Re: do we have any electronic experts here with experience with tubes(valves)?

From	Sergio <invalid@invalid.com>
Newsgroups	sci.physics
Subject	Re: do we have any electronic experts here with experience with tubes(valves)?
Date	2016-03-14 22:18 -0500
Organization	Aioe.org NNTP Server
Message-ID	<nc7utr$1bld$2@gioia.aioe.org> (permalink)
References	<op.yecgn9hntm21m2@benson.localhost>

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>
> would running tubes at a voltage much lower than standard operating
> temperature have any permanent negative effects?

at 80% full voltage should be ok.

the biasing on the tube may stray out too far if HV is too low, then 
distortion, low gain.

Filiments, could go 70%, you can run DC instead of AC as long as total 
power is the same. (depends on which tube type, there are some old tubes 
that take a few amps for heater)


> what could potentially explain brand new tubes sounding great for a few
> hours and then audible distortion is heard after 24 hours?

bias changed, perhaps a resistor cooked a little more, or a C went more 
flaky.

I'm assuming you have an old set, with orgional R + C's

Gassy tube....

what type of radio, what type of tube ?


cant post to kooks, on banded list

Thread

do we have any electronic experts here with experience with tubes(valves)? "\"Fakey's\" dogwhistle holder living at 5907 Stanton Ave., Pittsburgh, PA (aka Teh Mop  Jockey), socked up as 5907 Stanton Avenue, Pittsburgh, PA 15206-2117" <root@127.0.0.1> - 2016-03-14 22:17 -0400
  Re: do we have any electronic experts here with experience with tubes(valves)? "%" <persent@gmail.com> - 2016-03-14 19:28 -0700
    Re: do we have any electronic experts here with experience with tubes(valves)? "\"Fakey's\" dogwhistle holder living at 5907 Stanton Ave., Pittsburgh, PA (aka Teh Mop  Jockey), socked up as 5907 Stanton Avenue, Pittsburgh, PA 15206-2117" <root@127.0.0.1> - 2016-03-14 22:28 -0400
      Re: do we have any electronic experts here with experience with tubes(valves)? "%" <persent@gmail.com> - 2016-03-14 19:35 -0700
        Re: do we have any electronic experts here with experience with tubes(valves)? "\"Fakey's\" dogwhistle holder living at 5907 Stanton Ave., Pittsburgh, PA (aka Teh Mop  Jockey), socked up as 5907 Stanton Avenue, Pittsburgh, PA 15206-2117" <root@127.0.0.1> - 2016-03-14 23:16 -0400
  Re: do we have any electronic experts here with experience with tubes(valves)? Mustaffa Sheboygan <Lunatic.Fringe@The.Edge> - 2016-03-14 19:46 -0700
    Re: do we have any electronic experts here with experience with tubes(valves)? "%" <persent@gmail.com> - 2016-03-14 19:53 -0700
    Re: do we have any electronic experts here with experience with tubes(valves)? "\"Fakey's\" dogwhistle holder living at 5907 Stanton Ave., Pittsburgh, PA (aka Teh Mop  Jockey), socked up as 5907 Stanton Avenue, Pittsburgh, PA 15206-2117" <root@127.0.0.1> - 2016-03-15 01:36 -0400
  Re: do we have any electronic experts here with experience with tubes(valves)? Sergio <invalid@invalid.com> - 2016-03-14 22:18 -0500
  Re: do we have any electronic experts here with experience with tubes(valves)? Mustaffa Sheboygan <Lunatic.Fringe@The.Edge> - 2016-03-14 22:01 -0700
    Re: do we have any electronic experts here with experience with tubes(valves)? "\"Fakey's\" dogwhistle holder living at 5907 Stanton Ave., Pittsburgh, PA (aka Teh Mop  Jockey), socked up as 5907 Stanton Avenue, Pittsburgh, PA 15206-2117" <root@127.0.0.1> - 2016-03-15 01:04 -0400
  Re: do we have any electronic experts here with experience with tubes(valves)? Bite My Shiny Metal Ass <bender@the.future> - 2016-03-15 15:03 +0800
    Re: do we have any electronic experts here with experience with tubes(valves)? "\"Fakey's\" dogwhistle holder living at 5907 Stanton Ave., Pittsburgh, PA (aka Teh Mop  Jockey), socked up as 5907 Stanton Avenue, Pittsburgh, PA 15206-2117" <root@127.0.0.1> - 2016-03-15 03:37 -0400
      Re: do we have any electronic experts here with experience with tubes(valves)? Bite My Shiny Metal Ass <bender@the.future> - 2016-03-15 16:31 +0800
        Re: do we have any electronic experts here with experience with tubes(valves)? "\"Fakey's\" dogwhistle holder living at 5907 Stanton Ave., Pittsburgh, PA (aka Teh Mop  Jockey), socked up as 5907 Stanton Avenue, Pittsburgh, PA 15206-2117" <root@127.0.0.1> - 2016-03-15 05:04 -0400
          Re: do we have any electronic experts here with experience with tubes(valves)? Bite My Shiny Metal Ass <bender@the.future> - 2016-03-16 02:25 +0800
            Re: do we have any electronic experts here with experience with tubes(valves)? "\"Fakey's\" dogwhistle holder living at 5907 Stanton Ave., Pittsburgh, PA (aka Teh Mop  Jockey), socked up as 5907 Stanton Avenue, Pittsburgh, PA 15206-2117" <root@127.0.0.1> - 2016-03-15 17:49 -0400
              Re: do we have any electronic experts here with experience with tubes(valves)? snipeco.2@gmail.com (Sn!pe) - 2016-03-16 14:15 +0000
                Re: do we have any electronic experts here with experience with tubes(valves)? Mustaffa Sheboygan <Lunatic.Fringe@The.Edge> - 2016-03-16 08:41 -0700
                Re: do we have any electronic experts here with experience with tubes(valves)? "\"Fakey's\" dogwhistle holder living at 5907 Stanton Ave., Pittsburgh, PA (aka Teh Mop  Jockey), socked up as 5907 Stanton Avenue, Pittsburgh, PA 15206-2117" <root@127.0.0.1> - 2016-03-16 11:45 -0400
        Re: do we have any electronic experts here with experience with tubes(valves)? Mustaffa Sheboygan <Lunatic.Fringe@The.Edge> - 2016-03-15 03:35 -0700
          Re: do we have any electronic experts here with experience with tubes(valves)? Bite My Shiny Metal Ass <bender@the.future> - 2016-03-16 01:52 +0800
            Re: do we have any electronic experts here with experience with tubes(valves)? Mustaffa Sheboygan <Lunatic.Fringe@The.Edge> - 2016-03-15 11:25 -0700
              Re: do we have any electronic experts here with experience with tubes(valves)? Bite My Shiny Metal Ass <bender@the.future> - 2016-03-16 02:33 +0800
      Re: do we have any electronic experts here with experience with tubes(valves)? Helmut Wabnig <hwabnig@.- --- -.dotat> - 2016-03-15 10:59 +0100
        Re: do we have any electronic experts here with experience with tubes(valves)? "\"Fakey's\" dogwhistle holder living at 5907 Stanton Ave., Pittsburgh, PA (aka Teh Mop  Jockey), socked up as 5907 Stanton Avenue, Pittsburgh, PA 15206-2117" <root@127.0.0.1> - 2016-03-15 06:17 -0400
          Re: do we have any electronic experts here with experience with tubes(valves)? snipeco.2@gmail.com (Sn!pe) - 2016-03-16 14:20 +0000
      Re: do we have any electronic experts here with experience with tubes(valves)? snipeco.2@gmail.com (Sn!pe aka g8dgc) - 2016-03-16 14:12 +0000
        Re: do we have any electronic experts here with experience with tubes(valves)? Mustaffa Sheboygan <Lunatic.Fringe@The.Edge> - 2016-03-16 08:40 -0700
    Re: do we have any electronic experts here with experience with tubes(valves)? snipeco.2@gmail.com (Sn!pe aka g8dgc) - 2016-03-16 14:08 +0000
      Re: do we have any electronic experts here with experience with tubes(valves)? Mustaffa Sheboygan <Lunatic.Fringe@The.Edge> - 2016-03-16 08:31 -0700
  Re: do we have any electronic experts here with experience with tubes(valves)? "nuny@bid.nes" <Alien8752@gmail.com> - 2016-03-15 18:33 -0700
  Re: do we have any electronic experts here with experience with tubes(valves)? snipeco.2@gmail.com (Sn!pe) - 2016-03-16 14:03 +0000
    Re: do we have any electronic experts here with experience with tubes(valves)? benj <none@gmail.com> - 2016-03-16 11:14 -0400

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