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In Reply to: Re: NEED ACOUSTAT PANELS posted by moray james on November 5, 2006 at 11:22:04:
Yes,i think the high frc.tranfourmer also get saturated ezer than low. well u do the mod an let me know what u think. as i siad once the high frc.tranfourmer is no longer satrated the bump in low frc. tranfourmer is now eqel.Now it lot ezer to drive an the high,s are open an exstinded,take all the panel,s out side an wash !BEST MOD EVER thank,s allen like new panel,s
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Capbypass on hi volt bias,an 10m or 250m an chok,s all good mod .As u siad,after i put the 1.5 10w on gronds of hifrc transfourm,s i beleave you have start over .thank,s i well wate to hear from u, Allen
may be a while geting to this. Please send me a PM and that way we can discuss off line when necessary. Regards Moray James.
moray james
thank,s allen 813 977 4798 i can cll u if ok.
just send me a PM. That way we can discuss this off forum. Regards Moray James.
moray james
Will experiment with the resistor on the Hi freq. transformer soon. You are right on about the panels being washed. I have done this myself also. I found (the hard way) you want to be carful about what you wash with though. Detergent will wash a panel well but remember that detergent is conductive. A number of people have used detergent as the conductive coating on their panel diaphragms. So if you use detergent you have to rinse it VERY well to prevent diaphragn static charge from "bleeding" off to the frame. Old panels get coated with cooking oils, fats, smoke and dust over the years and this will be conductive enough to allow charge to "bleed" off the diaphragm resulting in reduced output and strain on your supply. Household solvents like mineral spirits (paint thinner)do a better job and will not leave residue that is conductive. You also want to be very careful with old panels as they do become fragile over the years as the plastiser in the louvre "sweats" out of the styrene plastic with time. Further it is difficult to wash clean the inside surface of the stator panel wires and a good long (multi day) soak immersed in solvent in a big sealable plastic container is your best bet. Just make sure you don't use anything (solvent) with ketones or other solvents likely to attack the styrene itself. So no laquer thinners etc.. There are cleaning solvents that are neutral to plastics and will degrease really well however they are a bit more expensive to use.
At the end of the day I would suggest people simply gear up and build new panels as with Acoustats by this time they are starting to fall apart anyway due to old age. This will gige you the chance to build with 3/8 thick louvre rather than the stock 1/2 inch louvre and to use 3-4 micron film rather than the factory 65 gage HS Mylar. This results in far better bass treble and efficiency.
The choke supply mod (ues ten series wired one Henry chokes)is cheap to do easy to install and makes a big improvement. Well worth the time and effort to do.
You did not say which Izzy Wizzy mod it was you tried. Was it the added supply cap mod? I found this to bump the supply output by about 500 volts and it worked very well for me. Exchanging the stock 500 meg ohm resistor for a smaller ohmic value (say 20 meg ohms) is also a god plan. The older panels really do loose charge as mentioned above and anything you can do to boost it up some helps a lot. You will achieve increased output level as well as improved dynamics. Bass seems to also be better with a little more kick from the suppy. Best regards Moray James.
moray james
The mod was 500mohm cap,it dose what u say,but role down the hi frc.with 1.5ohm 10w on hi frc.transfourmer,sThank,s i well be glad to here from u. just you,sed water,big diff just like u siad
You said "the mod was a 500 meg ohm cap" this does not make sense. Are yoou talking about a resistor or a capacitor and where? Please clairify.
moray james
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