Grado hum Technics

[cafe latte]

I bought a Grado platinum from Alec and I am very happy with it BUT it seems Technics sl1210 can be added to the hum list. The hum is only on the last couple of tracks and is not severe but annoying all the same. I am hoping it is the internal transformer causing the problem as an external psu is a mod I have been thinking abut for a while anyway but I dont want to dive into this mod unless I am sure it will help. Does anyone know for sure if an external psu will solve Grado hum on a Technics?
I did an experiment, I had the Technics switched off on its rotary on off switch and the amp and preamp on and there was no hum but if you tap the headshell it confirms the cart is still conected. If i switched on the rotary switch the hum started even though the platter was not spinning so I am guessing it must be the transformer.
Any thoughts?
Regards
Chris

[Ldg]

Any thoughts?

Pay closer attention to ld's posts?

[cafe latte]

Any thoughts?

Pay closer attention to ld's posts?

Not that helpful is it.
Regards
CL

[Ldg]

Well it is, CL. I've previously posted extensively on the general nature of the problem, advising caveats, and what one might do to work around it if in a hole. Seek and ye will find.

[cafe latte]

LD as i have never owned a Grado before I am unlikely to have been interested in any previous Grado posts. I have done a search on this related to Technics and came up with nothing useful so I posted here. If you have any useful input to this thread related to solving the problem on a Technics great as this is why I started this thread. But telling me I sould pay more attention to your previous posts on the issue is not that useful.
Regards
CL

[Ldg]

But telling me I sould pay more attention to your previous posts on the issue is not that useful

Yes it really obviously is, CL.

[cafe latte]

But telling me I sould pay more attention to your previous posts on the issue is not that useful

Yes it really obviously is, CL.

So with this response I guess you came not to help at all?
Regards
CL

[Singlemania45]

I lost the hum when I went dc on my Systemdek IIX and ditched the internal ac power supply in favour of the Origin Live external power supply and controller.
Tim

[avole]

CL, LD seems to be going through a difficult period at the moment, don't worry about it!

[cafe latte]

CL, LD seems to be going through a difficult period at the moment, don't worry about it!

I noticed
Regards
CL

[Ldg]

No, there's nothing wrong here, my original comment was light hearted and with a wink. I'd like to think it was quite funny ! And really, if you bother to search my posts on the topic, you'll see that I've invested a lot of effort to understand the nature of the problem in significant detail as to cause. And knowing this, what one can then do about it, along with numerous caveats as to the issue helpfully advising people of the issue before ever wading in if one is either unprepared or unable to then resolve it for oneself.

And I really grow tired of being patronised, avole, CL. You guys are on a hair trigger, and for some reason I seem to be a target, so just chill out. What do you want, congratulations for ignoring existing content before getting into the situation in the first place, and then not even looking it up when I point it out ?

[cafe latte]

No, there's nothing wrong here, my original comment was light hearted and with a wink. I'd like to think it was quite funny ! And really, if you bother to search my posts on the topic, you'll see that I've invested a lot of effort to understand the nature of the problem in significant detail as to cause. And knowing this, what one can then do about it, along with numerous caveats as to the issue helpfully advising people of the issue before ever wading in if one is either unprepared or unable to then resolve it for oneself.

And I really grow tired of being patronised, avole, CL. You guys are on a hair trigger, and for some reason I seem to be a target, so just chill out. What do you want, congratulations for ignoring existing content before getting into the situation in the first place, and then not even looking it up when I point it out ?

Look LD wink or not I asked for specific info on how to sort this issue and you were unwilling to give it. I searced VE and found nothing specific to Technics. If you have info please post it here and stop messing about. Nobody is patronising you READ WHAT YOU POSTED HERE you are not being helpful. If you know the solution to my hum you could have told me in far less words typed than you have typed avoiding telling me what is wrong. You are just being inhibitive and disruptive to this thread it seems. I asked if it might be the transformer causing the hum? The answer to this is Yes or no a lot shorter than your unhelpful responses.
Regards
CL

[OneyedK]

I believe LD is referring to this topic:
viewtopic.php?t=27295

And correct me if I'm wrong LD, but I remember two things:
1) effective inductance of a Grado is about 10 times as high as their specs
2) the coil winding arrangement is not humbucking

Two things that make a Grado very sensitive to picking up hum.

So on topic, yes, moving the transformer "far" away from the cartridge will help.
But still, all EM radiation is prone to be picked up and a Technics is not exactly EM radiation free. (not a problem with "normal" cartridges)

[Ldg]

Look LD wink or not I asked for specific info on how to sort this issue and you were unwilling to give it.

No, I told you from the outset my best advice is to search my extensive content on the topic. Too extensive, some might say (!), a quick search using the terms ld, Grado and hum turned up 685 hits, no less. I previously explored why it seems so hard to find a universal workaround, and in so doing not only learned a fantastic amount about cartridge magnetics, but also as a resource so that when devising TT workarounds, you might know what you're dealing with. Those are the exact words I used on this thread example here : viewtopic.php?f=19&t=27295&start=46. But well worth looking at the surrounding posts in that thread, which are variously decribed as "A stroke of genius, Luckdog", "Ah, Yes! I see it now clearly. I understand it much better when you state it that way. Brilliant!".

But you have to actually do the search and read the results, CL. Which would have taken less time and effort than you invested in having yet another cheap pop at me. Again.