- 1. [AMPS] info on tubes required (score: 1)
- Author: johnf@futurenet.co.za (John Fielding)
- Date: Thu, 26 Aug 1999 17:54:40 +0200
- A friend has been offered some replacement tubes for his HB amp. The amp runs two 3-500Z but recently one has developed a problem. He has been offered two new tubes but these are 3-750Z. I have never
- /archives//html/Amps/1999-08/msg00316.html (7,320 bytes)
- 2. [AMPS] info on tubes required (score: 1)
- Author: vk6apk@eon.net.au (Alek Petkovic)
- Date: Fri, 27 Aug 1999 06:42:30 +0800
- I may be up the wrong tree and this is right off the top of my head but could your friend have been offered a pair of Philips TB3.5-750 tubes? They look similar and fit in the sockets but I think the
- /archives//html/Amps/1999-08/msg00319.html (8,236 bytes)
- 3. [AMPS] info on tubes required (score: 1)
- Author: Uwe.Egen@t-online.de (Uwe Egen)
- Date: Fri, 27 Aug 1999 08:49:49 +0200
- Hi John, May be it is the Tube TB3-750 made by Philips. This is a Triode with 5 Volts at 14.1 A filament. The tube looks outside like 3-500z, same socket. The my is 25, plate dissipation 500 W. The t
- /archives//html/Amps/1999-08/msg00320.html (8,288 bytes)
- 4. [AMPS] info on tubes required (score: 1)
- Author: johnf@futurenet.co.za (John Fielding)
- Date: Sat, 28 Aug 1999 16:42:41 +0200
- Thanks to all who responded to my query. It seems the tubes may be TB3/750 which are similar to the 3-500Z. I have passed on the info to the ham concerned. Once again tks. John ZS5JF -- To: <amps@con
- /archives//html/Amps/1999-08/msg00334.html (8,370 bytes)
- 5. [AMPS] info on tubes required (score: 1)
- Author: measures@vcnet.com (measures)
- Date: Sat, 28 Aug 1999 09:28:52 -0700
- ? John: Did you notice that the Mu is 25 for the TB3/750? The Mu of a typical 3-500Z is 130 - 190. A tube with a Mu of 25 is not going to work in a grounded-grid amplifier. - Rich..., 805.386.3734,
- /archives//html/Amps/1999-08/msg00335.html (7,465 bytes)
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