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M400 noise

M400 noise

2008-07-27 by Hessel Herder

Hi guys,

My M400 # 126 has been behaving somewhat strange the last couple of days;

After the warmup ( she still has a CMC 4 card,runs pretty stable ),she'll play fine,no probs.Sometimes,however,after some time,there'll be a 'fade out' of direct signal and at the same time a 'fade in' of noise.The direct sound remains at low level,the noise at high level.Any idea hat could cause this?A preamp issue or something with the output stage?

The machine has been restored recently, a great job,also fixed the headblock to preamp lead issue,which I believe is one of the possible reasons for the behaviour mentioned above.

The only thing I can think of is that it maybe has something to do with my swell pedal,had that refitted with a new pot recently.

Any ideas?

Cheers,H

Re: [newmellotrongroup] M400 noise

2008-07-28 by lsf5275@aol.com

In a message dated 7/27/2008 3:12:15 P.M. Eastern Daylight Time, hessel@soundscape.nl writes:
The only thing I can think of is that it maybe has something to do with my swell pedal,had that refitted with a new pot recently.
Try unplugging the swell pedal. Please report back after doing so.
Frank



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RE: [newmellotrongroup] M400 noise

2008-07-28 by Hessel Herder

I’ll try that

From: newmellotrongroup@yahoogroups.com [mailto:newmellotrongroup@yahoogroups.com] On Behalf Of lsf5275@aol.com
Sent: maandag 28 juli 2008 6:17
To: newmellotrongroup@yahoogroups.com
Subject: Re: [newmellotrongroup] M400 noise

In a message dated 7/27/2008 3:12:15 P.M. Eastern Daylight Time, hessel@soundscape.nl writes:

The only thing I can think of is that it maybe has something to do with my swell pedal,had that refitted with a new pot recently.

Try unplugging the swell pedal. Please report back after doing so.

Frank



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Re: [newmellotrongroup] M400 noise

2008-07-28 by lsf5275@aol.com

In a message dated 7/27/2008 3:12:15 P.M. Eastern Daylight Time, hessel@soundscape.nl writes:
My M400 # 126 has been behaving somewhat strange the last couple of days;

After the warmup ( she still has a CMC 4 card,runs pretty stable ),she'll play fine,no probs.Sometimes, however,after some time,there'll be a 'fade out' of direct signal and at the same time a 'fade in' of noise.The direct sound remains at low level,the noise at high level.Any idea hat could cause this?A preamp issue or something with the output stage?

The machine has been restored recently, a great job,also fixed the headblock to preamp lead issue,which I believe is one of the possible reasons for the behaviour mentioned above.

The only thing I can think of is that it maybe has something to do with my swell pedal,had that refitted with a new pot recently.

Any ideas?

Cheers,H
In all seriousness, you might want to check the PAL connecter that plugs into the preamp to make sure you the shield and center wire are making proper contact.



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RE: [newmellotrongroup] M400 noise

2008-07-28 by Hessel Herder

With the machine on?

-----Oorspronkelijk bericht -----
Van: lsf5275@aol.com
Aan: newmellotrongroup@yahoogroups.com
Verzonden: 28-7-08 16:11
Onderwerp: Re: [newmellotrongroup] M400 noise


In a message dated 7/27/2008 3:12:15 P.M. Eastern Daylight Time,
hessel@soundscape.nl writes:

My M400 # 126 has been behaving somewhat strange the last couple of days;

After the warmup ( she still has a CMC 4 card,runs pretty stable ),she'll
play fine,no probs.Sometimes,After the warmup ( she still has a CMC 4 card,runs
pretty stable ),she'll play fine,no probs.Sometimes,<WBR>however,after some
time,there'll be a 'fade out' of direct signal and at the same time a 'fade
in' of noise.The direct sound remains at low le

The machine has been restored recently, a great job,also fixed the headblock
to preamp lead issue,which I believe is one of the possible reasons for the
behaviour mentioned above.

The only thing I can think of is that it maybe has something to do with my
swell pedal,had that refitted with a new pot recently.

Any ideas?

Cheers,H




In all seriousness, you might want to check the PAL connecter that plugs
into the preamp to make sure you the shield and center wire are making proper
contact.



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FanHouse Fantasy Football today.
(http://www.fanhouse.com/fantasyaffair?ncid=aolspr00050000000020)

Re: [newmellotrongroup] M400 noise

2008-07-29 by lsf5275@aol.com

In a message dated 7/28/2008 1:52:11 P.M. Eastern Daylight Time, hessel@soundscape.nl writes:
With the machine on?
Please do it with the machine off. Wiggling wires is not usually a good idea when it is hot. The other way to check is with an ohm meter. Unplug the head block and connect one lead to the connector center pin and the other end on the center wire where it is soldered to the tape heads. You should get a null reading. Wiggle the wire and check again. Same thing with the sleeve. If you get anything else, your connection is bad.
Frank



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RE: [newmellotrongroup] M400 noise

2008-07-30 by Hessel Herder

Thanx Frank

I’ve isolated the problem ,it’s gotta be the pedal.I ran the machine yesterday without it and it behaved great, no audio drops.

Do you know if the pedal can cause some kind of short or feedback that results in the level drop / noise increase?

Mind that, when when the problem occurs, and I disconnect the pedal, thye machine stays at low level / high noise.

H

From: newmellotrongroup@yahoogroups.com [mailto:newmellotrongroup@yahoogroups.com] On Behalf Of lsf5275@aol.com
Sent: dinsdag 29 juli 2008 23:02
To: newmellotrongroup@yahoogroups.com
Subject: Re: [newmellotrongroup] M400 noise

In a message dated 7/28/2008 1:52:11 P.M. Eastern Daylight Time, hessel@soundscape.nl writes:

With the machine on?

Please do it with the machine off. Wiggling wires is not usually a good idea when it is hot. The other way to check is with an ohm meter. Unplug the head block and connect one lead to the connector center pin and the other end on the center wire where it is soldered to the tape heads. You should get a null reading. Wiggle the wire and check again. Same thing with the sleeve. If you get anything else, your connection is bad.

Frank



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