[Hallicrafters] Inrush current limiters in vacuum tube equipment.

[Mark Bell]

Remember that putting them in the AC line does not help your plate tranny if
your HV switch (such as in the DX-100B) applies and removes plate voltage.
You should still put another limiter in the plate circuit.

Actually, while limiters in the AC line won't hurt, I doubt they'll do
anything to save tube life.  The warm up time for the rectifiers is a lot
longer (5-7 seconds) than the delay of the thermister.  The benefit you
should see is that it'll go easier on the filter caps, as they see a dead
short on power on.

73 Mark K3MSB

----- Original Message ----- 
From: "Mark Shaum" <k9tr at dtnspeed.net>
To: <hallicrafters at mailman.qth.net>
Cc: "Waldo Magnuson" <magnuson at mac.com>
Sent: Saturday, April 16, 2005 7:36 PM
Subject: Re: [Hallicrafters] Inrush current limiters in vacuum tube
equipment.


> I've retrofitted some of my tube gear with these over the past year.
> The CL-90, 2 amps continuous, serves in most of the receivers.  I tried
> CL-130's rated at 1.5 amps, but the delay is more significant with
> CL-90' with a different cold resistance.  I saved the CL-130's for
> smaller receivers like the S-40 and HQ-110 series.
>
> I've used CL-60's, 5 amp, for the 100 watt class exciters (HT-37).
>
> The limters do run hot.  That's about the only thing to watch for, they
> should be mounted pretty much in the open and not lodged in next to
> other components or wiring.  A side benefit to the heat is that the
> things are absorbing a couple volts of my higher than usual line voltage
> during normal operation.  And definitely wire them AFTER the line fuse.
>
> They are not expensive.  You could buy a whole lot of current limters
> for the cost of one power transformer :) - Mouser tends to be out of
> stock of the higher current versions, I wanted to try a pair of the 16
> amp ones in my SB-220 primaries.
>
> Mark  K9TR
>
>
>
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