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[Amps] Fw: {Collins} 30S-1

To: <>
Subject: [Amps] Fw: {Collins} 30S-1
From: "Gary Smith" <>
Date: Wed, 21 Oct 2009 11:42:54 -0700
List-post: <">>
----- Original Message ----- 
From: Gary Smith 
To: Carl 
Sent: Wednesday, October 21, 2009 11:05 AM
Subject: Re: [Amps] {Collins} 30S-1

I had one that was on loan to me for a couple of years. after dealing with the 
known relay problems and getting them somewhat cured, all was well until one 
day in the middle of a QSO my signal fell off dramatically.  
Seems that both fuses on the control board had gone south, which led to a guess 
ht the tube's grid had shorted out against the interior of the tube. As I did 
not have a spare to test with, I returned it to its owner who told me that was 
why he had loaned it to me.
"Too many ongoing hassles," he said.  All would probably agree that it was a 
good amp for the Po (continuous until hell freezes over, etc) in its day, but 
newer and more modern amp designs and tube developments have superseded it by a 
long shot.
  ----- Original Message ----- 
  From: Carl 
  To: kingwood ; Amp Reflector 
  Sent: Tuesday, October 20, 2009 5:07 PM
  Subject: Re: [Amps] {Collins} 30S-1

  Which are all reasons why I have never had any interest in owning one.

  My experience is limited to repairing maybe 5 and converting 6 to 6M 
  monobanders where they have a better chance of reliability.


  ----- Original Message ----- 
  From: "kingwood" <>
  To: "Amp Reflector" <>
  Sent: Tuesday, October 20, 2009 6:07 PM
  Subject: [Amps] {Collins} 30S-1

  > Greetings to all,
  >        There is some misinformation  being passed out here about these
  > tubes.  There are two common 4CX1,500 tube types, the "A", and the "B". 
  > The
  > "A" tube has a 25 watt grid dissipation rating but will not work in the
  > 30S-1 without changing the tube socket.  The "B" tube has a 1 (one) watt
  > grid dissipation and will directly replace a 4CX1,000 in a 30S-1 amp.  As 
  > I
  > said in an earlier post, this is a X 10 increase in grid dissipation over 
  > a
  > 4CX1,000.
  > .
  >        It is important to know, and understand, that the band switch in 
  > the
  > 30S-1 was never intended to see more than about 600 watts of RF.  This amp
  > was designed at a point in time when US Amateurs were only allowed to run
  > 1,000 watts AVERAGE INPUT power, not OUTPUT.  This band switch is made on 
  > a
  > thin sheet of G10 fiberglass with contact points riveted on.  My point is,
  > be careful how you handle this switch, both power applied and switching. 
  > I
  > had to pay $500 for the last one I changed out for an RTTY operator.  In 
  > my
  > opinion, the 30S-1 should never be operated on any continuous mode.  High
  > speed CW is also very hard on it.
  >        Despite the other numerous faults with this amp, it is still around
  > and quite a topic of conversation.  Ask yourself why has it not increased 
  > in
  > value comparable to other similar amps.  If you ever had to maintain a
  > "fleet" of these amps, as with the MARS program, you will understand why.
  >        I have a 30S-1 with grid drop-out mod, fused step-start,  and
  > 4CX-1,500 with increased screen voltage.  With these mods, it runs 
  > reliably
  > in SSB but I still cringe every time I turn it on -- so many more bad
  > things, than good things,  can happen every time it is turned on.
  > 73 de Lon, K5JV
  > 1110 Golden Bear Ln.
  > Kingwood, TX 77339
  > 281-358-4207
  > 281-358-4234 FAX
  > 281-795-1335 CELL
  > _______________________________________________
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