There are 2 kinds of goo. One the factory put on. Dont
remember which sets but several brands had it. When
the sets got older it turned into a filthy mess that we
cleaned off & didnt replace. Other sets had aftermarket goo.
They came from houses that had a lot of greasy cooking.
Covers everything in the HV. You can tell a lot from
the crap on a chassis. Example a thin white coating is
from a humidifier. A thick white powder is talc & the set
is a bedroom set. Can also tell cat or dog, wood stove,
smoker etc. A nice thing abt SS sets is the chassii
were always cleaner. Some tube jobs had inches of crud that
we took out side to blow out.
And yes 1970's Zenith delta jugs without question were
the best. But in-lines get a bad rap because the delta were so good.
More failures but they came in short runs. Example we saw
many M1970P with bad tubes at 3 yrs but they all came from
one batch of 12 we sold. A call to Zenith got a free tube IF
we agreed to not charge labor. Needless to say we only did
that for "our" sets...
The 90's were different. Those jugs were pure junk.
Zenith did extend them up to 5 yrs. The higher end the set
was the longer they extended it.
73 Zeno
73 Zeno