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Total 9 documents matching your query.

1. [Amps] A Filament Query (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Thu, 13 Jan 2011 11:22:16 -0800 (PST); This concerns somewhat smaller tubes than are typically discussed on this reflector but, where else can I hope to find someone old, errr... experienced enough, to know the answer. Given an old miniat; /archives//html/Amps/2011-01/msg00138.html (7,131 bytes)
2. Re: [Amps] A Filament Query (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Fri, 14 Jan 2011 09:04:32 -0800 (PST); A few clarifications on the received replies: I presume that it is an oxide coated filament as it operates at barely visible deep red. I'm not sure if incandescent lamps will correlate as they are ru; /archives//html/Amps/2011-01/msg00140.html (9,940 bytes)
3. [Amps] A Filament Query (score: 1): Author: Dennis OConnor <ad4hk2004@yahoo.com>; Date: Fri, 14 Jan 2011 12:42:31 -0800 (PST); Here are a few references I have bookmarked in my electron tube folder... Black heat is normally ruinous to tubes - ymmv - I ruined a really nice 3CX1200 when the carefully adjusted filament voltage; /archives//html/Amps/2011-01/msg00141.html (7,331 bytes)
4. Re: [Amps] A Filament Query (score: 1): Author: "Roger (Sub1)" <sub1@rogerhalstead.com>; Date: Fri, 14 Jan 2011 17:33:56 -0500; In this particular instance with the short on time every minute we are looking at 1440 heating cycles per day. With that many cycles I wonder if just leaving it alone (or running near the minimum vol; /archives//html/Amps/2011-01/msg00143.html (8,678 bytes)
5. Re: [Amps] A Filament Query (score: 1): Author: "DJ7WW" <dj7ww@t-online.de>; Date: Sat, 15 Jan 2011 00:16:47 +0100; What I saw on a commercial amp with 8171 (nominal heater voltage 7.5V), they drop the heater voltage to 6.9V volts on standby and raise it to 7.5V with HT ON for transmit. 73 Peter voltage right at t; /archives//html/Amps/2011-01/msg00144.html (9,343 bytes)
6. Re: [Amps] A Filament Query (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 14 Jan 2011 21:23:25 -0500; Adjust the filament until the output power just starts to drop. Measure that voltage to see if it is within the low side spec range. If so increase it .2V and dont mess with it every hour, day, week,; /archives//html/Amps/2011-01/msg00147.html (10,908 bytes)
7. Re: [Amps] A Filament Query (score: 1): Author: Dennis OConnor <ad4hk2004@yahoo.com>; Date: Sat, 15 Jan 2011 05:22:40 -0800 (PST); Roger and Carl... I'm aware of the cycling number, which is why after mulling it over in my mind I opted to recommend the 3% drop during the idle periods as opposed to attempting to hit the magic min; /archives//html/Amps/2011-01/msg00151.html (8,037 bytes)
8. Re: [Amps] A Filament Query (score: 1): Author: TexasRF@aol.com; Date: Sat, 15 Jan 2011 08:32:02 EST; Hi Denny and others, The 60 hour loss of life for each off/on cycle is new information for me. What is the mechanism that drives that? Are there methods to mitigate the effect? This subject just begs; /archives//html/Amps/2011-01/msg00152.html (8,304 bytes)
9. Re: [Amps] A Filament Query (score: 1): Author: Gerald Boutin <gerald.boutin@oracle.com>; Date: Thu, 13 Jan 2011 17:45:10 -0400; Marv, My suggestion for long service life in this scenario is based on minimizing peak inrush currents, especially considering the large number of startup cycles you are going to have. By experiment,; /archives//html/Amps/2011-01/msg00172.html (9,039 bytes)

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