Can you take pictures of datasheets?
One is most probably 4J1L.
4Ж1Л, Tube 4Ж1Л; Rohre 4Ж1Л ID19750, Vacuum Pentode
The other looks like 6П6С, i.e. 6V6GT
One is most probably 4J1L.
4Ж1Л, Tube 4Ж1Л; Rohre 4Ж1Л ID19750, Vacuum Pentode
The other looks like 6П6С, i.e. 6V6GT
Last edited:
remember, nuclear bombs are 1940's technology.
they bought the technology/blue prints and just copy it.
It was not about nuclear EMP. The plant released new machines with obsolete electronics, they were behind the schedule. Belenko supposed to steal the newest one. If he stole a new machine with new electronic as it supposed to be, Japan would not know about 6S33S existence, so it would have the same fortune as 4P1L, GU-50, 4P10S, and other wonderful tubes that are better for audio than 6S33S, but less popular. Actually, 6S33S tubes fit perfectly into Japanese OTL amps. Nobody could imagine then that they will be used in SE amps, especially for headphones.
IF it hits. Decoys and countermeasures are probably more effective against those old kliunkers than something a bit more modern (“I think they used to call them transistor sets” - Lt. Montgomery Scott). When stuff is still classified it’s a wee bit harder to get ahold of images of the guts. And somebody would have shut it down by now.
But the military is always going to be at least a bit behind in technology. It takes what, three months from a set of specs to the next generation smart phone to come off the production line? Military can’t even get the paperwork signed in that amount of time let alone build hardware.
Agree,
It would seem that plates and grids are much less susceptible to an EMP than low voltage thin substrate PN junctions..
Jim
Not to argue, just a little bit of History about obsolete missiles with tube electronics.
Soviet S-125 Neva/Pechora missiles were designed in 1961 😱
Some kills or heavy damage they achieved (as in plane barely returning to base but landing "dead stick" because of almost total loss of hydraulic power):
* 1970-73 Egypt Soviet battalions of S-125 17 Shooting (35 missiles) shot down nine Israeli and one Egyptian planes. ... Israel recognized the 5 F-4 Phantoms (1 more was W/O and in 1973 another 6 😱
10 downed planes with only 35 missiles fired is IMPRESSIVE.
* 1980 While the SAAF reported two Mirage F1 were damaged by SAMs during this action, Angola claimed to have shot down four
* 1991 Iraq: F-16 shot down, during Operation Desert Storm.
a B-52G was damaged by a missile.
* 1999 Yugoslav Army shot down an F-117 Nighthawk stealth attack aircraft during the Kosovo War, another also used to shoot down a NATO F-16 fighter
* 2020, American sources state that a second F-117A was targeted and damaged during the campaign, allegedly the aircraft returned to Spangdahlem base, but it supposedly never flew again
* 2015 US MQ-1 Predator drone was shot down by a Syrian Air Defense Force S-125 missile
* 2018, American, British, and French forces launched a barrage of 103 air-to-surface and cruise missiles targeting eight sites in Syria. The Russian military claimed that thirteen S-125 missiles launched in response destroyed five incoming missiles.[18] However, the American Department of Defense stated no Allied missiles were shot down.
I would split the difference 😉
* 2020 still deployed in Nagorno-Karabaj war.
My point? Or relation to thread?
That "OBSOLETE" Tube Electronics still hold their own in the Military sphere. 😎
Not Mojo but actually SHOOTING DOWN PLANES, some 60 years after first deployment.
I would not despise those North Korean tubes by any means.
To boot, now situation is reversed, but in the 40s, 50s, 60s, North Korea was technologically and industrially more advanced than South Korea. 😱
Impressive.
And that is how we got the 6C33B-C!
Tubes might be handy if there is an EMP from a nuclear explosion....
Not to mention that a single fighter costs anywhere from 50 to 100 times as much as a single missile.
Do the math.
Jan
Perhaps the sale of these tubes could be managed through a group buy?
Their intrinsic value is probably greater to the tinkering masses, willing to experiment and able to adapt to manufacturing tolerances?
Their intrinsic value is probably greater to the tinkering masses, willing to experiment and able to adapt to manufacturing tolerances?
And, the cost of a human plus training (not insignificant at USD big six figures/air hour) raises this ratio substantially. We're one generation away from Robots Rules of Order.
Even in the very early 1970s, the US Army in Vietnam and Korea (front line, best equipment) still used vacuum valve electronics for all of the telephone backbone. It was all mountaintop-to-mountaintop RF in the VHF range, and used SSB multiplexed (frequency stacked) modulation in older installations like Korea and PCM (all electron valves!) in later installs like Vietnam.
Who knows what's in a B52? Nobody that would say, fersure. And they've been around longer than most of us. Militaries, quite properly I'd think, love predictability. In an unpredictable world.
YOS,
Chris
Especially if one of them turns out to be just a re-badged Russian 6SN7 equivalent. Those just sound very good to my ears.
New terrorist weapon - distract the enemy with audiophile quality sound that there compelled to stop and listen to.
30,000 tubes don't just slip across the border unnoticed by the DPRK. And if the DPRK is involved, you don't want to touch them. 
Well, they might have been shipped in the 1980's. In the late 1970, China withdrew its support to Albania. Albania had aging Chinese equipment and replacement parts weren't coming anymore, so they might have gone to North Korea.
But that's just speculation.
But that's just speculation.
30,000 tubes don't just slip across the border unnoticed by the DPRK. And if the DPRK is involved, you don't want to touch them.
Those tubes may all be a member of the Internet Of Things ;-)
Jan
Yes: In next gen urban warfare they're referred to as HK's- Hunter Killer cells
Last edited:
During 'Desert Storm' / 'Gulf War' in 1990-91, "state of the art" US military HF radios were failing because the aggregate static charges of many sand particles blowing past antennas were building up substantial voltages and taking out solid state receiver front ends. The US Military pulled large quantities of Collins KWM-2 all-tube HF transceivers out of depot storage and put them into service.
Radio Mart redux | Page 3 | QRZ Forums