On 16 Aug 2003 14:03:37 GMT, RLucch2098 hath writ:

Can anyone tell me what this tube is or used for?
http://www.myradioroom.com/oddwetube1.jpg
http://www.myradioroom.com/oddwetube2.jpg

Looks like a (low power) klystron to me.

The puppy is nice. A ruler would've been better.

73
Jonesy
--
| Marvin L Jones | jonz | W3DHJ | OS/2
| Gunnison, Colorado | @ | Jonesy | linux __
| 7,703' -- 2,345m | config.com | DM68mn SK

Jonesy is correct. Actually, I'm not familiar with this exact model
klystron, but have worked with a lot of very similar ones used as the local
oscillator for marine radar receivers. The base pin arrangement, which is an
obvious "octal" base scheme variation includes one extra long pin. You can
see it in the photographs. That pin is the klystron oscillator's output. It
is actually a radiating "probe", sort of an antenna that protrudes right
into a microwave "cavity". The 2K25 or RK25 was a common WWII surplus item
that Ham experimenters used as an "X" band RF source. It's output frequency
was a little higher than 9ghz if memory serves me right, and could directly
feed a microwave "horn" antenna for transmission. It is tuned in two ways.
Coarse tuning was done by turning a square headed screw on the
"grasshopper", the outboard metal junk hanging on the side of the metal
envelope. Fine tuning was by adjusting the voltage on the top cap. Cathode??
Oh, yeah, the tool used to coarse tune this little hummer must be insulated.
Lethal (or nearly lethal, in my case) voltage is right on that blasted
square headed screw.
Lynn, W7LTQ

Jonesy is correct. Actually, I'm not familiar with this exact model
klystron, but have worked with a lot of very similar ones used as the local
oscillator for marine radar receivers. The base pin arrangement, which is an
obvious "octal" base scheme variation includes one extra long pin. You can
see it in the photographs. That pin is the klystron oscillator's output. It
is actually a radiating "probe", sort of an antenna that protrudes right
into a microwave "cavity". The 2K25 or RK25 was a common WWII surplus item
that Ham experimenters used as an "X" band RF source. It's output frequency
was a little higher than 9ghz if memory serves me right, and could directly
feed a microwave "horn" antenna for transmission. It is tuned in two ways.
Coarse tuning was done by turning a square headed screw on the
"grasshopper", the outboard metal junk hanging on the side of the metal
envelope. Fine tuning was by adjusting the voltage on the top cap. Cathode??
Oh, yeah, the tool used to coarse tune this little hummer must be insulated.
Lethal (or nearly lethal, in my case) voltage is right on that blasted
square headed screw.
Lynn, W7LTQ

RLucch2098 wrote:

Hi All;
Can anyone tell me what this tube is or used for?
I've seen it before but forget now :-)
Please e-mail me directly @

Pics
http://www.myradioroom.com/oddwetube1.jpg
http://www.myradioroom.com/oddwetube2.jpg
Tnx & 73.......Rich WA2RQY

Looks like the 723AB reflex klystrons that I have in my basement.
Mine had been used as local oscillators in 10 GHz radar units.
(3 cm)

7 3
Reed - VE1NU

---------------------

Looking for information on Marconi SMR-3 and
Northern Electric R8119A receivers.

RLucch2098 wrote:

Hi All;
Can anyone tell me what this tube is or used for?
I've seen it before but forget now :-)
Please e-mail me directly @

Pics
http://www.myradioroom.com/oddwetube1.jpg
http://www.myradioroom.com/oddwetube2.jpg
Tnx & 73.......Rich WA2RQY

Looks like the 723AB reflex klystrons that I have in my basement.
Mine had been used as local oscillators in 10 GHz radar units.
(3 cm)

7 3
Reed - VE1NU

---------------------

Looking for information on Marconi SMR-3 and
Northern Electric R8119A receivers.

Claudia & Reed Park wrote:



RLucch2098 wrote:

Hi All;
Can anyone tell me what this tube is or used for?
I've seen it before but forget now :-)
Please e-mail me directly @

Pics
http://www.myradioroom.com/oddwetube1.jpg
http://www.myradioroom.com/oddwetube2.jpg
Tnx & 73.......Rich WA2RQY

Looks like the 723AB reflex klystrons that I have in my basement.
Mine had been used as local oscillators in 10 GHz radar units.
(3 cm)

7 3
Reed - VE1NU

---------------------

Looking for information on Marconi SMR-3 and
Northern Electric R8119A receivers.

I think Western Electric made this same type tube for 4 and 6 GHz
as well as 10 GHz. AT&T had equipment that operated in the 10.700
to 12.500 GHz range (Those freq. are close if not exact).

Bill K7NOM

Claudia & Reed Park wrote:



RLucch2098 wrote:

Hi All;
Can anyone tell me what this tube is or used for?
I've seen it before but forget now :-)
Please e-mail me directly @

Pics
http://www.myradioroom.com/oddwetube1.jpg
http://www.myradioroom.com/oddwetube2.jpg
Tnx & 73.......Rich WA2RQY

Looks like the 723AB reflex klystrons that I have in my basement.
Mine had been used as local oscillators in 10 GHz radar units.
(3 cm)

7 3
Reed - VE1NU

---------------------

Looking for information on Marconi SMR-3 and
Northern Electric R8119A receivers.

I think Western Electric made this same type tube for 4 and 6 GHz
as well as 10 GHz. AT&T had equipment that operated in the 10.700
to 12.500 GHz range (Those freq. are close if not exact).

Bill K7NOM