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 Otto Frosinn D. The difference in performance between the two tubes was not as obvious as it was with 12BA7 vs 12SA7 pentagrid mixers mentioned 12bf6, despite a two-to-one ratio in transconductances in the pentodes. Collection of Danko Tkalec HR. Grid 1 acted datsaheet the oscillator grid as before, but in this case, grids 2 and 4 were connected together again usually internally. Collection of Georges Werts B. 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.

However, the UK device is different from its American counterpart. Because grid 2 was a ‘leaky’ anode in that it allowed part of the modulated electron stream through, the oscillator was 12be66 into the mixing section of the valve.

One UK company, MOVsuccessfully enforced the cartel rules against the German 112be6 company in when they attempted to market a radio in the UK which had the triode-hexode mixer. The contrast in cutoff voltages you report illustrates clearly the different AGC action for these two tubes.

12BA7 to 12BE6 or 12SA7

Grid 2 functioned as both a screen datasheey the oscillator anode; in this case the grid wire had to catasheet present to provide the screening. Collection of Karl – Heinz Bossan D. Grid 4 accepted the incoming signal with the remaining two grids, 3 and 5 connected together usually internally which acted as screen grids to screen the anode, grid 4 and grid 2 from each other.


This was often accomplished by using a Hartley Oscillator circuit and taking the cathode to the tap on the coil. Some short wave radios managed quite satisfactorily with these devices. One of the things I enjoy when repairing my tube radios, is getting them to perform as well as they can. It is clear that there is a significant difference in AVC response of these two tubes.

Another disadvantage was that in spite of the presence of the screen grids, the electron beam, modulated by the oscillator electrodes, still had to pass through the signal grid, and coupling of the oscillator into the signal circuit was inevitable.

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.

A major advantage was that by using grid 1 as the signal input grid, the device was more sensitive to weak signals.

For the 12SK7 is umhos at the same conditions. List of vacuum tubes List of tube sockets. In other words, all the current into the radio must pass through the 6SB7Y heater. 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. I tried it in a Emerson with very good success.

Haines of RCA applied for a patent for the pentagrid on 28 March subsequently granted on 29 March under US patent number 2, This article includes a list of referencesbut its sources remain unclear because it has insufficient inline citations.

Collection of Dirk Sponholz D. It was not long before the triode and hexode structures were placed in the same glass envelope – by no means a new idea. Collection of Patrice Zeissloff F.

12BA7 to 12BE6 or 12SA7

This scheme works so well that a 68R resistor was wired in parallel with the 6SB7Y heater to shunt away some 90mA of excess current. It would have been interesting to superimpose the transconductance curves for the various pentodes. The development of the pentagrid or heptode seven-electrode valve was a novel development in the mixer story. This allowed Philco to use this valve in every line of radio throughout the s.

  ASTM C1557 PDF

The hexode six-electrode was actually developed after the heptode or pentagrid. Grid 1 acted as the oscillator grid in conjunction with grid 2 which acted as its anode.

Pentagrid converter

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. However, the Ferranti company of Great Britain entered the valve business with the first known UK-produced pentagrid, the VHT4late in though it must have been in development, and would certainly have existed as a prototype well before that time.

Collection of Tomasz Szczesniak PL. Some of this may be simply a result of improved detector efficiency, when running with a stronger signal. July Learn how and when to remove this template message. Introduced by Sylvania in and used mostly by Philcothis valve was the product of adding a suppressor grid to type 7B8which was the loctal version of type 6A7.

This is nearly a factor of 4 improvement in output signal. Click on these thumbnails for wiring detail: The clever bit was that the X41 was a direct plug-in pin-compatible replacement for the MX The All American Five was to use a pentagrid converter from when it first appeared inright up until valves became obsolete when transistors took over.