Videokarma.org

Go Back   Videokarma.org TV - Video - Vintage Television & Radio Forums > Diagnostic & Test Equipment

We appreciate your help

in keeping this site going.
Reply
 
Thread Tools Display Modes
  #1  
Old 06-05-2010, 10:46 PM
bandersen's Avatar
bandersen bandersen is offline
RCA 741PCS
 
Join Date: Mar 2009
Location: Chicago, IL
Posts: 8,085
EICO 369 Sweep / Marker Generator

I picked this EICO 369 sweep/marker generator recently. I was really happy to get the specialized cables with it. This device use post marker injection which is a better approach I think. That works by connecting the DEMOD probe to the output of the DUT, a marker is mixed in and the output goes to a scope.






The sweep is achieved by passing 60 Hz AC through this iron core thingy.


I replace one tube that had gone to air and did a recap.


It's working OK, but the output is distorted on the lower bands. I wonder if this is normal


I'm curious to see how it measures up to my Hickok 615.
__________________
Here are my Vintage Radio & TV YouTube Channel and Photo Gallery

Last edited by bandersen; 06-05-2010 at 10:50 PM.
Reply With Quote
  #2  
Old 06-20-2010, 11:54 AM
pugs5061 pugs5061 is offline
No time for this hobby
 
Join Date: Mar 2005
Location: Barrington, Illinois
Posts: 162
I bought one of these last night along with an older RCA Oscilloscope. I may have to recap and troubleshoot them. We will see. I hope my tubes get here soon for the TA129, I'm going to go broke hanging out on ebay! Actually I have less than $50 into both of them and so far and I have been pleasantly surprised in that everything I've bought works well and was better than expected. Knock on wood! Do you have a manual for the 369? If the one I bought doesn't I may ask if you can scan it. If not I will find one. I will try BAMA now.
__________________
The surefire way to make sure your CRT is dead, sell it to me!
Reply With Quote
  #3  
Old 06-20-2010, 11:57 AM
pugs5061 pugs5061 is offline
No time for this hobby
 
Join Date: Mar 2005
Location: Barrington, Illinois
Posts: 162
Found it! I love that site. 2 minutes later and the manual is on my computer and I'm posting a "never mind".
__________________
The surefire way to make sure your CRT is dead, sell it to me!
Reply With Quote
  #4  
Old 06-21-2010, 12:03 AM
bandersen's Avatar
bandersen bandersen is offline
RCA 741PCS
 
Join Date: Mar 2009
Location: Chicago, IL
Posts: 8,085
Quote:
Originally Posted by pugs5061 View Post
Found it! I love that site. 2 minutes later and the manual is on my computer and I'm posting a "never mind".
LOL - eBay can be a dangerous place.
I do have the original manual with somewhat different addendums at the back. They made a number of minor improvements to the design over time.

Did you get the probes with yours ? If not, you'll need to fabricate some with the proper termination.

It was fairly easy to recap since there's only one can to deal with. I hope you get yours running so we can compare outputs
__________________
Here are my Vintage Radio & TV YouTube Channel and Photo Gallery

Last edited by bandersen; 06-21-2010 at 12:30 AM.
Reply With Quote
  #5  
Old 06-21-2010, 01:43 AM
pugs5061 pugs5061 is offline
No time for this hobby
 
Join Date: Mar 2005
Location: Barrington, Illinois
Posts: 162
I was much more worried about the oscilloscope. Its a RCA WO 535A. He had a "BIN" on it for $120 so I assume its pretty decent. If not I only paid $11. Originally I was looking at later model Tektronics models and could of had some in the $50 to $75 range that I'm sure would work great and come with documentation. I decided to throw the die again. I have no idea what I am getting but for $11 It will take a little while to get it figured out if it doesn't come with probes and documentation. I've watched every video there is on youtube about oscilloscopes to see if I could figure it out just from a picture of the front of it and I think I can.
__________________
The surefire way to make sure your CRT is dead, sell it to me!
Reply With Quote
Audiokarma
  #6  
Old 06-21-2010, 01:55 AM
pugs5061 pugs5061 is offline
No time for this hobby
 
Join Date: Mar 2005
Location: Barrington, Illinois
Posts: 162
Forgot to answer the question about the signal generator. I don't know I think so. Ya gotta love ebay! For $9 again, I get what I get I've just been too lucky lately or as I've tried to post elsewhere Ebay is dying a slow death and I'm taking advantage of it or both. The economy has picked up a little but I can't sell things for half what I was getting a year ago so I have just about closed up shop. High quality high demand things will continue to sell wherever they are sold. An Oscilloscope and a signal generator do not have a high demand.
__________________
The surefire way to make sure your CRT is dead, sell it to me!
Reply With Quote
  #7  
Old 07-01-2010, 06:58 PM
pugs5061 pugs5061 is offline
No time for this hobby
 
Join Date: Mar 2005
Location: Barrington, Illinois
Posts: 162
Ok, an update to the above. The RCA Scope came last night with probes and working. The pots in the unit are a little shaky but nothing a little deoxit won't take care of. Very happy considering the cost. The Eico 369 was not as great a deal but I'm not complaining. It did not have any cables with it. I have a feeling I'm probably gonna have to rig something up. The unit itself is clean with only 1 bad tube. I am going to chance it with my existing capacitors until I see the signal. It looks as though it was built in 1968? I have plenty of items that old with original capacitors. Another 10 or 15 years older and it would be a no brainer the opposite direction. Have an opinion? Since Bob recapped his Also any ideas on cables would be appreciated.
__________________
The surefire way to make sure your CRT is dead, sell it to me!
Reply With Quote
  #8  
Old 07-01-2010, 08:54 PM
bandersen's Avatar
bandersen bandersen is offline
RCA 741PCS
 
Join Date: Mar 2009
Location: Chicago, IL
Posts: 8,085
I'm glad your scope is working

Once I replace the dead 6RD7, mine worked with the original caps. I recapped it mostly in the hope the output sine wave purity would improve, but it didn't.

I recently came across this thread which discusses modifications to improve performance. I also have some addendums with recommended modifications. I've ordered up some parts and will give them a try soon.

You will need to make up some cables. There are some passive components inside the pods at the ends of the original cables you should replicate. I think they show them in the documentation.
__________________
Here are my Vintage Radio & TV YouTube Channel and Photo Gallery
Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 10:51 AM.



Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
©Copyright 2012 VideoKarma.org, All rights reserved.