I'm calling it close enough. The previous owner had turned every var/cap/resistor available and he may sneak into your lab and turn your too. Lock your doors.
/g/TekScopes/photo/59361/3?p=Name,,,20,1,0,0
Hey guys. I have done a lot of work to this 465. I had initially planned on selling it to help me buy some plugins for my 7633. I decided I don't want to sell it and am keeping it. Today I checked its rise time with a pg506 fast rise. Both channel 1 and 2 closely resemble each other and they are not close to right. Before I start trying to calibrate this thing, does it look like there is some type of component issue left to fix? I am thinking since both channels are so alike there is something wrong besides just out of calibration.
Raymond Domp Frank
Jun 18 #148963
On Mon, Jun 18, 2018 at 05:06 am, lop pol wrote:
Seeing that are both channels are essentially the same just seems weird to me.
The vertical output Amp and some other parts, like parts of the channel switch, are common.
Raymond
You have the proper fast rise generator to perform an adjustment. The risk in my opinion is that you destroy a stuck trimcap or trimpot.
You might first verify DC levels in the output amplifier stages and perhaps symmetry in the push-pull signals. Often some stages are common-base current driven which makes it more difficult to check signals.
Unlike some other manuals the 465 manuals do not tell which part of the curve is affected by each adjustment.
Which version output amplifier is in your 465, discrete or IC? It seems you use the pre-B250000 manual because of what you said about the 10X magnifier. The B250000-up manual clearly mentions the 10X mag. That manual also shows both versions output amplifier.
