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[AMPS] L4B Soft-Start SS-400

To: <>
Subject: [AMPS] L4B Soft-Start SS-400
From: (Will K6NDV)
Date: Wed, 10 Feb 1999 06:21:09 -0800
Isn't the reason to install the SS-400 to save the ON/OFF switch in the L4B?
I have heard some failure stories and also that the switch in not available
any more.

Thanks Will,  K6NDV

-----Original Message-----
From: <>
To: <>
To: <>
Date: Tuesday, February 09, 1999 11:01 PM
Subject: Re: [AMPS] L4B Soft-Start SS-400

>On Tue, 09 Feb 1999 21:42:01 -0500 David Humbertson
><> writes:
>>Hi All,
>>I recently installed the Harbach SS-400 soft-start module
>>in my L4B and would be interested in hearing from others
>>who have done the same. Looks like my tubes may not be
>>fully cutoff as I am seeing a bit of plate current and a small
>>amount of neg grid current in standby - works fine otherwise.
>>My 120 volt line reads 100.3 in SSB with the module in and
>>125 with it out. No one else that I know of has experienced
>Sounds like a defective module Dave.  Besides, why bother using one
>anyway? The L4B PS has sufficient inrush lag as designed, plate and
>filament. If you are using an external heavier duty replacement xfmr then
>switching to 1N5408 diodes in the HV will more than enough handle any
>inrush. Costs less than a failure prone add-on.
>73  Carl  KM1H
>>73, Dave - W3NP
>>Ft. Ashby, WV
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