40khz vs 120khz or 40 plus 120khz US cleaning?

@flemke 

Shapertek is a US company, and the model you list is 11L and total power with heaters is 850W.  Call them on the phone and ask them how much UT power is in the tank.  High Frequency Ultrasonic Cleaner XP-HF-450-11L-120KHz (sharpertek.com)

I know from other people that they will answer the phone and will talk to you.  Note that as the tank volume increases, the amount of power required per liter decreases due to the ratio of tank surface vs fluid volume.  

Otherwise, FYI 40kHz machines are sensitive to record spin speed, and most spinners rotate way too fast. Slowing them down is easy and can improve cleaning - SHNITPWR 30W Universal Power Supply 3V 4.5V 5V 6V 7.5V 9V 12V Adjustable Variable AC/DC Adapter with 5V 2.1A USB Port, 100V-240V AC to DC 3V~12V Converter 0.5A 1A 1.2A 1.5A 2A 2.5A Max with 14 Tips (amazon.com).  The PACVR book addresses the why.

I can give them a call. The spinner I use is set to the lowest speed which is about 8 minutes per revolution.

Your spinner sounds like the VinylStack unit; its the only one I know that can spin that slow - 0.13 rpm. You can spin too slow. Depends on the tank power and temperature. I recently assisted someone who likely damaged a record, but he also allow the tank temp to reach about 125F.

I generally recommend 0.3-0.6 rpm and an even number (no factions) of rotations, so the record sees uniform exposure. 25 min may be a bit long. But this can be affected by how many records you are cleaning at-once and the tank size. General rule of thumb is to space the records about equal to the wavelength, so for 40kHz, 3/4-1 inch is about right.

I don't think it's ever been higher than 35c. I do at the most 20 records and stop. The process gets boring quickly. 

Sharpertek said 450 for Ultrasonic and 400 for the heaters.