Suprise new project! Tele-Tone. TV-149 !

[Yamamaya42]

Originally Posted by timmy

Looks similar to the vt71 series Motorola

Most likely a clone of it,

And that's a Sansui 1000EA in the background.

[Yamamaya42]

Question is, what to replace that ugly 18 ohm sandbar resistor with once I replace that selenium rectifier with modern diode, random guess is 180 ohms, but what does people who have done these sets think?

[Yamamaya42]

the HV transformer look OK

http://suzaku.live-evil.org/20260406_202205.jpg

Except for the wire to the Rect tube broke.
It's very brittle

http://suzaku.live-evil.org/20260406_202224.jpg
that cap down there is shot.

[timmy]

Originally Posted by Yamamaya42

the HV transformer look OK

http://suzaku.live-evil.org/20260406_202205.jpg

Except for the wire to the Rect tube broke.
It's very brittle

http://suzaku.live-evil.org/20260406_202224.jpg
that cap down there is shot.

Looks don’t always mean good until it works

[timmy]

Those black caps were probably the best back in the day

[Yamamaya42]

resistance check of where that wire SHOULD go, to ground, checks OK, meaning the main HV coil is good.

For lack of any better idea, I will try a 180 ohm resistor in place of the 18, when I replace the selenium rect with a modern diode.

[bandersen]

No, that's much, much too large. I'd leave the 18. It's there for surge protection.

[timmy]

Originally Posted by Yamamaya42

resistance check of where that wire SHOULD go, to ground, checks OK, meaning the main HV coil is good.

For lack of any better idea, I will try a 180 ohm resistor in place of the 18, when I replace the selenium rect with a modern diode.

So you’re going to add a resistor while replacing the selenium so why don’t you check the voltages without putting a resistor in if you do need it ok you may not. All my Motorolas got silicon diodes and none of them have a resistor the voltages are all where they should be. You never know with the resistor it may be low.

[Yamamaya42]

Originally Posted by timmy

So you’re going to add a resistor while replacing the selenium so why don’t you check the voltages without putting a resistor in if you do need it ok you may not. All my Motorolas got silicon diodes and none of them have a resistor the voltages are all where they should be. You never know with the resistor it may be low.

Replacing a selenium with silicon diodes always causes a raise in voltage, due to the better rating of the silicon diode.

I have 20 ohm 10w I will try, it should be ok, with the higher voltage from the SI diode.

[timmy]

Originally Posted by Yamamaya42

Replacing a selenium with silicon diodes always causes a raise in voltage, due to the better rating of the silicon diode.

I have 20 ohm 10w I will try, it should be ok, with the higher voltage from the SI diode.

Well yes voltage usually goes up with the change but all my sets never did

[Yamamaya42]

Most places say to add 100 ohms when you remove a selenium and replace it, anyway, I'm out of large adapt-A-caps T_T, I used 4 in my sansui, need more now.
Oddly enough, the 18 ohm sandbar was OK, still gonna replace it with a 20, and the 680 ohm was bad, REALLY bad, 1.2k ohms bad.

[timmy]

How many watts is the old 18 ohm

[Yamamaya42]

SAMS says 5w for the 18, and 1w for the 680, though they look to be bigger due to they are old dogbone sand types.

[Yamamaya42]

first cap done.
http://suzaku.live-evil.org/20260408_194417.jpg
http://suzaku.live-evil.org/20260408_194444.jpg

Waiting for more adapt-A-Caps

[Yamamaya42]

On the front of resistors, not sure yet, but there's prob goanna be a lot bad in the set, a random check of R64, which sams says to be a 150 ohm 1w, power to audio out, (brown, red, brown, silver 120 ohms 1/2 w) tested at 187 ohms.

Not sure why a 1/2w was in there, 6L6GTs (25V version) like their power for output, gonna replace it with at least a 1w 120 ohm when I do that cap.