Why no love for this GE roundie ? - Page 17 - Videokarma.org TV - Video

Findm-Keepm · #**241** 01-20-2015, 09:27 PM

I've got two 6.8K film resistors, each 7 watts. Series would give you ~ 13.6K. For postage, they are yours - wait until you receive them to pay me.

Cheers,

tvcollector · #**242** 01-20-2015, 10:18 PM

Quote:

Originally Posted by dtvmcdonald

You don't have to use series combos. Parallel works fine too.
For example, use a 15k 10 watt film, readily available
cheap from Mouser (some are odd shape) in parallel with a
regular film 2 w 100k.

Or use three 56k 2 watt in parallel with one 47k or 51k 2w.
Or don't worry and use 5 68k 2 watt in parallel.

When paralleling, don't stick them right up against each
other, give them some cooling air.

That's all a bit confusing and too much.. Would be much better with one slightly up or down in resistance or two that would make the correct value or close.. Besides that 15k 10watt solar panel looking resistor from mouser you are talking about would not fit or go very well.. Isn't the original green one in there wirewound? it sure looks it, or at least it may be a ceramic one..

I've done google searches with no luck.. Only other option I can think of is Moyers, if they sell resistors..

tvcollector · #**243** 01-20-2015, 11:31 PM

Quote:

Originally Posted by Findm-Keepm

I've got two 6.8K film resistors, each 7 watts. Series would give you ~ 13.6K. For postage, they are yours - wait until you receive them to pay me.

Cheers,

Thanks.. That would be the better option...

tvcollector · #**244** 01-26-2015, 10:34 PM

I installed the other electrolytic with the bracket, did a nice clean install, and now the transformer hums real loud.. Sounds like the transformer behind the HV cage, connected to side of chassis.. There was lines on the screen (Hum bars).. I hooked all wires correctly as checked numerous of times.. I converted back to the way I had it previously.. Those caps started sparking.. Now the set just sits there and hums, and now it's completely dead..

Electronic M · #**245** 01-26-2015, 11:12 PM

Before you ever touched that can, were the metal can tabs connected directly to the metal chassis or were they connected to a brown insulator that was it's self riveted to the chassis?

Some cans (especially B+ doubler lytics, and cans in sets with a B- rail) are designed so that their negative terminal/can is not wired to the chassis (floating can), but some other supply terminal/rail at a voltage different than the chassis.

If you connect the a can that was meant to float at a different voltage than chassis potential to the chassis it will royally mess up power supply operation, and disturb many other circuits.

tvcollector · #**246** 01-26-2015, 11:17 PM

Cans tabs were directly connected to the chassis.. I reverted back once again to the rebuilt electrolytic... Set powers up, than once a few seconds of warming up, major hum comes from one of the transformers, then sound and screen come on, major wavy pic and color bars, and screen doesn't fill all the way, and then I start to smell something burning... Kinda smells like oil burning...

Gregb · #**247** 01-26-2015, 11:53 PM

Sounds like maybe one of your replacement caps might be in backwards.

Gregb

tvcollector · #**248** 01-27-2015, 12:52 AM

Diagnosing the chassis I noticed this...

tvcollector · #**249** 01-27-2015, 01:05 AM

It's defiantly that.. I have a magic marker wedged in between the two to make connection and powered back up like this, and it runs normal again... Isn't this something that could be bought at the local Radio Shack? A thermistor I believe.. I tell ya, I've been having the worst luck when restuffing the cans, second time I have done this with something else becoming a problem..

DaveWM · #**250** 01-27-2015, 07:53 AM

just reconnect the cut red wire and move on.

Electronic M · #**251** 01-27-2015, 12:17 PM

If your set has a degauss coil built-in then that is likely the humming sound you heard with that thermistor open.

If you see any BPC CRT sets at the curb you might be able to grab a free thermistor out of one. Da Shacq might carry thermistors or might not, you will have to check.

old_coot88 · #**252** 01-27-2015, 12:57 PM

Quote:

Originally Posted by tvcollector

...Set powers up, than once a few seconds of warming up, major hum comes from one of the transformers, then sound and screen come on, major wavy pic and color bars, and screen doesn't fill all the way, and then I start to smell something burning... Kinda smells like oil burning...

That smell was likely from the degauss varistor, the larger disc next to the open thermistor.
The auto-degauss coil, if shut off abruptly, likely will have left the CRT in a "gaussed" state, depending on where on the AC wave the disconnect occured when you pulled the plug (or hit the off switch).

tvcollector · #**253** 01-27-2015, 04:01 PM

I ordered a few thermistors from Mouser, so I'll have a few on hand.. Radio Shack doesn't carry those anymore.. I called Moyers and they happened to have the varistor GE part number.. I ended up getting that in case I ever need it.. Also he has the 13K 7watt metal film resistor I needed, and ended up getting that also..

Findm-Keepm · #**254** 01-31-2015, 07:20 AM

Quote:

Originally Posted by tvcollector

I ordered a few thermistors from Mouser, so I'll have a few on hand.. Radio Shack doesn't carry those anymore.. I called Moyers and they happened to have the varistor GE part number.. I ended up getting that in case I ever need it.. Also he has the 13K 7watt metal film resistor I needed, and ended up getting that also..

So I guess you don't need the resistors I sent you?

How much did Moyers charge for the varistor?

Findm-Keepm · #**255** 01-31-2015, 07:47 AM

Quote:

Originally Posted by Electronic M

If your set has a degauss coil built-in then that is likely the humming sound you heard with that thermistor open.

If you see any BPC CRT sets at the curb you might be able to grab a free thermistor out of one. Da Shacq might carry thermistors or might not, you will have to check.

Most later model sets have a thermistor with a lower resistance at 25 degrees C - something like 12-20 ohms cold. Most tube sets (and indeed his set) have thermistors rated at 120 ohms cold. The Workman FR191 was the universal tube degaussing thermistor for large screen sets. Others, such as Ambassador, MidAmco bargains, and Oneida also made the universals, and even kits (FRTV and others) with the Varistor. RCA's 107191 was the same 120 ohm thermistor - we bought them from the distributor about 20 at a time for about a buck or two.

For BPC sets, you sometimes have a three-lead thermistor. Again, we either used an RCA 143596 (replaced the old 141238), or bought the cheapie Samsung "boxy" three lead. For all other two leaded thermistors for BPC sets, you couldn't beat the price on the LGE (actually Zenith) 063-10710/A thermistors.

I cringe at the folks buying the 24.95 kits off ebay - that guy is a rip-off.......

Cheers,