Alternate AC power frequency.. Higher than 60Hz

I have a P300, but don't even use the Multiwaves, just use the sine wave, used to use the P1 setting. I remember when John Atkinson had one he ran his Levinson preamp at 90 Hz. One thing I do appreciate is that until recently I had 126v on the power line. So I could run the P300 at 120v. But we had a major power outage, last month,25,000 in the city, 899, in my area. Yup, they had a robo call after the power came back on telling me it was 899. When I got the multi tester out we were down to 117v. Now you have me thinking it is about time I check it.I did notice when I was pushing the volts up from 117 to 120, it was running even hotter than usual, so I dropped it down to 117v.
Between using a tube preamp, CJ CT5 and a Lindemann 825 DAC with a separate power supply. I just don't feel comfortable with upping the Hz. And years ago when I did try it, I didn't hear any improvements.
Actually they used to recommend it for controlling speed on some turntables, but then you have 3 unused outlets.

The PS audio P1000 like I have can alter the frequency. I did try the higher frequencies to 110 and my Bryston BP 17 preamp got hot. On digital I think it helped some maybe. Does anyone know why a preamp would run hot. It only did that one time and I have had the frequency turned up since but now I'm conerned I could shorten the life of my preamp. Maybe I should call Bryston. They flip flopped on power conditioners years ago saying that they engineered all that is needed to filter out AC line impurities. Now they sell power line conditioners! Lol. I think any manufacturer will tell you don't experiment with the frequency. Why? 1. Because of products being damaged
2. Their product is engineered well enough that a higher frequency has no benefits.
3. They would rather have your stereo dollars go towards buying their products and not someone else's!!!

Hard to say why companies do not want folks experimenting? My guess is they made it and know it does just fine as is, So why fool around, And then folks blame the company when fooling around screws it up! Same for all tweaks. The main place I use the higher frequency had been my old bought $250 used DA, and the $40 bought used five disc CD changers. Not much money on the table.     
On my own Bryston BP-26 I have not tried the higher Hz AC. but I have tried both 'Technical power'/ balanced power 60V/60V and normal 120V/0V from my Furman conditioner. The balanced power does also make the Bryston a little warmer. and the sound has greater clarity but slightly leaner. vs normal AC.  
                                                            
I have my Marantz Sa-10 connected to the AC via the 'Technical power' 60V/60V from my Furman REF 20i ... this means the HOT line is only 60V but the 'Neutral' line is also 60V (in the same way in US homes 240 is split and is 120V hot and 120V neutral to produce a total of 240V) Some devices have trouble with balanced power. Particularly tube with direct heater (so I have read.. I have no experience, but have run my own tube preamps with balanced power, no problems, just the same slightly leaner cleaner sound with 60V/60V.)

Ok thanks for the input. Ive turned It back down to 60 hz. I do run my amp straight into a 10 ga dedicated line. Aahhh now company gone and I'm going to my music room

I would suggest that if you have a warranty issue, do not tell them about upping the Hz. Just tell them it's not working.