Amp Camp Amp Kit 1.6/1.8

[motosapien]

Yes 6sX6, but it seems a fine line.

 

[6sX7]

It is. Which is why there are philosophers asking why is there air.

 

[6L6]

@motosapien

When you said you have no sound, were you testing one or both channels at a time?





Have you done the voltage checks on image 2 and 3 of ACA 1.6 build guide step 56?

 

[motosapien]

I tried both channels. On one I could get some faint static touching the speaker leads to binding posts. Did not think to note which channel this was. I am away from home now and will do the voltage and resistance testing Monday and post the results.

 

[6L6]

Did you try both channels simultaneously or each channel singly, in turn?

 

[motosapien]

Singly, in turn

 

[6L6]

Try both at the same time

 

[motosapien]

Will do

 

[motosapien]

Here are the resistance checks spec'd in step 56 of the V1.6 build guide. Going to wait until these are digested before I move on to power on voltage checks.

 

[motosapien]

Some of the readings were hard to get ( had to move the probe around a bit ).

 

[6L6]

Looking good!

Power-on checks are also important, looking forward to seeing your results.

I’m still curious about trying both channels at the same time.

 

[motosapien]

Power checks came out nicely.

 

[6L6]

Fantastic!

With all the testing complete, at this point it’s logical to hook it all up and see if it plays.

 

[motosapien]

I will hook it up to my pre ( both channels and speakers ) next. I did check the Bias again and found a bad joint on a Q1 D. ( fixed )

 

[motosapien]

Well my pre is a brand new Emotiva PT2 so it may take a little bit. If it goes like we hope I will spin up an original Riverside record of Waltz for Debbie that I know well.

 

[motosapien]

Still not getting any sound. Perhaps it is my the new Emotiva pre. The only other thing is the resistance check on r 10. Using the 2M setting on my multi meter I got 0.32 on both when it says I should be getting 335k. The image shows this reading taken at the bottom of R10 and not at Q4 D?

https://d3t0tbmlie281e.cloudfront.net/igi/diyaudio/2FQWIEvDoExCO1FQ.large

 

[6L6]

0.32 on a megaohms scale is 320K. Close enough.

hmmm… this is weird, everything is measuring correctly.

You’ve got the Right RCA connected to the left PCB and vice-versa. Correct that when you get a chance.

 

[motosapien]

Well gee whiz, not sure how I missed that? Will do. So the gate of Q4 is really measured at the bottom of r10? Can I run the ACA on a line out from my existing receiver?

 

[6L6]

Yes, Jfet gate is at “bottom” of R10. It’s a two-sided PCB.

Yes, you can.

 

[motosapien]

6L6, Thank you so much for your time and expertise. It is quite generous in these times and greatly appreciated! Now I find myself wanting to continue in magic smoke diy