[Martin]

Hi all!

I finally have my TLPn & AKSA 100n up and in place,
but I'm getting hum from my local TV cable line.
This is the signal comming into the house.
This is a direct line fed directly to the TV or VCR
from outside. There is no cable box.
If I break the signal the hum is greatly reduced.
Due to the fact that at present I'm using my DVD
player for CDs,all my equiptment is near my
cable lines & TV.
Is this a sheilding problem?
Any suggestions?

Thanks
Martin

[mamsterla]

You probably have a ground loop from the cable TV.  One way to fix it is with a video isolation transformer.  A good one is from Jenson - VRD-1FF

http://www.jensen-transformers.com/iso_vid.html

Take a look and see if it works for you.

[AKSA]

Martin,

How's that hum coming along?

Is it healthy, or have you killed it?

It seems an isolating transformer with no low frequency response is the trick here;  I see a number of people think it's an earth loop and I agree with them.

Cheers,

Hugh

[Martin]

Thanks for the imput guys.

 Looks like I have 3 choices:
1. Buy the Jenson - VRD-1FF...$50.00...ouch!
2. Build one...$50.00 for tools + parts + time = double ouch!
3. Move stereo to secluded part of house and become recluse...hummmm?

...or maybe the more I ignore it... the more it goes away.
 
 Choices...

Thanks
Martin

P.s.  By the way...this is the way music is supposed to sound...real!
Thumbs up Hugh!

[AKSA]

Martin,

Thanks for your post.

Now, let's get smart about this!

A transformer is too expensive.  Never liked them anyway......

TV signals are up around 100MHz and beyond, orders of magnitude higher than earth loop hum.

Why not try inserting a 1nF (that's 1000pF or 0.001uF) ceramic capacitor into the earth braid, so you have cable braid, then connected to the cap, then other side of the cap connected to the input plug?

It's cheap, it might work, and it will certainly stop an earth loop dead in its tracks!

I'm glad the sound is good.  This is very pleasing, Martin!

Cheers,

Hugh

[Martin]

Thanks Hugh
I'll give it a go.
Let you know how it turns out.

Martin

[simbloke]

Martin,
Why not try inserting a 1nF (that's 1000pF or 0.001uF) ceramic capacitor into the earth braid, so you have cable braid, then connected to the cap, then other side of the cap connected to the input plug?

It's cheap, it might work, and it will certainly stop an earth loop dead  ...

This is just what I once did.

I lived in an area where many houses were fed via cables and boosters from one TV ariel. The hum on the coax was enough to trip out my amp if connected to the phono sockets on the TV!

A couple of small capacitors between a coax plug an socket (plus a bit of tin foil and sticky tape!) solved the problem

Sim

[Al Garay]

I just solved a similar HUM problem this weekend. The culprit was the coax input (I recently had a HDTV tuner installed by the cable company). I had a ground loop problem that I solved by using a very inexpensive surge protector which had coax protection. I plugged the output coax from the cable box into the input coax in the power strip and the output coax went into my TV coax input. Problem solved. I can send back the $700 Monster Power line filter which is what helped me to figure out the solution.

Basically you need a ground lifter. The cheapest solution may be an inexpensive Panamax or other brand surge protector with a coax... a lot cheaper than $50.

I have AKSA 100 watt monoblocks currently driving a set of Eton 11.2 towers.

Good luck,

Al

[Martin]

Hi all!
 Well it's better. Don't know if it's totally cured.
What really seemed to help was rerouting the tv cable; stearing it clear
of all power mains and interconnects.
There is however a 0.0001uF cap inline, aluminum foil with sticky tape
and a surge protector with co-ax cable jacks(this is how first noticed the
increase in hum).
 My experience with building the TLPn & 100n watt  was quite
the adventure. Perhaps more on that later...when I get some acceptable
pictures.

Thanks
Martin