The 12BE6 is a heptode or pentagrid valve. The heptode is classically pins, is 47 mm tall. References: Datasheet &. Type 12BE6 was first introduced in 12BA6. 12BE6. Page 1. !! C. CE ELECTRONICS. 12BABE6. – DESCRIPTION AND RATING. BA6. 12BA6 Remote-Cutoff Pentode. The 12BA6 is a. electron Tube Data sheets – 1. 12BE6, General Electric, H, ( bytes). 12BE6, Brimar, H, ( bytes). 12BE6 photo, RCA (RC30).

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Collection of Ottmar Rollmann D. The device had no suppressor grid. Views Read Edit View history. It was not long before the triode and hexode structures were placed in the same glass envelope – by no means a new idea. Grid 1 acted as the oscillator grid in conjunction with grid 2 which acted as its anode. About the use in a medium wave set such as the Emerson I made a casual measurement of the performance improvement datashee the Teletone with a Datashete measurement of the AGC line:.

Collection of Niclas Pettersson S. A major advantage was that by using grid 1 as the signal input grid, the device was more sensitive to dataeheet signals. The total current draw for this radio is mA rms and mA of this current passes through the 6SB7Y heater.

The pentagrid was part of a line of development of valves that were able to take an incoming RF signal and change its frequency to a fixed intermediate frequencywhich was then amplified and detected in the remainder of the receiver circuitry.

The development of the pentagrid or heptode seven-electrode valve was a novel development in the mixer story. The manufacturer’s information also notes that the valve’s high performance comes at a cost of a high heater current of mA — double that of more conventional types.


It resulted simply from the addition of an extra screen grid to the UK version of the pentagrid heptode.

Pentagrid converter

In other datashee, all the current into the radio must pass through the 6SB7Y heater. One triode operated in a conventional datasheft circuit. To thank the Author because you find the post helpful or well done. Grid 3 accepted the incoming signal. Collection of Christian Schaufelberger CH. This was not considered a major problem in broadcast receivers where the signals were likely to be strong, but it became a problem when trying to receive weak signals that were close to strong signals.

12BE6, Tube 12BE6; Röhre 12BE6 ID, Pentagrid-Converter (

This page was last edited on 18 Marchat Some of the extra current in this radio comes from the 35L6 pentode pair used in parallel at the output. My method to deal with this difference in capacitance is a short procedure: Because grid 2 was a ‘leaky’ anode in that it allowed part of the modulated electron stream through, the oscillator was coupled into the mixing section of the valve.

The specified conversion transconductance for these three pentagrid converters is as follows: However, the UK device is different from its American counterpart. I tried reusing the glass button from a dead 7 pin tube, but the tube metal would not solder. The American devices although having no secondary emission due to the suppressor grid, nevertheless were able to get the required non linearity by biasing the oscillator such that the valve was overdriven.

It has an accurate calibrated dial and separate spread control.

America never really adopted the triode-hexode and it was seldom used, even though the 6K8 triode-hexode was available to manufacturers in Thus datwsheet grid configuration was grid 1, signal input; grids 2 and 4 screen grids connected together – again, usually internally and grid 3 was the oscillator input. Besides this they are direct replacement.

The invention of the tetrode demonstrated the idea of screening electrodes from each other by using additional earthed grounded grids at least, as far as the signal was concerned. Collection of Karlheinz Fischer D. Retrieved from ” https: I compared reception for three different stations:. Shortly after Armstrong invented the superheterodyne, a triode mixer stage design was developed that not only mixed the incoming signal with the local oscillator, but the same valve doubled as the oscillator.


One of their popular pentagrid converter designs was the MX40initially marketed in List of vacuum tubes. The Americans appeared to be driven by the desire to produce a low-cost ‘every expense spared’ design which was to lead to the All American Five. In some designs, a suppressor grid was added to produce yet another heptode design. The 9 pin socket of the 12BA7 even fits very nicely inside bakelite plug.

Mullard’s ECH81 became popular with the move to miniature nine-pin valves. It is clear that there is a significant difference in AVC response of these two tubes.

Haines of RCA applied for a patent for the pentagrid on 28 March subsequently granted on 29 March under US patent number 2, Collection of Peter Steffen CH. Although technically a four-component electrode device, neither the term tetrode nor the tetrode valve as it is known today had yet appeared.

Transconductance for the 12SG7 is umhos. In the UK, the Postmaster General who was responsible for radio licensinglaid down a set of stringent rules concerning radio interference.

Once again, the problem of coupling between the circuits would be ever present. The 12SG7 was often used as the RF preamp in some designs: Collection of Werner Sticht D.