1210 hum problem.

[Floyddroid]

I am about to give up the ghost on my 1210. I have a slight hum which i cannot get rid of and apparently is a common problem when rewiring the arm. I have a Rega RB300 with incognito rewire on an Origin Live arm plate. I looked on the Origin Live support site and they described splitting tone arm wires on the earth etc, something i don't feel i am confident enough to do. Is there anyone out there can help with this. I had the same problem when i put my OL Encounter on the deck.:(

[aniki]

I am about to give up the ghost on my 1210. I have a slight hum which i cannot get rid of and apparently is a common problem when rewiring the arm. I have a Rega RB300 with incognito rewire on an Origin Live arm plate. I looked on the Origin Live support site and they described splitting tone arm wires on the earth etc, something i don't feel i am confident enough to do. Is there anyone out there can help with this. I had the same problem when i put my OL Encounter on the deck.:(

Hey,
Don't give up yet! Once you cure that hum your 1210 will doubtless reach new heights of sonic awesomeness :)
In standard guise there is an extra wire from the arm back to the pitch slider assembly which in turn is linked back to the PCB and then in turn back to the main earth point on the deck (the lower left corner earth tag/mounting post screw).
Once the standard arm is removed this is removed also and can cause issues.
-
Before going any further we need to understand a little more about what you have now.
Do you still have you rpitch slider installed and more importantly, is it still connected internally (via the black or white plug) to the main PCB?
Does your rewired RB300 have its own earth cable as well as left and right signal leads?

[CageyH]

This may help?

http://theartofsound.net/forum/showthread.php?34419-Grounding-the-armboard&p=583869#post583869 (http://theartofsound.net/forum/showthread.php?34419-Grounding-the-armboard&p=583869#post583869)

[Floyddroid]

Thanks for the reply Adam. here goes... No, the pitch slider has been removed and yes the RB300 now has it's own separate earth wire as well as the signal cables. I have a LDA power supply fitted.
Hey,
Don't give up yet! Once you cure that hum your 1210 will doubtless reach new heights of sonic awesomeness :)
In standard guise there is an extra wire from the arm back to the pitch slider assembly which in turn is linked back to the PCB and then in turn back to the main earth point on the deck (the lower left corner earth tag/mounting post screw).
Once the standard arm is removed this is removed also and can cause issues.
-
Before going any further we need to understand a little more about what you have now.
Do you still have you rpitch slider installed and more importantly, is it still connected internally (via the black or white plug) to the main PCB?
Does your rewired RB300 have its own earth cable as well as left and right signal leads?

[CageyH]

Try earthing the PCB to the phono stage.

[aniki]

Thanks for the reply Adam. here goes... No, the pitch slider has been removed and yes the RB300 now has it's own separate earth wire as well as the signal cables.

OK. Does the hum persist with and without the arm ground wire connected?
The next easiest option as Kevin suggests is to find a piece of insulated cable; strip both ends; fit a ring connector on one end and a fork connector on the other.
Under the platter, (with power disconnected) look for the screw holding the bottom left corner of the main PCB to the chassis. The negative feed for your power supply should also be connected here.
Attach the ring end of your new cable under this screw and route the remainder out through the same hole as the power supply cable.
Attache the fork end to the earth post on your phono stage or amp (as wll as the earth lead from your arm)
-
This will achieve the same result as splicing your arm earth wire into the pitch slider earth wire.

[daytona600]

http://snvinyl.co.uk/WebRoot/Daily/Shops/eshop943300/55AB/BB12/F587/9130/0D18/0A0C/05E8/3AE3/CustomImage_16.jpg

Pro-Ject Earth Plug

Though vinyl is one of our most cherished and enjoyed music platforms, the equipment used to playback records is - by its very nature - prone to issues and problems that can disrupt your experience. One of the most common issues reported to us is mains hum, and though this can be a problem it is almost always not down to a faulty turntable; instead it's because there is not a strong enough 'true' earth in your system.

All turntables are prone to attract some level of noise, however, most (like all Pro-Ject record players) are engineered to reduce this tendency as much as possible - so you often only hear it with the amplifier volume on maximum and no record playing. When there is a noise that's audible during normal playback it is often due to poor grounding (even with the supplied ground lead linking the turntable to your phono stage/amplifier), and the problem is typically environmental.

There are lots of messy or impractical solutions to try and find an alternative earth-point, but we've found that anti-static earth plugs like this are a great solution in most instances. Simply take an additional ground lead, connect one end to the junction box on the back of your turntable and the other to one of the screw terminals on the plug, then plug it in. This plug has plastic pins at the live and neutral terminals, but a metal pin connected to the earth - so you can utilise the same ground-point your home electrical system uses to try and eradicate any noise in your system.

Start enjoying your music again!

[DSJR]

Sorry to piss on this thread, but techies and Rega arms aren't always good marriages..

Try one of Speedy Steve's hard-wood armboards. I reckon any earth loop will be broken and it's certainly sound better too I reckon :)

[walpurgis]

techies and Rega arms aren't always good marriages..

Ergonomically they are not. A Rega arm at the right height has the armlift a bit low for my liking. I find it awkward, as it's close to the top of the base.

[Floyddroid]

Mmmm, some interesting s..t here. Thanks chaps. Loads to think about.

[Floyddroid]

Which junction box. There isn't one on my 1210.
http://snvinyl.co.uk/WebRoot/Daily/Shops/eshop943300/55AB/BB12/F587/9130/0D18/0A0C/05E8/3AE3/CustomImage_16.jpg

Pro-Ject Earth Plug

Though vinyl is one of our most cherished and enjoyed music platforms, the equipment used to playback records is - by its very nature - prone to issues and problems that can disrupt your experience. One of the most common issues reported to us is mains hum, and though this can be a problem it is almost always not down to a faulty turntable; instead it's because there is not a strong enough 'true' earth in your system.

All turntables are prone to attract some level of noise, however, most (like all Pro-Ject record players) are engineered to reduce this tendency as much as possible - so you often only hear it with the amplifier volume on maximum and no record playing. When there is a noise that's audible during normal playback it is often due to poor grounding (even with the supplied ground lead linking the turntable to your phono stage/amplifier), and the problem is typically environmental.

There are lots of messy or impractical solutions to try and find an alternative earth-point, but we've found that anti-static earth plugs like this are a great solution in most instances. Simply take an additional ground lead, connect one end to the junction box on the back of your turntable and the other to one of the screw terminals on the plug, then plug it in. This plug has plastic pins at the live and neutral terminals, but a metal pin connected to the earth - so you can utilise the same ground-point your home electrical system uses to try and eradicate any noise in your system.

Start enjoying your music again!

[RichB]

Sorry to piss on this thread, but techies and Rega arms aren't always good marriages..

Try one of Speedy Steve's hard-wood armboards. I reckon any earth loop will be broken and it's certainly sound better too I reckon :)

+1

Don't you also have to be careful with your NVA phono stage placement to avoid hum too.

You know who on that other place might have some insight on this

[daytona600]

Which junction box. There isn't one on my 1210.
advice for pro-ject turntables as they use a terminal box

Simply take an additional ground lead of your turntable and the other to one of the screw terminals on the plug, then plug it in.

[aniki]

Which junction box. There isn't one on my 1210.

Make the connection from the common ground I mentioned in my previous post. Bottom left mounting screw of the main PCB.

[Floyddroid]

I cured the problem. I unplugged the Techie, put it in a cupboard and played records on my Michell Orbe SE.
Make the connection from the common ground I mentioned in my previous post. Bottom left mounting screw of the main PCB.

[allthingsanalogue]

The problem on the Stock Rega arm is that the left channel negative is connected to the arm tube and also this doubles as the earth that you would get on most conventional arm setups that use a separate earth lead.

The left negative connection is picking up hum from the negative 21v that the deck puts through the chassis.

The only way to deal with this is to remove the plug for the bottom from the arm and split the blue negative wire channel from the black wire where they are soldered together and run a seaprate earth from the negative point on the SL1210 PCB to your phono stage earth point.

http://www.aqvox.de/REGA_250_300_Tonearm-mod-humm-free-remove-signal-groundrega_mod.html

http://www.aqvox.de/webpics/Rega_open.jpg

YOU NEED TO SEPERATE THE METAL STRIP FROM THE BLUE CONNECTION AND CONNECT THE BLACK WIRE TO THE METAL STRIP ONLY AND THEN RECCONECT. ONCE YOU ADD A EARTH WIRE FROM THE SL1210 TO THE PHONO STAGE GROUND IT WILL WORK FINE.

NB - IF YOU HAVE A WOODEN ARMBOARD FROM STEVE YOU NEED TO ADD THE EARTH LEAD TO THE ARM ITSELF.

[Floyddroid]

My RB300 is rewired with an Icognito kit. There are two signal cables and a separate earth wire. At the moment it is mounted on my 1210 via an Origin Live mounting plate drilled for a Rega fitting. The pitch slider has been removed. I fear that it may be the mounting plate that is the problem. would Speedy Steve's mounting board sort things?
The problem on the Stock Rega arm is that the left channel negative is connected to the arm tube and also this doubles as the earth that you would get on most conventional arm setups that use a separate earth lead.

The left negative connection is picking up hum from the negative 21v that the deck puts through the chassis.

The only way to deal with this is to remove the plug for the bottom from the arm and split the blue negative wire channel from the black wire where they are soldered together and run a seaprate earth from the negative point on the SL1210 PCB to your phono stage earth point.

http://www.aqvox.de/REGA_250_300_Tonearm-mod-humm-free-remove-signal-groundrega_mod.html

http://www.aqvox.de/webpics/Rega_open.jpg

YOU NEED TO SEPERATE THE METAL STRIP FROM THE BLUE CONNECTION AND CONNECT THE BLACK WIRE TO THE METAL STRIP ONLY AND THEN RECCONECT. ONCE YOU ADD A EARTH WIRE FROM THE SL1210 TO THE PHONO STAGE GROUND IT WILL WORK FINE.

NB - IF YOU HAVE A WOODEN ARMBOARD FROM STEVE YOU NEED TO ADD THE EARTH LEAD TO THE ARM ITSELF.

[allthingsanalogue]

If it was a speedy steve board it most certainly would but as your pitch slider had been removed as another member said all you should need to do is earth the armboard or chassis from the negative left hand corner of the PCB to the phono stage.

[Floyddroid]

It's still in the cupboard. Sick of throwing money at it and simply can't be arsed with it at the moment.

[Ingrid]

What about looking round for a planar 2 second hand?
It would make the arm happy.

[337alant]

Ill have a look at it when I get home Steve

Alan

[Floyddroid]

Why would i want t do that? I already have a Michell Orbe SE. I am merely frustrated with the Techie.
What about looking round for a planar 2 second hand?
It would make the arm happy.

[Floyddroid]

Cheers Alan. You're the man!
Ill have a look at it when I get home Steve

Alan

[Floyddroid]

When are you home next Alan? I have tried to PM you but your inbox is full
Ill have a look at it when I get home Steve

Alan

[Clive197]

The OL Encounter works fine on my Techie - No Hum. Earth attached in the normal way to Phonostage.

[Floyddroid]

Well, it won't on mine Clive.

The OL Encounter works fine on my Techie - No Hum. Earth attached in the normal way to Phonostage.

[Clive197]

I may well have missed this but what cartridge are you using? I've heard that some cartridges can produce an earth loop. There is on some cartridges Ive owned a small metal strap attached to one of the negative pins. If this is the case with yours, try disconnecting that pin to see if the hum stops.
If the cartridge has a metal body, that could also be causing the earth hum.

[Floyddroid]

I am using a Denon DL103
I may well have missed this but what cartridge are you using? I've heard that some cartridges can produce an earth loop. There is on some cartridges Ive owned a small metal strap attached to one of the negative pins. If this is the case with yours, try disconnecting that pin to see if the hum stops.
If the cartridge has a metal body, that could also be causing the earth hum.

[Floyddroid]

Just about fed up with it now. Going to refit the RB250 and flog it.

[Spectral Morn]

I am about to give up the ghost on my 1210. I have a slight hum which i cannot get rid of and apparently is a common problem when rewiring the arm. I have a Rega RB300 with incognito rewire on an Origin Live arm plate. I looked on the Origin Live support site and they described splitting tone arm wires on the earth etc, something i don't feel i am confident enough to do. Is there anyone out there can help with this. I had the same problem when i put my OL Encounter on the deck.:(

Had three types of OL arm (modified RB300, OL Silver, Encounter) on three Technics decks 1200 and two 1210s with no hum problems at all. The armboard was an OL one. Two of the decks had flying earth leads, over and above the tonearm one (never had to connect them to the phonostage just the tonearm one) and one didn't, just the tonearm earth lead.

Does your deck have an external PSU ?

I wouldn't give up, the fix may be quiet simple to implement.


Regards Neil

[Floyddroid]

Yes, it has a LDA power supply. In true Prog fashion i am growing closer to doing a Keith Emerson on the 1210. I can see it being sold off in bits. F.....g sick of it!!!!!!!
Had three types of OL arm (modified RB300, OL Silver, Encounter) on three Technics decks 1200 and two 1210s with no hum problems at all. The armboard was an OL one. Two of the decks had flying earth leads, over and above the tonearm one (never had to connect them to the phonostage just the tonearm one) and one didn't, just the tonearm earth lead.

Does your deck have an external PSU ?

I wouldn't give up, the fix may be quiet simple to implement.


Regards Neil

[Spectral Morn]

Yes, it has a LDA power supply. In true Prog fashion i am growing closer to doing a Keith Emerson on the 1210. I can see it being sold off in bits. F.....g sick of it!!!!!!!

Attach a ground wire to the pitch slider - as per a normal Technics tonearm - and try a couple of things. First wire to the OL board and ground it to the board as would be the case with the original arm. If that doesn't work attach a longer wire to the same point on the OL board where the pitch slider wire is attached and then attach the long wire to the phonostage. If that doesn't work remove the wire from the pitchslider and armboard and then run a long grounding wire instead from the pitch slider only and attach to the phonostage.

Obviously attach to the phonostage with volume turned down and switch to a different input on the amp. I don't switch phonostage off for doing this but might be wise to do so. Switch everything on, select input and turn volume up to see if the hum has gone, or is worse.


Regards Neil

[allthingsanalogue]

Try leaving the arm fitted to the armboard but lifting the armboard off the deck. Try to see if touching the armboard to the chassis makes the hum start or stop. If its still doing when not touching the deck it must be a arm problem.

[Floyddroid]

Sounds like a plan.
Try leaving the arm fitted to the armboard but lifting the armboard off the deck. Try to see if touching the armboard to the chassis makes the hum start or stop. If its still doing when not touching the deck it must be a arm problem.

[Bacek]

I did simple mod for transformer mount. I have exchanged stiff rubber spacers used to mount transformer to chassis to foam spacers + rubber spring/spacer used for CD drive mounting. Exchanged screws for slightly longer so now they are not mounting transformer firmly. Now transformer suspension is relay soft. Previously I heard humm (50+100Hz) with amp on max attenuation and 103dB/W speakers. Now humm is gone. I have to take some measurements. I'll create thread with some pictures later.

I think it's pretty nice alternative to external PS mods.

[Floyddroid]

Indeed. But the problem i have is with the tonearm not a transformer

I did simple mod for transformer mount. I have exchanged stiff rubber spacers used to mount transformer to chassis to foam spacers + rubber spring/spacer used for CD drive mounting. Exchanged screws for slightly longer so now they are not mounting transformer firmly. Now transformer suspension is relay soft. Previously I heard humm (50+100Hz) with amp on max attenuation and 103dB/W speakers. Now humm is gone. I have to take some measurements. I'll create thread with some pictures later.

I think it's pretty nice alternative to external PS mods.

[Bacek]

I wrote it after allthingsanalogue suggestion.

If humm is on when arm is tightly coupled to chassis and dissipates after lifting arm from chassis it may be mechanical humm transferred from transformer.