Thumbs up for ultrasonic record cleaning

@ktimothyaI
I have been seeing 45C used in this thread, now you tell me 40C is too hot, I don’t understand 

Yes my tank is 40khz, I’m thinking of building an enclosure of panel insulation to mute the noise, it is kind of annoying 

@slaw 
mine is admittedly an inexpensive Chinese tank, when I was looking to buy noise was unfortunately not a detail I considered

j_damon

... I’m thinking of building an enclosure of panel insulation to mute the noise, it is kind of annoying

Yup, US cleaners do make an annoying racket. Klaudio sold a dampening cabinet for its cleaner. Very effective!

@jtimothya 

Don't see why a mixture of frequencies should be better. There was a graph posted in the DIYAudio thread of cleaning efficacy vs frequency. For gaps the size we see on records, 40KHz is only marginally superior for the largest gaps, and quite inferior for the smallest. This mirrors my experience.

IMO, 40C is low - only a touch above body temperature. I often start a session with a temperature in the low 40's, but continue to begin 15 minute runs until the temperature hits 47C, when I wait for the chemistry to cool a bit. I acknowledge that it can be disconcerting to see your vinyl come out of the tank a little warped, but with uniform cooling in the rinse stage, the warp disappears. At least in my experience, by my standards. I use a 60RPM Vinyl Stack and running purified water for rinse.

Are you sure that your thermometer is accurate? And that it is monitoring the relevant temperature? Stir the chemistry vigorously - if the temp reading changes, then your tank is not homogenizing the chemistry and hot spots or cold spots may emerge with use. That could be affecting your perceptions of appropriate temperature. Hope that helps.