High Voltage Power Supply

[PapaZulu]

Hello all. I am having a pretty hard time finding the least bit of info on this unit. I am told it by the person I picked this up from that it is Motorola gear. He gave me a rack mount panel with meters that supposedly went with this supply. The meters all say Motorola. The actual supply doesn't have any Motorola on it. On the inside of the supply it has the numbers 63E81003E16 ( serial # I assume) then below it is TPN1041B (Model #?) It is dated 1974. I've tried to google the numbers with out luck. I don't know where to look now.The supply weighs about 120 pounds. If anyone can point me in the right direction I would greatly appreciate it.










Thanks,
JiM

[DJP126]

This is a Motorola power supply. TPN1041B is the model number. The 63E number is a part number (probably for the sheet metal piece). Being from 1974, if there is a serial number the structure of the serial number would be 2 letters 3 numbers 1 letter or 2 letters 4 numbers. Unfortunately, I never got into the infrastructure equipment, so I don't know what it was used for.

[ai4ui]

It's the high voltage supply for a 250 watt tube amp. I have a VHF assembly that would go great with your power supply if you are interested in it. Be careful with this thing, it can create a whole lot more voltage that you want to play with.
Robert

[k2hz]

It is the HV power supply part of a Motrac high power base, probably 250W. I don't have documentation on that particular model but a similar appearing TLN6950 provides 1500VDC at 600ma and 300VDC for the exciter and -40 and -15VDC for bias.

[PapaZulu]

Thanks a bunch guys! I'm hoping with a little work I will be able to get it to work with an old Mastr GE Tube amp. 1x 4CX250B. I think it will work pretty good with a couple variacs and a few other bits.

Thanks again,
Jim

[George]

Why would you want to do that?

Call those folks up in NH that have those repeater controllers and they have all of the pieces to do what you want. They were advertising the parts on Ebay for $20.00 each.

You need the power supply and the controller module. Bolt those two below the power amp and make about two dozen connections are you are done.

OR

If you are into the less painful route, try ebay for the MastrII base stations that are already built and in a cabinet. They are $200.00 or less. IF you don't want to pay shipping, get them to pull them out of the cabinet and ship.

But to make a freakenstien is dangerous and unmanageable in the long run. You will be happiness and painlessly ahead.

Only my opinion...If you want to rebuild the wheel, God bless you and have at it.

Stay safe.

George

[PapaZulu]

Well George, I'm not completely sure who those folks up in NH are. If you could please tell me a bit more that would help.Also, I'm not building the amp for FM use so I don't think the Mastr II is going to be of much use for me.I'm not in the basement with a handful of wire nuts trying to put this together.I have schematics of the supply I am building and a very experienced retired EE for assistance. I was just trying to get some specs on the parts I have already as to not waste any unnecessary time of my friends. Building is one of the main reasons I enjoy amateur radio or I'm sure I would have bought something ready to go in the first place.



Thanks,
Jim

[Dan562]

I haven't seen one of those Motrac HV power supplies for several years. When looking at the power supply schematic you'll see two Triacs (heat sinked to the front panel) tied to the primary side of the High Voltage transformer. These triacs need to be bias "on" while applying your external PTT circuit so the 121V AC is fed to the transformer generating the HV. These power supplies can produce up to 600 Watts DC Input. With an external variac the factory personnel final tested these at 121V AC +/- 10% primary voltage before leaving Motorola Schaumburg. Wiring in a variac between the Triac outputs and HV transformer primary would allow you to raise the High Voltage without affecting the other Lower Voltage circuitry.

Since you're a ham and I'm not certain whether you plan to use your GE amplifier for FM and SSB, then you'll be required to modify the 4CX250 tube socket lifting one of the grid pins to apply a negative voltage for SSB (Class AB1 or AB2 Linear) operation, refer to the ARRL handbook on RF tube information. Otherwise if you're strictly using the GE amplifier for FM (Class C) all of the circuitry in the amplifier will remain unmodified.

Dan