Preamp?

[Beave]

Even with cell phones, which purposefully emit high frequency radiation and are held extremely close to the body, there is no proof that they cause cancer. There is a level of concern, yes, and studies are ongoing. But that's *very* different from saying definitively that the levels of radiation from power lines - which is far lower in frequency and amplitude - cause cancer.

 

[ellisr63]

The risk of EMF, and your health. I do not trust the reports that say EMF is not harmful.The Swedes did a lot of testing in the 80s on the dangers of radiation to your health. I have a rare heart disease that effects 1% of white males, and a much higher percentage of people of color per Heart Drs.. I researched it, and told him I think it is much higher than the research says. My Dr. said I had a very good point, could be right. The reason I say that is they discover the disease during autopsies of 20-30 year olds that die of a heart attack. When is the last time you heard of a person dying of a heart attack over 50 years old having an autopsy.?

 

[Beave]

So the Swedes did a lot of research in the 80s. What were their conclusions? Or do you not trust them? I can't tell. You seem to only trust your gut feelings on these things.

 

[ellisr63]

Actually had little actual information other than this guy's interpretation of use/effects. Sure wouldn't rely on it.

There was a longer video which also stated he is now considered an expert and is contacted by medical companies, and if I recall correctly he is a court expert too.

 

[ellisr63]

Ok, off track long enough on this. I think I might have found the solution...a Graham Slee Accession phono preamp.

Anyone have any experience with one? I have read the reviews, and they it sounds like a great phono preamp.

 

[ellisr63]

So the Swedes did a lot of research in the 80s. What were their conclusions? Or do you not trust them? I can't tell. You seem to only trust your gut feelings on these things.

The Swedes found that radiation from monitors were unsafe, and made stringent safety requirements for all monitors (Europe changed the regulations for safer monitors before the USA did). Some of the safety regulations on monitors were because of the Swedes.

 

[Beave]

I wondered who Barrie Trower is, so I Googled his name. This is the first link that came up:

https://rationalwiki.org/wiki/Barrie_Trower

The rest were mostly links to blogs and psuedo-scientific sites that proffer FUD.

If we can't agree on what reliable sources are, we have no basis for discussion.

 

[lovinthehd]

Yep I came up with similar....he's a chemtrails guy, too.

 

[Beave]

Hahaha, I should have guessed that.

Then again, the chemtrails have altered my brain chemistry and led me to doubt the existence of chemtrails. Therefore, they must be real.

 

[MR.MAGOO]

Joe Jackson

 

[PENG]

Does a phono preamp have a volume control, and gain, or is it just like the phono buffer amps that need to be plugged into a preamp,AVR, etc?

Budget under $1k...prefer under $500.

Sent from my SM-T550 using Tapatalk

This one comes just under your $1k budget:
https://www.amazon.com/Pro-Ject-Phono-Box-Preamplifier-Black/dp/B008UV5DZI

Is there any way you can put your turntable, phono preamp (usually very small) and the power amp closer to each other, like within 10-15 feet between the turntable and the phono preamp and 20-25 ft between the phono preamp and power amp? If you can then you don't need balanced I/O. There are more choices/lower cost phono preamps if you can live without balanced I/Os.

 

[ellisr63]

This one comes just under your $1k budget:
https://www.amazon.com/Pro-Ject-PMy hono-Box-Preamplifier-Black/dp/B008UV5DZI

Is there any way you can put your turntable, phono preamp (usually very small) and the power amp closer to each other, like within 10-15 feet between the turntable and the phono preamp and 20-25 ft between the phono preamp and power amp? If you can then you don't need balanced I/O. There are more choices/lower cost phono preamps if you can live without balanced I/Os.

My turntable will be within 10. Of my ...so yes.

 

[ellisr63]

This one comes just under your $1k budget:
https://www.amazon.com/Pro-Ject-Phono-Box-Preamplifier-Black/dp/B008UV5DZI

Is there any way you can put your turntable, phono preamp (usually very small) and the power amp closer to each other, like within 10-15 feet between the turntable and the phono preamp and 20-25 ft between the phono preamp and power amp? If you can then you don't need balanced I/O. There are more choices/lower cost phono preamps if you can live without balanced I/Os.

That is a great find, thank you!

 

[TLS Guy]

From the a.c. power lines. I read a medical article a while back where theybwere testing power line radiation, and cardiac testing. They had to stop the testing. As it was too harmful to the patients pacemakers. I have a pacemaker, and try to avoid being within 8' of powerlines just like in the medical article.

No pacemaker of any vintage will be upset with that amount of RF. It is true older units were upset by welders and high magnetic and electric fields, but nothing like the minute amount that would be produced by a home AV system. One LED light bulb or dimmer switch would radiate many times more than your AV system.
Heck the current line of pacers tolerate going in an MRI scanner and you can get a higher electromagnetic filed than that.

Your pacemaker is NOT a reason for those unhandy design choices. So strike that out of your design plans.

If you do have an older pacemaker then you do have to be careful of intense fields. There have been serious incidents involving the store security systems at the doors that are designed to prevent shop lifting. That is an intense field. So if you have not had an incident with one of those, you are A OK.

 

[PENG]

My turntable will be within 10. Of my ...so yes.

Well then if the power amp is also within 10-15 ft from the preamp you definitely don't need balanced connections, seriously. Just use good quality interconnects.

 

[ellisr63]

Well then if the power amp is also within 10-15 ft from the preamp you definitely don't need balanced connections, seriously. Just use good quality interconnects.

My power Amps will be in or close to the speakers.

 

[PENG]

My power Amps will be in or close to the speakers.

Okay then balanced it is, just that there are fewer choices, so for high quality products you are going to pay more.

 

[ellisr63]

Okay then balanced it is, just that there are fewer choices, so for high quality products you are going to pay more.

The front speakers will be close to the wall which is only 19' wide, and I anticipate putting the turntable somewhere in between the speakers. The amps will be DIY. B&O modules with minidsp 2x4 crossovers... so the max distance to any amp/speaker would be 8' to 10' from the turntable.

My speakers will be some modded Klipsch k402 horns with EV DH1A drivers, and 2 15" woofers (synergy 2 way style)...efficiency is over 100db. I am assuming this means all I need is passive preamp? I can use an unbalanced. Into one side of the minidsp (since I only need 1 side for each). Then I can power whichever amp I want on at the time with my Insteon outlets.

 

[Swerd]

I've been very confused just by the audio-related part of this thread. If I understand correctly:

• The original poster (OP) has a turntable in his living room and a Yamaha cxa5100 AV preamp in another room.
• All his speakers are self-powered; they contain internal amps.
• Presently the OP runs long XLR cables between the AV preamp and the speakers.
• He wants to add an external phono preamp between his phonograph and his AV preamp.
• His AV preamp does have an internal phono preamp, but it requires a short RCA cable run, no more than 4 feet (1 meter) long between the phonograph and the AV preamp.
• Finally he wants to find an external phono preamp with XLR inputs and outputs.

If I recall correctly, a phono pickup cartridge is an unbalanced device. There is no need for or benefit from using balanced XLR cables to connect it to a phono preamp. For the same reason, there is no need for or benefit from using XLR cables between a phono preamp and his Yamaha AV preamp. There are many external phono preamps, with RCA jacks, that will allow the OP to place his phonograph further than 4 feet away from his AV preamp. Many of them cost quite a bit less than $1,000. I don't see any reason why that wouldn't work well for the OP.

I don't have anything to add about the non-audio parts of this thread. I do agree that the original poster may be wrong about the danger of electromagnetic fields. I also understand that the life-threatening nature of his heart disease may have influenced his thinking and led him to some very unusual conclusions. As a result, I doubt anything we say here will change his mind.

 

[ellisr63]

I've been very confused just by the audio-related part of this thread. If I understand correctly:

• The original poster (OP) has a turntable in his living room and a Yamaha cxa5100 AV preamp in another room.
• All his speakers are self-powered; they contain internal amps.
• Presently the OP runs long XLR cables between the AV preamp and the speakers.
• He wants to add an external phono preamp between his phonograph and his AV preamp.
• His AV preamp does have an internal phono preamp, but it requires a short RCA cable run, no more than 4 feet (1 meter) long between the phonograph and the AV preamp.
• Finally he wants to find an external phono preamp with XLR inputs and outputs.

If I recall correctly, a phono pickup cartridge is an unbalanced device. There is no need for or benefit from using balanced XLR cables to connect it to a phono preamp. For the same reason, there is no need for or benefit from using XLR cables between a phono preamp and his Yamaha AV preamp. There are many external phono preamps, with RCA jacks, that will allow the OP to place his phonograph further than 4 feet away from his AV preamp. Many of them cost quite a bit less than $1,000. I don't see any reason why that wouldn't work well for the OP.

I don't have anything to add about the non-audio parts of this thread. I do agree that the original poster may be wrong about the danger of electromagnetic fields. I also understand that the life-threatening nature of his heart disease may have influenced his thinking and led him to some very unusual conclusions. As a result, I doubt anything we say here will change his mind.

You are correct. A big question I had was to find a phono preamp with a volume control, and whether or not I would need something with gain to drive the powered speakers. I have a Art phono preamp which sounds better than my Yamaha phono stage. It appears all I need is a passive preamp or a phono preamp with volume.