April 1933 QST
Table of Contents
Wax nostalgic about and learn from the history of early electronics. See articles
QST, published December 1915 - present. All copyrights hereby acknowledged.
At Last - Some Different Toobs!
An Exclusive Photograph of the 254G63A13S in its Native Environment
Installed in a complete transmitter. The door is open to show the
internal construction of the tube; Note the High-C circuit. The tank capacity is 200
liters. Heavy pipe conductors are used because of the intense heat generated in operation.
Manufacturers Reluctantly Start Production of New Bottles
Good news, fellows! After an interminable period of waiting, we can at last announce
a few new chubes for the use of hams only. It must, in fact, have been all of four and
a half days since the last preceding conglomeration came from the drill-presses (and
only a measly 34 new types then) so OST's daily bulletin on new tube types has been discontinued.
Out of the 68 new types announced today, we can only describe three in detail. These
have been developed by the R.A.C. laboratories at the express request of OST (express
because the request was too big to go by parcel post). Needless to say, all these new
tubes have power to burn, especially the 254G63A13S, shown in one of the photographs.
The 254G63A13S is made only for ultra-high-frequency kitchen transmitters. The oscillations
generated are very short in wave-length, but oh boy! is there hot stuff in that tank
circuit!! Did you ever back into a hot radiator with its rear end uncovered ? Well, then
you know how we felt when we did the same thing. That explains perfectly the operation
of this new tube.
We must admit a slight disappointment when we found the new tube had only two grids.
That's hardly enough for a modern tube. However the second grid isn't really a grid,
if you know what we mean. Actually it's the plate, wound in a spiral so no external tank
inductance will be necessary. The cathode is a multi-hole affair with jet emitters. We
don't know what the inner grid is for but the makers seemed to think it was necessary.
A novel feature of the 254G63A13S is the two-piece cast-iron envelope. A secret process
of manufacturing a clinging vacuum makes this new development possible. The importance
of this cannot be overestimated for it provides for continuous rejuvenation of the tube.
When the tube becomes sluggish in action, the door can be opened and the accumulated
electrons cleaned off the grid and plate with a brush. The electrons can be saved and
used over again if one wishes to be ultra-economical.
This tube is guaranteed to deliver plenty of red hot juice at short notice.
The OHNO123UGH and 123456ZZXQ!
Two small but powerful bottles
which work like brothers in push-pull but not so good in parallel.
Two New Bottles
Some interesting glassware has been added to the list in the 123456ZZXQ!& and
the OHNO123UGH shown suitably juxtaposished in the shecond photograph. The XQ!& (for
short) is at the right. It goes into oscillation with remarkable ease at any frequency,
but unfortunately has a tendency to become unstable and get out of control if used continuously.
Comes in several sizes, the largest variety being illustrated here. It packs a tremendous
wallop and can be used with wonderful effect so long as care is taken to keep the operation
below the spilling-over point. This depends mainly on the capacity of the tank. High
C is desirable. A good-sized leak also is recommended.
The 123UGH (also for short) is a small but highly efficient bottle particularly useful
as an exciter. Its specialty is the elimination of parasites. Experience with the 123-UGH
has shown, however, that in spite of its high output it is prone to give a spattery a.c.
note unless used with caution. A particularly good tube to give the young squirt in the
next block who calls you at 2 p.x. when you're trying to work some DX.
Yep, There Are Others
For instance, we have the 273DYWL29F, 36ELGH39, EIGH29AHG, $&c178, A:EUC26, 38GH20,
QCCH2837, QPW029, WM2938HT, DKEIG29, 2937, WUYN &?, 29QODJ56w, EOA395FG, QPDI563,
(Continued on page 97)
Posted June 28, 2018