Green Scope/Blue Scope

S

Stereofan

Active Member
Hello everybody,
I own a beautiful Marantz 150 tuner with a green scope. It is in perfect operational and cosmetic condition with no "burn-in" and is typical of the early "Sun Valley" 150's. Others have the blue scope that are typical of the later "Chatsworth" 150's. However if I had a choice, and was able to buy one new, I would have preferred one with the blue scope.
A very good friend who has extensive experience in owning and repairing 1970's era Marantz equipment, and who owns a blue scope 150, explained to me that all the scopes were green but what made the difference was a blue gel material in front of the scope tube.
I'm considering turning my scope from green to blue so my question would be what is this "gel" made of, how is it installed, is it still available, and if so where?
Thanks in advance for your responses.
 
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I don't know for sure, but I think that the difference is due to the type of phospher used. I don't think a gel was involved.

DH
 
In pro stage lighting, a "Gel" is just a colored plastic lens, that is placed over the end of the can (lamp) to provide the required color. It is easy to change out the gels to get your desired colors where you want them in a bank of cans, the gels just slide into a frame and are held in with a clip (Usually)....

Maybe that is what they used?
 
I never check inside my 150, but in the 2110-2130-2500-2600 there is a blue filter between the glas and the scope.
The scope on those unit are blue/green



Tony
 
...the tubes all have the same green phosphor. The blue ones only have a blue color foil in front. For example the older 4400 had a green scope, the younger had a blue filter in front of the same crt. As birddog says, ask at a lighting company or your local rock/country band for a clip of blue color foil.

Helmut
 
I took the blue clear plastic off my 2500 and thought the looks improved. If I want it all original again, it is easy to put back.
 
Any theatrical lighting supply company can supply you with any shade of heat proof gel material you want. You will have many shades of blue to choose from. Gel comes in large sheets, or rolls. One manufacture is Roscoe, but there are others. You may even be able to order "on-line", but then you will be charged with shipping.

- augustwest
 
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