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How the Model 10B Differs from the Model 10
The Model 10b uses gapped pot cores cores for the IF stage inductors. Marantz found that the the toroid cores used in the model 10 were becoming magnetized on the production line due to the use of Weller soldering equipment (these use a temperature-sensitive magnetic tip to control the applied heat energy.)
When the magnitization occurred, the tuners could not be aligned, and this required a costly re-work of the model 10 tuner prior to shipment, hencce the change for the 10B production run.
The dial mechanism was also redesigned from the model 10 for the 10B production run.
In the 10B, the IF stages were aligned in an oven. Marantz engineering knew that the chassis would run at a certain temperature, so they designed a setup which would keep the IF strip at the correct temperature for alignment, thus ensuring that once the tuner reached its normal operating temperature, it would be completely "peaked".
Year: 1962–1966  Type: Radio - or past WW2 tuner 
Valves / Tubes 22: EC88 6DZ4 6JK6 12AX7 6U8 12AU7 DG7-32 
Semiconductors (the count is only for transistors) 1: 
Principle Superhet with RF-stage 
Wave bands FM Radio only 
Details 
Power type and voltage Alternating Current supply (AC) 
Loudspeaker - For headphones or amp. 
Power out 
from Radiomuseum.org Model: Stereo FM Tuner 10B - Marantz; Itasca
Material Wooden case 
Shape Book-shelf unit. 
Notes Tuner with CRT display. 
Net weight (2.2 lb = 1 kg) 15 kg / 33 lb 0.6 oz (33.04 lb) 
Price in first year of sale US$ 650.00