Hello.
On Sat, May 22, 2021 at 9:22 AM 'Ian Vine' via neonixie-l <
neonixie-l@googlegroups.com> wrote:
> Any chance the documentation could be shared to all?
>
> Thanks Ian
>
Aliexpress proposed me the kit today even if it is sold out. At the bottom
of the description (https://bit.ly/3yNgelV)
UPDATE 2: Both boards are complete, everything connected together. I was
unable to get a visible trace on the CRT. Voltages seem correct, but for
some reason the fuse protecting the filament blew out. Filament did not
blow as confirmed by continuity. I need to investigate further, and will
Hello.
My boards take about 10W input, that is ~800mA at 13V. Without a CRT
connected the current drops to ~470mA.
A word of caution to current builders. Q6, Q9, Q12 and Q15 (all MPSA44) on
the PSU board get pretty hot. I measure 60°C on the top of their plastic
case! Even without a CRT
For copyright reasons I wont post them; the seller emailed them to me
within 24 hours so if you dont have them in your kit, be sure to contact
them so they know about the problem.
On Saturday, May 22, 2021 at 12:22:17 AM UTC-7 iavine wrote:
> Any chance the documentation could be shared to
Any chance the documentation could be shared to all?
Thanks Ian
> On 22 May 2021, at 04:14, Bill Stanley wrote:
>
>
> OK, that was quick. Opened the box, all parts appeared to be in good shape,
> but no documentation of any kind. If I could prevail on the other builders
> for a copy of
OK, that was quick. Opened the box, all parts appeared to be in good shape,
but no documentation of any kind. If I could prevail on the other builders
for a copy of the instructions/schematics, it would speed up my build.
Thanks;
-Bill-
On Friday, May 21, 2021 at 6:23:56 PM UTC-7 Bill
Toss another kit on the barbie
My kit arrived today so I will be building it over the weekend. Watching
the comments closely.
-Bill-
On Friday, May 21, 2021 at 5:14:24 PM UTC-7 gregebert wrote:
> I have an Aneng UT61e; cheap but quite good. One of my scopes has a pair
> of 100x probes
I have an Aneng UT61e; cheap but quite good. One of my scopes has a pair of
100x probes that lets me look at a few kV, but I was too lazy to bring it
up today. If I run into problems I'll post some screenshots.
After installing the diff-amp transistors and Q1, current-drain increased
to 360mA.
Paying full attention - what model DMM do you have if you can't directly
connect it? I have an 87V I'm happy to connect as it's rated for 1KV.
On Friday, May 21, 2021 at 11:38:27 PM UTC+1 gregebert wrote:
> UPDATE 1: I built the power supply/driver board and completed some basic
> testing. I
UPDATE 1: I built the power supply/driver board and completed some basic
testing. I installed all components EXCEPT the transistors for the diff-amp
that drives the CRT. The standby current at 12V is zero. The HV supply can
be enabled by grounding the POWER_ON signal; that causes the inverter
I've been checking over solderjoints, hoping to find a Q or U with a
solderbridge, no luck.
Ah, I hadn't made the connection - I found your build guide before, it's
what made me decide to order one. It's been useful for making A or B
comparions for anything standing out.
I've also been
John,
pictures of my build are here:
https://ik1zyw.blogspot.com/2020/10/kit-oscilloscope-clock-8sj31j-review-3.html
The code on the HV board is the same. I think I reversed a 79Lxx, but the
smell of it burning was too obvious and I cannot tell what the effect was
on the CRT.
I do get
60V on the indicator bulb (NL1) indicates the transformer is being driven,
but you cant tell if the HV is high enough; can you measure VCC_300 to see
if it's in the ballpark ?
Can you scope-out pins 1 & 2 of the transformer to see what kind of
waveform is present for the filament supply ?
Hello.
Is the filament glowing visibly after one minute of power on?
Is the filament fuse still good? Can you confirm current flows there?
If all above check positive, in dark room do you see the green shade of the
beam out of the screen?
My kit draws less than 2A, I am quite sure. 650 mA go
Tried it with a 12V 3A and 12V 4A power supply, can't get either 8SJ31J
tube I have to light up from turning R21 Intensity.
Both power board orange bulb and control's red led light up though,
I've ordered a 12V 5A power supply hoping that'll sort it.
On Wednesday, 19 May 2021 at 21:31:08 UTC+1
Forwarded the documentation on, rotary control board turned up, I'm on to
calibration
On Wednesday, 19 May 2021 at 20:01:19 UTC+1 gregebert wrote:
> My kit arrived today WITHOUT instructions. Damn! If anyone has an
> electronic copy, please let me know. I'm contacting the seller. Nothing I
My kit arrived today WITHOUT instructions. Damn! If anyone has an
electronic copy, please let me know. I'm contacting the seller. Nothing I
could find on their website. But at least I dont have to worry about the
CRT connections because they prewired it for me.
On Tuesday, May 18, 2021 at
Assembled all of it & somehow managed to misplace the rotary control board.
They've made a few near-substitutions in the parts list, notably the XYZ
board part #46 - 1 piece 510K is now a 1M resistor, this was the last one I
soldered, presuming uprated intentionally.
There's a few more with
Replying to myself: since I couldn't attach, I've put two photos online:
https://possob.xs4all.nl/sylvania/
Any help is appreciated!
Iwan
On Tuesday, May 18, 2021 at 7:14:56 PM UTC+2 Pruttel wrote:
> Since this is a CRT topic, I thought I'd ask it here: I got a rectangular
> Sylvania CRT at
Since this is a CRT topic, I thought I'd ask it here: I got a rectangular
Sylvania CRT at a HAM flea market quite some time ago, but I cannot find
any info on it. I wanted to attach a photo of the tube + label, but the
google website won't let me? The type is SC3015P1B, serial 2391113.
Ahh, my mistake - the filiment pins 14 and 1 are next to each other - the
other diagram above showed a gap between 14 and 1. The pin numbers are
nicely moulded in the base if you remove the socket.[image: Tube End.PNG]
The tube has pins 6 and 13 absent from the tube, and the wired-up socket
When you get your kit can I check the socket wiring with you? Mine doesn't
match the wiring for the 8SJ31J in the seller's datasheet, but is
pre-soldered & heatshunk and already on the tube. I'm worried they made an
off-by-one error wiring it up.
On Saturday, 15 May 2021 at 05:53:11 UTC+1
Most likely, the error is in the text description in the instruction
manual. From the datasheet, pin 9 is the multi-anode connection, and pin 5
is the single anode. I am more likely to follow the connections to specific
pin numbers in the instructions, rather than the text-description. Pin 9 is
I'm trying to figure out how it's put together before I start soldering.
As Paolo mentioned the only mystery part is the transformer T-SC-1 on the
parts list - it looks like a custom order. I don't know how to characterise
it without destructively pulling it apart, and unfortunately they don't
Huh, ebay auction says 12V 5A, a previous aliexpress page gives much lower
values for amperage:
https://www.aliexpress.com/item/4001142939399.html
I'm assuming it's the same design from the pictures
On Wednesday, 28 April 2021 at 20:18:53 UTC+1 John Snow wrote:
> The kit was previously
The kit was previously 'avalible' from aliexpress for £56.44, but it was
from a seller that held no stock - got refunded as unable to ship.
That was minus the tube though, the current ebay link includes the 8SJ31J
but lacks a power supply (12V 5A centre+)
Unsure on lifespan of tube.
On
They actually seem very cheap to me...
On Wednesday, April 28, 2021 at 12:56:00 PM UTC-4 John Snow wrote:
> There's another 4 of the 8SJ31J kits listed at
> https://www.ebay.co.uk/itm/265139148431 , I've ordered one on the
> offchance they have them in stock, also the seller has feedback for
What is the life expectance for this tube?
___
On Wednesday, April 28, 2021, 08:23:17 PM GMT+3, John Snow
wrote:
There's another 4 of the 8SJ31J kits listed at
https://www.ebay.co.uk/itm/265139148431 , I've ordered one
Thanks for the tip; I just bought one. I'll post an update + video after I
get it and build it.
On Wednesday, April 28, 2021 at 9:56:00 AM UTC-7 John Snow wrote:
> There's another 4 of the 8SJ31J kits listed at
> https://www.ebay.co.uk/itm/265139148431 , I've ordered one on the
> offchance
There's another 4 of the 8SJ31J kits listed at
https://www.ebay.co.uk/itm/265139148431
, I've ordered one on the offchance they have them in stock, also the
seller has feedback for selling them previously.
Bit of a premium tho, and only avalible with tube.
On Wednesday, 16 December 2020 at
Have you looked at these kits?
https://oscilloscopeclocknixiecrt.com/Kit.htm
Sent from my iPhone
> On Dec 16, 2020, at 00:17, John Snow wrote:
>
> I've tried to get that one from Aliexpress previously, but they later
> refunded me saying they weren't getting any more stock.
>
>> On
I've tried to get that one from Aliexpress previously, but they later
refunded me saying they weren't getting any more stock.
On Friday, 11 December 2020 at 21:42:35 UTC Pramanicin wrote:
> Did anyone else on the list buy one of those recent CRT clock kits that
> was listed on eBay?
>
> like
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