Forums :: Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives
Support This Site: Contributors :: Advertise


It is currently Jul Tue 14, 2020 11:53 pm


All times are UTC [ DST ]





Post New Topic Post Reply  [ 7 posts ] 
Author Message
 Post subject: Leader LDC 821S frequency counter
PostPosted: Mar Sun 29, 2020 2:04 pm 
New Member
User avatar

Joined: May Tue 04, 2010 10:09 pm
Posts: 9
Location: Wake Forest, NC
Picked up a “working” Leader frequency counter made in Japan.
Going to clean, recap and calibrate, which seems pretty straight forward but can’t seem to find a any reference of, schematic of, nor manual for this nice little Nixie tube gadget.
Tried all the normal places, here... bama... no joy.
If any has a copy or any suggestions it would be greatly appreciated and I’ll share it here & upload.
Thank you,
Russ KM4RHK


Attachments:
25911669-DA92-4FAF-B1B3-43ED90C07AAE.jpeg
25911669-DA92-4FAF-B1B3-43ED90C07AAE.jpeg [ 534.72 KiB | Viewed 367 times ]
Top
 Profile  
 
 Post subject: Re: Leader LDC 821S frequency counter
PostPosted: Mar Sun 29, 2020 2:10 pm 
Member

Joined: Nov Wed 30, 2016 7:35 pm
Posts: 7306
Location: Sunbury, Ohio 43074
I'd reconsider a "recap" before you see if it's actually working. Obviously replace any electrolytics that are visibly leaking or bulging, and perhaps any wax/paper caps if it has those, but otherwise ... see if it works before going on the warpath would be my suggestion. A lot of test equipment used much higher grade components than consumer stuff, and may work just fine without introducing a ton of extra variables should something be NOT working.

And I would absolutely not dive into the innards before locating a manual or at the very least, a schematic :)

my 2c. 8)

_________________
Preserving the hist. of electronics, one boat anchor at a time! :)
https://www.bbtvtestequipment.com


Top
 Profile  
 
 Post subject: Re: Leader LDC 821S frequency counter
PostPosted: Mar Sun 29, 2020 3:49 pm 
New Member
User avatar

Joined: May Tue 04, 2010 10:09 pm
Posts: 9
Location: Wake Forest, NC
You are probably right, I have dove right in the deep end before with less than stellar results. Thank you for that snippet of wisdom. Much appreciated.
R


Top
 Profile  
 
 Post subject: Re: Leader LDC 821S frequency counter
PostPosted: Mar Sun 29, 2020 6:21 pm 
New Member

Joined: Mar Sun 29, 2020 6:12 pm
Posts: 1
Greetings from Norway :-)

Hopefully my scan will be of help. I did change some electrolytic capacitors, the counter works fine - more for fun than use.


Attachments:
Leader LDC-821S.pdf [723.1 KiB]
Downloaded 39 times
Top
 Profile  
 
 Post subject: Re: Leader LDC 821S frequency counter
PostPosted: Mar Sun 29, 2020 10:00 pm 
New Member
User avatar

Joined: May Tue 04, 2010 10:09 pm
Posts: 9
Location: Wake Forest, NC
Norway Leads one to nothing.
Scan was good!
Thank you very much.


Top
 Profile  
 
 Post subject: Re: Leader LDC 821S frequency counter
PostPosted: Mar Sun 29, 2020 10:32 pm 
Member
User avatar

Joined: Oct Sun 15, 2006 12:57 pm
Posts: 7003
Location: Liberty, Missouri
Thank you rv2p800, looks like that counter uses some MECL logic elements in the signal conditioning circuit. Looks to be from the mid/late 70s. No oven, but it'll be easy to zero beat with WWV and at room temp it should be plenty good enough.

_________________
Pics, Bold & underlined text, are usually links.

https://mikeharrison.smugmug.com/

Mike


Top
 Profile  
 
 Post subject: Re: Leader LDC 821S frequency counter
PostPosted: Apr Thu 02, 2020 6:37 pm 
New Member

Joined: Dec Sat 21, 2019 7:36 pm
Posts: 3
Thanks very much for posting the manual. I found one of these on Ebay a few weeks ago after searching for a couple of years, but no luck on a manual or schematic. Luckily mine worked fine on arrival. It needed a new line cord and a good cleaning on the outside otherwise in great shape. My first counter years ago was a nixie tube type and I'd wanted to find one just to look at I guess.


Top
 Profile  
 
Post New Topic Post Reply  [ 7 posts ] 

All times are UTC [ DST ]


Who is online

Users browsing this forum: Als_Basement, J. Hill, PaulAm, paulL, pauls.ironhorse, ttx450cap and 10 guests



Search for:
Jump to:  


































-->


Privacy Policy :: Powered by phpBB