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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Replaced by 12BE6A, characterized by controlled warm-up time, for series string heater operation. One company, Osrammade an ingenious move. The Mullard ECH35 was a popular choice. The conversion diagrams show a fairly straight-forward method of wiring up socket adapters. 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.
12BA7 to 12BE6 or 12SA7
I made a casual measurement of the performance improvement with the Teletone with a DC measurement of the AGC line: Mullard’s ECH81 became popular with the move to miniature nine-pin valves. Datsaheet order to distinguish between the two versions of the heptode, manufacturers data often describes them as “heptode of the hexode type” for a heptode without a suppressor grid, and datashewt “heptode of the octode type”, where a suppressor grid is present.
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. I looked datadheet the same type of log scale plot that was used in the 12SK7 data sheet, in the data sheets of the other tubes, but could not find any. Instead of the 12SK7.
electron Tube Data sheets – 1
In fact, in some designs, grid 2 consisted of just the support rods, the actual grid wire itself being omitted. The pentagrid converter in either guise operated extremely well, but it suffered from the limitation that a strong signal was able to ‘pull’ the oscillator frequency away from a weaker signal.
The pentagrid converter is a type of radio receiving valve vacuum tube with five grids used as the frequency mixer stage of a superheterodyne radio receiver. Early examples had difficulty oscillating across the frequency range because the oscillator feedback was via the first intermediate frequency transformer primary tuning capacitor, datasheeh was too small to give good feedback.
The first devices designed to change frequency in the manner described datashset seem to have been developed by the French, who simply put two grids into what would otherwise have been an ordinary triode valve the bi-grille. For the 12SK7 is umhos at the same conditions.
Thus a pentagrid radio could easily be converted to a triode-hexode without any other circuit modifications. RCA mi from Perhaps someone knows of a “hot” Hexode-Triode. I compared reception for three different stations:. Best regards, Jose Vigil ell.
I tried reusing the glass button from a dead 7 pin tube, but the tube metal would not solder. Haines of RCA applied for a patent for the pentagrid on 28 March subsequently granted on 29 March under US patent number 2, The surprise is that this radio has a dataheet series heater string, but the 6SB7Y at it’s front end requires 6. This was often accomplished by using a Hartley Oscillator circuit and taking the cathode to the tap on the coil. The cathode was connected to a secondary coil on the oscillator coil and thus coupled the oscillator into the pentode mixer section, the signal being applied to grid 1 in the conventional manner.
Collection of Danko Tkalec HR. This was done in such a way that Philips claimed that the oscillator electron beam and the mixer electron beams were separated as much as possible and thus the pulling effect was minimised. A cursory look through European Hexode-Triode frequency converters shows a range of conversion transconductanc datashet uS and uS.
Another high transconductance pentagrid covnverter that would be useful for 6. It resulted simply from the addition of an extra screen grid to the UK version of the pentagrid heptode.
One UK company, MOVsuccessfully enforced the cartel rules against the German Lissen company in when they attempted to market a radio in 12be UK which had the triode-hexode mixer. The pulling effect had a beneficial side effect in that it gave a degree of automatic tuning. Capacitor types Ceramic resonator Crystal oscillator Inductor Parametron Relay reed relay mercury switch.
Designed for low-cost AC radios, 12bw6 device was deliberately designed to allow strong signals to pull the oscillator without the risk of radiating the oscillator signal from the aerial.
This implies a sharper AGC action at the expense of tolerating smaller maximum signals at a given distortion. A major advantage was that by using grid 1 as the signal input grid, the device was more sensitive to weak signals.
Each grid was able to accept one of the incoming signals, and the non-linearity of the device produced the sum and difference frequencies. You reach this tube or valve page from a search after clicking the “tubes” tab or by clicking a tube on a radio model page. One triode operated in a conventional oscillator circuit.
InEdwin Armstrong used only triodes when he invented the superheterodyne receiver. The 9 pin socket of the 12BA7 even fits very nicely inside bakelite plug. This page was last edited on 18 Marchat This was known as the autodyne mixer. The 7pin plug for the 12BABE6 socket adapter is hard to find.
However, the Ferranti company of Great Britain entered the valve business with the first known Daatasheet pentagrid, the VHT4late in though vatasheet must have been in development, and would certainly have existed as a prototype well before that time.
The 12BA7 gives twice the conversion transconductance of the other tubes. It will be noted that the UK version would have had significant secondary emission and would also have had a tetrode kink. In other words, all the current into the radio must pass through the 6SB7Y heater.
The use of a pentode would seem an unlikely choice for a frequency converter because it only has one control grid.
12BA7 to 12BE6 or 12SA7
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.
Best regards, Jose from To thank the Author because you find the post helpful or well done. Retrieved from ” https: Collection of Patrice Zeissloff F. Collection of Peter Steffen CH. Following pressure from the UK manufacturers, the BVA datasheet compelled to relax the rules and the UK started to adopt triode-hexode mixers.