[Amps] Clipperton-L question

[Carl]

What was done likely before you were a ham was simply the way it was back 
then.
Lots of WW2 BC-375 switches were used to switch HV taps even on commercial 
gear. Dentron just chose a cheaper way which usually didnt cause a problem 
for 10+ years. The higher line voltages dont help.

Carl
KM1H


----- Original Message ----- 
From: "Louis Parascondola" <gudguyham at aol.com>
To: <w6nws at arrl.net>; <amps at contesting.com>
Sent: Thursday, September 12, 2013 8:01 AM
Subject: Re: [Amps] Clipperton-L question


> Just because  "they all do it" doesn't make it right.
>
>
> ##  No its not.  Alpha did the same for years..at least a long tine ago on
> their
>
>
>
>
>
> -----Original Message-----
> From: Larry <lknain at nc.rr.com>
> To: amps <amps at contesting.com>
> Sent: Thu, Sep 12, 2013 7:09 am
> Subject: Re: [Amps] Clipperton-L question
>
>
> The amp groans quite a bit when first powered on of course. I never 
> noticed
> any surge in the sense of "groaning" or lights dimming when going from CW 
> to
> SSB. That doesn't mean it's not there just something I never noticed and
> certainly not as obvious as a power on.
>
> 73, Larry  W6NWS
>
> -----Original Message----- 
> From: Jim Thomson
> Sent: Thursday, September 12, 2013 12:58 AM
> To: amps at contesting.com
> Subject: [Amps] Clipperton-L question
>
> Date: Wed, 11 Sep 2013 18:37:25 -0700
> From: Richard Solomon <dickw1ksz at gmail.com>
> To: "amps at contesting.com" <amps at contesting.com>
> Subject: Re: [Amps] Clipperton-L question
>
> I actually had to check the schematic ... I couldn't believe they switch
> the
> HV side of the Xfmr, but they do.
>
> That's a terrible design.
>
> 73, Dick, W1KSZ
>
> ##  No its not.  Alpha did the same for years..at least a long tine ago on
> their
> smaller desk top amps.  They used an OPTIONAL $80.00  spdt vac relay
> to do the job.   Of course nobody bought the optional vac relay...and just
> wired it
> permanently in the SSB-higher B+ position.
>
> ## The real trick is that when you switch from CW to SSB,  your typ step
> start  circuit
> is non-functional..and u get one helluva surge.  On my HB B+  supply, with
> the 253 lb
> Dahl xfmr, I use a multi-tech industries  model 88 switch, 13 kv rated, to
> change the various HV sec taps.
> Even then, I have to 1st shut off the 240 vac primary, then change the sec
> taps, then turn the B+ supply
> back on.  Then it goes through its normal step start sequence.
>
> ##  Now if going from a higher B+   to a lower B+... there is no need to
> shut off the supply.   I have loads
> of sec  taps on the big dahl xfmr...and all that is required is to grab 
> ANY
> two sec taps.  IE: Its tapped at
> 0-2300-3900-4800-5200 vac.    Since I don’t have a 2900 tap... what I do 
> is
> use the 5200 + 2300 taps.
> 5200-2300 =  2900 vac.  Problem solved.   To pull that off I used a 2nd
> model 88 switch.   On switch
> is wired to half the sec taps...and the 2nd switch is wired to the other
> half of the sec taps.
>
> ##  On my other HB  B+  supply, that uses a 10 kva, 4800 vac  pole pig
> xfmr... I used a
> DPDT relay....with all contacts in parallel, to handle more current.... to
> toggle between
> one hot leg of the 240 line...and neutral.   That way I can  stuff either
> 120 OR 240 vac into the
> 240 vac primary.    That results in either  the full 6800 vdc... or  3400
> vdc.
>
> ##  To get around the step start issue,  I used a SPDT- CENTER OFF type of
> toggle switch to
> switch back and forth between  6800-3400 and 3400-6800.   When passing
> through the CENTER OFF
> middle position of the SPDT toggle,  the step start timer drops out, and
> also the big relay that
> does the actual shunting of the step start resistors.   That way, whether 
> it
> switchs from low to high,
> or from\high to low, the step start circuit always does its thing.   I 
> used
> the spare set of contacts
> on the dpdt 0-15 sec timer module, to  run the amp key line in and out of.
> That way, during the 15 sec
> step start sequence, the amp cant be keyed.
>
> Later... Jim   VE7RF
>
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