[AMPS] Lighter Iron <Price Reduced>

[Lane Zeitler]

This has been reduced to $175 shipped lower 48. There is NO 220/240 vac
option, strictly 120 volts only. The xmfr is not center tapped. Two leads
into the primary at 120 and two leads out of the secondary at abt 4200
volts. See details below.

> I have a power supply out of my Northern Radio Company N542 KW HF amp. The
> amp runs a pair of 3-500Zs (not for sale). The power supply (which is for
> sale) is designed to be bolted into a 19" rack. It uses 120 vac input
only.
> The output is about 4200 volts at 1/2 amp or so. The xmfr output is abt
3900
> volts which goes into a dc filter choke which looks like it is rated at
> around a half amp. There are four oil filled caps which are 4uF 2500vdc
> units, probably series-paralleled. The unit is energized by applying 24vdc
> or 12vdc to the primary power relay. I do not know for sure if it is a 12
or
> 24 volt coil since it energizes on 12 volts just fine. The output is a
> Millen HV connector (just one for the B+, B- must be chassis ground). The
> topside chassis is full of thick dust/light grime. Not bad. With a high
> pressure air hose most of it would clean off. The underside looks perfect.
> It also uses two 25k ohm 225 watt bleeder resistors. I have no scat for
this
> but it is a very very simple design that could easily be traced out by
hand
> and drawn out from reverse. It DOES work. I tested it on my big amp that
> runs a pair of 3-500Zs and with 1350 watts out of the amp the power supply
> dropped to abt 3000 volts. Not super good regulation but considering 120
vac
> line not really bad either. The choke is not resonated. If you did
resonate
> it the regulation would improve significantly.
>
> Also has a fused line cord with a fuse on each side. There is a 8 pin
octal
> socket on the rear of the chassis for relay power and I think there might
be
> 120 volts to one of the pins. I removed the two leads that go to the pri
> power relay so I could verify operation. Otherwise it is totally stock.
This
> power supply is 100% complete and ready to use. No metering at all. The
> front panel is totally blank except for the two fuses. The front panel
looks
> fair, about a 6 or 7 out of 10. It would not be hard to remove the panel
and
> repaint it. If you need a good 4000 volt supply at 1/2 amp to do amplifier
> work then maybe this is a good candidate. It is kind of handy having it
> wired for 120 vac since it is "portable" at abt 75 pounds.
>
> Price is $215 shipped lower 48. Will double box and insure via UPS ground.
>
> 73s
>
> Lane
> Ku7i
>
>
>
>
>


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