Motorola ts907 low hv

[timmy]

Yes I seen it I’ll get it and this chassis has an rca type plug from the tuner that plugs directly into the chassis right at the first IF and that subber looks like it has rca on the back.

[Yamamaya42]

Originally Posted by timmy

Yes I seen it I’ll get it and this chassis has an rca type plug from the tuner that plugs directly into the chassis right at the first IF and that subber looks like it has rca on the back.

Yes, that type of “RCA” IF connection is universal on most sets of the era, not sure when it became a standard.

[Electronic M]

Originally Posted by Yamamaya42

Yes, that type of “RCA” IF connection is universal on most sets of the era, not sure when it became a standard.

On TV IFs I think it started to become common in the mid-late 50s. It never was standard on TV tuners. Many brands simply had a couple of solder stakes to solder the coax to the tuner and that was a common cost saving measure up until the combined tuner/IF systems of the solid state era.

The RCA jack as a standard connector for consumer coax applications (primarily audio) dates back to pre-WWII IIRC.

[timmy]

Ok I had enough of this set I bought that subber hope it works so I’ll know if the tuner is bad or the IF is bad.

[Yamamaya42]

And if it turns out that your IF section is hopelessly borked / misaligned, you always have the option of bypassing it all and going direct A/V input, this of course would require making a small 2 transistor simple video amp to boost the standard 1v video level to the 5v that this TV expects at the 1st video amp tube grid, otherwise things will look washed out, and sound can be easily added in on the volume control plug.

[timmy]

That tuner subber don’t have a fine tune is it crystal controlled so that channel 3 is 3 aside from having the gain control. Or I could have a power supply to power the subber and leave that in circuit but I would rather keep it original if I can.

[Yamamaya42]

Originally Posted by timmy

That tuner subber don’t have a fine tune is it crystal controlled so that channel 3 is 3 aside from having the gain control. Or I could have a power supply to power the subber and leave that in circuit but I would rather keep it original if I can.

I have the 4-c version.

http://suzaku.live-evil.org/0922222215.jpg

that other one prob DOES have fine tuning, note the difference in the tuning nob, the wider control behind the one you got may be fine tuning.

[timmy]

The 190v problem is solved had a bad resistor

[jr_tech]

Originally Posted by timmy

The 190v problem is solved had a bad resistor

So it is now putting out 190 volts?
Which resistor was bad?

jr

[Yamamaya42]

Originally Posted by jr_tech

So it is now putting out 190 volts?
Which resistor was bad?

jr

R93 had changed value to 800 ohms, from 560k, believe it or not

[zeno]

Originally Posted by Yamamaya42

R93 had changed value to 800 ohms, from 560k, believe it or not

Two other common examples of resistors going down. All IIRC numbers.
GE 18" S-1 compactron POS sets had an 8.2K 2W that went way down.

Sylvania 19" hybrids two 56K 2W that went between the high B+ & the
24 V for the color ckts. They went down & smoked lots of stuff in
the color.
Other than those I cant remember any other fails with ohms going DOWN.
On Motos I do remember big brown resistors in the demod opening
& giving missing colors.

73 Zeno
LFOD !

[Electronic M]

Originally Posted by zeno

Two other common examples of resistors going down. All IIRC numbers.
GE 18" S-1 compactron POS sets had an 8.2K 2W that went way down.

Sylvania 19" hybrids two 56K 2W that went between the high B+ & the
24 V for the color ckts. They went down & smoked lots of stuff in
the color.
Other than those I cant remember any other fails with ohms going DOWN.
On Motos I do remember big brown resistors in the demod opening
& giving missing colors.

73 Zeno
LFOD !

Soinds like the D-12 Sylvania chassis they put that chassis in consoles too.

[timmy]

There seems to be a lot of believe it or nots with this set.

[timmy]

It’s almost as if the 6hq5 rf amp tube in the tuner is bad or extremely weak I have a sub I’m Going to try.

[timmy]

Well I hope it works after all it’s from around 1974 I don’t want to have to fix it to get it to work lol.