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Old 27th October 2021, 04:13 AM   #11
perkri is offline perkri  Canada
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Thank you!

I will check it out for sure!
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Old 27th October 2021, 05:32 AM   #12
candersson is offline candersson  Sweden
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You can gently wipe off the dust with a soft brush and a vacuum cleaner ... you don't want to make a tear in the dust covers. If there are any smaller tears, you can apply som capton tape over it.

Then, with the covers secured, look for black burn marks through the back dust covers. Maybe you can spot some, maybe not.

With the dust gone, the AC transformer can be measured. Take care about the high voltages ... over 600V AC and 6kV DC to the bass panels. Treble voltage is about 2.5kV. You might not be able to measure it with a multimeter, but you can take an isolated tool and slowly approach panel voltage terminal, create an arc between panel voltage and ground. 6kV requires about 6mm or less distance. 2.5kV is about 2.5mm. Arcing at 2mm for bass panel indicates a bad supply.

If at all in doubt, don't proceed with this .. it is dangerous.
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Old 27th October 2021, 11:06 AM   #13
perkri is offline perkri  Canada
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Cool, thanks!

Looks like tears in the dust covers have been taped up before.

Also looks like they were stored somewhere less than ideal from the water marks on the dust panels and the rust on the rear grills, although I don’t know if this is a common thing?

I think there is a high voltage probe available for my meter?

Checking voltage as a function of arc/mm is a new one. And the neighbors thought I was crazy arc welding on the porch at midnight in a thunderstorm

This may just confirm it
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Old 27th October 2021, 11:17 AM   #14
candersson is offline candersson  Sweden
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A good HV probe may show the right value, but in many cases the 6kV is shown with a lower value due to the very high impedance of this voltage.

It is a good idea to measure with panels connected and then, if voltage is low, disconnect 6kV first, measure, then 2.5kV, measure.
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Old 27th October 2021, 12:07 PM   #15
perkri is offline perkri  Canada
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Thanks again for the info!
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Old 11th November 2021, 12:38 AM   #16
perkri is offline perkri  Canada
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Hi.

Been searching for some info on what to do about the rear grill and the rotting damping material attached to it. The tweeter felt ones are fine, but the "burlap" is falling apart.

Any thoughts on what to replace that with?

Thanks!
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Old 11th November 2021, 04:34 AM   #17
stokessd is offline stokessd  United States
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I replace it with felt, about 1/16" thick wool. I make it smaller than the original burlap and horsehair pads by a touch since it's less permiable to the air, so I leave more area to leak by. I did some measurements to tune the size, but admittedly, they were pretty crude back when I did them.

Sheldon
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Old 11th November 2021, 04:50 AM   #18
perkri is offline perkri  Canada
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Thanks Sheldon!

There’s a company in Germany that sells ready made ones, but shouldn’t be that difficult to make something.

Off to the fabric store I go!
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Old 11th November 2021, 11:48 AM   #19
lcsaszar is offline lcsaszar  Hungary
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I don't recommend using a vacuum cleaner for removing the dust. I used cosmetic pads soaked with isopropanol. Gently wipe off all dust, especially at the terminals. You can use a small brush too.
Take care of the HV, the panels can keep the charge for a long time. If you want to be safe, discharge them to GND with an insulated multimeter probe wire.
In general, you don't need to measure the HV. If you really want, use a 10Gohms probe, which is not easy to find, and is not worth to buy for only this measurement IMO. If the left, center, right panels sound loud, the dust covers are not torn, and there are no visible burn spots, they are good.
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Old 11th November 2021, 01:23 PM   #20
perkri is offline perkri  Canada
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Thanks!

Have not removed anything from them as of yet - other than the covers. I’ve seen people use vacuum cleaners to remove the dust. I have fears of the covers vanishing into the vacuum in the same way curtains gat sucked into them in comedies

For now, I’m just going to clean them, replace the rear damping material and clean up the solder joints. Then I’ll plug it back in and listen to it.

If it’s still “sizzling”, I’ll replace the EHT board and while I’m at it, add clamp boards.

Panels all look good, dust covers are intact with the odd bit of cello tape
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