Problem with my Sony c800g

Je55 · 31st December 2006, 12:41 AM

I just got this new and after 5-10 mins of having turned the mic on, i get a faint hum (sounds like a ground hum) but the hum gets louder over the next ten minutes untill its a very loud square wave sounding hum.

Initially i thought it was a grounding problem with the power supply, but having noticed that the hum gets louder would lead me to think its a capacitor holding current? or a bad rectifier maybe something like that anyway.

When i turned off the power supply and turn it back on again, the buzz is completely gone.

either way, i called the retailer and they informed me that it would be hard to trade it out for a new one as sony have stopped production on the mic due to a rare metal or something and something else about homeland security not allowing this material into the country anymore. so they said they can have it fixed for no charge but i would have to go a week without my mic and i'm tracking every day.

my path is into avalon 737 > Neve 1073 > ad16x

but ive tried going straight into mini me and still get same noise so its not the chain.

ANYONE ELSE HAD THIS OR SEEN THIS?

Tony Shepperd · 31st December 2006, 01:41 AM

The 800G tube might be blown. It seems to be happening a lot lately.

Je55 · 31st December 2006, 01:49 AM

Thanks tony, is there a way to tell?

Tony Shepperd · 31st December 2006, 02:17 AM

I had my tech Dave Hecht open the mic up and check it out from top to bottom.
I can give you his number if you'd like.

PhilE · 31st December 2006, 03:20 AM

I had a similar problem in a couple of studios but not in others- seem really sensative to anything in the mains.

Igotsoul4u · 31st December 2006, 07:26 AM

I had the same problem with mine. Sent it backed to sony and they replaced the tube. Can't remember if it was free or not.

Je55 · 31st December 2006, 07:03 PM

Thanks for the replies guys. I really appreciate that.

I'm not really sure what im gonna do yet, ive been using it over the past couple days and it seems to be fine now so i dont know whats going on, i think when i get a space in my tracking schedule, i might send it off to be looked at anyway though.

also, as a side note...

I read an article on how the best match for the sony is the avalon 737 as it matched the impedence perfectly, ive been looking at getting the millenia, thats the reason i ask.

thanks guys,

Jesse

Je55 · 9th April 2007, 05:50 AM

Quote:

Originally Posted by PhilE

I had a similar problem in a couple of studios but not in others- seem really sensative to anything in the mains.

I know this is an old thread of mine but since I moved, I have the problem again.

Anyone know what may be the cause of this... I think your right in saying that its sensitive to mains at some places but not at others.

Volodia · 9th April 2007, 06:21 AM

Hi,

My tech moded my C800Gs . He said somehing about ground loop in the power supply .

Je55 · 9th April 2007, 06:48 AM

Quote:

Originally Posted by Volodia

Hi,

My tech moded my C800Gs . He said somehing about ground loop in the power supply .

Hi there, do you think you might be able to find out from him what he did please?

Volodia · 9th April 2007, 06:52 AM

In fact the audio ground is linked to the chassis which causes ground loops so he just cut it . there are other things he did that he wants to keep "secret" .

Je55 · 9th April 2007, 04:12 PM

Quote:

Originally Posted by Volodia

In fact the audio ground is linked to the chassis which causes ground loops so he just cut it . there are other things he did that he wants to keep "secret" .

Brilliant, I will try that today... Thank you for the images also!

how secret are these "secret hacks" lol ;) ????

Volodia · 9th April 2007, 04:20 PM

Hi,

He did other mods that he didn't specify ( did one out of two and wants me to test them ) .

Je55 · 9th April 2007, 06:26 PM

I cut the ground like your picture, and I have a session this afternoon so we will see if it works for me ;)

InsaneMixaken · 9th April 2007, 11:53 PM

I recently had the same problem I was told by Sony it could be the tube or a bad power supply.

Je55 · 10th April 2007, 07:05 AM

Quote:

Originally Posted by InsaneMixaken

I recently had the same problem I was told by Sony it could be the tube or a bad power supply.

do you still have the problem, my hum continued to visit me today in the session, killing the power and powering back up again fixes the problem but its getting annoying now

Volodia · 10th April 2007, 07:28 AM

Hi,

I don't have this problem exept when the tube is in bad shape but bear in mind there are tubes in the power supply too so those should be checked as well .

audioversum · 24th May 2007, 12:59 PM

Hi,
<o:p> </o:p>
Since 2006 we have the same problem that you described with our c800g. Our technician found out that there was a problem with the condensates of the heater voltage in the microphone and the power supply. They have been replaced and the hum was gone; but only for 3 month... The problem suddenly reappeared and so we gave the mic to a professional broadcast service of sony. They replaced the tube and gave us another power supply to check if the hum was gone now, but it wasn’t. <o:p></o:p>
Any suggestions what could be done??? Thanks a lot!

[SIGPIC][/SIGPIC]<o:p></o:p>

MIKEHARRIS · 24th May 2007, 04:57 PM

Sony service can fix the problem ..tho not always first time.
Remember to include the power supply with the mic...when you send it for service

Je55 · 28th August 2007, 08:09 AM

So today I took the mic into my tech friends at interscope and we tested the mic and power supply on the bench.

My mic, their power supply, their power supply my mic etc...

turns out... Its not the mic, or any of the three tubes

Its my power Supply!.. we swapped out the tubes from the PS too and it didnt make a difference. so... it has to be a component within the power supply that is reacting on a thermal level.

got you thinking now huh

Je55 · 8th March 2008, 02:20 AM

so heres a little update...

After my visit to Bill at Interscope, the hum cleared, I'm not sure if it was luck or what but it was fine for months.

Last week the tube started to give out (producing rustling noises) so i replaced it and the mic once again sounded great but yesterday the hum has reappeared.

I made a high gain recording today so you could listen to it.

the chain is as follows:

C800G > 1073dpa (Gain = +50 / Trim = +10) > HD 192

http://www.jessjackson.com/files/c800ghum.mp3

Besides the windows being open and the traffic noise, the hum is apparent.

Is this the same hum that everyone else is getting?

PS: I just realized from the images above that your tech also cut the wire running from the ground to the PCB, I only cut the short unshielded wire running from the ground to the chassis so I'll try that today and report back.

Jess

radkins · 16th March 2008, 06:53 AM

Quote:

Originally Posted by Je55

so heres a little update...

After my visit to Bill at Interscope, the hum cleared, I'm not sure if it was luck or what but it was fine for months.

Last week the tube started to give out (producing rustling noises) so i replaced it and the mic once again sounded great but yesterday the hum has reappeared.

I made a high gain recording today so you could listen to it.

the chain is as follows:

C800G > 1073dpa (Gain = +50 / Trim = +10) > HD 192

http://www.jessjackson.com/files/c800ghum.mp3

Besides the windows being open and the traffic noise, the hum is apparent.

Is this the same hum that everyone else is getting?

PS: I just realized from the images above that your tech also cut the wire running from the ground to the PCB, I only cut the short unshielded wire running from the ground to the chassis so I'll try that today and report back.

Jess

My C-800 has the same problem. Bill bradley told me it was a bad cap and to send it to him, but I didn't want to be without it so I kept dealing with it. Just bought a Bill Bradley C-12, so I am thinking about sending it in.

walth · 16th March 2008, 07:04 AM

same problem with my friends C-800G. the tubes have to be replaced every so often. same with the Avalon VT-737SP that he uses it with.

Je55 · 20th March 2008, 12:45 AM

Thanks, I just spoke to bill and he informed me that its the capacitors in the power supply that need replacing.

He recommends a Telefunken tube

Quote:

Originally Posted by radkins

My C-800 has the same problem. Bill bradley told me it was a bad cap and to send it to him, but I didn't want to be without it so I kept dealing with it. Just bought a Bill Bradley C-12, so I am thinking about sending it in.

joelpatterson · 20th March 2008, 02:06 PM

He didn't recommend after years of this you get a different mic?

Je55 · 24th March 2008, 08:18 PM

Quote:

Originally Posted by joelpatterson

He didn't recommend after years of this you get a different mic?

A few months... No

phillysoulman · 24th March 2008, 09:14 PM

Whats so special about the 800G??
Its just a way over priced over hyped piece of doo doo..imho

joelpatterson · 25th March 2008, 12:00 AM

Quote:

Originally Posted by Je55

A few months... No

I seem to see this quote in the first post, which seems to date from December 30, 2006...

"I just got this new and after 5-10 mins of having turned the mic on, i get a faint hum (sounds like a ground hum) but the hum gets louder over the next ten minutes untill its a very loud square wave sounding hum."

All is not as it seems, tho-- brother I sure know that well....

radkins · 26th March 2008, 06:01 AM

Quote:

Originally Posted by phillysoulman

Whats so special about the 800G??
Its just a way over priced over hyped piece of doo doo..imho

...lol..I guess all those chart topping engineers must be wrong. They suck so bad I just bough a second one.

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31st December 2006, 12:41 AM	#1
Je55 Gear maniac Join Date: Oct 2006 Posts: 282	Problem with my Sony c800g I just got this new and after 5-10 mins of having turned the mic on, i get a faint hum (sounds like a ground hum) but the hum gets louder over the next ten minutes untill its a very loud square wave sounding hum. Initially i thought it was a grounding problem with the power supply, but having noticed that the hum gets louder would lead me to think its a capacitor holding current? or a bad rectifier maybe something like that anyway. When i turned off the power supply and turn it back on again, the buzz is completely gone. either way, i called the retailer and they informed me that it would be hard to trade it out for a new one as sony have stopped production on the mic due to a rare metal or something and something else about homeland security not allowing this material into the country anymore. so they said they can have it fixed for no charge but i would have to go a week without my mic and i'm tracking every day. my path is into avalon 737 > Neve 1073 > ad16x but ive tried going straight into mini me and still get same noise so its not the chain. ANYONE ELSE HAD THIS OR SEEN THIS?

31st December 2006, 01:41 AM	#2
Tony Shepperd Lives for gear Join Date: Oct 2006 Location: Los Angeles, CA. Posts: 2,204	The 800G tube might be blown. It seems to be happening a lot lately. __________________ Mixing in the box, requires thinking outside the box. www.tonysound.com http://techbreakfast.com/dvd/index.php http://myspace.com/mixinginthebox AES 2008 Videos some of my ITB mixes

31st December 2006, 02:17 AM	#4
Tony Shepperd Lives for gear Join Date: Oct 2006 Location: Los Angeles, CA. Posts: 2,204	I had my tech Dave Hecht open the mic up and check it out from top to bottom. I can give you his number if you'd like. __________________ Mixing in the box, requires thinking outside the box. www.tonysound.com http://techbreakfast.com/dvd/index.php http://myspace.com/mixinginthebox AES 2008 Videos some of my ITB mixes

9th April 2007, 06:21 AM	#9
Volodia Gear addict Join Date: Jul 2002 Location: Paris Posts: 479	Hi, My tech moded my C800Gs . He said somehing about ground loop in the power supply . __________________ "Could anyone please post an A/B comparison of the 'pull the blanket of the speaker' effect?" Jamzone

31st December 2006, 01:49 AM	#3
Je55 Gear maniac Join Date: Oct 2006 Posts: 282	Thanks tony, is there a way to tell?

31st December 2006, 03:20 AM	#5
PhilE Lives for gear Join Date: Jun 2005 Location: UK Posts: 1,213	I had a similar problem in a couple of studios but not in others- seem really sensative to anything in the mains.

31st December 2006, 07:26 AM	#6
Igotsoul4u Lives for gear Join Date: Mar 2005 Location: New York, NY Posts: 1,607	I had the same problem with mine. Sent it backed to sony and they replaced the tube. Can't remember if it was free or not.

31st December 2006, 07:03 PM	#7
Je55 Gear maniac Join Date: Oct 2006 Posts: 282	Thanks for the replies guys. I really appreciate that. I'm not really sure what im gonna do yet, ive been using it over the past couple days and it seems to be fine now so i dont know whats going on, i think when i get a space in my tracking schedule, i might send it off to be looked at anyway though. also, as a side note... I read an article on how the best match for the sony is the avalon 737 as it matched the impedence perfectly, ive been looking at getting the millenia, thats the reason i ask. thanks guys, Jesse

9th April 2007, 06:52 AM	#11
Volodia Gear addict Join Date: Jul 2002 Location: Paris Posts: 479	In fact the audio ground is linked to the chassis which causes ground loops so he just cut it . there are other things he did that he wants to keep "secret" . Attached Thumbnails __________________ "Could anyone please post an A/B comparison of the 'pull the blanket of the speaker' effect?" Jamzone

9th April 2007, 04:20 PM	#13
Volodia Gear addict Join Date: Jul 2002 Location: Paris Posts: 479	Hi, He did other mods that he didn't specify ( did one out of two and wants me to test them ) . __________________ "Could anyone please post an A/B comparison of the 'pull the blanket of the speaker' effect?" Jamzone

9th April 2007, 06:26 PM	#14
Je55 Gear maniac Join Date: Oct 2006 Posts: 282	I cut the ground like your picture, and I have a session this afternoon so we will see if it works for me ;)

9th April 2007, 11:53 PM	#15
InsaneMixaken Gear nut Join Date: Dec 2005 Posts: 149	I recently had the same problem I was told by Sony it could be the tube or a bad power supply. __________________ INSANEMIXAKEN.COM VIOLATOR ALL STAR DJ'S http://www.myspace.com/insanemixaken1 Sirius Satellite Radio Hip Hop Nation Channel 40 Violator Radio Channel 40 Superadio

10th April 2007, 07:28 AM	#17
Volodia Gear addict Join Date: Jul 2002 Location: Paris Posts: 479	Hi, I don't have this problem exept when the tube is in bad shape but bear in mind there are tubes in the power supply too so those should be checked as well . __________________ "Could anyone please post an A/B comparison of the 'pull the blanket of the speaker' effect?" Jamzone

24th May 2007, 12:59 PM	#18
audioversum Gear interested Join Date: May 2007 Location: Germany - Düsseldorf Posts: 1	Hi, <o:p> </o:p> Since 2006 we have the same problem that you described with our c800g. Our technician found out that there was a problem with the condensates of the heater voltage in the microphone and the power supply. They have been replaced and the hum was gone; but only for 3 month... The problem suddenly reappeared and so we gave the mic to a professional broadcast service of sony. They replaced the tube and gave us another power supply to check if the hum was gone now, but it wasn’t. <o:p></o:p> Any suggestions what could be done??? Thanks a lot! [SIGPIC][/SIGPIC]<o:p></o:p>

24th May 2007, 04:57 PM	#19
MIKEHARRIS Lives for gear Join Date: Jul 2002 Location: MIAMI FLA Posts: 1,308	Sony service can fix the problem ..tho not always first time. Remember to include the power supply with the mic...when you send it for service __________________ harrisaudiosystems.com

28th August 2007, 08:09 AM	#20
Je55 Gear maniac Join Date: Oct 2006 Posts: 282	So today I took the mic into my tech friends at interscope and we tested the mic and power supply on the bench. My mic, their power supply, their power supply my mic etc... turns out... Its not the mic, or any of the three tubes Its my power Supply!.. we swapped out the tubes from the PS too and it didnt make a difference. so... it has to be a component within the power supply that is reacting on a thermal level. got you thinking now huh

8th March 2008, 02:20 AM	#21
Je55 Gear maniac Join Date: Oct 2006 Posts: 282	so heres a little update... After my visit to Bill at Interscope, the hum cleared, I'm not sure if it was luck or what but it was fine for months. Last week the tube started to give out (producing rustling noises) so i replaced it and the mic once again sounded great but yesterday the hum has reappeared. I made a high gain recording today so you could listen to it. the chain is as follows: C800G > 1073dpa (Gain = +50 / Trim = +10) > HD 192 http://www.jessjackson.com/files/c800ghum.mp3 Besides the windows being open and the traffic noise, the hum is apparent. Is this the same hum that everyone else is getting? PS: I just realized from the images above that your tech also cut the wire running from the ground to the PCB, I only cut the short unshielded wire running from the ground to the chassis so I'll try that today and report back. Jess

16th March 2008, 07:04 AM	#23
walth Lives for gear Join Date: Jan 2007 Location: San Diego Posts: 856	same problem with my friends C-800G. the tubes have to be replaced every so often. same with the Avalon VT-737SP that he uses it with. __________________ walter

20th March 2008, 02:06 PM	#25
joelpatterson Lives for gear Join Date: May 2005 Location: Albany, New York Posts: 3,466	He didn't recommend after years of this you get a different mic? __________________ Mountaintop Studios ~the peak of perfection~ Petersburgh NY 12138 mountaintop@taconic.net

24th March 2008, 09:14 PM	#27
phillysoulman Lives for gear Join Date: Jan 2008 Location: The City Of Brotherly Love And Sisterly Affection Posts: 2,762	Whats so special about the 800G?? Its just a way over priced over hyped piece of doo doo..imho __________________ "Professionals Built The Titanic,But Amateurs Built The Ark"

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