The Valve Wizard

Just an analog engineer, playing with valves.

[The Valve Wizard @ValveWizard]

There's now an app for my curve tracer!
https://t.co/tlmO4N4MEe

[The Valve Wizard @ValveWizard]

@Elektor Do you keep an archive of old projects? I've been looking for a phase meter (for measuring the phase difference between two signals). Thanks!

[The Valve Wizard @ValveWizard]

Why not use a magic eye as an audio gain stage? Find out how! https://t.co/JB7pbTtKiy

[The Valve Wizard @ValveWizard]

A useful tip if you're ever measuring phase angle from Lissajous figures

[The Valve Wizard @ValveWizard]

Sometimes I find a diagram so perfectly drawn that it changes the way I think about electronics. I'd never fully understood how oscillator bias worked on magnetic tape, yet here it is as plain as day.

[The Valve Wizard @ValveWizard]

A great little article about stability from power supply decoupling can be found here:
https://t.co/QSkZXbVxFr

[The Valve Wizard @ValveWizard]

The simulated response is... underwhelming

[The Valve Wizard @ValveWizard]

Heathkit Variable Steep-Cut Filter, 1962

[The Valve Wizard @ValveWizard]

Standby switch in a television circuit, 1962

[The Valve Wizard @ValveWizard]

Here's a good article on how to turn circuit diagrams into physical layouts. Wireless World, March 1958.
https://t.co/M0srOkGM7D

[The Valve Wizard @ValveWizard]

Class-A El84 amplifier by Peter Baxandall

[The Valve Wizard @ValveWizard]

The difference between normal and 'ruggedized' vaves

[The Valve Wizard @ValveWizard]

Did you know the venerable flip-flop, used in so many FX pedals, was once called the 'Eccles-Jordan relay'?
#logic #computing

[The Valve Wizard @ValveWizard]

@ibianco3 They are directly-heated tubes, so the filament voltage is also the bias voltage!

[The Valve Wizard @ValveWizard]

To those interested in sub-mini valves, this hearing-aid from Wireless World, March 1940

[The Valve Wizard @ValveWizard]

The common-anode phase inverter is rarely seen. Wireless World, December 1949, p494

[The Valve Wizard @ValveWizard]

@Petard38961790 Subminis are still available as NOS. For example, the 6111 and 5672 are quite popular among DIYers. I have also used the DM160 for strange experiments.

[The Valve Wizard @ValveWizard]

Explained in Radio and Television News, June 1951

[The Valve Wizard @ValveWizard]

The cathodyne used as a semi-active treble and bass EQ, 1955

[The Valve Wizard @ValveWizard]

A compact tremolo from 1957 (not actually vibrato)