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Brimar thermionic products are dedicated to bringing you the best valves possible. We know this is a huge task and not one to be taken lightly but each time you purchase one of our electron tubes it brings Brimar closer to manufacturing right here in the U.K.

We sincerely hope that you join our quest to manufacture high quality British Audio and we thank you for your highly valued custom.

From all at Brimar Thermionic Products

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Top Notch Engineering

Brimar Thermionic Products - Official Site Posted on by

The R-Type valve that we currently produces uses a fairly simple grid which is just wound around a former to look like a spring. All our next valves will need grids/screens that are very different in size and shape. The grid wires are very fine and need to be supported on backbones to keep their shape.

Grids like these are wound in a different way in order to attach the grid wires to the backbones. Our latest project is to design a system to create notches in the backbone at very regular intervals. The grid wire will be laid into the notches and the notch edges will be smoothed over to trap the wire.

You can see in the image left that our cutting pattern is getting very regular now and so it is on to the next stage of laying the wire and and peening  the edges.

Bulb Forming Machine comes to life after 40 years

Brimar Thermionic Products - Official Site Posted on by
Dave Ian and Pete in their element carefully and slowly nurturing the bulb forming machine back to life. This is a small bulb for ECC83 style dual triodes.
Though not yet the correct shape, considering this machine hasn't run for over 40 years, things are looking very good.
A big thank you goes to our Great British Valve Project volunteers Dave & Ian along with Pete our glass worker and all those that cleaned this machine from its original condition of glass, rust and oil. We have had to provide new electrics, update the gas system, reset the burners and make it work with unleaded glass!  We hope to have this brilliant piece of kit up an running fully soon.

Mark breathes life into the Activation Rack.

Brimar Thermionic Products - Official Site Posted on by
After many months of checking wiring and building a Python code library, Mark is now at the point of running test cases on the whole activation system to check all the main functions perform correctly before we connect the 3 phase power and test some valves.
Mark's code is based on the methodology developed by another volunteer Ted when we reengineered Brimar Display's award winning design.   After talking to some ex-engineers from Middleton and acquiring some otherwise scrap pieces from the original system, we brought that back to life a few years ago.
Our industrial sized rack was designed in 2018 by Roy, and based on the documents and experiences recounted to us by people in the know. 
Over lockdown a number of volunteers built the 8 front panels from a detailled kit of parts which we supplied. Post lockdown we decided to computerise the system to make it safer, less prone to operator error and dangerous failure modes.  Pete designed the 3 phase power system based on Bob's control system architecture design. Virtually all the volunteers have had some hand in getting the project this far. 
We plan to have everything completed by the end of the year and that will be another major tool and step forward towards producing more complicated audio valves.
In the meantime, if you want to learn more about using valves or want to purchase a slice of our UK manufacturing history, why not purchase one of our Ediswan Type R Triodes?