Hello..my first TV

[Donj]

Took a small rest to digest all my Easter eggs, now onto the electrolytics .. My original plan was to do the terminal strip trick, however, this huge uncluttered chassis is so stuffed with components in the one area I need access to that I will be restuffing..
The two top units in the photo are quads with so many wires attached that its going to take me most of the afternoon just to mark things up so I can get them out. I just finished restuffing the single unit on the bottom. It is the 2000 mfd unit tied into the selenium rectifier which I have already mentioned earlier in the thread. The one ohm resistor attached to that one actually still measures correctly.
I am still wondering if I should replace that selenium while the chassis is on the stand. The fact that it is such a low voltage and current unit has me wondering if its still good for the long haul, but I would hate for it to fail a short way down the road. Thoughts?

[Dubis7]

I'd say better to do it now than have to haul the chassis out again later, since it's already a known failure point.

[old_coot88]

Seleniums don't age well. I'd replace it with Si diodes. Then if the supply is outputting more than 6.3 VDC under load, bump up the value of the 1 ohm resistor as needed.

[Donj]

Tomorrow's task... Just as the schematic shows for the selenium I expect... ac in at both anodes and dc out at the junction of the two cathodes?
(my inexperience is showing..

[old_coot88]

Originally Posted by Donj

Tomorrow's task... Just as the schematic shows for the selenium I expect... ac in at both anodes and dc out at the junction of the two cathodes?

Yupp. And with Si diodes, the banded end is cathode.

In the future you'll probably encounter seleniums having a + sign on the cathode, which seems dumb as heck. The only rationale would be "The B plus comes outa here"

[Yamamaya42]

Originally Posted by old_coot88

Yupp. And with Si diodes, the banded end is cathode.

In the future you'll probably encounter seleniums having a + sign on the cathode, which seems dumb as heck. The only rationale would be "The B plus comes outa here"

they taught us how to remember diodes LONG ago in electronics class, " A = arrow for anode "

also the mnemonic for resistor color codes that was VERY un-PC

[Donj]

Thanks guys..

[Donj]

Another question. With all the interconnect wires coming out of the chassis, I failed to notice, until now, a somewhat random looking wire emerging through a non-factory looking hole on the rear of the chassis. No connector, in fact no exposed conductor. Tracing the wire to its source, I find it attached to the plate of the 6AL5 "clamper" tube. Now, the socket of this tube is enclosed in a screwed down metal shield so access for any reason would necessitate first removing the shield. I am wondering if this was added sometime in the set's life to enable plate voltages to be measured for service purposes..
Stupid question...Should I just leave it hanging out? Could leaving it there possibly introduce any instability due to the fact that it originates in a shielded part of the circuit?
Also, the 1/2 watt resistor that is also attached to pin 2 is reading high , about 2.3 meg should be 1.5 meg according to schematic was getting ready to change and just looked at the parts list to confirm the power rating. Parts list call for 3.9 meg. I suppose I should go with what's already there. I'm colour blind but wifey confirms its brown, green, green.

[old_coot88]

The 6AL5 is associated circuit-wise with a 6SN7 (V11). What circuit is this in? Sync?

[Donj]

The 6SN7 is the phase inverter/clipper sync separator circuit

[old_coot88]

Originally Posted by Donj

...a somewhat random looking wire emerging through a non-factory looking hole on the rear of the chassis. No connector, in fact no exposed conductor. Tracing the wire to its source, I find it attached to the plate of the 6AL5 "clamper" tube.

To venture a guess, maybe it was a test point that someone wanted to monitor with a scope.

[Donj]

Coot,
Another demonstration of what you know that I don't .
Dug into a portion of the manual that is way beyond me at this point and found the attached... Since I don't even have a 'scope at this point, I guess I wouldn't be doing any harm by removing the mystery wire.

[EdKozk2]

Donj's set is a Canadian version of a GE 811. I recapped a GE 811 last fall.
The GE 810 is also the same except for crt placement. The 25 cycle power supply is the variation in schematics.
Ed

[Donj]

Pretty much at the point of powering this set up to see what happens. Just wondering if prior to doing so, I should run the CRT on my tester for a few hours to "wake it up".
It did test OK on my Sencore 465 but I have no idea how OK it actually is. (photo in my first post)

[Notimetolooz]

Hook it up to the TV and go. It tested fine.