Sorry but I don't have any schematic for it, neither any original circuit. I just experimented with them to see if I could get them to do something after I had succeeded with the RYG10.
I read every bit of documentation that I could find on normal Trochotrons from LM Ericsson and Burroughs and just adjusted the component values from these papers/designs to the operating parameters of these Russian types, always starting at the high end of resistor values to make sure that I didn't blow anything up with excessive current. Since I didn't have any original magnets I just tried what I had, much like with the RYG10, I used a magnet from a broken Burroughs Trochotron there. What I learned from the RYG10 is that you need a uniform magnetic field in the center of the Trochotron, that's why I placed one magnet on top and one on the bottom of the LP-4 &LP-5. The LP-6 has its own external magnet surrounding the tube, much like a Burroughs /Ericsson trochotron. Do read the datasheet properly as there are both negative and positive voltages present, both stationary voltages and also pulsed voltages. The LP-4 & 5 are prone to breaking where the pins enter the tube, the pins are quite hard and easily break the glass if they are bent. I have a few that arrived broken even though they were ok when shipped, the old boxes don't offer much protection and should be filled upp with some dampening material before the tubes are shipped. I learned some stuff on the RYG10 from a gentleman who actually worked on the RYG10 when it was made ready for production at LM Ericsson in the 1950's and he told me to always keep the current flowing through the trochotron just low enough for operation as excessive current would destroy the cathode material as well as the plates and guide electrodes inside the tube quite fast. On Saturday, 7 November 2020 02:34:36 UTC+1, peter bunge wrote: > > Thank you Martin, I searched on this group but got no hits. > Is there a schematic of the LP-4 setup. I have one coming which should > have the data sheet included which will be a starting point but components > and values would be strictly guessing. > Peter > > On Fri, Nov 6, 2020 at 5:09 PM Dekatron42 <[email protected] > <javascript:>> wrote: > >> Yes, I had the LP-4, LP-5 and LP-6 up and running a few years ago, >> however I never had the correct magnets nor the correct sockets (if there >> are any) for the LP-4 & LP-5. They are all similar to the original designs >> made by the inventor Hannes Alfvén and the group of people around him at >> the Swedish Royal Institute of Technology (KTH in Swedish). If you haven't >> downloaded the papers written by hannes Alfvén and his colleagues I can >> recommend you to do so, they can be found here: >> https://groups.google.com/forum/#!msg/neonixie-l/QyGXStAkPW0/aG30K9EWBgAJ. >> LM ericsson bought the right to the Trochotrons invented by Hannes Alfvén >> and SER (Svenska ElekronRörsfabriken) produced the RYG10 (the development >> samples were named AD-3 & AD-4 that eventuelly resulted in the RYG10) >> >> I used some AlNiCo magnets I got from speakers and also from other dead >> Trochotrons to get them to run, one mounted below and one on top to get a >> uniform magnetic field, when it comes to components I experimented with the >> values used for the LM Ericsson/SER RYG10 and got them to run after some >> tweaking but I never came across any original drawings or photos where they >> were shown in use. >> >> /Martin >> >> On Friday, 6 November 2020 20:52:49 UTC+1, peter bunge wrote: >>> >>> Has anyone actually used one of these? >>> Does anyone have a picture of this tube with the magnet installed? >>> Anyone have working schematics? >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "neonixie-l" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/518d31e3-55e0-4d5a-9215-28887f7ae5e0o%40googlegroups.com >> >> <https://groups.google.com/d/msgid/neonixie-l/518d31e3-55e0-4d5a-9215-28887f7ae5e0o%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/aebd459b-0d89-4291-9a66-46742313ba67o%40googlegroups.com.
