<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">If you’re interested in tubes stuff, I recommend <a href="http://DIYstompboxes.com" class="">DIYstompboxes.com</a>. There’s some people doing some amazing stuff with voltage multiplier circuits to run tube circuits off a 9V stompbox power supply. Of course, the pre-amps from the most famous amps are very popular, but there’s all sorts of stuff, and the techniques would be applicable for a lot of other things. There’s a lot of tubes in guitar-world still, remember.<div class=""><br class=""></div><div class="">Tom</div><div class=""><br class=""><div class="">
<div>==================<br class=""> Electric Druid<br class="">Synth & Stompbox DIY<br class="">==================</div><div class=""><br class=""></div><br class="Apple-interchange-newline">
</div>
<div><br class=""><blockquote type="cite" class=""><div class="">On 21 May 2021, at 21:42, Darren Shorsky via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;" class="">ouch!! sorry to hear that about your -12v. supply.</div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;" class="">prolly best to do tubes on a separate supply.</div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;" class=""><br class=""></div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;" class="">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><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;" class=""><br class=""></div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;" class="">d.<br class=""></div><div id="appendonsend" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""></div><hr tabindex="-1" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; display: inline-block; width: 647.765625px;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class=""></span><div id="divRplyFwdMsg" dir="ltr" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><font face="Calibri, sans-serif" style="font-size: 11pt;" class=""><b class="">From:</b><span class="Apple-converted-space"> </span>Synth-diy <<a href="mailto:synth-diy-bounces@synth-diy.org" class="">synth-diy-bounces@synth-diy.org</a>> on behalf of ShedSynth via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>><br class=""><b class="">Sent:</b><span class="Apple-converted-space"> </span>May 21, 2021 7:38 PM<br class=""><b class="">To:</b><span class="Apple-converted-space"> </span><a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a> <<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>><br class=""><b class="">Subject:</b><span class="Apple-converted-space"> </span>Re: [sdiy] Fwd: [funwithtubes] Vacuum Tube Multitasking - The Erla Superflex</font><div class=""> </div></div><div lang="EN-GB" link="blue" vlink="purple" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; word-wrap: break-word;" class=""><div class="x_WordSection1"><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span class="">I did try building this…</span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span class=""><a href="https://www.lookmumnocomputer.com/projects#/valve-distorting-vca" style="color: blue; text-decoration: underline;" class="">https://www.lookmumnocomputer.com/projects#/valve-distorting-vca</a></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span class="">…but the heater ate my -12V rail.</span></div><p class="x_MsoNormal" style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;"><span class=""> </span></p><div class=""><div style="border-style: solid none none; border-top-width: 1pt; border-top-color: rgb(225, 225, 225); padding: 3pt 0cm 0cm;" class=""><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><b class=""><span lang="EN-US" class="">From:</span></b><span lang="EN-US" class=""><span class="Apple-converted-space"> </span>Synth-diy <<a href="mailto:synth-diy-bounces@synth-diy.org" class="">synth-diy-bounces@synth-diy.org</a>><span class="Apple-converted-space"> </span><b class="">On Behalf Of<span class="Apple-converted-space"> </span></b>Darren Shorsky via Synth-diy<br class=""><b class="">Sent:</b><span class="Apple-converted-space"> </span>21 May 2021 20:11<br class=""><b class="">To:</b><span class="Apple-converted-space"> </span>synth-diy <<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>>; cheater cheater <<a href="mailto:cheater00social@gmail.com" class="">cheater00social@gmail.com</a>><br class=""><b class="">Subject:</b><span class="Apple-converted-space"> </span>Re: [sdiy] Fwd: [funwithtubes] Vacuum Tube Multitasking - The Erla Superflex</span></div></div></div><p class="x_MsoNormal" style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;"> </p><div class=""><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt;" class="">Interesting question...... I'd love to know more.</span></div></div><div class=""><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt;" class="">Hopefully the likes of Eric Barbour come by on occasion.</span></div></div><div class=""><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt;" class="">I think this is the first time I've seen/heard anything about tubes on the list.</span></div></div><div class=""><p class="x_MsoNormal" style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;"><span style="font-size: 12pt;" class=""> </span></p></div><div class=""><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt;" class="">Thanx, d.</span></div></div><div class="x_MsoNormal" align="center" style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; text-align: center;"><hr size="2" width="98%" align="center" class=""></div><div id="x_divRplyFwdMsg" class=""><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><b class=""><span style="" class="">From:</span></b><span style="" class=""><span class="Apple-converted-space"> </span>Synth-diy <<a href="mailto:synth-diy-bounces@synth-diy.org" style="color: blue; text-decoration: underline;" class="">synth-diy-bounces@synth-diy.org</a>> on behalf of cheater cheater via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" style="color: blue; text-decoration: underline;" class="">synth-diy@synth-diy.org</a>><br class=""><b class="">Sent:</b><span class="Apple-converted-space"> </span>May 21, 2021 5:45 PM<br class=""><b class="">To:</b><span class="Apple-converted-space"> </span>synth-diy <<a href="mailto:synth-diy@synth-diy.org" style="color: blue; text-decoration: underline;" class="">synth-diy@synth-diy.org</a>><br class=""><b class="">Subject:</b><span class="Apple-converted-space"> </span>[sdiy] Fwd: [funwithtubes] Vacuum Tube Multitasking - The Erla Superflex</span></div><div class=""><p class="x_MsoNormal" style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;"> </p></div></div><div class=""><div class=""><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class="">I seem to remember a filter design where the audio and the CV were in<br class="">the same signal, and the CV was very large compared to the audio,<br class="">essentially a bias, that set the cut-off. Was that the Moog filter<br class="">perhaps?<br class=""><br class="">I wonder if this is where the inspiration for such a filter came from.<br class=""><br class="">Cheers<br class=""><br class="">---------- Forwarded message ---------<br class="">From: Mark <<a href="mailto:mark.erdle@gmail.com" style="color: blue; text-decoration: underline;" class="">mark.erdle@gmail.com</a>><br class="">Date: Fri, May 21, 2021 at 2:14 PM<br class="">Subject: [funwithtubes] Vacuum Tube Multitasking - The Erla Superflex<br class="">To: <<a href="mailto:main@funwithtubes.groups.io" style="color: blue; text-decoration: underline;" class="">main@funwithtubes.groups.io</a>><br class=""><br class=""><br class="">In the early 1920s vacuum tubes and the circuitry to operate them were<br class="">expensive items, so there was a great incentive to get the most bang<br class="">for the buck out of each tube. As early as 1915, engineers realized<br class="">that it was possible to have a single triode vacuum tube amplify audio<br class="">and radio frequency signals at the same time. One of the more<br class="">successful reflex radio kits was the Erla Superflex of 1924/25, but<br class="">with the price of vacuum tubes dropping after an RCA patent expired,<br class="">the reflex design became obsolete by mid 1925 and the TRF and<br class="">superheterodyne took over the radio market.<br class=""><br class="">Robert Lozier takes a look at an Erla Superflex in this video:<br class=""><a href="https://youtu.be/Lva1lwUUUpw" style="color: blue; text-decoration: underline;" class="">https://youtu.be/Lva1lwUUUpw</a><br class=""><br class="">Mark<br class="">_._,_._,_<br class="">________________________________<br class=""><a href="http://Groups.io" class="">Groups.io</a> Links:<br class=""><br class="">You receive all messages sent to this group.<br class=""><br class="">View/Reply Online (#67579) | Reply To Group | Reply To Sender | Mute<br class="">This Topic | New Topic<br class="">Your Subscription | Contact Group Owner | Unsubscribe<br class="">[<a href="mailto:cheater00social@gmail.com" class="">cheater00social@gmail.com</a>]<br class=""><br class="">_._,_._,_<br class="">_______________________________________________<br class="">Synth-diy mailing list<br class=""><a href="mailto:Synth-diy@synth-diy.org" style="color: blue; text-decoration: underline;" class="">Synth-diy@synth-diy.org</a><br class=""><a href="http://synth-diy.org/mailman/listinfo/synth-diy" style="color: blue; text-decoration: underline;" class="">http://synth-diy.org/mailman/listinfo/synth-diy</a><br class="">Selling or trading? Use<span class="Apple-converted-space"> </span><a href="mailto:marketplace@synth-diy.org" style="color: blue; text-decoration: underline;" class="">marketplace@synth-diy.org</a></div></div></div></div></div><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">_______________________________________________</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Synth-diy mailing list</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class=""><a href="mailto:Synth-diy@synth-diy.org" class="">Synth-diy@synth-diy.org</a></span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class=""><a href="http://synth-diy.org/mailman/listinfo/synth-diy" class="">http://synth-diy.org/mailman/listinfo/synth-diy</a></span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Selling or trading? Use <a href="mailto:marketplace@synth-diy.org" class="">marketplace@synth-diy.org</a></span></div></blockquote></div><br class=""></div></body></html>