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Old 15th January 2012, 01:52 PM   #21
tvrgeek is offline tvrgeek  United States
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Generators put out REALLY ugly power, so that may tell you nothing.
To prove it is amp forward, just disconnect everything and short the inputs to the amp. Troubleshoot with as little in the system as possible. The mains issue may not even be in your house.

Remember the service agreement from the utility is power to run incandescent bulbs and inductive motors. If you do anything else, it is your problem. Unfortunately, manufactures, even big buck smart ones, make way too many assumptions about the power. If I am paying more than big-box store prices, I expect it to have whatever is need. So,see ESP for the fix, and yell at Threshold! A big honking isolation transformer will fix you right up!
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Old 15th January 2012, 01:58 PM   #22
DF96 is offline DF96  England
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DC on the mains could explain the transformer noise.

RF pickup could explain the hot channel. Try using boring old cheap normal screened interconnects as these may pick up less RF than exotic ones.

Experience has taught me that the fact that two sets of symptoms occur together does not always guarantee that they have a common origin.
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Old 15th January 2012, 02:00 PM   #23
tvrgeek is offline tvrgeek  United States
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How very true DF, how very true.
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Old 15th January 2012, 02:05 PM   #24
Bonsai is offline Bonsai  Taiwan
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Quote:
Originally Posted by seebert View Post
Bonsai:

Yes it's SS as is the Muse (an underrated amp IMHO). I learned a long time ago (much to my cost) not to run a valve amp without a load

(Great website you have there Bonsai - I've bookmarked it to go back later)

Best regards, Mike.
Thanks Seebert!
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Old 15th January 2012, 02:06 PM   #25
seebert is offline seebert  United States
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Thanks to all and Hi to all !!

Quote:
Seems your stuff all blows up at the merest whiff of lightning storms.
Honestly system7 I've never had such problems until we moved out here into the wilderness. Lived in many a major city in different countries and some not so major and never had the d***** problems that I have had here. Pappa's designs are IMHO some of the best but I'm doubting if any system can stay the course out here. Brownouts, blackouts, net-outs, phone-outs, you name it outs. Oh and the cables were done from a DIYaudio post - no bellwire honestly

Hi KandDad:
Quote:
In a normal domestic installation, all the sockets are in parallel. At least they are here in the UK.
Not in this cottage - they tied a rope attached to the wire for the ring mains installation around a rat's neck and then yelled GO !! And it went alright - every which way it could. As I've posted before I've spent hours trying to suss out the wiring here - it was added on to gradually over the centuries to become the nest that it is now. I know the answer of course, all it needs is a time-served electrician and 25K do-it Shekels and we're good to go, but me no got 25K dimes that are loose/handy/available (((

As Andrew and others have said (thank you all) go the DC blocker route (and if I can try a 120 genny first) but it's still a complete mystery to me as to why I hear it now. I have not had my head in the sand for the last few months (honestly) and would have noticed a somewhat suppressed 'machine gun' in the room. And then there's that HF oscillation possibility - but same cables etc etc etc. Baffled and off for a short kip - been at this all night. Thanks again guys, see you later. Mike.

DF96: so right (as tvr agrees) - and I will try doing exactly that also.

Last edited by seebert; 15th January 2012 at 02:11 PM. Reason: Add text for later posts.
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Old 15th January 2012, 02:08 PM   #26
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I personally have no problem with DC on mains in UK.

Is this unusual to the US ?

My Pass Aleph 4 hums slightly, I put that down to the sheer load on the transformers. (Over 800W).

That is mechanical transformer hum not audible supply hum.

It's quieter than the fish tank so I ignore it.
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Old 15th January 2012, 02:14 PM   #27
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Quote:
Originally Posted by seebert View Post
Thanks to all and Hi to all !!



Honestly system7 I've never had such problems until we moved out here into the wilderness. Lived in many a major city in different countries and some not so major and never had the d***** problems that I have had here. Pappa's designs are IMHO some of the best but I'm doubting if any system can stay the course out here. Brownouts, blackouts, net-outs, phone-outs, you name it outs. Oh and the cables were done from a DIYaudio post - no bellwire honestly

Hi KandDad:

Not in this cottage - they tied a rope attached to the wire for the ring mains installation around a rat's neck and then yelled GO !! And it went alright - every which way it could. As I've posted before I've spent hours trying to suss out the wiring here - it was added on to gradually over the centuries to become the nest that it is now. I know the answer of course, all it needs is a time-served electrician and 25K do-it Shekels and we're good to go, but me no got 25K dimes that are loose/handy/available (((

As Andrew and others have said (thank you all) go the DC blocker route (and if I can try a 120 genny first) but it's still a complete mystery to me as to why I hear it now. I have not had my head in the sand for the last few months (honestly) and would have noticed a somewhat suppressed 'machine gun' in the room. And then there's that HF oscillation possibility - but same cables etc etc etc. Baffled and off for a short kip - been at this all night. Thanks again guys, see you later. Mike.

Are you telling me that your domestic installation has a 3 Phase supply ?

In UK the Power Station feeds a 3 Phase supply to a substation. At the substation it is transformed down from 33000V to about 440V 3 Phase.

We then use a single phase of the 400 which is 240V and good for about 40 houses.

A street of 100 houses would share the output of a single substation.

I appreciate thet in the US you use local transformers at the top of poles, but I find it strange that each house would have a three phase feed.

Maybe I'm wrong. We do use use 240V to reduce the current. You use 110V cos its apparently safer.
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Old 15th January 2012, 02:23 PM   #28
Bonsai is offline Bonsai  Taiwan
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3 phase feed into houses is not uncommon in the US. I had a plug wired for 220V so I could run an electric kettle.

DC is a problem in the UK. However, since the US is at 110VAC, the primary is likely to have a lower DC resistance so I would expect that the issue is slightly worse compared to the UK and the rest of EU.

I also think UK/EU regulations regarding AC loads are probably stricter. You would not normally notice this, because its the manufacturers who would come up against this during product qualification.
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Old 15th January 2012, 02:28 PM   #29
DF96 is offline DF96  England
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DC on the mains is caused by someone nearby taking a DC current from the mains (e.g. by directly connected half-wave rectification). That DC current has to come from somewhere. If you are on the end of a local feeder then it could be your toroidal transformer. If you are near the step-down transformer then it will take the DC instead as it will have a lower DC resistance than any domestic item.

In the UK each phase is fed to roughly every third house, so DC is unlikely to be caused by your immediate neighbours but 3, 6, etc. doors away in either direction.
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Old 15th January 2012, 02:28 PM   #30
seebert is offline seebert  United States
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Hi KandDad: no, not three phase just a single messup phase system. I'll take the British 3 pin plug and socket anytime over the 'weeny' US mains plug/socket version - and I'd be very happy with 240V mains. Why choose 120V - for safety reasons - I don't think so. Most probably something to do with cost as it always does I reckon squirrels have a great feed feed from pole-top transformers - and they're really ugly sods too - the transformers - not the squirrels !!

I'll connect up again when I get up and post the results. Thanks again, Mike.

That BIG isolation transformer sounds good too !!!
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