#124 started

[Lothy]

Greetings!

I just started my #124 build project.
It is in a very early stage, but all PITA jobs are done:

IMG_20191108_211050.jpg

IMG-20191108-WA0001.jpeg

IMG_20191109_102558.jpg

IMG_20191109_161626.jpg

Today I'll start to solder the boards.

Wish me good luck and no shorts!

Cheers
Gerhard

PS: Thanks to Taylor from Amplified Nation for this wonderful chassis. Saves me from lots of drilling and bumping....

[M Fowler]

Nice start, and using my favorite blue boards.

Mark

[Guy77]

That looks great Gerhard! The 124 high plate was also my first ODS amp, a great amp.
I recently did a 102 lowplate/skyline and it has now become my favourite.

I really like your red tip switches! Where did you buy those?

Cheers

Guy

[xtian]

I really like your red tip switches! Where did you buy those?

You can buy slip-on, colored plastic tips for your typical switches. E.g.,

http://smallbear-electronics.mybigcomme ... ored-caps/

[Lothy]

That looks great Gerhard! The 124 high plate was also my first ODS amp, a great amp.
I recently did a 102 lowplate/skyline and it has now become my favourite.

I really like your red tip switches! Where did you buy those?

Cheers

Guy

Hi Guy.
A vendor on Ebay.

https://www.ebay.de/itm/Kippschalter-Ki ... 2667237592

Cheers
Gerhard

[Lothy]

Greetings!

I will use this threat to share my experiences during the build with you. And to retrospect the things for me.

I have done the power board today.

And for sure, the first 22µF cap was in the wrong direction first!
But now it's correct.

IMG_20191110_180626.jpg

The downside - glad, you can't see this from above. No see-through boards for me

IMG_20191110_192638.jpg

Some jumpers will be completed tomorrow.

Next to follow: Rectifier/Bias Board...

Stay tuned.

Cheers
Gerhard

PS: If you find any issues, please give me a shout, thanks.

[Guy77]

Thanks for the links Xtian and Gerhard !

Guy

[erwin_ve]

You might reconsider the grounding of your capacitors; check the #124 layout.

[Lothy]

Greetings!

ok, no rectifire today. Finished the power board:

IMG_20191111_202424.jpg

IMG_20191111_202513.jpg

Erwin, are there any issues with the grounding?

I used a layout from Ceriatone (not sure). I don't want to post it here because of copyright issues. In the #124 Layout B+3 is grounded along with B+2 to ground No. 2. The question is, if the PI is on the preamp or the power amp side.

I'll take a note, and change this, if there are any ground loop issues when it comes to testing.

Thanks!

Cheers
Gerhard

[martin manning]

Looks alright to me.

[pompeiisneaks]

I would suggest that from my screenshot here, that your top solder joint may be dry, it seems 'cloudy' but maybe that's just the lighting

The lower one seems like you laid the wire against the bottom of the eyelet and filled the gap with solder. This isn't always the best solder connection.

It's way better to at least wrap it one time around the lead of the capacitor, or to have two jumpers both of which go inside the eyelet and make physical connection with the eyelet.

I've learned this the hard way when I made this kind of connection and it ended up having 'resistance' causing unexpected behavior. You should not expect solder to work like a perfect 'bridge' but more like 'glue' for joints.

grounds.png

Edit: spelling

~Phil

[sluckey]

My issue is not stringing the cap grounds together but rather the way you did it. You have a single wire spanning across four eyelets.That may work fine today, but down the road when you decide to change filter caps, that single wire may loose contact with one or more eyelets. A more reliable way to string those four eyelets together would be to use three short jumpers and push the ends through the eyelet, bend it over, then solder. That would make it nearly impossible for the jumper to accidentally come loose.

[norburybrook]

I thought the issue was one of those 4 filter caps should be grounded at the input and the others grounded down by the power tubes. The main filter caps grounded by the power transformer main B+ ground. so you have 3 separate grounds from the power board.



M

[martin manning]

You might reconsider the grounding of your capacitors; check the #124 layout.

Erwin, are you thinking about the PI cap going with the preamp caps? The eyelet board layout intentionally matches the grounding on the JBorders PCB. I would agree that the PI node filter ground might better be split out and grounded at the rear of the chassis along with the PI ground, but I know from personal experience that it produces a very quiet result as shown. That JBorders PCB is shown in the 183 layout.

Sluckey's point about hooking separate jumpers into each eyelet is well taken.

[norburybrook]

You might reconsider the grounding of your capacitors; check the #124 layout.

Erwin, are you thinking about the PI cap going with the preamp caps? The eyelet board layout intentionally matches the grounding on the JBorders PCB. I would agree that the PI node filter ground might better be split out and grounded at the rear of the chassis along with the PI ground, but I know from personal experience that it produces a very quiet result as shown. That JBorders PCB is shown in the 183 layout.

Sluckey's point about hooking separate jumpers into each eyelet is well taken.

the filter cap that supplies the FET board and V1 is grounded at the input, the other 3 are grounded together at the output tubes, called ground 2 on the layout.


M