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  Valves

  Various valves dating from the 1950s onwards, including some NOS and others pulled from 1960s/70s laboratory equipment well before they were due to be replaced.

  All valves labelled "TESTED" have be tested using a modern, PIC-based RadioElec DuoKit 3 Valve Tester - details of the tester can be found here.

• 12BH7

  The 12BH7 double triode is pin compatible with the ECC81, ECC82 and ECC83 series from Mullard but has slightly different characteristics. Brimar give the intended use as TV frame oscillator and frame output.

  The construction is compatible with audio through to low VHF use.

• ECC83

• 12AU7

• Parts or components

• M8137

• ECC82

• EF183

  The EF183 is a high gain variable μ RF amplifier pentode. It is a late 1950s design and superseded the EF85. The EF184 was the straight version of the design and replaced the EF80. All four valves have the same pin connections.

  In 1959 Mullard describe the EF183 as: a frame-grid variable-mu RF pentode for use as an automatic gain controlled IF amplifier in television receivers. The heater is suitable for series or parallel operation by AC or DC.

  The valve performance figures are given at 40 MHz and the normal TV IF frequency was around 33 MHz.

• Recently sold

• 

  CV2020

  GPO/CV 2020/Issue 1

  October 1953

  This valve is the CV 850 with tags welded to the pins and fitted with S.R.B.P disc, in accordance with P.O. drawing CD 712, intended for mounting in a B7G solder-in valve holder.

• CV2008

  GPO/CV 2008/Issue 2

  February 1953

  Type of Valve: Low Noise RF Triode Amplifier

  Cathode: Indirectly heated

  Envelope: Glass, unmetallised

  Prototype: CV 408

  This valve is a CV 408 with tags welded to the pins and fitted with PTFE disc in accordance with P.O. drawing CD 712 intended for mounting in a B7G Solder-In Valveholder

• CV2010

  This valve is a CV 858 with tags welded to the pins and fitted with SRBP disc.

• Geiger Counter Tube

  The Geiger–Müller tube or G–M tube is the sensing element of the Geiger counter instrument used for the detection of ionizing radiation. It was named after Hans Geiger, who invented the principle in 1908, and Walther Müller, who collaborated with Geiger in developing the technique further in 1928 to produce a practical tube that could detect a number of different radiation types.

• Electrometer

• 5687

  The 5687 is a special quality double triode. It is described as a general purpose medium gain triode pair with good emission. The pair can dissipate 7.5 Watts or a single triode can dissipate 4.2 Watts.

• PC88

  The PC88 is a UHF triode designed for grounded grid operation in the front end RF amplifier in Band IV and Band V television tuners. Mullard describe the PC88 as: a UHF frame-grid grounded grid amplifier triode. Miniwatt is a trade name of Philips and Mullard are the UK subsidiary of Philips.

• E182CC

• RF Test equipment

• Coming soon...

  Items that are soon to be added to the site, awaiting testing.  If you are interested in any of these items please contact me via chat of the Contact Us page.

• Amateur Radio

  Used items relating to Amateur Radio

• CV395

• CV422

• Vintage Oscilloscope Tube