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Marantz Model 10b Tuner

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Front View
Image Attribution: Freddy Sangild
Date: September 16th, 1999

Front View - Black rack mount - "Broadcast Version"?
EBay Auction #1304603204
Image Attribution: E-Bay seller ""
Date: December 1st, 2001

Top View
EBay Auction #288405181
Date: March 20th, 2000

Bottom View
EBay Auction #271394202
Image Attribution: Ebay Seller "taperec"
Date: March 1st, 2000

Philips CV2431 or Tungsram DG7-32 Scope Tube for 10B
EBay Auction #513622951
Date: November 29th, 2000

Owners Manual
EBay Auction #1202552882
Date: December 17th, 2000

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".

Contributed by Ben Blish
On March 1st, 2000


Retail Price650
Resale Value1500
Designed inUSA
Manufactured InUSA
First Year1964
Last Year1970
Quantity Manufactured5,500 -- this is virtually certain. If you have ser # higher than 5,500, please contact me.
Wood CaseWC-1U
Tube DesignYes

Panel Width15 3/8
Panel Height5 3/4
Width14 3/8
Weight38 lbs (shipping)

FM Tuner
Gyro TuningNo
RF Sensitivity2.0 uV
300 Ohm Binding PostsYes
50 dB quieting sensitivity, Mono3.0 uV
Ultimate Quieting70 dB
THD, Mono0.20%
IF Bandwidth(s)200 khz
Alternate Channel Selectivity (wide or normal)150 db
Adjacent Channel Selectivity (Wide or Normal)042 db
Spurious Rejection100 db
AM Carrier Rejection70 db at 80% modulation
Stereo Separation at 1 kHz45 dB
Mono SwitchYes
Multiplex Filter (Hi-Blend)Yes
Stereo LampYes
FM Mode LampPanel Dimmer
Muting SwitchYes
Scope TubeTungsram DG7/32
Scope External Audio Display CapabilityYes
Scope Internal Audfio Display CapabilityYes
Scope Tuning IndicationYes
Scope Multipath IndicationYes

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