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Re: MacBook double problem

From Graham J <nobody@nowhere.co.uk>
Newsgroups uk.comp.sys.mac
Subject Re: MacBook double problem
Date 2025-09-04 16:55 +0100
Organization A noiseless patient Spider
Message-ID <109ccp0$1s2bm$1@dont-email.me> (permalink)
References (4 earlier) <1ri4lyr.scv0gtprvjpuN%liz@poppyrecords.invalid.invalid> <109beom$1kil7$1@dont-email.me> <1ri4nma.18v00lp1yqdwlcN%liz@poppyrecords.invalid.invalid> <109bj8v$1lhui$1@dont-email.me> <1ri588u.o076cch1wwq4N%liz@poppyrecords.invalid.invalid>

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Liz Tuddenham wrote:

[snip]
> 
> I am using an EL34, first wired as a diode, then as a triode.  I have
> been asked by the organisers not to go beyond a triode at this stage.
> An 807 would have been nice, as it is visually more interesting - but I
> didn't have one or the special valve base they need.

I remember building a power supply with a transformer and (probably) a 
GZ34.  I mis-wired it so the output was shorted.  The valve glowed a 
nice cherry red until I switched off.  After correcting my error the 
valve still worked fine!  You can't do that with semiconductor diodes!


-- 
Graham J

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Thread

MacBook double problem liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2025-09-03 20:24 +0100
  Re: MacBook double problem Graham J <nobody@nowhere.co.uk> - 2025-09-03 20:35 +0100
    Re: MacBook double problem liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2025-09-03 21:05 +0100
      Re: MacBook double problem "David B." <BD@hotmail.co.uk> - 2025-09-03 21:38 +0100
      Re: MacBook double problem Graham J <nobody@nowhere.co.uk> - 2025-09-03 22:52 +0100
        Re: MacBook double problem liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2025-09-04 08:12 +0100
          Re: MacBook double problem Graham J <nobody@nowhere.co.uk> - 2025-09-04 08:22 +0100
            Re: MacBook double problem liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2025-09-04 08:43 +0100
              Re: MacBook double problem David Sankey <David.Sankey@stfc.ac.uk> - 2025-09-04 09:33 +0100
              Re: MacBook double problem Graham J <nobody@nowhere.co.uk> - 2025-09-04 09:39 +0100
                Re: MacBook double problem liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2025-09-04 16:08 +0100
                Re: MacBook double problem Graham J <nobody@nowhere.co.uk> - 2025-09-04 16:55 +0100
          Re: MacBook double problem Chris <ithinkiam@gmail.com> - 2025-09-05 08:05 +0000
            Re: MacBook double problem liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2025-09-05 11:08 +0100
              Re: MacBook double problem David Sankey <David.Sankey@stfc.ac.uk> - 2025-09-05 16:48 +0100
                Re: MacBook double problem liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2025-09-05 19:18 +0100
                Re: MacBook double problem Chris <ithinkiam@gmail.com> - 2025-09-06 08:11 +0000
                Re: MacBook double problem liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2025-09-06 09:19 +0100
                Re: MacBook double problem David Sankey <David.Sankey@stfc.ac.uk> - 2025-09-06 14:16 +0100
                Re: MacBook double problem liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2025-09-08 15:06 +0100
                Re: MacBook double problem - followup liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2025-09-10 08:45 +0100
                Re: MacBook double problem - followup Graham J <nobody@nowhere.co.uk> - 2025-09-10 10:26 +0100
                Re: MacBook double problem - followup liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2025-09-10 11:20 +0100
                Re: MacBook double problem - followup David Sankey <David.Sankey@stfc.ac.uk> - 2025-09-11 16:07 +0100
                Re: MacBook double problem Chris <ithinkiam@gmail.com> - 2025-09-06 18:30 +0000
              Re: MacBook double problem Graeme Wall <rail@greywall.demon.co.uk> - 2025-09-06 08:17 +0100
                Re: MacBook double problem Alan B <alanrichardbarker@gmail.com.invalid> - 2025-09-06 07:27 +0000
                Re: MacBook double problem liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2025-09-06 09:19 +0100
                Re: MacBook double problem Phil Taylor <nothere@ail.invalid> - 2025-09-06 10:24 +0000
  Re: MacBook double problem "David B." <BD@hotmail.co.uk> - 2025-09-03 20:42 +0100
  Re: MacBook double problem liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2025-09-18 21:57 +0100
    Re: MacBook double problem "David B." <BD@hotmail.co.uk> - 2025-09-18 22:36 +0100
    Re: MacBook double problem Mark <captain.black@gmail.com> - 2025-09-18 21:54 +0000
      Re: MacBook double problem Alan B <alanrichardbarker@gmail.com.invalid> - 2025-09-19 06:45 +0000
        Re: MacBook double problem Mark <captain.black@gmail.com> - 2025-09-19 10:42 +0000
          Re: MacBook double problem Alan B <alanrichardbarker@gmail.com.invalid> - 2025-09-19 11:33 +0000
            Re: MacBook double problem Mark <captain.black@gmail.com> - 2025-09-19 20:54 +0000
              Re: MacBook double problem Alan B <alanrichardbarker@gmail.com.invalid> - 2025-09-20 07:49 +0000
                Re: MacBook double problem Mark <captain.black@gmail.com> - 2025-09-20 19:38 +0000
                Re: MacBook double problem Mark <captain.black@gmail.com> - 2025-09-20 19:50 +0000
                Re: MacBook double problem Alan B <alanrichardbarker@gmail.com.invalid> - 2025-09-20 19:53 +0000
      Re: MacBook double problem liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2025-09-19 12:22 +0100
        Re: MacBook double problem Mark <captain.black@gmail.com> - 2025-09-19 11:31 +0000

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