Data sheets for most indirectly heated cathode tubes tell us that a warmup time of 3 minutes minimum is required for the cathode to reach operating temperature. Yet, I believe I was told that Collins
No one says you have to wait for your amp to warm up in order to work the DX station. Put your amp on standby while it's heating up and call the guy barefoot. You just might be surprised - you might
I've often wondered if it would be possible to leave the filament at say 1 1/2 - 2 volts even when the amp is off, and if doing so would cut out a large portion of the warm up time. If the tube could
Jon: I didn't make top of the honor roll (365 cfmd ) and 199 zones while sitting on my thumbs as my amp warmed up. Obviously I call barefoot while the amp warms up and sometimes make the contact that
? Sounds like a good idea, however, some experimentation would be needed to see what the new warm up time is. One can easily determine what is going on during warmup by measuring the open circuit co
On Mon, 11 Jan 1999 07:40:29 -0800 dan hearn <dhearn@ix.netcom.com> writes: Great retort Dan! I believe it was mentioned on the reflector that leaving the filaments on indirectly heated tubes continu
Is life expectancy dependent on whether the filament is directly or indirectly heated? I know that in commercial FM applications, leaving the filament running on metal-ceramic tubes for extended per
On Mon, 11 Jan 1999 08:03:42 -0800, Rich Measures <measures@vc.net> wrote: ______________________________________________ I see this strange symbol in most of your posts, Rich. It looks suspiciously
It's probably like the artist formerly known as Prince - you know, ? - the ham formerly known as Rich Frank W2FCA -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.co
In the broadcasting industry the use of low heater voltage for a standby transmitter is common practice. It is known as running the filament at "black-heat". Virtually all modern tv transmitters in t