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21. Re: [TenTec] Quieting fan (score: 1): Author: "Dave Edwards" <kd2e@comcast.net>; Date: Tue, 20 Jan 2004 08:04:22 -0500; Yikes!!! A poison tube??? Spewing out toxic RF?? Actually, it was the heat sink conduit...a Beryllium block that is toxic if shaved, sanded, or otherwise "messed" with. The HA14 (Compact Kilowatt) is; /archives//html/TenTec/2004-01/msg00660.html (15,204 bytes)
22. RE: [TenTec] Quieting fan (score: 1): Author: "Rick Westerman" <Rick@dj0ip.de>; Date: Tue, 20 Jan 2004 14:52:16 +0100; Thanks for clarity on the Beryllium, Dave. I couldn't remember the details - just the poison bit. The HA-14 didn't have a tuned input. I think the SB-200 did. It's been 30 years since I built one so; /archives//html/TenTec/2004-01/msg00661.html (16,467 bytes)
23. Re: [TenTec] Quieting fan (score: 1): Author: tongaloa <tongaloa@alltel.net>; Date: Tue, 20 Jan 2004 09:01:01 -0500; Gary Hoffman wrote: Many tubes are cooled with finned heatsinks, which also double as shields. I'm sure many of you have seen this done. For that matter, many tubes have metal cases. Any idea if a 57; /archives//html/TenTec/2004-01/msg00662.html (9,677 bytes)
24. Re: [TenTec] Quieting fan (score: 1): Author: tongaloa <tongaloa@alltel.net>; Date: Tue, 20 Jan 2004 09:02:20 -0500; Ron Notarius WN3VAW wrote: Wasnt the SB-230 the allegedly mobile linear, or am I thinking of a different one? Also, I seem to recall it from the era of the late 60's and/or '70's, not the '80's. 73,; /archives//html/TenTec/2004-01/msg00664.html (8,662 bytes)
25. Re: [TenTec] Quieting fan (score: 1): Author: tongaloa <tongaloa@alltel.net>; Date: Tue, 20 Jan 2004 09:06:37 -0500; Rick Westerman wrote: It was the 70's and the mobile amp was (as I recall) the HA-14 using 2x 572B's. The problem with the SB230, apart from the tube being highly poisenous, is simply the cost of a n; /archives//html/TenTec/2004-01/msg00666.html (8,939 bytes)
26. Re: [TenTec] Quieting fan (score: 1): Author: tongaloa <tongaloa@alltel.net>; Date: Tue, 20 Jan 2004 09:13:12 -0500; Dave Edwards wrote: Both amps work great. I wish the idea behind the SB230 could have been pursued. I don't think it is impossible to have silent operating There is no reason one could not take a pai; /archives//html/TenTec/2004-01/msg00667.html (8,959 bytes)
27. Re: [TenTec] Quieting fan (score: 1): Author: "Steve Baron - KB3MM" <SteveBaron@StarLinX.com>; Date: Tue, 20 Jan 2004 16:22:26 -0000; You find out what they fixed in your V's filter apparent losses ? if is SB230 hot, in _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting; /archives//html/TenTec/2004-01/msg00677.html (17,019 bytes)
28. Re: [TenTec] Quieting fan (score: 1): Author: "Stuart Rohre" <rohre@arlut.utexas.edu>; Date: Tue, 20 Jan 2004 17:46:13 -0600; For AC operated fans, you can have less heat from the voltage dropper if it is a capacitor whose reactance acts as your "resistor". -Stuart Rohre K5KVH _______________________________________________; /archives//html/TenTec/2004-01/msg00701.html (8,999 bytes)

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