Unknown Canadian Marconi Television.

[Ruru]

Howdy Folks, It's been awhile since i used the forum but i do loves oogling over all the stuff posted.

That said, Today i purchased a Marconi Vacuum tube television from the flea market.. The attachments below are the photos i took of it back at my work area inside my house. It WAS plugged into the power at the flea market. I did not personally do it, I only heard about it after the fact, It was only 10 buckeroos so i thought i'd give er a try.

What i was told about the symptoms it's experiencing is, It turns on, It makes noise, there is no picture, they are unsure if that's because the tube is dead, and or, it might have a radio function, and they might've only turned on the Radio,
I am not personally interested in plugging it in and fiddling around with it to find out until the capcitors at the very least are changed. That said, If anyone could help Identify the television at all, That would be killer, Schematics or a manual would be PERFECT.

The Only information i've gotten from the television itself is, the back cardboard cover that goes on the back calls the Model TV - 2831. and the Serial number is 2495 There is a Patent dated to 1938-1955.

the Chassis casing has seen better days, It is SUPER faded. i believe it is a 'A' Chassis, from what i can makeout on it, otherwise i'm pretty clueless.

That would lead me to believe it's a mid 50s television, but that would just be my guess, It is a Canadian television.

Also. completely dumb question. there is no spring windings inside the television unlike with my RCA new vista telly from the 60s. If i were to discharge the tube which realistically would be the only way I'd be comfortable working on it, I would ground the discharging tool (insulated screwdriver with alligator clip/electical tape) to the Metal chassis frame, Or is there something special i'd have to do? I've done aton of times with arcade monitors, and consumer televisions. i've just never done it on one with no specifically dedicated spot to.

[ronl]

Hi Ruru. You can discharge the picture tube clipping to that copper strip left of the yoke.the metal chassis is most likely ok to discharge as well.I might have your service info this set.ill check and get back to you in a day or so. RonL

[ronl]

Hi Ruru.I have the service info for your tv.RCC manual # 19. Looks like your set is from 1956.pm me an email address to send scans to and ill get to it in a day or so. RonL

[Ruru]

Thank you Ronl ^^ Message sent, Take your time~

[Electronic M]

One thing that's advisable on HV discharge is to put a 1M in series with the lead to ground and hold it there for about 20 seconds.

Most CRTs will experience dielectric bounce back (they'll recover most of their previous HV) a few seconds to a minute after a dead short discharge...the resistor and patience minimizes bounce back.

I've lost count of the times I've been bit by bounce back, and I've forgotten to discharge and been bit by that too..... It's downright pleasant (the voltage and charge are roughly equivalent to a really good static zap from your houses doorknob in winter) compared to touching a yoke winding or the top cap of a horizontal output in a color set with it running (those will burn a small hole in your skin).

[ronl]

Good point Electronic M.I got bit a few times with bounce back too.I scanned and emailed your service info Ruru.I had time today.let me know if any pages need rescanning. RonL

[Ruru]

Got it all discharged. It's laying on it's side ontop of my table using blankets and towels to support it upright. Though at the time of writing this i put it back flat down as i accomplished everything i could so far. Cleaned up all the insulation and as much of the filth as i could on the inside. Will continues again once i'm not so lightheaded.

For the moment i took some pictures of all of the capacitors as i could. One of them crumbled immediately unfortunately. I could not figure out the value of it,

Here's a bunch of photos with their values based on what i can tell.

Self Explanatory



80 MFD - 250V?
60 MFD - 250v?


MFD v
25 350
10 350
15 450
100 50


.01 MFD - 600V
.01 MFD - 600V


0.05uf 600v
0.1mfd 1000v


0.1uf 200v


5MFD 50V


.05mfd 600v


0.03uf 600v
.1mfd 600v


.1(unsure) 600V


.02 mfd 400 V
0.03uf 600V



4,700pf 750v
4,700pf 750v
4,700pf 750v


10MF 450V 525VSP?

15k 10w Sand Resistor i should probably change.


3.900pf - 500v

[Ruru]

.05? 600v
.056? 600V
.047mfd 600v
.047mfd 600v


And the mystery one i don't know what is.
It had A05 i think 400V listed on it from what i made out but touching it in the slightest just made it fall apart. I'm assuming it might be a .05mfd 400v cap? But that would be my honest guess.



Any help is appreciated as you can imagine i'm just taking shots in the dark and seeing what sticks.