Comments on: Collins 30S-1 http://k5dkz.com/blog/2006/10/17/collins-30s-1/ Ham radio projects and a log of interesting experiences Sun, 27 Jul 2008 00:28:25 +0000 http://wordpress.org/?v=2.5.1 By: admin http://k5dkz.com/blog/2006/10/17/collins-30s-1/#comment-3032 admin Fri, 29 Jun 2007 16:37:53 +0000 http://k5dkz.com/blog/2006/10/17/collins-30s-1/#comment-3032 I was getting 700 watts out on CW key down. At the time it was running off a heavily loaded 120vac circuit. It was being driven by a 100 watt output IC-737 but it did not need anywhere near 100 watts to get full output. There is a slight modification out to increase the screen grid voltage to the 4CX1000. As originally designed the screen voltage to that tube was reduced to keep the amp within the 1kw limit. Now that we can run more power that screen voltage may be increased to run more power. OF course in order for that to work, you need to have the input power available. Such availability may need running off 220vac. I was getting 700 watts out on CW key down. At the time it was running off a heavily loaded 120vac circuit. It was being driven by a 100 watt output IC-737 but it did not need anywhere near 100 watts to get full output.

There is a slight modification out to increase the screen grid voltage to the 4CX1000. As originally designed the screen voltage to that tube was reduced to keep the amp within the 1kw limit. Now that we can run more power that screen voltage may be increased to run more power.

OF course in order for that to work, you need to have the input power available. Such availability may need running off 220vac.

]]> By: Rene Morris http://k5dkz.com/blog/2006/10/17/collins-30s-1/#comment-3031 Rene Morris Fri, 29 Jun 2007 16:23:11 +0000 http://k5dkz.com/blog/2006/10/17/collins-30s-1/#comment-3031 Hello, Thats a very clean amp. I bought one a couple of years ago and it is all original except someone removed the HV rect fil xfromer, the ceramic sockets, and replaced them with the K2AW (?) microwave oven style diodes. I intend to return it to it's factory condition. I am curious what the SSB power out is when driven as instructed in the manual in fully stock condition. I would think that with the rated 1000 watts input you should get around 600 to 700 watts out. I have not had a chance to run mine yet so I was hopeing you could tell me how yours performed. Any info would be appreciated! Thanks and 73, Rene Morris WR6MTR Hello,

Thats a very clean amp. I bought one a couple of years ago and
it is all original except someone removed the HV rect fil xfromer,
the ceramic sockets, and replaced them with the K2AW (?)
microwave oven style diodes. I intend to return it to it’s factory condition.
I am curious what the SSB power out is when driven as instructed
in the manual in fully stock condition. I would think that with the
rated 1000 watts input you should get around 600 to 700 watts out.
I have not had a chance to run mine yet so I was hopeing you could tell
me how yours performed. Any info would be appreciated!

Thanks and 73,
Rene Morris
WR6MTR

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