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1. [AMPS] Line input wiring (score: 1): Author: ab4ru@stc.net (Ron Hooper); Date: Tue, 22 Dec 1998 23:39:41 +0000; Use 3 wire Plugs. You will find several different configurations but if you notice on the plug it will have a voltage/amp rating. Make sure your plug is rated for 240 and has the proper amp rating f; /archives//html/Amps/1998-12/msg00335.html (9,483 bytes)
2. [AMPS] 4CX1000A advice?? (score: 1): Author: ab4ru@stc.net (Ron Hooper, W4WA); Date: Sun, 15 Mar 1998 16:24:31 +0000; To: <amps@contesting.com> Hi Larry, I have been successful building screen grid tubes in many anps. Unless you have a low drive requirment, I would scrap the idea. The 4cx1000 has little tolerence fo; /archives//html/Amps/1998-03/msg00302.html (10,897 bytes)
3. [AMPS] isomica (score: 1): Author: ab4ru@stc.net (Ron Hooper); Date: Tue, 13 Jan 1998 22:47:03 +0000; HI Fred, I would use Kapton, polyimide film, its available from Dupont. Try their office in Wilmington, DE. Ask for the polymer products division and tell them you want a sample. The sheet they send; /archives//html/Amps/1998-01/msg00043.html (7,475 bytes)
4. [AMPS] 77DX (score: 1): Author: ab4ru@stc.net (Ron Hooper); Date: Wed, 14 Jan 1998 00:30:41 +0000; Hi Al, 1.Is the grid current reading with or without excitation to the amp and how much? 2.Put the multi meter in the plate voltage position and see it drops any at all when you key the amp. 3.Do you; /archives//html/Amps/1998-01/msg00045.html (6,993 bytes)
5. [AMPS] AL800HX vs, ETO91B vs Commander HF 2500 (score: 1): Author: ab4ru@stc.net (Ron Hooper); Date: Mon, 01 Dec 1997 16:04:20 +0000; I have one also, you will not go wrong with the HF2500. Its been thru several contest for about 5 years now. Only thing I have done is clean the relay contacts twice, on the receive side. It still ru; /archives//html/Amps/1997-12/msg00009.html (7,947 bytes)
6. [AMPS] Low line voltage (score: 1): Author: ab4ru@stc.net (Ron Hooper); Date: Sun, 07 Dec 1997 23:29:36 +0000; Hi Mike, The 208 line is going to cause low output on the amp and cause it to pull more current if driven to compensate for the line voltage. The 208 line will have a good solid 120 volts to ground s; /archives//html/Amps/1997-12/msg00117.html (7,974 bytes)
7. [AMPS] Need HV insulators/feedthru (score: 1): Author: ab4ru@stc.net (Ron Hooper); Date: Mon, 08 Dec 1997 21:01:03 +0000; Hi ALL, I am looking for a good HV connector to bring HV thru a metal plate. I have used the Millen HV connectors rated for 5 kv, which pops with 5500 on them. Any suggestions for a source and what t; /archives//html/Amps/1997-12/msg00149.html (7,928 bytes)
8. [AMPS] Need HV insulators/feedthru (score: 1): Author: ab4ru@stc.net (Ron Hooper); Date: Wed, 10 Dec 1997 00:12:23 +0000; Hello All, Thanks to all that sent me a reply on my HV connector question. I must have received 20 different replys so I wanted to send out a little follow up message on the subject. The most popular; /archives//html/Amps/1997-12/msg00193.html (9,109 bytes)
9. [AMPS] HV glitch resistor/fuse? (score: 1): Author: ab4ru@stc.net (Ron Hooper); Date: Tue, 09 Dec 1997 23:25:30 +0000; Hi Walt, I have used 10 ohm 25 watt resistors in some of my amps in the B+ leads to limit the current. I do not use them anymore after a short circuit. It blew the resistor to little pieces made a me; /archives//html/Amps/1997-12/msg00194.html (8,929 bytes)
10. [AMPS] Rebuilding an MLA2500 (score: 1): Author: ab4ru@stc.net (Ron Hooper); Date: Thu, 11 Dec 1997 00:55:56 +0000; Hi Fred, I owned one of the MLA2500's for several years but never made the mod to change the tubes out. The guy I sold it to, put it on 6 meters with a single 3cx800. I am sure a single 3cx800 would; /archives//html/Amps/1997-12/msg00203.html (8,374 bytes)
11. [AMPS] Re: 8875 = 4cx400 ? (score: 1): Author: ab4ru@stc.net (Ron Hooper); Date: Tue, 23 Dec 1997 22:15:00 +0000; The 8875 is also designed to be cooled differently from the 4cx400's as well. It can not directly replace the 8875. It will fit the same tube socket so if you want to modify the cooling and the wirin; /archives//html/Amps/1997-12/msg00357.html (7,875 bytes)
12. [AMPS] An open response to Tom, W8JI (score: 1): Author: ab4ru@stc.net (Ron Hooper); Date: Thu, 06 Nov 1997 23:09:00 +0000; I would suggest that anyone that dislikes what he or she see's on this reflector to un-subscribe. The administrator can handle any abuse by simply locking out the offender's. Lets please leave that u; /archives//html/Amps/1997-11/msg00076.html (7,737 bytes)
13. [AMPS] 6M Linear designs (score: 1): Author: ab4ru@stc.net (Ron Hooper); Date: Wed, 12 Nov 1997 23:02:01 +0000; Hello, I have never tried a circuit like described with the capacitor acting as a blocking and plate tune. It sounds a little screwy to me too. I think I would do this, put in a fixed value blocking; /archives//html/Amps/1997-11/msg00188.html (9,602 bytes)
14. [AMPS] USE OF AUTO TRANSFORMER (score: 1): Author: ab4ru@stc.net (Ron Hooper); Date: Mon, 17 Nov 1997 13:46:20 +0000; Yes you increase the primary voltage and it will give you higher secondary voltage. The catch is do you think the transformer your using will handle the extra KVA you will be asking it to handle? If; /archives//html/Amps/1997-11/msg00224.html (8,607 bytes)
15. [AMPS] Grid Swamping resistor for 4CX250B (score: 1): Author: ab4ru@stc.net (Ron Hooper); Date: Wed, 01 Oct 1997 12:55:15 +0100; Hi Walter, I have built several of those type amps using the 4cx250 tubes. The handbook is correct, you will not need a swamping resistor. However I recommend using good mechanical construction in is; /archives//html/Amps/1997-10/msg00004.html (8,193 bytes)
16. [AMPS] 2X4-1000A G-G AMP (score: 1): Author: ab4ru@stc.net (Ron Hooper); Date: Wed, 01 Oct 1997 13:22:56 +0100; Hi Mike, Sounds like you have a real problem. From your message I conclude your using GG which should make the amp insensitive, normally. Without looking at the construction I guess that your getting; /archives//html/Amps/1997-10/msg00005.html (9,104 bytes)
17. [AMPS] Re: [CQ-Contest] Ameritron AL1500x efficiency ? (score: 1): Author: ab4ru@stc.net (Ron Hooper); Date: Wed, 01 Oct 1997 13:43:51 +0100; Hi Chris, Have you tried tuning the amp into a dummy load on 20 meters? If not try that first to make sure the problem is in the amp. It is possible that something is wrong perhaps from the factory c; /archives//html/Amps/1997-10/msg00006.html (8,963 bytes)
18. [AMPS] How long to 'cook' tubes (score: 1): Author: ab4ru@stc.net (Ron Hooper); Date: Wed, 01 Oct 1997 14:16:40 +0100; Hi Paul, I would be more worried about the power supply blowing up from age than the tubes. The 3-500 is a instant on tube and a time delay is not important. Assuming the amp does not have a time del; /archives//html/Amps/1997-10/msg00007.html (8,139 bytes)
19. [AMPS] Alpha 77's (score: 1): Author: ab4ru@stc.net (Ron Hooper); Date: Sat, 02 Aug 1997 11:42:32 +0100; Hello, Can someone tell me the difference between the 77d, 77dx and the 77sx I know there were others like the PA. Also if the kit for installing the second 8877 is still available? I think the sx wa; /archives//html/Amps/1997-08/msg00006.html (6,851 bytes)
20. [AMPS] Alpha 77 amps (score: 1): Author: ab4ru@stc.net (Ron Hooper); Date: Sat, 02 Aug 1997 18:27:01 +0100; Hello All, Thanks for the input on the Alpha's. I am going to purchase a 77d, which is a large case, like the DX. From what I have gathered from the reflector, the DX is a newer model and has provisi; /archives//html/Amps/1997-08/msg00012.html (7,933 bytes)

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