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Total 22 documents matching your query.

1. [Amps] Cheap auxiliary amp cooling (score: 1): Author: Jim Barber <audioguy@q.com>; Date: Fri, 30 Mar 2012 00:29:21 -0700; While playing with my new toy, (QRO HF2500DX) I found that I was able to confirm that it does indeed need auxiliary cooling for high duty cycle modes. Even at relatively low or no power output - just; /archives//html/Amps/2012-03/msg00353.html (7,788 bytes)
2. Re: [Amps] Cheap auxiliary amp cooling (score: 1): Author: "GeorgeWallner" <aa7jv@atlanticbb.net>; Date: Fri, 30 Mar 2012 09:12:54 -0400; On Fri, 30 Mar 2012 00:29:21 -0700 <a 250mm (10"!) 12V PC case fan has a Jim, That sounds like a good fan and it will likely prolong the life of you amp. Do not automatically assume, however, that "b; /archives//html/Amps/2012-03/msg00354.html (7,970 bytes)
3. Re: [Amps] Cheap auxiliary amp cooling (score: 1): Author: Bob K6UJ <k6uj@pacbell.net>; Date: Fri, 30 Mar 2012 06:40:44 -0700; Jim, Sounds good. I added a computer fan to my Alpha 76CA also. The air inlet vent holes are on the back of the amp so I bolted the fan over the inlet. It looks like the original design. I used a Rad; /archives//html/Amps/2012-03/msg00355.html (9,644 bytes)
4. Re: [Amps] Cheap auxiliary amp cooling (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Fri, 30 Mar 2012 08:50:34 -0500; Before everyone goes crazy with adding fans, a few things to keep in mind: An added fan if not done right can actually disrupt air flow and make things worse; not better. An added fan can push or pul; /archives//html/Amps/2012-03/msg00356.html (7,193 bytes)
5. Re: [Amps] Cheap auxiliary amp cooling (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Fri, 30 Mar 2012 08:08:21 -0700; I often wonder why so many amplifiers are designed so that the full ZSAC flows when the user isn't actually transmitting. I always install a circuit in my QSK amplifiers which cuts off the plate curr; /archives//html/Amps/2012-03/msg00357.html (10,249 bytes)
6. Re: [Amps] Cheap auxiliary amp cooling (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 30 Mar 2012 11:41:22 -0400; Isnt that exciting having to run almost 1100W idle with 2 tubes only rated at 1200W dissipation total? No wonder they dont last long and availability is drying up. Carl KM1H _________________________; /archives//html/Amps/2012-03/msg00358.html (10,053 bytes)
7. Re: [Amps] Cheap auxiliary amp cooling (score: 1): Author: Bob K6UJ <k6uj@pacbell.net>; Date: Fri, 30 Mar 2012 08:48:48 -0700; HIHIHIHI !!!!!!!! better get some spares soon before they can't be found anymore :-) Bob K6UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contes; /archives//html/Amps/2012-03/msg00359.html (10,390 bytes)
8. Re: [Amps] Cheap auxiliary amp cooling (score: 1): Author: Frank T Brady <franktbrady@comcast.net>; Date: Fri, 30 Mar 2012 12:00:08 -0400; Do you (or anyone else) know whether or not there is a (significantly) higher cfm replacement for your original fan Jim? 73 frank w0ecs _______________________________________________ Amps mailing li; /archives//html/Amps/2012-03/msg00360.html (11,056 bytes)
9. Re: [Amps] Cheap auxiliary amp cooling (score: 1): Author: "Leigh Turner" <invertech@frontierisp.net.au>; Date: Fri, 30 Mar 2012 23:04:35 +1030; Hi Jim, A quiescent power dissipation of circa 1.1 kW in an amplifier is insane; an energy wasteful desk-top blast furnace! Such a design also places undue stress on the tube(s) and reduced service l; /archives//html/Amps/2012-03/msg00361.html (10,591 bytes)
10. Re: [Amps] Cheap auxiliary amp cooling (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Fri, 30 Mar 2012 12:57:07 -0400; In the ACOM 2000A, three-state bias is used. -124V on standby, -75V during plate idling when the PTT line is pulled low, and -52V when input RF is sensed. When using VOX, the amp is quickly transiti; /archives//html/Amps/2012-03/msg00362.html (9,394 bytes)
11. Re: [Amps] Cheap auxiliary amp cooling (score: 1): Author: Jim Barber <audioguy@q.com>; Date: Fri, 30 Mar 2012 10:13:12 -0700; Thanks, George. In this particular case, I haven't noticed any RF *yet*, but my antennas are some distance from the shack, with common-mode chokes on all the cabling. I'm still slowly digging out aft; /archives//html/Amps/2012-03/msg00363.html (9,514 bytes)
12. Re: [Amps] Cheap auxiliary amp cooling (score: 1): Author: Jim Barber <audioguy@q.com>; Date: Fri, 30 Mar 2012 10:17:17 -0700; Rob, In this particular case, the manufacturer recommends adding a fan for high duty cycle modes. Your point is well taken, though. More pressure would help. Assuming the flange is a standard size, a; /archives//html/Amps/2012-03/msg00364.html (9,525 bytes)
13. Re: [Amps] Cheap auxiliary amp cooling (score: 1): Author: Jim Barber <audioguy@q.com>; Date: Fri, 30 Mar 2012 10:21:59 -0700; Yep, but really no different than my Henry 3KA running 200ma ZSAC @ 4KV with a pair of 3-500Z's. That one isn't good either. The tubes will glow orange after a minute or so just keyed with no drive.; /archives//html/Amps/2012-03/msg00365.html (11,391 bytes)
14. Re: [Amps] Cheap auxiliary amp cooling (score: 1): Author: hs0zed@csloxinfo.com; Date: Sat, 31 Mar 2012 00:26:33 +0700; I have a bit of a problem understanding this too. Maybe I'm missing something but of all the amps I own they all draw only filament power when not transmitting. As soon as I start transmitting I'm sp; /archives//html/Amps/2012-03/msg00366.html (12,231 bytes)
15. Re: [Amps] Cheap auxiliary amp cooling (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 30 Mar 2012 15:54:19 -0400; That sounds like a shorted zener and running at zero bias or just poor engineering but you cant blame the tubes. Mine run at 120ma at 3000V in the LK-500ZC and IMD 3 is in the low -40's. Carl KM1H __; /archives//html/Amps/2012-03/msg00367.html (12,526 bytes)
16. Re: [Amps] Cheap auxiliary amp cooling (score: 1): Author: Jim Barber <audioguy@q.com>; Date: Fri, 30 Mar 2012 13:04:37 -0700; To quote Microsoft, "This [poor] behavior is by design." ;-) WRT the 3KA, if I ever found time I'd like to: . Put in a single 8877 socket . Lift B- off of ground enough to meter . Ground the grid dir; /archives//html/Amps/2012-03/msg00368.html (13,789 bytes)
17. Re: [Amps] Cheap auxiliary amp cooling (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Fri, 30 Mar 2012 21:44:55 -0400; My commercial amp uses EBS on CW break-in just fine and when using VOX on SSB. I really don't like the idea of using the PTT line though as I tend to hang onto the mike while EBS would save a lot of; /archives//html/Amps/2012-04/msg00000.html (8,012 bytes)
18. Re: [Amps] Cheap auxiliary amp cooling (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Fri, 30 Mar 2012 21:46:09 -0400; They trying to use those poor little tubes on Class A? 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listin; /archives//html/Amps/2012-04/msg00001.html (7,263 bytes)
19. Re: [Amps] Cheap auxiliary amp cooling (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 1 Apr 2012 11:56:07 -0400; Very light AB1 to get somewhat acceptable IMD which is typical of all Russian tubes including triodes. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com; /archives//html/Amps/2012-04/msg00002.html (7,979 bytes)
20. Re: [Amps] Cheap auxiliary amp cooling (score: 1): Author: Jim Barber <audioguy@q.com>; Date: Sun, 01 Apr 2012 09:59:03 -0700; Roger, The fan IS blowing up and the case temp is actually substantially lower. Pushing the exhaust air back down into the case wouldn't make much sense?? 73, Jim N7CXI ______________________________; /archives//html/Amps/2012-04/msg00003.html (9,534 bytes)

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