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1. [Amps] Grid driven Multi-band amp using 4-1000 (score: 1): Author: Steven J Fraasch <sfraasch@juno.com>; Date: Wed, 19 Jan 2005 09:11:47 -0600; Has anyone successfully built a multi-band grid driven amplifier using a 4-1000 ? If the control grid were swamped in the 50 to 200 ohm range, and the Screen grid was made the shielding element (assu; /archives//html/Amps/2005-01/msg00364.html (7,514 bytes)
2. Re: [Amps] Grid driven Multi-band amp using 4-1000 (score: 1): Author: Steven J Fraasch <sfraasch@juno.com>; Date: Wed, 19 Jan 2005 10:05:23 -0600; Rich: SPICE is very useful (or almost as good, linear 2 port models) for predicting behavior in HF as well as at VHF. The components, such as sockets, chokes, suppressors, large caps and inductors ca; /archives//html/Amps/2005-01/msg00367.html (7,911 bytes)
3. Re: [Amps] Grid driven Multi-band amp using 4-1000 (score: 1): Author: Steven J Fraasch <sfraasch@juno.com>; Date: Wed, 19 Jan 2005 12:59:00 -0600; Will: There was also a lot of junk designed by large project teams consisting of many people who could afford to "blow up" expensive components. There's really no need to "cut and try" anymore. I'd p; /archives//html/Amps/2005-01/msg00377.html (8,808 bytes)
4. Re: [Amps] Want to build first amp (score: 1): Author: Steven J Fraasch <sfraasch@juno.com>; Date: Wed, 19 Jan 2005 23:14:51 -0600; Tomm: If it was your first, given your gain requirement (1500w out for 50w in or 14.8 dB !), I would recommend an 8877 in grounded grid. That tube should provide 13 - 15 dB of gain depending on tube; /archives//html/Amps/2005-01/msg00388.html (9,729 bytes)
5. Re: [Amps] Want to build first amp (score: 1): Author: Steven J Fraasch <sfraasch@juno.com>; Date: Thu, 20 Jan 2005 10:41:50 -0600; Yes, thanks Rich, I recall your examination of this problem: failed grids being a parasitic oscillation issue, not generally due to DC or HF RF current. Tomm, there you go. Again, I had no problems w; /archives//html/Amps/2005-01/msg00403.html (8,301 bytes)
6. Re: [Amps] Tetrodes in GG Configuration (score: 1): Author: Steven J Fraasch <sfraasch@juno.com>; Date: Fri, 21 Jan 2005 08:32:58 -0600; Dave: Probably had nice, low IMD also. That is a distinct advantage of running a tube much larger than required, the voltage swings are relatively narrow relative to operating point thus keeping the; /archives//html/Amps/2005-01/msg00412.html (7,775 bytes)
7. Re: [Amps] PCB Trace width for 1500 watts RF? (score: 1): Author: Steven J Fraasch <sfraasch@juno.com>; Date: Sat, 29 Jan 2005 09:02:26 -0600; Dan I have my Agilent ADS RF software at work, I will run some line widths for you there next week. I am not sure if you plan on microstrip (line over ground plane) , or coplanar, where the line and; /archives//html/Amps/2005-01/msg00570.html (11,002 bytes)
8. [Amps] Follow-up notes using PCB Microstrip for RF power (score: 1): Author: Steven J Fraasch <sfraasch@juno.com>; Date: Fri, 4 Feb 2005 09:58:27 -0600; Here's a follow-up to last week's posting regarding questions using microstrip in RF design for high power apps. 1.) Microstip Line impedance calculation tool: First, a simple impedance calculator ca; /archives//html/Amps/2005-02/msg00081.html (11,619 bytes)

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