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Marantz 18 scope

darbacox

darbacox

Member
Hi,
I have a trouble with my scope.I have changed my transformer and my scope tube (NOS). My 18 work fine but the scope light is very small .
On my model 19 , the green color tube is large !!

Do you understand ? you can check video on you tube of my trouble

Same scope on my model :
https://www.youtube.com/watch?v=Oew0QWJHylg

The normal scope on the 18 :
https://www.youtube.com/watch?v=1PYNqGBBRtQ


If you can help me .. I don't know why !
 
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Check all capacitors in HT circuit for electrical leakage, all resistors for true measured value against ratings.

Sent from my SM-N900V using Tapatalk
 
Are you sure ? Because on youtube the guy has changed his scope tube on his 18. And the result is the same of mine !
 
That's lack of stereo separation vs a tube or circuit issue. Try adjusting separation , should be listed in the SM.

This is in FM? Cause if it's aux or phono there is very little that can be adjusted on the scope tube, it's the way they are.
 
Looks like some voltages around the tube are off. There should be intensity and focus controls somewhere. See if they have any affect.
Also be sure that a mono/stereo selector hasn't been unintentionally toggled.
Sent from my SM-N900V using Tapatalk
 
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I need the 2 transistors 34-1030 on your scope card .. or good instructions how to replace them by actual transistors.

Thanks for your help
 
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