[sdiy] Fwd: [funwithtubes] Vacuum Tube Multitasking - The Erla Superflex

[sleepy_dog at gmx.de]

Darren Shorsky via Synth-diy:
> Interesting question......  I'd love to know more.
> Hopefully the likes of Eric Barbour come by on occasion.
> I think this is the first time I've seen/heard anything about tubes on
> the list.

Well, a couple years ago I linked to this beauty (or the predecessor):
http://knifaudio.com/knifonium/

Don't look at the price tag :D

https://www.youtube.com/watch?v=ZDbQYz5hit8



>
> Thanx, d.
> ------------------------------------------------------------------------
> *From:* Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of
> cheater cheater via Synth-diy <synth-diy at synth-diy.org>
> *Sent:* May 21, 2021 5:45 PM
> *To:* synth-diy <synth-diy at synth-diy.org>
> *Subject:* [sdiy] Fwd: [funwithtubes] Vacuum Tube Multitasking - The
> Erla Superflex
> I seem to remember a filter design where the audio and the CV were in
> the same signal, and the CV was very large compared to the audio,
> essentially a bias, that set the cut-off. Was that the Moog filter
> perhaps?
>
> I wonder if this is where the inspiration for such a filter came from.
>
> Cheers
>
> ---------- Forwarded message ---------
> From: Mark <mark.erdle at gmail.com>
> Date: Fri, May 21, 2021 at 2:14 PM
> Subject: [funwithtubes] Vacuum Tube Multitasking - The Erla Superflex
> To: <main at funwithtubes.groups.io>
>
>
> In the early 1920s vacuum tubes and the circuitry to operate them were
> expensive items, so there was a great incentive to get the most bang
> for the buck out of each tube. As early as 1915, engineers realized
> that it was possible to have a single triode vacuum tube amplify audio
> and radio frequency signals at the same time. One of the more
> successful reflex radio kits was the Erla Superflex of 1924/25, but
> with the price of vacuum tubes dropping after an RCA patent expired,
> the reflex design became obsolete by mid 1925 and the TRF and
> superheterodyne took over the radio market.
>
> Robert Lozier takes a look at an Erla Superflex in this video:
> https://youtu.be/Lva1lwUUUpw
>
> Mark
> _._,_._,_
> ________________________________
> Groups.io Links:
>
> You receive all messages sent to this group.
>
> View/Reply Online (#67579) | Reply To Group | Reply To Sender | Mute
> This Topic | New Topic
> Your Subscription | Contact Group Owner | Unsubscribe
> [cheater00social at gmail.com]
>
> _._,_._,_
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at synth-diy.org
> http://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org
>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at synth-diy.org
> http://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20210521/d9488680/attachment.htm>