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Marantz 10B noise

86.206.72.14
Posted on June 7, 2007 at 05:47:09
paul-emile
Audiophile

Posts: 56
Location: cote d'azur
Joined: June 1, 2007
 This is a question to Marantz 10 B owners . I am in europe and my 10 B is working fine (after i wired it on 230 V and change the 75 microS filter to 50 microS) but i have a noise only on one broadcast, it is not hum i did not look it on a scope but i think it is a 500 Hz square wave form signal. This noise stop when i switch to mono mode and once more it is only on one station reputed for high quality, wide music bandwidth and high stereo separation. Does someone related the same thing ?

 

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RE: Marantz 10B noise, posted on June 7, 2007 at 16:13:26
zako
Audiophile

Posts: 935
Location: Mo.
Joined: March 29, 2004
 It could be the station is having problems....Have you contacted them?

 

RE: Marantz 10B noise, posted on June 7, 2007 at 19:53:59
onemug
Audiophile

Posts: 1276
Location: So. California
Joined: April 19, 2003
 I may butcher this a little, but a 10b guru told me that it has quite a wideband and some stations broadcast something along with their normal signal way out on the edge and this could be a problem for a 10b. An average tuner probably wouldn't pick this up and some super tuners have a wide/narrow filter switch that would take care of it. Alas the 10b has no switch for this. Have you tried a cheap tuner? What does the multipath trace look like when on this station? I'll go back to cutting meat now.

 

RE: Marantz 10B noise, posted on June 8, 2007 at 02:34:25
paul-emile
Audiophile

Posts: 56
Location: cote d'azur
Joined: June 1, 2007
 Hi,

Thanks for reply, i have another tuner but is not really cheaper, it is a Mc intosh MR 71 ! no problems with it on this station but i have an external roof antenna with a 75 ohms cable. The 10 B have a balanced 300 ohms antenna input and i did not find at this time a 300 ohms shielded cable for a good antenna, the high sensitivity of this tuner make a good result even with a small inside dipole. I will take the time to make a tuned "balun" on this station ( 100 MHz) to match the roof antenna to the 10 B input . The multipath scope is not showing very bad reception on this noisy station : the spot is 7 mm wide above the center and have not a wave form .
Regards,
paul-emile

 

RE: Marantz 10B noise, posted on June 8, 2007 at 02:52:55
paul-emile
Audiophile

Posts: 56
Location: cote d'azur
Joined: June 1, 2007
 Hi,

The station is "France Musique" and is reputed for the broadcast quality. I read they changed something but i don't remenber exactly, i will go on the web site .

Regards,

Paul-emile

 

RE: Marantz 10B noise, posted on June 8, 2007 at 04:29:54
stellavox


 
I had a 10B that was "squealing" - turned out to be a tube in the multiplex section (don't remember which) - probably wasn't fully locking onto the pilot signal.

Rather than testing them, I find it's better (and quicker) to substitute known good tubes one at a time.

 

RE: Marantz 10B noise, posted on June 8, 2007 at 06:49:08
onemug
Audiophile

Posts: 1276
Location: So. California
Joined: April 19, 2003
 You're doing a good job of problem solving. The 71 is a great tuner. I don't think it's as wideband as the 10b. On "tuning" the balun, you might experiment with de-tuning it a little for the 100mhz station. Good luck.

 

RE: Marantz 10B noise, posted on June 8, 2007 at 13:11:04
paul-emile
Audiophile

Posts: 56
Location: cote d'azur
Joined: June 1, 2007
 Hi,

Thank you for the info, i'll remove the tubes of multiplex, test or replace, these are 12AU7 and 6BU8 of memory, no problem to find , not the same with 6JK6 !

Paul-emile

 

RE: Marantz 10B noise, posted on March 27, 2017 at 11:21:33
6bq5
Audiophile

Posts: 4393
Location: SF Bay
Joined: August 16, 2001
 Given that the problem went away when you switched to MONO-
The problem is in the MPX circuit- tubes are always the first culprit....
Happy Listening

 

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