Pictures of your diy Pass amplifier

[peppennino]

Simply SPECTACULAR, Eric!

 

[mkane77g]

Agreed! Love the wooden chassis - walnut? I used some walnut burl on my Aleph-J. Images are in my signature link.

Eric

Black Walnut from a tree harvested at home. The enclosure was originally intended for a different project

 

[Eric]

Now that's a home-grown project! Nice work!

 

[mkane77g]

thanks. PITA to check bias/offset though.

 

[Eric]

I've also discovered this downside to "unconventional" chassis construction. I keep trying to figure out a way to build a wooden chassis without a ton of visible screws and still manage to perform some form of maintenance. I'm not there yet...

 

[Indigent Audio]

I love the walnut and remote supply...6l6 I think a remote PS build guide (both ps and amp sides) using the uPS board would be very helpful.

 

[Eric]

Here is my modular power supply. I didn't build it into a case, so everything is plain to see.

From left to right is the AC power entry and a 5A fuse, a CL-60 thermistor on the transformer primary, a second CL-60 for ground isloation, a 750VA 18+18 transformer, discrete rectification with snubbers and heat sinks (must ground sinks as diodes induce voltage), followed by Tea-Bag PSU CRC board with 4 x 27,000uF 50v caps per rail, separated by 3 x 0R22 3w wire wound resistors, then a three-conductor Neutric connector. The umbilical cord is 3x13ga wire.

 

[Indigent Audio]

For caps you have 4x27k (108k) per rail on the ps and 2x56k (112k) per rail on the amp side? Roughly mirrored on purpose? I am sure you want the umbilical as short as possible but does having that much capacitance on the amp side allow the umbilical to be longer? Thanks

 

[Eric]

Specific values of caps is nothing more than me using what I had on hand at the time. I wanted CRC in the modular power supply, figured the umbilical will add some (small) amount of resistance, and wanted to make sure there was also local capacitance in the amp itself.

The CRC resistance is about 0R07 or so. The umbilical is 5-6ft long, plus the Neutric connectors on each end. This probably adds more than 0R07 in resistance, so the real configuration is probably something more like a CRCRC when everything is connected together. The amp is super quiet and behaves well.

 

[ClaudeG]

But isn't the umbilical adding a wire resistance also on the ground rail... whereas in a CRC filter you would want R only on the +V and -V rails?

Just thinking out loud...

Claude

 

[Eric]

Any additional wire resistance wasn't really part of the formal plan. If it's there, it's fine. If it's missing, I don't think I can tell, so I don't care. Just wanted a CRC modular supply... PSU Ripple at the final set of caps is VERY small.

 

[JR_W]

Black Walnut from a tree harvested at home. The enclosure was originally intended for a different project

Nice wood, beautiful. Ice storm has provided me with some larger than I would like pecan timber, but walnut is so much nicer to look at (I'll use the pecan for cooking).

 

[6L6]

If you put a pair of capacitors in the amplifier chassis the umbilical would become a filter resistance and the PSU would effectively become CRCRC.

 

[Mrdrewk]

SVG vector art for lettering

Anyone have any vector art files that they really liked, and would be willing to share? I'm going to have some embossing done to the faceplate of this F5T, and why reinvent the wheel? thanks!

 

[Andersonix]

https://www.diyaudio.com/forums/pass-labs/366973-creative-help-logo-please.html#post6508778

like that?

 

[Mrdrewk]

@Andersonix
Perfect! Got the font. that'll make it look way more legit. Thanks again.

 

[esprit]

Power supply for BA3 Fe and Pearl 2.

 

[cubicincher]

to esprit

Nice PSU!



Greets Dirk

 

[Eric]

Wow - very neat work! Mine still tend to look like rat's nests...

 

[6L6]

Nicely done!!