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1. [AMPS] Collins 30S1 Improvements (score: 1): Author: philk5pc@connect.net (Phil Clements); Date: Sat, 12 Apr 1997 20:59:50 -0500; The most popular mod. is to raise the screen voltage to 325 volts. This is easily done by adding a small 100 watt isolation transformer 115v/115v in series with the winding on the screen supply trans; /archives//html/Amps/1997-04/msg00161.html (7,286 bytes)
2. [AMPS] Collins 30S1 Improvements (score: 1): Author: philk5pc@connect.net (Phil Clements); Date: Sun, 13 Apr 1997 09:34:30 -0500; The a.c. voltage to the screen supply is increased by adding 115v to the normal supply voltage obtained from terminals 10 and 11 of the main power transformer. A 100 watt 115/115 volt isolation trans; /archives//html/Amps/1997-04/msg00171.html (7,926 bytes)
3. [AMPS] Collins 30S1 Improvements (score: 1): Author: philk5pc@connect.net (Phil Clements); Date: Mon, 14 Apr 1997 22:18:39 -0500; This is not my mod...it was published years ago by my friend John Adel, W5RR. Readjusting the bias and tuning meter calibration after raising screen voltage to 300v: Turn the bias adjust control full; /archives//html/Amps/1997-04/msg00190.html (8,275 bytes)

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