2 elektronke GI-7BT ili Rusko ГИ-7БT mikrovalovni koaksialni triodi

Novo, nEKORIŠTENO.Slika podnožja samo kao kot zanimljivost, nije dio ogladsa.
50 eur je ciena za obedve. Lahko i pošljem.
Prodajem i 2 GI6B.

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OPIS:

GENERAL
Cathode: indirectly heated, dispenser, oxide-coated.
Envelope: metal-ceramic.
Cooling: 24 m3/hr forced air (GI-7bT; 27 m3/hr). For 350W dissipation, 40 m3/hr is required by all!
Height, mm, at most:
with heat sink: 110.5
without heat sink: 97
Diameter, mm, at most:
with heat sink: 65
without heat sink: 36.3+
Mass, gm, at most:
with heat sink: 330
without heat sink: 170


GI-7b/GI-70b/GI-7bT
Microwave Triode
The GI-7b, GI-70b and GI-7bT microwave triode operates as an oscillator or an amplifier in
continuous-wave or pulsed mode with anode modulation in the centimetric and decimetric
wavelength ranges. The GI-7"b" is available in two variants differing in the type of cooling:
the GI-7b with a heat sink for forced air cooling and the GI-70b with no heat sink for other
systems of cooling. The GI-7b is physically identical to the GI-6b and GS-9b, although there
are electrical differences. The GI-7bT comes with heat sink only, is more shock- and
vibration-proof, and has a larger ceramic structure. It is designed to be used in Tanks. The
"bT" varies in a few parameters from the "b", and these variations are noted in the tables
below. As with most Russian power triodes, the heat sink on the GI-7b & GI-7bT is
removable.
NOTE: Myriad tests have been conducted regarding the use of this tube for PAs at 23cm. It
is possible to derive a stable output of of up to approximately 250 W from a single tube GI7B
cavity PA, and designs for such PAs can be found on this web site. Even with outstanding
cooling, higher powers result in severe thermal drift problems. The most forgiving design is
by OK1KIR, because it uses a 1/4 w.l. anode cavity which is quite broadbanded compared
with the 3/4 w.l. cavities normally used. Even the extensive additional cooling measures
used in the OK1KIR design do not solve the thermal drift problems. Additionally, this design
will not accept the GI7BT due to physical limitations imposed by internal cavity dimensions.
In short, the GI7's internal dimensions are simply too big (too large in terms of electrical
wave length) to allow this tube to be used effectively at 23cm. The GI7 IS, however, well
suited for use in single and multiple-tube PAs from HF through 70cm, and designs for such
PAs are also on this web site (with more added as found!)