7 Mar
2020
7 Mar
'20
11:10 p.m.
trying to identify these soviet resistors anyone familiar with how they
marked them i see 620 on these ones for the panel bulbs
https://www.flickr.com/photos/1ajs/49633358106/in/dateposted-public/
want to test all the lamps with power but i dont know where to start with
testing.
i see markings for 220V on the power feed plug
https://www.flickr.com/photos/1ajs/49621260392/in/dateposted-public/
bulbs
https://www.flickr.com/photos/1ajs/49623473996/in/dateposted-public/
https://www.flickr.com/photos/1ajs/49623475146/in/dateposted-public/
7 Mar
7 Mar
11:26 p.m.
On 2020-Mar-07, at 11:10 PM, Adrian Stoness via cctalk wrote:
trying to identify these soviet resistors anyone
familiar with how they
marked them i see 620 on these ones for the panel bulbs
https://www.flickr.com/photos/1ajs/49633358106/in/dateposted-public/
want to test all the lamps with power but i dont know where to start with
testing.
i see markings for 220V on the power feed plug
https://www.flickr.com/photos/1ajs/49621260392/in/dateposted-public/
bulbs
https://www.flickr.com/photos/1ajs/49623473996/in/dateposted-public/
https://www.flickr.com/photos/1ajs/49623475146/in/dateposted-public/
Are they neon lamps or filament (incandescent) lamps?
It would seem a little odd to be using neon lamps like that on a solid-state machine but
it's not impossible.
As for R value, you have a multi-meter don't you?
Why are you being so shy, hiding the good stuff from us?:
https://www.flickr.com/photos/1ajs/49620991591/in/dateposted-public/
11:35 p.m.
yea i do but its not giving me anything thats making sens the value jumps
all over the place. on the ones ive tried
lamps not sure how u tell what they are no marking on them rather tiny
join the discord u woulda seen it there
11:44 p.m.
Adrian Stoness via cctalk wrote:
trying to identify these soviet resistors anyone
familiar with how they
marked them i see 620 on these ones for the panel bulbs
https://www.flickr.com/photos/1ajs/49633358106/in/dateposted-public/
want to test all the lamps with power but i dont know where to start with
testing.
i see markings for 220V on the power feed plug
https://www.flickr.com/photos/1ajs/49621260392/in/dateposted-public/
bulbs
https://www.flickr.com/photos/1ajs/49623473996/in/dateposted-public/
https://www.flickr.com/photos/1ajs/49623475146/in/dateposted-public/
Not mutch to see on your pictures..better photos?
The Lamps seems to be neon lampes and at 220V the only resitor volue
that makes sense and has a 620 in it is 620K.
The resistors could be labeled with 620k or witn M620.
Regards,
Holm
--
Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe,
Freiberger Stra?e 42, 09600 Obersch?na, USt-Id: DE253710583
info at tsht.de Fax +49 3731 74200 Tel +49 3731 74222 Mobil: 0172 8790 741
8 Mar
8 Mar
12:20 a.m.
not seeing anything els other then the 620
hard to get any decent shots of them with out a macro lens though
as for the lamps if i wanted to test them one at a time would i just give
them 12V directly? or would it be lower dont have a variable power supply
atm just an old pc one
On Sun, Mar 8, 2020 at 1:44 AM Holm Tiffe <holm at freibergnet.de> wrote:
Adrian Stoness via cctalk wrote:
trying to identify these soviet resistors anyone
familiar with how they
marked them i see 620 on these ones for the panel bulbs
https://www.flickr.com/photos/1ajs/49633358106/in/dateposted-public/
want to test all the lamps with power but i dont know where to start with
testing.
i see markings for 220V on the power feed plug
https://www.flickr.com/photos/1ajs/49621260392/in/dateposted-public/
bulbs
https://www.flickr.com/photos/1ajs/49623473996/in/dateposted-public/
https://www.flickr.com/photos/1ajs/49623475146/in/dateposted-public/
Not mutch to see on your pictures..better photos?
The Lamps seems to be neon lampes and at 220V the only resitor volue
that makes sense and has a 620 in it is 620K.
The resistors could be labeled with 620k or witn M620.
Regards,
Holm
--
Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe,
Freiberger Stra?e 42, 09600 Obersch?na, USt-Id: DE253710583
info at tsht.de Fax +49 3731 74200 Tel +49 3731 74222 Mobil: 0172 8790 741
1:35 a.m.
On 2020-Mar-07, at 11:35 PM, Adrian Stoness wrote:
yea i do but its not giving me anything thats making
sens the value jumps all over the place. on the ones ive tried
If the Rs are high value, set the MM to the 2Mohm range and make sure your fingers are not
touching the metal circuit elements / test probes.
At high-R you and your fingers will be a conductive path and the R will vary with your
finger pressure and give erratic readings.
lamps not sure how u tell what they are no marking on
them rather tiny
Incandescent lamps have two riser wires that diverge at the top with a filament inbetween
them, neon lamps of that size usually have two thick parallel 'posts' inside
them.
On 2020-Mar-08, at 12:20 AM, Adrian Stoness via cctalk wrote:
as for the lamps if i wanted to test them one at a
time would i just give
them 12V directly? or would it be lower dont have a variable power supply
atm just an old pc one
No 5V on the PS?
12V could be too much or too little. You could try it very briefly, or you could try
putting a (say) 100 ohm R in series with the lamp and 12V to limit the current and see if
you get any illumination. Ideally, measure the voltage across the 100 ohm R, if the
voltage drop is 0, it's a burned out incandescent lamp or they're neon lamps.
12:18 p.m.
Adrian
Congrats on your panel! It is very impressive!
On the Russian resistors I saw, the value was what is written on it. If you can?t measure
them, maybe there is some conformal coating or corrosion on the leads? You?d need to
scratch that off.
For the lamps, it might be time to invest in a variable power supply. Usually I start low
(3V) and go up from there. The IBM ones are meant to be under-voltaged - at their voltage
rating they are not glowing very bright.
Marc
On Mar 8, 2020, at 7:38 AM, Adrian Stoness via cctalk
<cctalk at classiccmp.org> wrote:
?not seeing anything els other then the 620
hard to get any decent shots of them with out a macro lens though
as for the lamps if i wanted to test them one at a time would i just give
them 12V directly? or would it be lower dont have a variable power supply
atm just an old pc one
> On Sun, Mar 8, 2020 at 1:44 AM Holm Tiffe <holm at freibergnet.de> wrote:
>
> Adrian Stoness via cctalk wrote:
>
>> trying to identify these soviet resistors anyone familiar with how they
>> marked them i see 620 on these ones for the panel bulbs
>> https://www.flickr.com/photos/1ajs/49633358106/in/dateposted-public/
>>
>> want to test all the lamps with power but i dont know where to start with
>> testing.
>>
>> i see markings for 220V on the power feed plug
>> https://www.flickr.com/photos/1ajs/49621260392/in/dateposted-public/
>>
>> bulbs
>> https://www.flickr.com/photos/1ajs/49623473996/in/dateposted-public/
>> https://www.flickr.com/photos/1ajs/49623475146/in/dateposted-public/
>
> Not mutch to see on your pictures..better photos?
>
> The Lamps seems to be neon lampes and at 220V the only resitor volue
> that makes sense and has a 620 in it is 620K.
> The resistors could be labeled with 620k or witn M620.
>
> Regards,
>
> Holm
>
> --
> Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe,
> Freiberger Stra?e 42, 09600 Obersch?na, USt-Id: DE253710583
> info at tsht.de Fax +49 3731 74200 Tel +49 3731 74222 Mobil: 0172 8790 741
>
>
20 Mar
20 Mar
11:14 a.m.
On Sun, 8 Mar 2020, Curious Marc via cctech wrote:
On the Russian resistors I saw, the value was what is
written on it. If
you can?t measure them, maybe there is some conformal coating or
corrosion on the leads? You?d need to scratch that off.
At least in the 1980s they used R, K or M respectively as a decimal point
and unit designator both at a time. So say M56 would be 0.56M?, 1K5 would
be 1.5k? and 22R would be 22?. On some parts the designation could be
split between lines.
FWIW,
Maciej
8 Mar
8 Mar
2:47 p.m.
On March 8, 2020 at 3:20 AM Adrian Stoness via cctech
<cctech at classiccmp.org> wrote:
not seeing anything els other then the 620hard to get any decent shots of them with out a
macro lens though
as for the lamps if i wanted to test them one at a time would i just givethem 12V
directly? or would it be lower dont have a variable power supplyatm just an old pc one
On Sun, Mar 8, 2020 at 1:44 AM Holm Tiffe <holm at freibergnet.de> wrote:
> Adrian Stoness via cctalk wrote:> > trying to identify these soviet resistors
anyone familiar with how theymarked them i see 620 on these ones for the panel
I found this document from the CIA in the 50s about Soviet parts:
https://www.cia.gov/library/readingroom/docs/CIA-RDP80-00809A000700030074-5…
Doesn't say much, but indicates they used either the numeric value printed on the
resistor or the same color code we use.
If the lamps are incandescent you should be able to measure the resistance of the
filament, which would likely be in the 100 ish ohm range. A neon bulb should measure open
(infinite) I believe.
If the lamps are incandescent, the R could be to lower the voltage/brightness. You could
try that resistor already there plus various values of resistance in series with the lamp
to see if lights and how bright. Or a pot. With a 12V supply and a 1K R in series you
couldn't push more than 12mA through it. I would suspect that would be plenty safe.
Will
1738
days inactive
1750
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8 comments
6 participants
participants (6)
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bhilpert＠shaw.ca -
curiousmarc3＠gmail.com -
holm＠freibergnet.de -
macro＠linux-mips.org -
tdk.knight＠gmail.com -
wrcooke＠wrcooke.net