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Marantz 10b no reception above 99.4

E

E.C. Gates

New Member
Friendly browser/lurker here, looking for advice. I inherited a Marantz 10b a few years ago, and listened to it from time to time, with months in between. I seldom, maybe never, strayed from the local classical and jazz stations, all at the extreme left side of the dial. This time, though, when I ventured further, I found that it won't bring in anything -- no static, no nothing -- on the right half of the dial, beyond 99.4. Based on a thread on this forum from a few years ago, I replaced the two 6DL4 tubes. The signal was much better -- but still nothing above 99.4.
Any expert ideas? All appreciated. Thanks.
 
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The 10b uses a 6DZ4 oscillator tube and if the trouble is no reception above a certain frequency, the oscillator is the most likely culprit. The mixer diode bridge is a fairly heavy load and an old tube may be a problem.
 
Yes, try replacing that 6DZ4 oscillator tube. A weak one will foul up reception above a certain frequency. That mixer diode bridge is indeed a heavy load and an old tube is enough to cause issues.
 
amptramp said:
The 10b uses a 6DZ4 oscillator tube and if the trouble is no reception above a certain frequency, the oscillator is the most likely culprit. The mixer diode bridge is a fairly heavy load and an old tube may be a problem.
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Most helpful. Thanks. I'll do that right away.
 
If you have stereo light switching problems the metal can optical switches can be rebuilt with Radio shack photo cells if available,
 
I got curious and had to look at the print for that thing after the mention of the diode mixer.

WOW. To think that came out in 1966. I would like to see pictures. How many sections in that tuning cap ? And they have a 38 KHz oscillator. Not a PLL from what I see but probably more phase stable than a simple doubler which might be susceptible to noise in the signal.

They could have had a real PLL, they existed - in color TVs.

Some nudies would be nice, but I bet that tuning cap is under a shield. That has to come off for the photoshoot.
 
This tuner was released in 1964. And the costs incurred with this tuner sank the Marantz Company and forced the sale to SuperScope in 1964, Marantz lost money on every 10b sold.
 
KentTeffeteller said:
This tuner was released in 1964. And the costs incurred with this tuner sank the Marantz Company and forced the sale to SuperScope in 1964, Marantz lost money on every 10b sold.
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Kent,
It was the Model 10. Production issues caused the scope to require costly readjustment after manufacture. The 10B 'resolved' the issues. The cost to Marantz was very high.
True, the 10B was a loosing venture at first.
 
The 10 was a very costly venture. And really, the losses sustained on them did almost sink Marantz, and the fact that the tuner was sold for too little money (being costly to build) Saul and Sid got over their heads a bit much. I bet the 10B made little profit for Superscope.
 
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