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Old 16th August 2007, 08:58 PM   #251
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Quote:
Originally posted by 7N7

However, the bouquet goes to Electricité de France. I have been monitoring the mains voltage here in the sticks for a week, testing at various times of the day and night. It is supposed to be 230v (same as UK). The lowest I have measured is 229v, the highest 232v.

The English suppliers should hang their heads in shame.

So much for "England, Harry and St George"!

7N7
Australia is also supposed to have moved to 230V (from 240), but the electrical companies managed to have the tolerances widened enough (doubled, if I'm correct) so that nominal 240V is still within legal spec for 230V. I've never seen anything as low as 230V but a wall voltage up near 250 is not uncommon.

Your daily dose of trivia.
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Old 16th August 2007, 10:18 PM   #252
7N7 is offline 7N7  United Kingdom
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Something of a classical education then, Terry? 99% of anything of this kind I learned at school, I am afraid, has been forgotten.

An interesting post and in particular, I liked your comments concerning "off-topic".

I always used to say that my motto was "find a tide and swim against it." Now I am not quite so sure. Perhaps now it is harder to find the energy that was once so conspicuously available!

7N7
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Old 16th August 2007, 10:24 PM   #253
7N7 is offline 7N7  United Kingdom
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Quote:
Originally posted by thevoice


Australia is also supposed to have moved to 230V (from 240), but the electrical companies managed to have the tolerances widened enough (doubled, if I'm correct) so that nominal 240V is still within legal spec for 230V. I've never seen anything as low as 230V but a wall voltage up near 250 is not uncommon.

Your daily dose of trivia.
Yes, it seems that 230v is now becoming the internaitonal norm. In England, certainly up to two years ago, my usual mains voltage was about 235 - 238v sometimes dropping to 231v and sometimes getting up to 242v.

I ordered a couple of tranformers from the excellent Majestic Transformers in Poole in Dorset. Whilst speaking with the chap there, this subject arose. He told me that obviously, for a transformer maker, the mains voltage was of vital importance for testing and so on. In consequence of this, the company had installed a monitoring system. He told me that the highest voltage recorded was 252v whilst the lowest was 219v.

Bearing in mind the money that these organisations make (I mean the electricity suppliers not the transformer makers!) I consider such slackness scandalous.

7N7
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Old 17th August 2007, 04:57 AM   #254
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Quote:
they were more concerned with winning an argument through the dexterity or subtle manipulation of their words, than maintaining or projecting the truth.
Sounds like a good description of the law courts or the political arena!

On the subject of mains voltage, in Indomesia it is nominally 220v @ 50Hz but the distribution systems are in poor condition and are often overloaded. In Jakarta, I've frequently measured mains voltage as low as 190v and the highest I've measured is just less than 230v. I understand, though, that there are other countries where the fluctuations are much worse than this.

Large variability of supply means, for instance, that there's not much point in designing electronic equipment that is sensitive to supply voltage. It also means that if you regulate the screen voltage in a pentode amp that uses fixed bias, then you must also regulate the bias supply. However, that does not guard against problems due to variations in the tubes' heater supply. You can buy boxes to help regulate the supply but many of those are noisy.
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Old 17th August 2007, 06:37 AM   #255
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Quote:
Originally posted by 7N7


I ordered a couple of tranformers from the excellent Majestic Transformers in Poole in Dorset.

7N7
This is a transformer manufacturer worth every grain.....thev'e done an excellent job of my mains and output transformers. There are others still around but not worth mentioning.

It was only by chance I opened this mail and spotted the reply from 7N7 ...I've gotton rather tired of all this language correctness that is for an audio forum really classed as "spam" and automatically goes into the "delete" bin. There are so many spelling and grammatical checkers on the websites and personal computers which really leave no excuse for errors. Lazyiness!

richj
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Old 17th August 2007, 07:56 AM   #256
Dworin is offline Dworin  Malaysia
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Quote:
Originally posted by pinkmouse


Surely, "I debarked from the omnibus".

al/ I am the one in ten, a number on the list...
I haven't made it to the end of the threat (oops) yet, but I find it interesting that people are so apologetic on others' behalf. It was mentioned that French abuse their language in sms/forums and I can definitely assure you the same is true for Dutch and Malay, and most likely for any other imaginable (and unimaginable) language.

I now wish I hadn't deleted an sms-corresponce I had with a local student about her grade. It kept me occupied during the holiday, which I didn't mind since I like puzzles and riddles.

Anyway (an oft-abused sentence opning, at least overhere), I wanted to comment that daily I listen to a message in the station asking me to wait for passengers to disembark before boarding. And yes, push-pull does acquire a wholly new meaning in public transport.

Also, triggered by the 'off of', I have a long-stanfing disagreement with my wife on whether the song is or should be 'I can't get my eyes off you' or '...off of you'.
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Old 17th August 2007, 08:12 AM   #257
7N7 is offline 7N7  United Kingdom
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Quote:
Originally posted by richwalters

This is a transformer manufacturer worth every grain.....thev'e done an excellent job of my mains and output transformers. There are others still around but not worth mentioning.

It was only by chance I opened this mail and spotted the reply from 7N7 ...I've gotton rather tired of all this language correctness that is for an audio forum really classed as "spam" and automatically goes into the "delete" bin. There are so many spelling and grammatical checkers on the websites and personal computers which really leave no excuse for errors. Lazyiness!

richj
Rich:

Yes indeed; and a very good service.

I once showed some 10kHz square waves from one of my amplifiers (with a Majestic output transformer) to a chap who immediately asked "Who made the output transformer?"!

And talking of spell checkers etc., was that "gotton" or "gotten"? And "lazyness" or "laziness"?

And where in the Alps are you?

7N7
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Old 17th August 2007, 11:41 AM   #258
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A minor distraction from this thread:
Ciao,..7N7, which amp circuits appeal to you, P-P SE or do do you like high power challenges ?
If in a position to take a photo of that 10Khz sq wave at rated power then be interested to see it.


richj
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Old 17th August 2007, 11:53 AM   #259
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Quote:
Originally posted by richwalters
A minor distraction from this thread:
Ciao,..7N7, which amp circuits appeal to you, P-P SE or do do you like high power challenges ?
If in a position to take a photo of that 10Khz sq wave at rated power then be interested to see it.


richj

Hello.

Very brief history: I was active building amps etc., from 1997 to 2005. (I had done things electronic before but not so intensively).

Employer went bust (in England this was) so I sold up and cleared out. At present most of my stuff is on paper - mostly for financial reasons.

I prefer p-p and all differential pairs where possible. I am in this mainly because I love valves. The first amp was a p-p 813 triode strapped of course. The square waves were from a p-p 13E1 amplifier. Running only 280V HT or thereabouts, it made 33W just before clipping (about 3%THD) At 24 watts distortion was better but I cannot remember the numbers - certainly better than 1% with no feedback.

My particular interest is in triode strapping RF beam tetrodes and also frame grid pentodes. I made some sets of triode curves for some of these and also tested one or two for distortion.

I do have a trace of the square waves but I am away at present. Will send in due course.

7N7
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Old 17th August 2007, 03:05 PM   #260
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Quote:
I prefer p-p and all differential pairs where possible.
Ah, a man of taste! My own favourite, right now, is a 6SL7 LTP splitter with pentode CCS in the tail, followed by 6SN7 diff driver, and trioded EL34s in the output. NFB is cross-coupled from OP tube plates to 6SL7 plates. No hum or noise whatsoever! I think that configuration may possibly not have enough gain for pentode mode, though, because of the heavier NFB required, but I'd like to try it.
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