G 50c5 - UK Vintage Radio Repair and Restoration Discussion Forum

G4XWDJim · 21st Jul 2016, 3:50 pm

Is this G50C5 likely to be anything different from a plain no prefix 50C5. What might the G mean.

Any thoughts please.

Jim

Marconi_MPT4 · 21st Jul 2016, 5:23 pm

Hi,
This is one of the Brimar 'Trustworthy' range designed to operate reliably under exceptional conditions of vibration and shock in communications and industrial equipment. In every respect it will operate as a standard 50C5.

These valves offer low initial failures, low heater breakdown, low microphonics and noise and low losses from glass failure.

Cheers
Rich

G4XWDJim · 22nd Jul 2016, 7:03 am

Thanks for that Rich. I'd not heard of the 'Trustworthy' range and have a belief, maybe misplaced that high voltage heater valves are only used in cheap domestic stuff.

I do recall however that I have some CV1959 equivalents somewhere which at the time I found them surprised me thinking what military equipment would use a 50 volt heater valve.

This G50C5 does look a small purposeful device though.

Jim

TonyDuell · 22nd Jul 2016, 7:15 pm

Don't tell me some clown ran them off the 50V telephone exchange battery...

[Transistors used in old GPO telephone equipment had CV numbers, I could well believe that valves did too]

21st Jul 2016, 3:50 pm	#1
G4XWDJim Octode Join Date: Oct 2008 Location: Littlehampton, West Sussex, UK. Posts: 1,465	G 50c5 Is this G50C5 likely to be anything different from a plain no prefix 50C5. What might the G mean. Any thoughts please. Jim Attached Thumbnails

21st Jul 2016, 5:23 pm	#2
Marconi_MPT4 Heptode Join Date: Mar 2011 Location: Dorset, UK. Posts: 521	Re: G 50c5 Hi, This is one of the Brimar 'Trustworthy' range designed to operate reliably under exceptional conditions of vibration and shock in communications and industrial equipment. In every respect it will operate as a standard 50C5. These valves offer low initial failures, low heater breakdown, low microphonics and noise and low losses from glass failure. Cheers Rich __________________ To an optimist a glass is half full; a pessimist half empty; an engineer twice as big as need be!

22nd Jul 2016, 7:03 am	#3
G4XWDJim Octode Join Date: Oct 2008 Location: Littlehampton, West Sussex, UK. Posts: 1,465	Re: G 50c5 Thanks for that Rich. I'd not heard of the 'Trustworthy' range and have a belief, maybe misplaced that high voltage heater valves are only used in cheap domestic stuff. I do recall however that I have some CV1959 equivalents somewhere which at the time I found them surprised me thinking what military equipment would use a 50 volt heater valve. This G50C5 does look a small purposeful device though. Jim

22nd Jul 2016, 7:15 pm	#4
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,208	Re: G 50c5 Don't tell me some clown ran them off the 50V telephone exchange battery... [Transistors used in old GPO telephone equipment had CV numbers, I could well believe that valves did too]