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Old 14th November 2010, 03:22 PM   #21
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After about 23h hours of charging:

The formerly dead bass panel is playing again!

Boahhh, what a good luck!

Give me time to listen to music now

Franz
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Old 14th November 2010, 09:01 PM   #22
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Originally Posted by Franz Gysi View Post
To do the measurements, I made a voltage divider 99Meg / 1 Meg and I fed the circuit by 6VAC instead of about 600VAC.
Using a HT probe, I have same ratio but with a load which is much higher at 990+10MOhm.
This is not enough: I get between 4500 and 5000V iso 6000.
Just to give an idea.
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Old 16th November 2010, 04:11 PM   #23
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As more as I am reading about the Nylon coating Quad used, the more I
ask myself what role the relative humidity is playing.

Could it be, that the coating from old panel could dry out completely?

Specially in winter season here in Europe, when the rooms are heated and have low relative humidity.

Nylon is very hygroscopic and this could influence the conductivity.

I could try one day the following, when one of the panels is getting low at soundlevel:

- completely discharge the panel
- open the dustcover
- put a tobacco humidifier for 24h into the panel (small can with holes, saturated with water inside)
- wait another 24 hours
- try again

What do you think about this thesis?

Franz
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Old 16th November 2010, 07:41 PM   #24
oshifis is offline oshifis  Hungary
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I wouldn't open the dust cover. Humidity finds its way through the wooden frame that holds the dust cover, it is just a matter of time. I believed that higher humidity decreases sensitivity due to surface leakage shunt paths. Have you experienced the opposite?
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Old 17th November 2010, 04:31 PM   #25
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Quote:
Have you experienced the opposite?
No no, I was just thinking about my panels and about all this stuff I've read on the net in the last weeks.

I understand, humidity in the frame can produce undesired leakage current.

But some facts about Nylon:

- normally, it does not detoriate, exept when exposed to UV light (maybe a explanation, why the dustcovers are sprayed gray?)
- it is strongly and quickly hygroscopic

So, when you have optically perfect panels, like mine, and if they don't charge (mine do, actually), why not try this hypothesis?

Franz

Last edited by Franz Gysi; 17th November 2010 at 04:43 PM.
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Old 28th November 2010, 09:04 AM   #26
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Hi
I would like to have a pair of these built for me,and need to buy the various parts can anybody give me the exact spec's/part numbers for the parts ?
I went to maplins store with the standard EHT and they said they do not sell parts with that high voltage rating
I would also like to change all the resistors and caps is the transformers as well, but again I need to know what the the min voltage requirements are
could really do with some advise guys
thanks in advance





Click the image to open in full size.

This supply includes neon bulbs, one for the treble panel and for each bass panel one separately.

Immediately after switching on the first time, I have seen the two bass panel bulbs flashing several times with decreasing frequency.

After one or two minutes, no more flashes could be observed.

I turned on music. In the first moment, I thougth having solved the problem: both bass panels where playing at very low level, while the treble panel still was silent.

After 10 to 15 minutes, it was obviously not having solved the problem as the left bass panels gots louder and louder while the other one remaines at very low level.

The treble panel is still charging with a the bulb flashing about once per minute and is playing now at good level.

I give it time to charge till tomorrow. Should the problem with one bass panel not be solved then I will start to investigate the panel and possibly perforate the dust cover to do some measurements.

Franz[/QUOTE]
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Old 30th November 2010, 09:09 AM   #27
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Hello

I purchased the 10nF/3kV caps on eBay. Item-ID 140389963363

The diodes are simply 1N4007 and the resistors standard types.

The tranny does deliver between 600 to 650VAC.

Hope this helps!
Franz
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Old 30th November 2010, 09:42 AM   #28
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Originally Posted by Franz Gysi View Post
Hello

I purchased the 10nF/3kV caps on eBay. Item-ID 140389963363

The diodes are simply 1N4007 and the resistors standard types.

The tranny does deliver between 600 to 650VAC.

Hope this helps!
Franz
The 2.2MOhm can be chosen better than just standard. It has to withstand 750V DC continually.
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Old 30th November 2010, 06:00 PM   #29
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Quote:
The 2.2MOhm can be chosen better than just standard. It has to withstand 750V DC continually.
I agree.

But you could also use two 1.1MOhm in series, standard types in this case.

Franz
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Old 30th November 2010, 07:32 PM   #30
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I've just emailed him to see if he has any more
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