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Leaving this here for those that might be looking for data on the old school Pro-Tech Chargers.

My first and only hobby grade R/C charger I had back in the day was the 702 model of this.

Thanks for sharing!

I had the 702 as well, that thing was cranking non stop to the point where you could smell it in the house

I drilled holes in the side and bottom of my 701 to give it some cooling help. They would get quite warm. Today I would have put in a cooling fan from a pc or some such.

I still have my original 702. I always wanted the 701. This thing has about a million miles on it. I still use it solely for testing and tweaking brushed motors.

I have acquired a few of these over the years. My charger as a kid was an aristocrat. Still have it. Ironically the new stuff stops working but this equipment still performs perfectly.

THEYTOOKMYTHUMB wrote: ↑Sun Jun 08, 2025 3:24 pm I still have my original 702. I always wanted the 701. This thing has about a million miles on it. I still use it solely for testing and tweaking brushed motors.

I'm curious how you use it to test and tweak brushed motors? Inquiring minds want to know.

You set it to 6 cells, turn the timer on and then connect the battery wires to the motor. I said I do it, I didn't say it's a great idea. I'm sure I'm not the only one here that does this in lieu of buying a dyno. Obviously, you don't get the actual specs of the motor, but you can at least tell if it's running smoothly, and you can tell if tweaks you make improve the RPM by the pitch of the motor running. You can also see how many amps it's pulling on the meter, but I would question the accuracy of that using this method. I quit using mine for anything else, so I just wired it for this. If you're going to use an old bare connector, make sure one wire is shorter than the other to avoid them accidentally touching while the timer is on.

THEYTOOKMYTHUMB wrote: ↑Tue Jun 10, 2025 12:52 pm You set it to 6 cells, turn the timer on and then connect the battery wires to the motor. I said I do it, I didn't say it's a great idea. I'm sure I'm not the only one here that does this in lieu of buying a dyno. Obviously, you don't get the actual specs of the motor, but you can at least tell if it's running smoothly, and you can tell if tweaks you make improve the RPM by the pitch of the motor running. You can also see how many amps it's pulling on the meter, but I would question the accuracy of that using this method. I quit using mine for anything else, so I just wired it for this.

I use my old Hobbico 800 as a power supply for my comm lathe and bruch cutters.

I built a 4 cell pack for my Bud's dyno. I still need a small 12V battery and charger for my Tekin dyno (my pc based power supply isn't strong enough).

Brendan2904 wrote: ↑Mon Jun 09, 2025 8:58 am I have acquired a few of these over the years. My charger as a kid was an aristocrat. Still have it. Ironically the new stuff stops working but this equipment still performs perfectly.

While I haven't had any problems with my Hitec RDX1, I still keep my old Hitec 335 and power supply close by. Those 335's have always been one of my favorites.