- 1. [Amps] QRO Heat management (score: 1)
- Author: Pat Barthelow <aa6eg@hotmail.com>
- Date: Sun, 9 Nov 2008 09:16:01 -0800
- Common to many discussions, about reliability and life of Ham amplifiers and power supplies, include an aspect where an effort is made to economize and "push" limits of components in hopes of money o
- /archives//html/Amps/2008-11/msg00072.html (8,934 bytes)
- 2. Re: [Amps] QRO Heat management (score: 1)
- Author: "Carl" <km1h@jeremy.mv.com>
- Date: Sun, 9 Nov 2008 13:05:26 -0500
- Pat I cant speak to the latest and greatest overpriced stuff that has very little value added, to me anyway, over something 20-30 years old. Ive been using external muffin fans since the first comput
- /archives//html/Amps/2008-11/msg00075.html (11,340 bytes)
- 3. [Amps] QRO Heat management (score: 1)
- Author: "Rob Atkinson" <ranchorobbo@gmail.com>
- Date: Mon, 10 Nov 2008 11:36:18 -0600
- Heat can be an issue with some ham amps built over the past 30 or 40 years (can't say that about all of them since I have not owned all of them). There are several reasons for this. When SSB became t
- /archives//html/Amps/2008-11/msg00093.html (8,354 bytes)
- 4. Re: [Amps] QRO Heat management (score: 1)
- Author: "David Cutter" <d.cutter@ntlworld.com>
- Date: Mon, 10 Nov 2008 10:28:30 -0800
- Not sure if the obvious it has already been stated, but a crucial point is that the cooling air must be directed in the right place and that is quite tricky. Tubes with their own ducted fans and chim
- /archives//html/Amps/2008-11/msg00094.html (7,823 bytes)
- 5. Re: [Amps] QRO Heat management (score: 1)
- Author: "Carl" <km1h@jeremy.mv.com>
- Date: Mon, 10 Nov 2008 17:24:27 -0500
- What many also forget or are too young to realize is that many of the older amps were built when the power was FCC regulated as 1000W CW and 2000W PEP SSB INPUT. Those full legal power amps had a CW/
- /archives//html/Amps/2008-11/msg00105.html (10,778 bytes)
- 6. Re: [Amps] QRO Heat management (score: 1)
- Author: "Roger (K8RI)" <sub1@rogerhalstead.com>
- Date: Mon, 10 Nov 2008 18:33:16 -0500
- Ahhh... I don't remember any PEP limit on input. Just 1KW average based on a plate current meter with a 1/4 second time constant. My voice characteristics are such that I used to get over 2KW PEP out
- /archives//html/Amps/2008-11/msg00111.html (12,600 bytes)
- 7. Re: [Amps] QRO Heat management (score: 1)
- Author: "Carl" <km1h@jeremy.mv.com>
- Date: Mon, 10 Nov 2008 19:33:04 -0500
- Ahhhh yerself. I take it then that you have never bothered to read the SB-220 front panel or the tuneup procedure in the manual. Or the NCL-2000, SR-2000, Hunter Bandit 2000's, and many others. The m
- /archives//html/Amps/2008-11/msg00112.html (15,386 bytes)
- 8. Re: [Amps] QRO Heat management (score: 1)
- Author: "Roger (K8RI)" <sub1@rogerhalstead.com>
- Date: Mon, 10 Nov 2008 21:36:06 -0500
- But prior to the clarification the reg was only 1 KW average input. Even with the 1/4 second time constant I don't remember the reg stating any PEP limit. Right. I ran mine at "tilt" and never had a
- /archives//html/Amps/2008-11/msg00115.html (17,085 bytes)
- 9. Re: [Amps] QRO Heat management (score: 1)
- Author: "Carl" <km1h@jeremy.mv.com>
- Date: Mon, 10 Nov 2008 23:09:59 -0500
- They never came out that way to the general public. It was implied by the time constant and average 60% plate efficiency. That was in the letter they sent back. The DTR-2000 is possibly the most poor
- /archives//html/Amps/2008-11/msg00116.html (19,933 bytes)
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