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<div class="moz-cite-prefix">Darren Shorsky via Synth-diy:<br>
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Interesting question...... I'd love to know more.</div>
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Hopefully the likes of Eric Barbour come by on occasion.</div>
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I think this is the first time I've seen/heard anything about
tubes on the list.</div>
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<br>
Well, a couple years ago I linked to this beauty (or the
predecessor):<br>
<a class="moz-txt-link-freetext" href="http://knifaudio.com/knifonium/">http://knifaudio.com/knifonium/</a><br>
<br>
Don't look at the price tag :D<br>
<br>
<a class="moz-txt-link-freetext" href="https://www.youtube.com/watch?v=ZDbQYz5hit8">https://www.youtube.com/watch?v=ZDbQYz5hit8</a><br>
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Thanx, d.<br>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt"
face="Calibri, sans-serif" color="#000000"><b>From:</b>
Synth-diy <a class="moz-txt-link-rfc2396E" href="mailto:synth-diy-bounces@synth-diy.org"><synth-diy-bounces@synth-diy.org></a> on behalf of
cheater cheater via Synth-diy <a class="moz-txt-link-rfc2396E" href="mailto:synth-diy@synth-diy.org"><synth-diy@synth-diy.org></a><br>
<b>Sent:</b> May 21, 2021 5:45 PM<br>
<b>To:</b> synth-diy <a class="moz-txt-link-rfc2396E" href="mailto:synth-diy@synth-diy.org"><synth-diy@synth-diy.org></a><br>
<b>Subject:</b> [sdiy] Fwd: [funwithtubes] Vacuum Tube
Multitasking - The Erla Superflex</font>
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<div class="PlainText">I seem to remember a filter design
where the audio and the CV were in<br>
the same signal, and the CV was very large compared to the
audio,<br>
essentially a bias, that set the cut-off. Was that the
Moog filter<br>
perhaps?<br>
<br>
I wonder if this is where the inspiration for such a
filter came from.<br>
<br>
Cheers<br>
<br>
---------- Forwarded message ---------<br>
From: Mark <a class="moz-txt-link-rfc2396E" href="mailto:mark.erdle@gmail.com"><mark.erdle@gmail.com></a><br>
Date: Fri, May 21, 2021 at 2:14 PM<br>
Subject: [funwithtubes] Vacuum Tube Multitasking - The
Erla Superflex<br>
To: <a class="moz-txt-link-rfc2396E" href="mailto:main@funwithtubes.groups.io"><main@funwithtubes.groups.io></a><br>
<br>
<br>
In the early 1920s vacuum tubes and the circuitry to
operate them were<br>
expensive items, so there was a great incentive to get the
most bang<br>
for the buck out of each tube. As early as 1915, engineers
realized<br>
that it was possible to have a single triode vacuum tube
amplify audio<br>
and radio frequency signals at the same time. One of the
more<br>
successful reflex radio kits was the Erla Superflex of
1924/25, but<br>
with the price of vacuum tubes dropping after an RCA
patent expired,<br>
the reflex design became obsolete by mid 1925 and the TRF
and<br>
superheterodyne took over the radio market.<br>
<br>
Robert Lozier takes a look at an Erla Superflex in this
video:<br>
<a moz-do-not-send="true"
href="https://youtu.be/Lva1lwUUUpw">https://youtu.be/Lva1lwUUUpw</a><br>
<br>
Mark<br>
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