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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

——- LATEST NEWS ——-

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LATEST NEWS
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LATEST
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First run of newly serviced Leybold Trivac Pump.

Brimar Thermionic Products - Official Site Posted on by

This pump came to us a few years back on a Sylvania CFL bulb outgas rig. We had to condemn the rig however the pump seemed like it had some life in it. Initial test were not very promising with a pressure of 10^‐2mbar. Pete and some of the volunteers stripped the pump, gave it a good clean and reassembled it with new seals etc. and now it outperforms our current roughing pump reaching pressures of 2.9×10^-3mbar very quickly and quietly. Having tested it briefly on one of the hottest days of the year, we are awaiting some cooler days to run it in  for a few hours.


New Cams for our 4 Slide Press

Brimar Thermionic Products - Official Site Posted on by 
date: June 25, 2026 10:30am  tags: restoration, machinery

Many months ago, some of our volunteers took the one remaining cam on one of our Mullard Heritage presses and painstakingly measured it out once, twice and then once more for luck before it was put into CAD system and a drawing suitable for a foundry to cast and machined was produced.  We then had to find someone with the right skills and supply of materials to do the job. Last week, we took delivery of the cams.  Each cam is made of two parts and it has a continuous groove which drives one of the press actions. Another step forward in the restoration of our heritage Mullard 4 slide press.

Farewell to Long Wave from Droitwich

Brimar Thermionic Products - Official Site Posted on by

Open Day Programme of Events

Just down the road from our Tungsten Works factory are the long wave masts of the BBC Droitwich transmitter.  Sadly it will be shutting down at the end of this month and the faithful valve transmitters will be decommissioned.  If you are in the area on Saturday 27th June then try and pop in for the heritage open day and nose around a great piece of British broadcasting and engineering history.