Teletone verticle size

[old_coot88]

Could somebody post a schematic of the circuit area where the 6X5 is used?

[timmy]

Originally Posted by old_coot88

Could somebody post a schematic of the circuit area where the 6X5 is used?

Not sure anyone has one but the picture of the set in the SAMs under teletone tv208 in early television is what I have but like I said it's clearly different. I would like to see the right schematic for this set too.

[jr_tech]

Originally Posted by old_coot88

Could somebody post a schematic of the circuit area where the 6X5 is used?

Well if they did use the circuit of the TV-149 in the 208, it should be something like this:

http://www.earlytelevision.org/pdf/T...Sams-56-22.pdf

Perhaps Timmy could trace out the circuit around the 6X5 and 25Z6 and draw a schematic showing how the power supply is wired. Again I ask, does the set actually work or at least do the filaments light up with the 6X5 installed?

jr

[timmy]

Originally Posted by jr_tech

Well if they did use the circuit of the TV-149 in the 208, it should be something like this:

http://www.earlytelevision.org/pdf/T...Sams-56-22.pdf

Perhaps Timmy could trace out the circuit around the 6X5 and 25Z6 and draw a schematic showing how the power supply is wired. Again I ask, does the set actually work or at least do the filaments light up with the 6X5 installed?

jr

No it's not working yet I'm in the process of recapping so if there are any problems later I'm sure I won't be able to rely on the schematic that's out there now. I was just looking into these tubes because they are the source of b+ along with one selenium which will be replaced with a 1n4007 diode later. And now he reign that the 6x5 is known for cathode shorts so there is nothing like a reliable silicon diode and maybe leave the tube in for show, long as it still lights. This is just in case later on I will have this info to do if I could not obtain these tubes. Kind of a backup plan, alternate.

[old_coot88]

I was puzzled over the references to the 6X5 being "used as a ballast". Does that mean the diodes are paralleled and used in lieu of a nichrome wire dropper tube?

[jr_tech]

Originally Posted by old_coot88

I was puzzled over the references to the 6X5 being "used as a ballast". Does that mean the diodes are paralleled and used in lieu of a nichrome wire dropper tube?

I don't think that anybody indicated that the tube was actually used as a ballast, only that it occupied the same socket location as was occupied by the ballast in later sets.
I would love to see a schematic for the set that Timmy has, but very likely the schematic is close/same as that of the TV-149, which has an 80 ohm dropping resistor in the heater circuit and also a selenium rectifer as well as the 25Z6 and 6X5.

jr

[init4fun]

Originally Posted by timmy

No it's not working yet I'm in the process of recapping so if there are any problems later I'm sure I won't be able to rely on the schematic that's out there now.

I hope this means your intentions are to get this set working perfectly in it's original configuration , and then when it's working perfectly as designed you will consider any modifications ? Restored correctly , the circuit will function as it's manufacturer intended , and that should be the baseline from where any modifications to the power supply are considered .

Myself , I'd restore it to what I'd call 99.5% original , I'd leave all the tube circuits alone modification wise and use a modern diode (with resistor) in place of the Selenium (which would remain on the chassis but with both of it's wires run to a terminal strip)

As you've already noted , this set has no power transformer to roast , so there really is no need to play "hot potato" with the 6X5 here .

[timmy]

Originally Posted by init4fun

I hope this means your intentions are to get this set working perfectly in it's original configuration , and then when it's working perfectly as designed you will consider any modifications ? Restored correctly , the circuit will function as it's manufacturer intended , and that should be the baseline from where any modifications to the power supply are considered .

Myself , I'd restore it to what I'd call 99.5% original , I'd leave all the tube circuits alone modification wise and use a modern diode (with resistor) in place of the Selenium (which would remain on the chassis but with both of it's wires run to a terminal strip)

As you've already noted , this set has no power transformer to roast , so there really is no need to play "hot potato" with the 6X5 here .

Yes I always restore what was there originally including tubes however if a specific tube was not available I would like another option in place to replace a tube if possible which in this case I can do so if needed. And it's possible to just use a modern diode without a resistor because what I sometimes do is the resistor in series with ac I will up the ohms for both the diode, increased voltage which is only a few volts and also the increase in line voltage which seems to vary from area to area. The aim here for me is to always get a set working the way it was intended and what annoys me because it always has to be perfect while I don't consider myself a perfectionist , I want it right, even down to the flow of solder, it don't look right I do it again.