Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net

   Home   Help Search  
Pages: [1]   Go Down
  Print  
Author Topic: Matching impedance to grids with multi-tap driver transformer  (Read 3299 times)
K1YTG
Member

Posts: 206




Ignore
« on: November 18, 2012, 12:07:49 PM »

I have a line to p-p grids transformer.  But no chart for the connections. 
Is there an in circuit way to try the different taps and measure which one gives the best match?
I have been thinking that the best match would be the one that delivers the most power the the grids.
So if I watch the output of the driven tubes (100th in this case),  the connections that give the most output would be the best match.
Or do I need to measure the grid current and the most grid current would be the best match?
Or is this all wrong?  Perhaps what I need to be looking for is lowest distortion.  I could watch the output on a scope and match for lowest distortion.
But I am not sure I could see the distortion on the scope.  Would I see any difference on the different taps? 
Thanks for assistance ,  Norm
Logged
AC5UP
Member

Posts: 3837




Ignore
« Reply #1 on: November 18, 2012, 02:02:00 PM »

If the transformer has any markings as to manufacturer or model number it might be possible to find the application data on the web. There are web sites with vintage catalogs from Thordarson, Stancor, United, Chicago Transformer and others.

I had a mystery transformer with only a model number that I was able to trace back to Stancor by looking at the page indexes of catalogs  HERE  and  HERE.

Some of the old catalogs also include application notes, sample circuits and tips for selection and use of their products which could be useful even if you don't find the exact part. There is some consistency in color codes and pinouts within transformer types across manufacturers.
Logged

Never change a password on a Friday                
Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!