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1. [Amps] Fans for 4cx1000/1500 question (score: 1): Author: paule@sfu.ca (Paul Erickson); Date: Mon, 04 Mar 2002 12:28:04 -0800; I need to know how to determine if the following fans will be adequate for an 4cx1000/1500 amp. While I can find the cfm specs, I cannot find the back pressure specs. Can anyone help me out? The fans; /archives//html/Amps/2002-03/msg00050.html (7,922 bytes)
2. [Amps] Fans for 4cx1000/1500 question (score: 1): Author: oz1pif@get2net.dk (Peter Frenning, OZ1PIF); Date: Mon, 4 Mar 2002 22:11:20 +0100; Hi Paul, Only as long as you don't power up the tube - not even the filament! :-) Seriously you'll need a fan of the "squirrel cage" type and a pressure tight grid compartment through which the fan b; /archives//html/Amps/2002-03/msg00051.html (9,578 bytes)
3. [Amps] Fans for 4cx1000/1500 question (score: 1): Author: mike.tubby@thorcom.co.uk (Michael J. Tubby B.Sc (Hons) G8TIC); Date: Mon, 4 Mar 2002 22:12:52 -0000; Paul, I've built several 8877 and 4CX1000A/1500B amplifiers and recommend a "blower" like the on Peter's suggesting also, I've had good results with the Airflow Developments 45CTL, have a look at: ht; /archives//html/Amps/2002-03/msg00052.html (11,212 bytes)
4. [Amps] Fans for 4cx1000/1500 question (score: 1): Author: jstrohm@texas.net (Jim Strohm); Date: Mon, 4 Mar 2002 15:57:04 -0600; Paul Erickson <paule@sfu.ca> asks Eimac provides figures for required backpressure on its external anode tubes. A simple method for measuring backpressure is provided in the ARRL handbooks and in Eim; /archives//html/Amps/2002-03/msg00053.html (9,302 bytes)
5. [Amps] Fans for 4cx1000/1500 question (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 4 Mar 2002 16:07:38 -0800; Ordinary fans do not create enough air pressure to cool external anode tubes. A centrifugal blower makes more pressure. I like to mount the tube/socket in a cardboard box and measure air pressure wi; /archives//html/Amps/2002-03/msg00057.html (8,506 bytes)
6. [Amps] Fans for 4cx1000/1500 question (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 4 Mar 2002 16:20:55 -0800; ? To measure pressure differential with a manometer, connect one hose below the chassis and the other hose into the anode sucker duct/blower inlet. It matters not whether it's a suck or blow cooling; /archives//html/Amps/2002-03/msg00059.html (8,797 bytes)
7. [Amps] Fans for 4cx1000/1500 question (score: 1): Author: k4oj@tampabay.rr.com (Jim White, K4OJ); Date: Mon, 4 Mar 2002 20:19:35 -0800; interesting fans - going back to a post of mine a week or two ago... has anyone tried using and air conditioner as a source for cooling finals...I notice the referenced page show two inlet models...s; /archives//html/Amps/2002-03/msg00060.html (13,224 bytes)
8. [Amps] Fans for 4cx1000/1500 question (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 5 Mar 2002 14:22:03 +0000; Agreed about the cardboard box mock-up, just to see if the blower is big enough. Broadening the answer, it is better to measure the cfm directly by letting the exhaust air blow up a thin plastic bag,; /archives//html/Amps/2002-03/msg00097.html (10,614 bytes)
9. [Amps] Fans for 4cx1000/1500 question (score: 1): Author: gschafer@mediaone.net (Gary Schafer); Date: Tue, 05 Mar 2002 13:33:21 -0500; Interesting thoughts Ian. Would you think that pressurizing the output compartment on an hf amplifier with a tube like a 4CX250 or a 4CX1000 would be practical? It sure would help on the 4CX250 if so; /archives//html/Amps/2002-03/msg00098.html (11,677 bytes)
10. [Amps] Fans for 4cx1000/1500 question (score: 1): Author: mike.tubby@thorcom.co.uk (Michael J. Tubby B.Sc (Hons) G8TIC); Date: Tue, 5 Mar 2002 19:44:31 -0000; would had. There are some more points that may be of interest: 1. Airflow are also in the USA and can be found at www.airflow.com 2. On my 6m 8877 amp I use only a 40BTFL blower which is rated at 48.; /archives//html/Amps/2002-03/msg00100.html (14,211 bytes)
11. [Amps] Fans for 4cx1000/1500 question (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 5 Mar 2002 12:45:48 -0800; ? Eimac provides a number of pressure vs cfm points in their spec sheets. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-03/msg00102.html (8,863 bytes)
12. [Amps] Fans for 4cx1000/1500 question (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 5 Mar 2002 22:49:38 +0000; These pressure figures only relate to the one particular method of blowing: upward through the socket, chimney and anode cooler in series. For other methods of blowing, the pressure drops will be dif; /archives//html/Amps/2002-03/msg00104.html (9,559 bytes)
13. [Amps] Fans for 4cx1000/1500 question (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 5 Mar 2002 22:43:20 +0000; Just as practical as it is on VHF and above, where it is the standard method. The only reason it isn't used so much on HF is because many people feel it's OK to let RF wander all around the insides o; /archives//html/Amps/2002-03/msg00105.html (9,492 bytes)
14. [Amps] Fans for 4cx1000/1500 question (score: 1): Author: wd7s@att.net (PAUL HEWITT); Date: Tue, 5 Mar 2002 15:57:35 -0800; - think that pressurizing the output tube like a 4CX250 or a 4CX1000 would Just as practical as it is on VHF and above, where it is the standard method. The only reason it isn't used so much on HF is; /archives//html/Amps/2002-03/msg00106.html (10,121 bytes)
15. [Amps] Fans for 4cx1000/1500 question (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 5 Mar 2002 17:33:50 -0800; ? for some tubes, air is specified as blown from cathode to anode. . - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-03/msg00109.html (9,916 bytes)

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