Vacuum Record Cleaner Rreplacement

@ljgerens Re higher temp, in general grease (fingerprints) dissolves easier at higher temperatures, very simple kitchen experiment with a frying pan will show that. Same with salts. Concentrations of those are so low when cleaning records that temperature-dependent solubility products are of no concern.

Warpage is a red herring, as explained above. 

Don't know what "CMC minimum" is.

Re surface scum forming, have not noticed that. May also depend on the particular soap that is used. I just use a few drops of ECOS dish soap. And no, I don't measure. All those special vinyl solutions, go for it, but I don't find it necessary. Tried some, one I once bought, one that came with the Pro-ject vacuum, cannot tell the difference, so cheaper it is. I am very pragmatic that way.

The ultimate test is how it sounds on my TT, a Rega Naia with Aphelion II cartridge, so should be pretty revealing. I don't hear a thing [aka black background] when I play my thus cleaned records. It is not possible to reduce noise further if there is zero. Don't fix what ain't broke.

That's just what works for me. 

@richardbrand To be sure, there is music when playing my records.  And in the breaks between tracks, nothing. If I would turn it up silly loud, I would likely get some tube noise. So nothing above tube noise floor. As for TT, Rega Naia with Aphelion 2, rest of system is in AG virtual system.

You were correct, RO = Reverse Osmosis, TDS: total dissolved solids as measured by conductivity at 70 ppm. Essentially good soft water, but not as aggressive as DI (deionized) or DD (double distilled) water. Cleaning records does not need the same purity levels as PCR (polymerase chain reaction). As I said before, we play our records in a normal house, not an ISO cleanroom. Accordingly, atomic-level cleanliness is pointless and is ruined as soon as the record comes in contact with room air. Same goes with 100% ethanol, which is actually very difficult to maintain. We used that in Transmission Electron Microscopy preparations, and then the EtOH bottle had molecular sieves in it to bind the water that was being attracted from room humidity. 

Thanks for micelle formation. Focus on that only applies to hydrophobic contaminants (grease). It is irrelevant for salts and hydrophilic contaminants. Again, focus on micelles misses the larger picture. Sounds important if someone doesn't know what it means and understands the limitations.

It seems to be very difficult for people who have not dealt with situations where cleanliness really matters to put record cleaning into perspective. Some cleaning yes, US helps, all the rest most likely does not matter that much. And records are played in a pretty dirty environment (homes).

@oberoniaomnia 

I will have to find a dealer with a Rega Naia and have a listen!  I have been trying to get a copy of the book at under A$110, but the first dealer the Rega distributor sent me to had no idea there even was a book!

Almost every demo I have been to at HiFi shows where vinyl is being played uses jazz tracks which have nothing like the dynamic range of 'big' classical music like Mahler's second symphony, which varies from off-stage murmurs to hundreds of singers and musicians at full throttle, plus an organ which I did not notice at the actual performance but is definitely there on the record!.

I have several recent classical recordings, from Hyperion in particular, where the noise floor actually increases in the interval between tracks.  Odd.

Do you have any records that sound particularly free of background noise?

@richardbrand There are two copies of the book on AbeBooks, both likely under A$110. If you consider to buy a Naia, the book is a rounding error. Re auditioning, good luck with that! I bought mine unheard. No regrets.

I'm not a classics person, more new wave - electronica, and then HIPP baroque. For the latter there is nothing on vinyl, only CD. The closest to big dynamic range classics is the recent Laibach record "Alamut", contemporary classics with Iranian symphony orchestra. 

@oberoniaomnia 

Re higher temp, in general grease (fingerprints) dissolves easier at higher temperatures, very simple kitchen experiment with a frying pan will show that. Same with salts. Concentrations of those are so low when cleaning records that temperature-dependent solubility products are of no concern.

What you state is true. However in an ultrasonic bath, the bath temperature, (within the range suitable for vinyl records) has little effect on the overall cleaning efficiency. In a water only ultrasonic bath, the effect of cavitation will remove most contaminants and the addition of a suitable surfactant will improve the efficiency of the process even at room temperature. The cavitation process itself produces high localized temperatures. So there is no need to run the ultrasonic bath at excessive temperatures when cleaning records. At elevated temperatures, the chance of inducing damage to the record is greater than any improved contaminant removal.

Don't know what "CMC minimum" is.

CMC stands for Critical Micelle Concentration. For many surfactants, a plot of CMC vs solution temperature results in a U shaped curve. The CMC decreases as the solution temperature increases, reaches a minimum and then begins to increase. For some surfactants, this minimum occurs between 40 and 50 degrees C. So operating at the minimum CMC temperature requires using less surfactant.