The value of the model 19 depends upon a few things:
1.Country of origin
Early production runs were done in the USA and they had many problems, the later runs of the better quality units were done in Japan.
2.Scope operation
Does this work properly, as the tube is rare and expensive.
3.Overall cosmetics
Good, kleen shape?
4.Functionality
Do all of the features work?
SUMMARY
If the unit was built in Japan, and is kleen and functioning it is worth about $500(retail value). The Marantz stereo receiver that is really valuable are the models 2500& 2600, these go for between $3K-5K in good operating condition.
Hope that helps.
Just my $0.02....
