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ouch!! sorry to hear that about your -12v. supply.</div>
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prolly best to do tubes on a separate supply.</div>
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i'm aware that Metasonix has posted quite a bit of info. around the web about soe of his older projects & there's a supply or two in there.</div>
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d.<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of ShedSynth via Synth-diy <synth-diy@synth-diy.org><br>
<b>Sent:</b> May 21, 2021 7:38 PM<br>
<b>To:</b> synth-diy@synth-diy.org <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] Fwd: [funwithtubes] Vacuum Tube Multitasking - The Erla Superflex</font>
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<p class="x_MsoNormal"><span style="">I did try building this…</span></p>
<p class="x_MsoNormal"><span style=""><a href="https://www.lookmumnocomputer.com/projects#/valve-distorting-vca">https://www.lookmumnocomputer.com/projects#/valve-distorting-vca</a></span></p>
<p class="x_MsoNormal"><span style="">…but the heater ate my -12V rail.</span></p>
<p class="x_MsoNormal"><span style=""> </span></p>
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<p class="x_MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Synth-diy <synth-diy-bounces@synth-diy.org>
<b>On Behalf Of </b>Darren Shorsky via Synth-diy<br>
<b>Sent:</b> 21 May 2021 20:11<br>
<b>To:</b> synth-diy <synth-diy@synth-diy.org>; cheater cheater <cheater00social@gmail.com><br>
<b>Subject:</b> Re: [sdiy] Fwd: [funwithtubes] Vacuum Tube Multitasking - The Erla Superflex</span></p>
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<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black">Interesting question...... I'd love to know more.</span></p>
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<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black">Hopefully the likes of Eric Barbour come by on occasion.</span></p>
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<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black">I think this is the first time I've seen/heard anything about tubes on the list.</span></p>
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<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black">Thanx, d.</span></p>
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<p class="x_MsoNormal"><b><span style="color:black">From:</span></b><span style="color:black"> Synth-diy <<a href="mailto:synth-diy-bounces@synth-diy.org">synth-diy-bounces@synth-diy.org</a>> on behalf of cheater cheater via Synth-diy <<a 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 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</span>
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<p class="x_MsoNormal">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 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 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 href="https://youtu.be/Lva1lwUUUpw">https://youtu.be/Lva1lwUUUpw</a><br>
<br>
Mark<br>
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