Collapsed vertical picture in Motoral 1959

I am visiting a friend in Cincinnati and decided to investigate his old Motoral. Sound is great, brightness is great, horizontal fills screen, but vertical is collapsed. I have lots of caps of various pF with me, and connected them across the old paper ones, improved the sound and brightness. But no vertical.

I don't have access to Sams facts until Monday. Any ideas?

[Notimetolooz]

Turn the brightness down or you could burn a line into the screen.
Check the vertical sweep oscillator and output tubes.

[zeno]

Hopefully its not one of the Motos that used modules. That aside if there are no voltages WAY off the problem is usually in the feedback loop. That runs
from the V output plate back to the V osc grid. Several caps & resistors there, usually a bad cap.

73 Zeno
LFOD !

Nope, no modules. The only problem I have is the method they layer smaller components under larger, so making access is a pain.

How much over voltage is too much for caps under 1 pF? These are running around 100-400 vdc, a few at 600 and 1000.

All my caps are 630 vdc, they were a 'grab bag' of same voltage, different cap values.

[zeno]

Small pf value disc cap are rarely a problem. I wouldnt change any
unless they were cracked or undoubtably bad. Many Zenith tube
radios used them & they never went bad like papers etc. As for
voltage ratings stay at or above the OEM. If need be you can
sub an underated one for a quick test.

73 Zeno
LFOD !

[Electronic M]

There's no point putting new caps less than 1pf in parallel with vertical circuit caps for testing....most original vertical caps will be 1000x-100,000,000x the capacitance, and the circuit won't notice the sub 1% change.

I may then remove the new caps for brightness, because adding them made it impossible to turn the level below a strong glowing silver line.

I wonder if the set actually needs minimal work, perhaps it is thr vertical only; except I cannot get the horizontal to narrow enough between the left and right edges. It leans right with a brighter left side than right.

[DavGoodlin]

A chassis number may help me look up your particular circuit. I just restored a TS556, dated 4M59 and vertical output tube is a 5AQ5, of all types.

This is with 3 new tubes, an oscillator, mixer and vert something...

The new caps may be over powering?

[Electronic M]

Originally Posted by BandDirector

This is with 3 new tubes, an oscillator, mixer and vert something...

The new caps may be over powering?

Have you adjusted the height, linearity and centering?...those controls could have been cranked up to compensate for dying tubes before and now need to get walked back to match current parts.

I did. Spent a good 20-30 minutes messing with the controls. I may do a little fiddling again later. It is too bright even when turned down, the contrast won't darken when it is turned down, etc.

Much much much better. However the fine tuning is seized up, loose to the left, tight to the right. Picture is clearer, contrast and brightness work, took about an hour to practice slowing the tuning of the controls.

Sound is garbled due to tuning in the vcr. May need a new mixer tube

[dieseljeep]

Originally Posted by DavGoodlin

A chassis number may help me look up your particular circuit. I just restored a TS556, dated 4M59 and vertical output tube is a 5AQ5, of all types.

I always had a high regard for the Motorola sets built at the time. Even the less expensive models where good performers. I have two in my collection.
I always wondered why some tubes were series types, even though the set had a transformer. The Motorola service news stated that it reduced the inventory of tubes that the manufacturer and the servicer had to stock.

[Notimetolooz]

You need to identify the model or chassis so we can help more.
Changing random parts is not going to get this TV working right.
You will need to check voltages, starting with the CRT pins.

The chassis number is in pic #2 a few posts back, I am well aware of the need for that information to help, thank you.

It is RTS 5448 01, followed by 7M58.

The 8s look like Bs if that helps.