AC coupling floats the displayed signal so that it is zero on average, regardless of what the lows and highs of the incoming signal are. Look at the absolute voltage levels in DC mode; L should be very near to 0V / gnd (first adjust your scope's vertical scale to show 0 with no signal applied).

Still... what did you mean with "+3.5V offset"?

That's odd - would be nice to know what the actual impedance of the processor input is. If I remember right, you've never seen a proper tuner freq display so far? This problem might have been there all along then, even before you started the work. The LS74 datasheet says that a H level output should be able to supply 0.4 mA while keeping the

[quote user="sonavor"]It is a 74LS74AN and the datasheet says the its output high voltage level is typically 3.4v witha minumum of 2.7v. What I am seeing is 1.28v. If that isn't sufficient for the processor to read then it could explain why the display stays at the default 74.8 instead of the actual frequency.[/quote] Yes, if nothing is

Although, after replacement, you need a signal generator and an oscilloscope / AC voltmeter to calibrate the driver levels. But if the speakers are for your own use and you don't care about the frequency response possibly being some dB off, well.. you don't care and just forget about it. There's also the possibility of the speakers having

Torn woofers is my bet.

[quote user="nmartin771"]Andreas, I will take the old ones [/quote] They are now destroyed and obviously not worth it to ship over there. Andreas, if Eva doesn't let you keep two pairs, I could spare you the trouble of taking them to the skip

Sorry if I'm late to say this, but FM frontends (and IF alignment) should be left well alone unless you know there's something wrong in there Concentrate on the simple things. Have you checked that the U264B has a good, stable power supply? Also, don't inject the test signal directly on pins 2&3. Unless your signal generator has a balanced

[quote user="elephant"] And Papanek mentions the Palaset storage system in his book; pre-IKEA :) but look at this ... http://daddytypes.com/2007/04/08/awesome_set_of_vintage_palaset_storage_cubes.php [/quote] ...and regardless of the title of the original fleaBay auction, they are FINNISH and not Danish! Just last summer I sat in a restaurant

[quote user="Leslie"]Yes Soren I could do that. You're invited and please, take your handbag with you [/quote] The "fret" on those Pioneers reminds me a bit of the quad-era Sansui speakers. Same '70s, I guess...