another Marantz 18 resurrected, well almost, scope problem

[ausman1000]

So I got c2611 transistors to replace the 34-1006 on the scope board. I can't figure out the pinout install. So do they replace with same pinout or do I have to install them upside down under the heat sink? Which is it? View attachment 1045562

Mount like the original and yes lead config is the same (meaning like for like lead pinout/config). Someone in a thread led me to believe it is different but it is not so. I checked using an Atlas DCA 55. Trust me, mine is up and running as you have seen.

 

[ausman1000]

As you mount each one make sure the collector insulator kit is doing it's job. I used the original and all is fine. You should measure (after mounted) infinite resistance between collector lead and heatsink.

 

[PooPoo]

As you mount each one make sure the collector insulator kit is doing it's job. I used the original and all is fine. You should have (after mounted) 0 ohms between collector lead and heatsink.

Installed the c2611 as you indicated and still no scope?

 

[PooPoo]

As you mount each one make sure the collector insulator kit is doing it's job. I used the original and all is fine. You should have (after mounted) 0 ohms between collector lead and heatsink.

Still no scope after c2611 installed can you think of anything else that might be wrong?

 

[PooPoo]

Installed the c2611 as you indicated and still no scope?

You think those orange resistors under the trim pots might be burnt? The board looks kinda burnt under those orange things.

 

[ausman1000]

View attachment 1045612
You think those orange resistors under the trim pots might be burnt? The board looks kinda burnt under those orange things.

I suggest you start a separate thread to address the issue, you will get a lot more help that way (more eyes on the subject). Use the words Marantz and scope in your title!

 

[RV59]

Someone in a thread led me to believe it is different but it is not so.

Would you mean that I say anything?
Seriously, I have a big doubt now.
My scope works very well with the transistors installed as in the picture.
And I installed it myself.
So either they are not 2SC2611, or they are 2SC2611 with a different pinout.
I need to check that...

 

[PooPoo]

I suggest you start a separate thread to address the issue, you will get a lot more help that way (more eyes on the subject). Use the words Marantz and scope in your title!

Yeah I should huh? Ok

 

[PooPoo]

Would you mean that I say anything?
Seriously, I have a big doubt now.
My scope works very well with the transistors installed as in the picture.
And I installed it myself.
So either they are not 2SC2611, or they are 2SC2611 with a different pinout.
I need to check that...

Did you install your upside down ?

 

[txturbo]

Sorry to bring up an old thread.

Ya learn something new everyday.
The NOS scope I have is a plug and play substitute for the original however the model number is different, it is a D3-111GM and the original a D3-11GJ. l looked up the specs of both and the heater current for the GM is 92mA versus 300mA for the GJ. Further research finds that the GM was designed for battery operated devices (makes sense, lower current draw). I plugged the GM into my model 19 and found that even though the scope works fine the heater glow is so dim it is only barely visible in a very dark room. The replacement for my shot Q1203 hasn't arrived yet but I have hope that when it does and with a NOS scope installed we will be back in business.
pic of the NOS scope
View attachment 1038657

I picked up a D3-111GM scope last year as well. I noticed the scope will not focus to a sharp point. Also the decay time on the phosphor seems a bit longer.

Have you noticed anything like this?

 

[ausman1000]

Sorry to bring up an old thread.



I picked up a D3-111GM scope last year as well. I noticed the scope will not focus to a sharp point. Also the decay time on the phosphor seems a bit longer.

Have you noticed anything like this?

Agreed on both points. Display not as defined/focused as original.

 

[clinic-audio]

So I got c2611 transistors to replace the 34-1006 on the scope board. I can't figure out the pinout install. So do they replace with same pinout or do I have to install them upside down under the heat sink? Which is it? View attachment 1045562

your picture is about one original HITACHI transistor and so , in this case , you have (when you watch it on top side with letters ) : ECB
A 2SC2611 made by HITACHI with different pin out do not exist , so if you get another result , these transistors are not made by HITACHI !
easy , no ?

 

[txturbo]

I played around for a while with the scope. I think the voltages are wrong for this tube type. Not sure yet if the resistor values can be adjusted. At first I thought it just needed a bit more voltage for focus however I can now see that the tube is blooming when the intensity is adjusted. Not sure if this is inherent to this tube's phosphor decay time or if the voltage is off. If I turn the intensity down I can get a nice sharp point.

 

[bktheking]

http://www.fragjanzuerst.de/eindex.htm?/r5.htm

Pics for reference, one is more sharper.

 

[rBuckner]

^^^ Cool website Brad!

 

[bktheking]

Thanks Mr.Buckner!

 

[Widzew83rts]

Can you help me to fix the scope, the scope light up on the back bo nothing shop up on the front

 

[Widzew83rts]

Should i start to replace 2sc2611? If yes should i replace all of them or just broken one after a take out and messure them

 

[tonebells]

Take a look at this Marantz 18 scope not Working how to check if scope is faulty.

Tony

 

[Widzew83rts]

hi, i have a problem with scope , everything was fine for about couple months than right now i can not center the light in a scope, any one knows if should i replace Q1202,1203, 1205,1206?