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1. [TenTec] Centurion & Tubes (score: 1): Author: n0dbx via TenTec <tentec@contesting.com>; Date: Fri, 3 Aug 2018 10:55:29 -0500; Just bought a Centurion. Is little used, full power and working great, black and all that. I just noticed RFParts and the usual ePay sellers no longer list the 3-500zg. Anybody up on that? DXengin; /archives//html/TenTec/2018-08/msg00011.html (8,178 bytes)
2. Re: [TenTec] Centurion & Tubes (score: 1): Author: "Mcelmer1" <mcelmer1@netecin.net>; Date: Fri, 3 Aug 2018 10:17:51 -0600; Kinda off topic but if RF Parts no longer sells 3-500's we are in trouble. Ameritron manufactures a few amps using the 3-500zg. You might call/mail them and see if they sell the tubes. Mike W8TRN --; /archives//html/TenTec/2018-08/msg00012.html (9,216 bytes)
3. Re: [TenTec] Centurion & Tubes (score: 1): Author: "Mcelmer1" <mcelmer1@netecin.net>; Date: Fri, 3 Aug 2018 10:21:19 -0600; I just checked HRO and they list 3-500ZG for $229.95. I do not know how up to date the site is but the tube is "available" and not "out of stock:. Mike W8TRN -- Original Message -- From: "n0dbx via T; /archives//html/TenTec/2018-08/msg00013.html (8,965 bytes)
4. Re: [TenTec] Centurion & Tubes (score: 1): Author: Bob McGraw K4TAX <rmcgraw@blomand.net>; Date: Fri, 3 Aug 2018 11:55:44 -0500; Looks to me that RF Parts boast of the 3-500ZG on their web page. https://www.rfparts.com/tubes/tubes-3500.html <https://www.rfparts.com/tubes/tubes-3500.html> However I didn't find any pricing. I; /archives//html/TenTec/2018-08/msg00014.html (11,662 bytes)
5. Re: [TenTec] Centurion & Tubes (score: 1): Author: Greg S via TenTec <tentec@contesting.com>; Date: Fri, 3 Aug 2018 16:45:33 -0400; There will be a price increase SOON. RF Parts apparently will no longer be importing Chinese tubes. This is unconfirmed, but has been reported on social media....i.e. as reliable as the weatherguesse; /archives//html/TenTec/2018-08/msg00017.html (12,735 bytes)
6. Re: [TenTec] Centurion & Tubes (score: 1): Author: Carter <k8vt@ameritech.net>; Date: Fri, 3 Aug 2018 18:03:47 -0400; Hmmm...bad news, as I thought China was the *only* one making 3-500s. If not China, who else? Carter K8VT _______________________________________________ TenTec mailing list TenTec@contesting.com htt; /archives//html/TenTec/2018-08/msg00018.html (8,912 bytes)
7. Re: [TenTec] Centurion & Tubes (score: 1): Author: "Mcelmer1" <mcelmer1@netecin.net>; Date: Fri, 3 Aug 2018 17:25:24 -0600; More accurately, according to Karen at RF Parts, they are searching for a supplier. The only player in the 3-500ZG game is China. Furthermore, she was empathic that they WOULD stock the parts and "cu; /archives//html/TenTec/2018-08/msg00020.html (14,132 bytes)
8. Re: [TenTec] Centurion & Tubes (score: 1): Author: Bob McGraw K4TAX <rmcgraw@blomand.net>; Date: Fri, 3 Aug 2018 20:12:57 -0500; Yes, thanks to the new tariffs we can expect tube prices to go through the roof. Most tubes are made in China and branded under a US company. a.k.a. RF Parts. Bob, K4TAX Sent from my iPhone _________; /archives//html/TenTec/2018-08/msg00021.html (9,847 bytes)
9. Re: [TenTec] Centurion & Tubes (score: 1): Author: Stan Gammons <s_gammons@charter.net>; Date: Fri, 3 Aug 2018 20:30:22 -0500; I think most/all of the 3-500's are made in China now. One can still find some Eimac's that may still be good after all these years. The near 40 year old one I have may still be good. Need to put; /archives//html/TenTec/2018-08/msg00022.html (10,964 bytes)
10. Re: [TenTec] Centurion & Tubes (score: 1): Author: Bob McGraw K4TAX <rmcgraw@blomand.net>; Date: Fri, 3 Aug 2018 21:08:00 -0500; A comment on 3-500 type tubes. These types of tubes have an extremely high vacuum. NOS units are subject to air leakage into the envelope around the pin seals. The coated anode in the 3-500Z and; /archives//html/TenTec/2018-08/msg00023.html (13,949 bytes)
11. Re: [TenTec] Centurion & Tubes (score: 1): Author: Stan Gammons <s_gammons@charter.net>; Date: Fri, 3 Aug 2018 21:27:35 -0500; Hi Bob, The 3-500 is subject to going gassy. IF and that's a big if, I put the old Eimac 3-500 in the amp (best I can read the date code on it, it was made in 1979); I'll bring the amp up with a var; /archives//html/TenTec/2018-08/msg00024.html (14,642 bytes)
12. Re: [TenTec] Centurion & Tubes (score: 1): Author: <Rick@dj0ip.de>; Date: Sat, 4 Aug 2018 05:36:19 +0200; I put my 25 year old NOS into my AL-80A and let it cook for a while, then slowly applied power. I slowly ran the output power up until about 400w out. It increasingly was showing a light blue inside.; /archives//html/TenTec/2018-08/msg00025.html (15,379 bytes)
13. Re: [TenTec] Centurion & Tubes (score: 1): Author: Stan Gammons <s_gammons@charter.net>; Date: Fri, 3 Aug 2018 23:17:06 -0500; Yeah, the fireworks can be an oh crap moment! I hate to say it, but solid state amps are the future. There are some really nice LDMOS amps offered as kits or complete amps from the big companies. 73; /archives//html/TenTec/2018-08/msg00026.html (15,975 bytes)
14. Re: [TenTec] Centurion & Tubes (score: 1): Author: "Mcelmer1" <mcelmer1@netecin.net>; Date: Fri, 3 Aug 2018 22:22:09 -0600; Rick, Transistor amps were the future at least 10 years ago - good choice on your part. I and several friends have had excellent performance and service life with 3-500, 4CX1000A, 572B etc. Yes, occa; /archives//html/TenTec/2018-08/msg00027.html (16,356 bytes)
15. Re: [TenTec] Centurion & Tubes (score: 1): Author: <Rick@dj0ip.de>; Date: Sat, 4 Aug 2018 06:34:18 +0200; Well I bought my first transistorized amp about 25 years ago (ALS-600). But I had a problem with it in contests. When operating CQWW DX contest in late November, portable in the mountains of Liechten; /archives//html/TenTec/2018-08/msg00028.html (18,815 bytes)
16. Re: [TenTec] Centurion & Tubes (score: 1): Author: Byron Cordes via TenTec <tentec@contesting.com>; Date: Sat, 04 Aug 2018 08:09:54 -0500; I bet there will be a lot of amps (3-500z )Not driven so hard ! New business for someone , make some tubes ! It probably doesnt pencil out to good. Sad but tubes are on there way out. I love there gl; /archives//html/TenTec/2018-08/msg00029.html (21,861 bytes)
17. Re: [TenTec] Centurion & Tubes (score: 1): Author: Bob McGraw K4TAX <rmcgraw@blomand.net>; Date: Sat, 4 Aug 2018 08:52:17 -0500; I've often heard hams say that they are operating at reduced power on their 3-500 amps. Reason, to save the tubes. Well that may not be accurate and, in fact, may just be the opposite. The 3-; /archives//html/TenTec/2018-08/msg00030.html (22,074 bytes)
18. Re: [TenTec] Centurion & Tubes (score: 1): Author: John Farler <k4avx1@windstream.net>; Date: Sun, 12 Aug 2018 11:51:14 -0400; I use a Hercules II, with an MFJ 75 Amp switcher, and it works quite well with my Eagle. I do have an amp switching box between the two, although it probably wouldn't be necessary. I also use it with; /archives//html/TenTec/2018-08/msg00101.html (7,994 bytes)

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