UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Test Gear and Workshop Equipment

Notices

Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders.

Reply
 
Thread Tools
Old 12th Nov 2019, 7:57 pm   #21
buggies
Hexode
 
buggies's Avatar
 
Join Date: Jan 2009
Location: West Lothian, UK.
Posts: 373
Default Re: What is it?

No datasheet but this site says 30V

http://www.chipdocs.com/datasheets/d.../BZY95C10.html

Z2A30 30V, 1.5Wt General purpose voltage reference/regulator diode Operational temperature range from 0C to 175C.
__________________
George
buggies is online now   Reply With Quote
Old 12th Nov 2019, 7:59 pm   #22
Skywave
Dekatron
 
Skywave's Avatar
 
Join Date: Jun 2006
Location: Chard, South Somerset, UK.
Posts: 6,476
Arrow Re: What is it?

Data from "Radio Valve and Semiconductor Data", Illife, 8th. ed.

STC Zener diodes.
Z2A33CF = 3.3 v. Zener, 5%, 1 watt.
Format: Z2AxyCF = x.y v. Zener
And so on for others in the range, up to:
Z2A300CF = 30.0 v. Zener, 5%, 1 watt.

So on that basis, your Z2A30CF is a 3.0 v Zener diode, 5%, 1 watt

HTH,

Al.
__________________
Never act on your first idea. Like solving a crossword clue, a better idea arrives tomorrow.
Skywave is offline   Reply With Quote
Old 12th Nov 2019, 8:06 pm   #23
buggies
Hexode
 
buggies's Avatar
 
Join Date: Jan 2009
Location: West Lothian, UK.
Posts: 373
Default Re: What is it?

Quote:
Originally Posted by Skywave View Post
Data from "Radio Valve and Semiconductor Data", Illife, 8th. ed.

So on that basis, your Z2A30CF is a 3.0 v Zener diode, 5%, 1 watt
Agree - much more likely than the site I found - especially in battery equipment.
__________________
George
buggies is online now   Reply With Quote
Old 12th Nov 2019, 9:02 pm   #24
merlinmaxwell
Dekatron
 
merlinmaxwell's Avatar
 
Join Date: Jul 2008
Location: Maidenhead, Berkshire, UK.
Posts: 8,458
Default Re: What is it?

Quote:
I wish I could find some documentation but I doubt that the calibration house that lists this device would be willing to share....
One can but ask, you never know.
__________________
Cats have staff, it's dogs that have owners.
merlinmaxwell is offline   Reply With Quote
Old 12th Nov 2019, 9:11 pm   #25
WaveyDipole
Octode
 
WaveyDipole's Avatar
 
Join Date: Mar 2013
Location: Leicester, UK
Posts: 1,641
Default Re: What is it?

Thanks gents for the data on the Z2A30CF.

There is no decimal point between the 3 and 0. The maximum battery voltage is nominally 7.5v - a little over 8v in practice with fresh batteries, so the data from "Radio Valve and Semiconductor Data", Illife, 8th. ed. indicating a 3.0v zenner would seem to make more sense than the 30v on chipdocs. So another piece of the puzzle put in place.

Either way though, the measurement I got across it of 1.1248v does not seem to make sense, unless it is a voltage clamping diode. Will maybe know more when I draw out the circuit.

Quote:
Originally Posted by merlinmaxwell View Post
Quote:
I wish I could find some documentation but I doubt that the calibration house that lists this device would be willing to share....
One can but ask, you never know.
Indeed I did ask today, but no luck unfortunately.
Attached Thumbnails
Click image for larger version

Name:	Z2A30CF.jpg
Views:	9
Size:	18.4 KB
ID:	193641  

Last edited by WaveyDipole; 12th Nov 2019 at 9:26 pm.
WaveyDipole is offline   Reply With Quote
Old Yesterday, 11:40 pm   #26
knobtwiddler
Triode
 
Join Date: Mar 2016
Location: London, UK.
Posts: 13
Default Re: What is it?

Quote:
Originally Posted by WaveyDipole View Post
Right-clicking download next to Datasheet (jpg) and 'Save Link As' did the trick for me. That's one piece of useful information returned. Thank you for finding and posing that link.

Looks like the company that made the meter movements, Sifam, is still around, although perhaps no longer in the UK.
Sifam famously supplied the meters for the BBC-certified PPM meters that Canford sold. They used to have a good line of MC meters until the firm got sold a few years back. The PPM-spec meters got discontinued (Canford had some NOS when I last looked) and the rest of the range got moved to 'offshore' production. These new meters are sold by Canford with the disclaimer that they do not meet the IEC ballistic spec for a VU meter, I.e. they will flap around and look nice in your piece of hipster audio, but aren't accurate. From my extensive research I can say that there are probably less than a handful of firms worldwide now who are capable of making the kind of meter movements that were commonplace 50 years ago. If anyone cares to disagree with this sentiment I'd be delighted!
knobtwiddler is online now   Reply With Quote
Reply

Thread Tools



All times are GMT +1. The time now is 12:05 am.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Copyright ©2002 - 2019, Paul Stenning.