[Amps] [HeathKit_HFAmps] Step Start circuit - needed or not?

[Carl]

It is not necessary but if it makes you feel good then do it. You will also help the economy.........

Many ignore the fact that the power and filament transformers or windings when combined, offer more than sufficient inrush protection. Instead they ignore those items in the calculations.

The SB-1000 requirement was established years ago when the designer stated that inrush was not necessary and only included in later Ameritron amps to satisfy the Nervous Nellies that believe every thing that is published in ham rags by uninformed people. The SB-1000 is an AL-80 clone for the most part and was sold to Heath by Ameritron.

Ameritron also offers parts support even today.

Carl
KM1H




  ----- Original Message ----- 
  From: Chuck Chandler 
  To: amps at contesting.com ; heathKit_HFAmps at yahoogroups.com 
  Sent: Tuesday, February 23, 2010 8:06 AM
  Subject: [HeathKit_HFAmps] Step Start circuit - needed or not?


    
  I'm the new owner of a Heathkit SB-1000 amp, running it on 120 VAC. It is replacing my AL-811. When I bought the 811 I also bought an Ameritron Inrush Current Protector, and have always used it to turn the amp on and off.

  Now with the SB-1000 and reading recent posts on-line, I am wondering if I need the inrush current protector? I am considering installing a step start circuit inside the SB-1000, which will do the same thing... but I am not sure it is necessary.

  I'm reading that the turn-on surge is only likely to really stress the power switch, and the SB-1000 switch is rated at like 18A, well over the normal current, but who knows how high it spikes when the caps are getting that first cycle? And, of course, that's only for a very brief time.

  So, is a step-start of some type really needed? If so, why don't more amps come with it? 

  73 de Chuck, WS1L

  Oak Grove, MS - EM51
  ws1l at comcast.net

  [Non-text portions of this message have been removed]



  __._,_.___
  Reply to sender | Reply to group 
  Messages in this topic (1) 
  Recent Activity: a.. New Members 6 
  Visit Your Group Start a New Topic 
   Switch to: Text-Only, Daily Digest . Unsubscribe . Terms of Use.
   
  __,_._,___