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

cheater cheater cheater00social at gmail.com
Sat May 22 18:18:34 CEST 2021


Guys just to clarify I'm asking about a semiconductor filter. Which
filter uses bias to set frequency as well as the audio itself on the
same transistors?

On Fri, May 21, 2021 at 11:13 PM Tom Wiltshire <tom at electricdruid.net> wrote:
>
> If you’re interested in tubes stuff, I recommend DIYstompboxes.com. 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.
>
> Tom
>
> ==================
>        Electric Druid
> Synth & Stompbox DIY
> ==================
>
>
>
> On 21 May 2021, at 21:42, Darren Shorsky via Synth-diy <synth-diy at synth-diy.org> wrote:
>
> ouch!!  sorry to hear that about your -12v. supply.
> prolly best to do tubes on a separate supply.
>
> 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.
>
> d.
> ________________________________
> From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of ShedSynth via Synth-diy <synth-diy at synth-diy.org>
> Sent: May 21, 2021 7:38 PM
> To: synth-diy at synth-diy.org <synth-diy at synth-diy.org>
> Subject: Re: [sdiy] Fwd: [funwithtubes] Vacuum Tube Multitasking - The Erla Superflex
>
> I did try building this…
> https://www.lookmumnocomputer.com/projects#/valve-distorting-vca
> …but the heater ate my -12V rail.
>
>
>
> From: Synth-diy <synth-diy-bounces at synth-diy.org> On Behalf Of Darren Shorsky via Synth-diy
> Sent: 21 May 2021 20:11
> To: synth-diy <synth-diy at synth-diy.org>; cheater cheater <cheater00social at gmail.com>
> Subject: Re: [sdiy] Fwd: [funwithtubes] Vacuum Tube Multitasking - The Erla Superflex
>
>
>
> 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.
>
>
>
> 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
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