Lots of info on C, D's and E's.I can't find anything on the F.Much appreciated if someone from Italy or anyware else has a copy :-)