The New all Valve Swift EQ

March 19, 2018

As I'm new to blogging I will keep the one swift (Bad Pun Intended) Its not often one comes across a game changer in the analog audio world. However the thermionic all valve Swift Eq unit is just that. he designer is Vic Keary whom for the old school engineers he needs no introduction, but without going into too much detail he has designed valve equipment for over 50 years. it really has to be heard to be believed!


Below is a description in Vic own words:


This two channel equaliser had been designed to be as much at home in tracking individual instruments or sitting across a stereo mix buss to equalise the final mix. As with other units of ours, such as The Phoenix, all controls are clearly labelled and setting up the eq is quick and easy, so we named it after Britain’s fastest bird in level flight.

THE SWIFT utilises influences of 2 classic designs of the “golden days” of all valve recording with improvements to bring the specs up-to-date for today’s pro use, plus added features of our own designs.

The main electronics are based around a 1950s EMI desk but with extended top and bass response. It had a BAXANDALL type active eq which we’ve kept and we added a Presence switch to give a broad band lift to mid/hi frequencies. This is based on one invented by Vic Keary in 1963 and used in his own mixing desks.

The mid lift controls are based on the Pultec design and are passive. For speedy operation and economy we have chosen just 4 frequencies, with 3 “Q” settings.

Special features of ours are Hi Pass Filter, Mid Cut and “Air” (all passive). An interesting (Pultec type) effect can be obtained by setting the High Pass Filter at its last setting which combines a shelving bass cut with a filter at very low frequency, then using plenty of bass lift at either 50 or 100 Hz.

All pots are continuously variable. We have chosen not to use indented ones for subtlety and reliability reasons.

Gain is on switches, for comparison purposes. BYPASS switch disconnects the electronics so you hear the unadulterated original signal. No metering is provided as it was deemed to be just a distraction. The Swift can output + 20 dBu without noticeable distortion and it’s practically noiseless.

Although The Swift is influenced by old designs, our electronic design is a great improvement on the old ones. There are only two valves per channel to keep colouration minimal. We use modern, specially designed, Sowter transformers and valves (tubes) not used before in this type of circuit. They simply sound better and the technical spec is outstanding.


Thanks for Reading.

Please reload

Our Recent Posts

The latest Stem mastering  from Alan Emptage @ onelouderstudios

October 23, 2019

Getting the blend right when tracking Gospels Vocals

July 25, 2018

How to Make A Crowdfunded Album

June 17, 2018

Please reload


I'm busy working on my blog posts. Watch this space!

Please reload


One Louder Studios

188A Hackney Road

E2 7QL Shoreditch



+44 (0) 7736069674

  • Facebook Social Icon
  • Twitter Social Icon
  • Instagram Social Icon
  • Google+ Social Icon