Voltage Readings Following Soldering Error

[KatieandDad]

Ultimately measure between output and ground of each channel.

But 1.5mV is as close to zero as most designs get.

It seems that the two amps have survived the solder blob.

[AmCan]

Originally Posted by KatieandDad

Ultimately measure between output and ground of each channel.

But 1.5mV is as close to zero as most designs get.

It seems that the two amps have survived the solder blob.

Thanks again for your confirmation and explanation. I am going to fire it up tonight!

[Osvaldo de Banfield]

Originally Posted by AmCan

Hey Osvaldo,

Thanks for answering another one of my posts again!

OK, my friend, if I can help you, better. Beware I´ll go vacations this friday, so I´ll be away from computer during this following 2 weeks. Aleluya!!!

[AmCan]

Originally Posted by Osvaldo de Banfield

OK, my friend, if I can help you, better. Beware I´ll go vacations this friday, so I´ll be away from computer during this following 2 weeks. Aleluya!!!

Good for you! I refuse to check email on vacation too for my own sanity. I am going on vacation too from making any changes to my amp or preamp. I just finished upgrading all the caps in both and I need a mental breathier from the stress of worrying that I would mess them up (which I almost did) and waste all that money on designer parts. Now I am going to sit back, listen and enjoy. Then when I feel crazy enough and confident again I will tackle the resistors.

[KatieandDad]

If you want to be really safe. Buy yourself a pair of cheepie RCA interconnects and put a 1uF cap in series with the I/P.

For a couple of dollars you might protect against catastrophic damage.

[Osvaldo de Banfield]

Originally Posted by AmCan

Good for you! I refuse to check email on vacation too for my own sanity. I am going on vacation too from making any changes to my amp or preamp.

OK, no, I will use my free time to make some bricklaying in my own house and change the all day job.

[Osvaldo de Banfield]

Originally Posted by KatieandDad

If you want to be really safe. Buy yourself a pair of cheepie RCA interconnects and put a 1uF cap in series with the I/P.

For a couple of dollars you might protect against catastrophic damage.

Sorry, I couldn´t understand you... 1µF, where? , for what?

[AmCan]

Originally Posted by Osvaldo de Banfield

Sorry, I couldn´t understand you... 1µF, where? , for what?

Is this to control the stray DC Voltage I am getting across the Left and right terminals? The left and right channel did read zero Millivolts independently. My measurement across the terminals could have been in error. However, can I simply connect the 1uf between the sockets inside the chassis? Is that 1uf per channel? So the positive lead of the cap to the positive wire supplying the voltage to the Right RCA socket soldering tab, and the negative to the negative? Repeat for left channel RCA socket?

or what is the purpose exactly?

[bobrown14]

Citation 17? Check the resistors on the output to the amp selector at the very left back (port for the plug for amp/speakers). There are resistors tied to ground there, one may be burnt and I mean toasted to no longer making any connection as in fired up. No testing needed just verify they are not blown (apart).

If all is well and your voltages check to what they should be (your 2nd time around test indicated so) I would plug in and put on some music (try some test speakers first). Maybe your DIM is flakey, due to not fresh batteries giving you hokey measurement the first time around.

If it was me... I'd get a fresh set of batteries in DIM and give a 3rd test, results same and 2nd test, then hook it up and play (again test speakers) and turn it up and enjoy.

Cheers,
Bob

[AmCan]

I got my DMI from China for $10 shipped

I tested everything again tonight in the Citation 17 and it was all good. All Voltages normal, zero DC at the terminals and low and behold it played without a hitch. Still sounds great. I certainly can't explain what happened with he first set of readings but I am happy to have learned how to test the preamp. I think I am going to replace the resistors next to MF Thanks for your help guys!