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The trace on the screen begins in the middle of it. I suspect the horizontal preamp 155-0124. Can someone help me? Does anyone have such a circuit? Thank you

It would help if you'd tell us what 'scope model you have and what you did to come to your conclusion.
All kinds of things may be wrong. E.g. did you check the connections to the horizontal plates?

Raymond

Did you check the connections to the plates, as Raymond suggested?

Sent from my iThing, so please forgive typos and brevity.

Hello,
Sorry to answer you so late but I got a little confused in this site that I recently discovered.
Yes, I have tested these connections and even the horizontal amp which is working properly.
I always come back to the horizontal preamp, the input signals are good and the output signals bad. All DC voltages are OK. Raymond put me in touch with someone who has a 155-0124.
I await the delivery.

Hi,

I once repaired a 2215 with similar problems.
The description of that repair is here:

/g/TekScopes/message/164497

Good luck with your repair,

Leo

Hello,
I did pretty much the same thing to check the horizontal amp. I removed the horizontal preamp and I injected two triangular signals in opposition of phase in the pins 2 and 7.
The spot moves horizontally in both directions. I concluded that the horizontal amplifier is good as well as all that follows.