Tuning a Marantz Scope Tuner without a Scope Tube???

[Cut-Throat]

I have just purchased a Marantz 20 Tuner and it does have a working Scope Tube. But it seems the replacements are almost impossible to find. I was wondering if there was any way to tune in stations without using the Scope Tube. Other than 'By Ear'. I noticed some scope inputs on the back of the unit. I was wondering if there was any other way????

 

[dr*audio]

Just use the scope tube and don't worry about what happens if it goes bad. I suspect it can be rebuilt by the same folks who rebuild picture tubes and oscilloscope tubes. The only way to tune it without modifying it would be to tune it until the stereo lamp comes on and then by ear from there, or tune it to the mid point of where the stereo lamp just comes on in either direction. I think it is possible to replace the tube with an LCD display, if you could find an LCD display with it's own driver board and X and Y inputs.

 

[Marantz7t15]

Plug a regular osc. into your osc output jacks and swing your sweep/time knob to the channel A/B position. Typically all the way clockwise. This allow your external scope to beat channel A against channel B. Tune until you get a razor diagonal line. BOOM!

 

[jstang]

Sell it to me....

I think that tube is the same at the Model 19....and they come up on Ebay every now & then.... But I am not 100%.

Also, I thought the jacks were input jacks not output. And they are used to see audio signals on the scope. Which is how the scope jacks work on the 10b, as inputs. But I never owned a 20.

jk

 

[onemug]

When you find a station, observe where the dial pointer is when you off tune to the left and then off tune to the right. Center the pointer between those two points.

Practice with the scope on and you'll get it down. Your on your own as far as multipath/antenna orientation is concerned. That is where the scope is a huge benefit.