[AMPS] L4B Soft-Start SS-400

[km1h@juno.com]

On Wed, 10 Feb 1999 06:21:09 -0800 "Will K6NDV" <k6ndv@contesting.com>
writes:
>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

After 20-30 years switches fail but not as frequently as some of the soft
start circuits.An amp turn-on failure is usually sufficient reason for
serious cussing.
I have a few hundred rocker switches from the NCL-2000. Folks tell me
they fit in the Drake and SB-220.


73  Carl   KM1H


>
>-----Original Message-----
>From: km1h@juno.com <km1h@juno.com>
>To: amps@contesting.com <amps@contesting.com>
>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
>><daveh@hereintown.net> 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
>>>this.
>>
>>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
>>>
>>>
>>>
>>>--
>>>FAQ on WWW:               http://www.contesting.com/ampfaq.html
>>>Submissions:              amps@contesting.com
>>>Administrative requests:  amps-REQUEST@contesting.com
>>>Problems:                 owner-amps@contesting.com
>>>Search:                   http://www.contesting.com/km9p/search.htm
>>>
>>>
>>
>>___________________________________________________________________
>>You don't need to buy Internet access to use free Internet e-mail.
>>Get completely free e-mail from Juno at 
>http://www.juno.com/getjuno.html
>>or call Juno at (800) 654-JUNO [654-5866]
>>
>>--
>>FAQ on WWW:               http://www.contesting.com/ampfaq.html
>>Submissions:              amps@contesting.com
>>Administrative requests:  amps-REQUEST@contesting.com
>>Problems:                 owner-amps@contesting.com
>>Search:                   http://www.contesting.com/km9p/search.htm
>>
>>
>
>

___________________________________________________________________
You don't need to buy Internet access to use free Internet e-mail.
Get completely free e-mail from Juno at http://www.juno.com/getjuno.html
or call Juno at (800) 654-JUNO [654-5866]

--
FAQ on WWW:               http://www.contesting.com/ampfaq.html
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm