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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The specified conversion transconductance for these three pentagrid converters is as follows: Thanks for the information of the measured voltages. A cursory look through European Hexode-Triode frequency converters shows a range of conversion transconductanc between uS and uS.

I managed to wedge the original 12SA7 in the lower left corner of the case. Collection of Karl – Heinz Bossan D. Another triode acted as a mixer by coupling the oscillator signal into the mixer’s cathode and the received signal to the grid. Collection of Peter Steffen CH.

12BE6 datasheet & applicatoin notes – Datasheet Archive

Collection of Otto Frosinn D. At least one reference claims that the bi-grille was self-oscillating, but this has not been confirmed. This was known as the autodyne mixer. To thank the Author because dqtasheet find the post helpful or well done.

In fact, in some designs, grid 2 consisted of just the support rods, the actual grid wire itself being omitted. 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. 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.

The hexode six-electrode was actually developed after the heptode or pentagrid. In the UK, the five grids operated thus.


Pentagrid converter

Grid 1 acted as the oscillator grid as before, but in this case, grids 2 and 4 were connected together again usually internally. Best regards, Jose Vigil ell. The cathode was common to both sections of the valve. This article includes a list of referencesbut its sources remain unclear because it has insufficient inline citations. Datzsheet of Georges Werts B.

Click on these thumbnails for wiring detail: It is a charm to tune. One of their popular pentagrid converter designs was the MX40initially marketed in The invention of the tetrode demonstrated the idea of screening electrodes from each other adtasheet using additional earthed grounded vatasheet at least, as far as the signal was concerned.

It will be noted that the UK version would have had significant secondary emission and would also have had a tetrode kink. One of the things I enjoy when repairing my tube radios, is getting them to perform as well as they can. Designed for low-cost AC radios, the device was deliberately designed to allow strong signals to pull the oscillator without the risk of radiating the oscillator signal from the aerial.

Although not strictly a pentagrid in that datashdet has more than five gridsthe octode eight-electrode nevertheless operates on the pentagrid principle.

The contrast in cutoff voltages you report illustrates clearly the different AGC action for these two tubes. InEdwin Armstrong used only triodes when he invented the superheterodyne receiver. In the case of the Hallicrafters, the cutting edge of this set was to be a very good short wave receiver at very low cost.

12BA7 to 12BE6 or 12SA7

Collection of Aldo Patriarca CH. The American version was also a little more sensitive because the grid that accepted the signal was closer to the cathode increasing the amplification factor. List of vacuum tubes. This page was last edited on 18 March 112be6, at 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.

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. The idea was to produce a single valve that not only mixed the oscillator signal and the received signal and produced its own oscillator signal at the same time but, importantly, did the mixing and the oscillating in different parts of the same valve.


Following pressure from the UK manufacturers, the BVA were compelled to relax the rules and the UK started to adopt triode-hexode mixers. In these circuits, the suppressor grid 3 acted as the oscillator grid, and the valve operated in a similar manner to a true pentagrid. Other candidate pentodes with a compatible octal pinout and remote cutoff might be: Besides this they are direct replacement.

Each grid was able to accept one of the incoming signals, and the non-linearity of the device produced the sum and difference frequencies. Since the oscillator circuit was more or less self-contained, good feedback for reliable oscillation across the frequency range was easy to obtain.

The 7pin plug for the 12BABE6 socket adapter is hard to find.

TDSL Tube data [12BE6]

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.

However, the UK device is different from its American counterpart. The 12SG7 was often used as the RF preamp in some designs: One triode dataaheet in a conventional oscillator circuit. I made a casual measurement of the performance improvement with the Teletone with a DC measurement datasgeet the AGC line:. Adding the suppressor allowed Sylvania to lower the current of the 6.

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