Dark vertical stripes between color bars?

[zenithfan1]

Hey! My pattern generator does that! Cool.

[Phil Nelson]

So, how do you imagine my old TV would display this pattern?

Phil

[John Marinello]

Test signal is called multi burst.

[bkharris]

Phil

Your Sencore VA-62 has this pattern.

[old_coot88]

Phil,
On several occasions, I've seen "ringyness" in the video caused by the last IF tube. You might try subbing it just as a shot in the dark. Have you checked the IF tubes for shorts/gas? Bill(oc)

[old_tv_nut]

Originally Posted by old_coot88

Phil,
On several occasions, I've seen "ringyness" in the video caused by the last IF tube. You might try subbing it just as a shot in the dark. Have you checked the IF tubes for shorts/gas? Bill(oc)

I wasn't sure if an IF tube could cause this - thanks for the info.

[Phil Nelson]

Originally Posted by bkharris

Your Sencore VA-62

Oh no, you said the name that must not be spoken in this house

I got disgusted with my VA62A and put it away quite a while ago. Last I remembered, it made colorless color bars on new and old TVs. I hauled it out today and it hasn't reformed. Plus, it makes a wicked, slowly rolling horizontal fold on my tube TVs.





The same CTC-11 shows OK color bars with no fold when I hook up my humble Leader pattern generator.



VA62A makes the same rolling fold on the older TV.





It's a poor workman who blames the tool. Perhaps I'm doing something stupid with the VA62A, but I simply got tired of horsing around with it. Meanwhile, the Leader generator makes useful patterns without any fuss.

Phil

P.S. The final photo shows the pattern that VA62A calls "multiburst bar sweep."

[old_tv_nut]

Originally Posted by John Marinello

Test signal is called multi burst.

Strictly speaking, multiburst has groups (bursts) of vertical stripes, each burst having a particular constant frequency of stripes, while "sweep" changes frequency continuosly left to right - but they have similar use, testing the frequency response of the video.