Re: [neonixie-l] FS: 5 NOS 5870

[David Forbes]

Yes, JRC is Japan Radio. But did they have a Nixie tube factory, or did
they print their name on tubes made by another company? These tubes were
made using rather sophisticated methods, and the tooling would be rather
unique.
Did JRC make Nixie tubes? Did Burroughs make Nixie tubes in Japan?
(I just popped the back off a c.1960 five tube radio made by Monarch in
Japan, and it is full of Matsushita tubes.)
It's an interesting question.





On Sat, Aug 20, 2022, 5:15 PM Charles MacDonald  wrote:

> On 2022-08-20 14:25, David Forbes wrote:
> > Max,
> > Thanks for the photo. These JRC tubes look very similar to Japanese
> > Burroughs B-5870 tubes. It's likely they were made in the same factory,
> > but I don't know whose factory it was.
>
> JRC?  (Japan Radio Company)
>
> --
> Charles MacDonald  VA3CPY
>

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RE: [neonixie-l] Self-introduction & tube trading

[Michail Wilson]

Very kewl.

I'm interested in your 5971 project.  😊
A lot of work might already be done for you if you look at SmartSockets.

Michail 

-Original Message-
From: neonixie-l@googlegroups.com  On Behalf Of 
Duncan Townsend
Sent: Saturday, August 20, 2022 6:53 PM
To: neonixie-l@googlegroups.com
Subject: [neonixie-l] Self-introduction & tube trading

Hello everybody!

I'm Duncan, an American software engineer by day and vacuum tube enthusiast 
when I'm not distracted by other things. I have an unreasonable number of 
pokers in the fire right now, but they include:

* a clock based on each of J.B. Dance's Electronic Counting Circuits
   chapters (how low can I get the active part count without involving
   silicon components?)
* tuning fork timebase for the above clocks
* 1j24b (Russian subminiature rod pentode) CPU
* 1j25r (even smaller than 1j24b) headphone amplifier

In particular, I'm interested in hearing from the experts what kind of fun 
tube-based displays I might've overlooked for the 1j24b CPU. My current plan is 
5971 13-segment tubes (I'm too poor for that many 7971s), but I don't really 
know what's out there.

===

I'm also interested in trading to get some of the tubes I admire for their 
aesthetics. I consider the National NL-90X series (NL-900 no decimal,
NL-901 left decimal, NL-902 right decimal, NL-908 both decimals) as well as the 
Ericsson GR10N tubes some of the most beautiful ever manufactured and would 
love to trade for/buy some. I have a large number of enormous
ICL1-1/7 VFDs as well as some tiny National NL-4998 nixies for trade. I also 
have the above mentioned sub-subminiature Russian tubes (1c38a triode, 1c38a-q 
Chinese variant triode, 1j25r pentodes, and tg5r
thyratron) as well as their slightly less sub- brethren (1c1a triode, 06p1a 
pentode, 1t1a thyratron) for anyone who wants to build out their collection of 
oddities.

--Duncan

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[neonixie-l] Self-introduction & tube trading

[Duncan Townsend]

Hello everybody!

I'm Duncan, an American software engineer by day and vacuum tube 
enthusiast when I'm not distracted by other things. I have an unreasonable 
number of pokers in the fire right now, but they include:


* a clock based on each of J.B. Dance's Electronic Counting Circuits
  chapters (how low can I get the active part count without involving
  silicon components?)
* tuning fork timebase for the above clocks
* 1j24b (Russian subminiature rod pentode) CPU
* 1j25r (even smaller than 1j24b) headphone amplifier

In particular, I'm interested in hearing from the experts what kind of fun 
tube-based displays I might've overlooked for the 1j24b CPU. My current 
plan is 5971 13-segment tubes (I'm too poor for that many 7971s), but I 
don't really know what's out there.


===

I'm also interested in trading to get some of the tubes I admire for their 
aesthetics. I consider the National NL-90X series (NL-900 no decimal, 
NL-901 left decimal, NL-902 right decimal, NL-908 both decimals) as well 
as the Ericsson GR10N tubes some of the most beautiful ever manufactured 
and would love to trade for/buy some. I have a large number of enormous 
ICL1-1/7 VFDs as well as some tiny National NL-4998 nixies for trade. I 
also have the above mentioned sub-subminiature Russian tubes (1c38a 
triode, 1c38a-q Chinese variant triode, 1j25r pentodes, and tg5r 
thyratron) as well as their slightly less sub- brethren (1c1a triode, 
06p1a pentode, 1t1a thyratron) for anyone who wants to build out their 
collection of oddities.


--Duncan

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Re: [neonixie-l] FS: 5 NOS 5870

[Charles MacDonald]

On 2022-08-20 14:25, David Forbes wrote:

Max,
Thanks for the photo. These JRC tubes look very similar to Japanese 
Burroughs B-5870 tubes. It's likely they were made in the same factory, 
but I don't know whose factory it was.


JRC?  (Japan Radio Company)

--
Charles MacDonald  VA3CPY   Stittsville Ontario
cm...@zeusprune.ca  Just Beyond the Fringe
No Microsoft Products were used in sending this e-mail.

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Re: [neonixie-l] FS: 5 NOS 5870

[David Forbes]

Max,
Thanks for the photo. These JRC tubes look very similar to Japanese
Burroughs B-5870 tubes. It's likely they were made in the same factory, but
I don't know whose factory it was.


On Fri, Aug 19, 2022, 3:19 PM Max DN  wrote:

> David,
>
> see attached a picture of the B-5870 by JRC.
>
> John had sent it to me as I was looking to purchase the Nixies, but
> shipping cost + import charges from the US to the UK would make them
> expensive for me (I use them for my nixie watch hobby).
>
> Regards,
> Max
>
> --
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> 
> .
>

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[neonixie-l] Re: FS: 5 National NL807 nixies w/sockets-Correction

[John]

Correction- There are FOUR tubes/5 sockets not. Price is 100$ shipped and 
double boxed in Conus.
John

On Saturday, August 20, 2022 at 12:43:56 PM UTC-4 John wrote:

> I have 5 of these tubes with sockets. The sockets appear to have been 
> desoldered from a board, and I have no info on the state of the tubes, 
> other than they strike as they should. I've tested at least one segment of 
> each one.
>
> These are listed in Nationals literature as *"Super" (.808" char) long 
> life*.
>
> I will ship these double boxed in continental US for $120
>
> If I'm way out of line on price and/or if you would like pictures, please 
> let me know.
>
> John
>

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[neonixie-l] FS: 5 National NL807 nixies w/sockets

[John]

I have 5 of these tubes with sockets. The sockets appear to have been 
desoldered from a board, and I have no info on the state of the tubes, 
other than they strike as they should. I've tested at least one segment of 
each one.

These are listed in Nationals literature as *"Super" (.808" char) long life*
.

I will ship these double boxed in continental US for $120

If I'm way out of line on price and/or if you would like pictures, please 
let me know.

John

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[neonixie-l] Not a clock

[artgod...@googlemail.com]

https://hackaday.com/2022/08/19/ro%cc%86%cc%bdta-counting-with-style/

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Re: [neonixie-l] HVPS in parallel

[Max Di Noi]

Hi Richard, David, I'm using my design of the NCH8200HV, it's mostly its 
replica as I wanted to embed the design in my board and I'm not bothered about 
the 'not invented here' syndrome as I'm not selling commercially. 'Sinking' the 
HVPS into a pcb cutout is a good idea though, I had seen that too. I thought 
about allocating each neon of the colon to a different power supply but I'm 
using the colon made by Dalibor and it has only one anode and two cathodes, 
so...I may add a separate power supply just for the colon and I have a trimmer 
resistor on each power supply (thanks for the suggestion David) to adjust 
brightness before doing anything via software. You are right that turning on 
'1' and '1' (say for Hours) on the same power supply may have different 
brightness than '4' and '8' on the other supply (say for Minutes). I'll be 
using different resistors for each digit as suggest by Dalibor, there could 
still be a small difference in brightness, but I'm not planning to solve for 
that. I don't think it's noticeable, if it is, I'll adjust from software, but 
there are many combinations to consider, so that's definitely overkill.Of 
course I have and I can use one big power supply for everything but I'm trying 
to keep the final case as thin as possible.
 Original message From: David Forbes  
Date: 20/08/2022  06:42  (GMT+00:00) To: NeoNixie  
Subject: Re: [neonixie-l] HVPS in parallel I would hope that your power 
supplies have regulated voltage, correct? Therefore they should both be the 
same voltage, within the tolerance of the voltage determining components, if 
the supply design has good load regulation. In the worst case, provide a 
voltage trimmer on one supply so that you can adjust it to balance the 
brightness of both sections.You may want to do that even in the case of equal 
loads, since a 1% difference in HV voltage will make about a 5% difference in 
cathode current due to the fact that the dropping resistor works over a small 
fraction of the HV voltage. On Fri, Aug 19, 2022, 3:12 PM Max DN 
 wrote:Hello,As mentioned in one of my previous posts, 
I'm building a nixie clock with Dalibor's RZ568M tubes.If I build a clock with 
4 tubes and 1 colon divider, then I am not sure if I should allocate 2 tubes + 
1 colon to a power supply and 2 tubes only to the other power supply. If I do 
so, the brightness in the 2 tubes only will be different than in the 2 tubes 
connected to the colon. I could use PWM to adjust brightness but let's assume 
that I just do direct drive with no PWM.




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