ljgerens
Responses from ljgerens
| The "Very Best Record Cleaning Formulation" @mijostyn As I stated in a previous post these perfluoropolyether lubricants are typically only a few nanometers thick. Assuming the LAST record preservative is a similar thickness, you would not be able to see it on your slide. | |
| The "Very Best Record Cleaning Formulation" @mijostyn I never stated an opinion regarding the LAST record preservative. I have never used it or analyzed it. I only stated what they claim in their patent and brochure for your information regarding its chemical composition. You stated this ... | |
| The "Very Best Record Cleaning Formulation" @mijostyn I have no association with LAST and I have never used it. I am just posting what I found on one of their patents and one of their brochures at the Consumer Electronics Show (CES) 1982. One of the patents that I found was issued to Wal... | |
| The "Very Best Record Cleaning Formulation" @mijostyn Regarding your use of brake cleaning fluid on records. I have no idea what brake cleaning fluid you used, but I have only seen two types of brake cleaning fluid. Chlorinated which typically contain Perchloroethylene, Methylene Chloride... | |
| The "Very Best Record Cleaning Formulation" lewm posted "Have you identified molecules that elute with IPA? In this regard, is ethanol safer? Thx." @lewm The main additives diffusing to the surface with concentrated alcohols were identified as plasticizers as well as some stabilizers, scav... | |
| The "Very Best Record Cleaning Formulation" @lewm I can’t put a specific number on dilute alcohol solutions but I would think that anything below 25% and exposed for a few minutes should not be a concern. The migration of additives from the bulk to the surface is a common phenomenon in pol... | |
| The "Very Best Record Cleaning Formulation" @lewm Regarding isopropyl alcohol causing damage to vinyl records. My experiments using several surface sensitive analytical techniques have shown that neither isopropanol or ethanol will cause any damage to a vinyl record surface if used in dilut... | |
| The "Very Best Record Cleaning Formulation" I just came upon this thread so I figured I would provide my experience with ultrasonic cleaning of vinyl records. I studied the effect of ultrasonic cleaning of vinyl records back in the late 70s when I built my first ultrasonic record cleaner. ... | |
| Investigating if ultrasound is harming LPs @iopscrl I agree with your findings regarding US cleaning. I believe that your actual time for your LPs exposed to the bath is ~5 min. Typically the bath solution is below the LP label so only about 1/3 of the LP is in the bath at any given time... | |
| Investigating if ultrasound is harming LPs Ok, maybe I should have been more detailed regarding the experiments I did back in the day to determine if US cleaning would cause damage to LPs. I certainly was concerned with this and why I did the experiments on sacrificial LPs before I actuall... | |
| Investigating if ultrasound is harming LPs @lewm, The experiment you suggest is interesting but as I have observed and others every LP that I have cleaned with an US cleaner sounds better after cleaning. The majority of my LPs were purchased new and US cleaning improved the SQ on all of th... | |
| Investigating if ultrasound is harming LPs I actually studied the effect of ultrasonic cleaning of LPs in great detail back in the late 70s when I built my first ultrasonic cleaner. I used a combination of optical microscopy (Olympus Laboratory Microscope at about 10,000X) and Photoelectro... | |
| Brass versus copper binding posts @ditusa, Ok, I should have stated that a silver coating will prevent the underlying copper from corroding, but silver itself corrodes. The company you quoted does say they apply an enamel coating over the silver, which would prevent corrosion. I... | |
| Brass versus copper binding posts @ditusa, Silver does not prevent corrosion. In fact the silver surface is fairly reactive and can corrode fairly rapidly depending on the number of silver atoms on the surface that are not fully coordinated. Unlike copper which oxidizes to the +1... | |
| which is a better speaker Mike, you might want to ask your question on Audiokarma. There are a lot of folks there who have experience with your receiver and both speakers. I will agree with other posters who stated that your receiver should probably be refurbished. |