Hello,
I was digging around my collection electronics projects, electronic parts and other such things. I came across a vacuum tube headphone amplifier kit, that I bought through DIY Audio. I forgot that I purchased it. I do not have the schematic, parts list or a PCB stuffing diagram.
I was digging around my collection electronics projects, electronic parts and other such things. I came across a vacuum tube headphone amplifier kit, that I bought through DIY Audio. I forgot that I purchased it. I do not have the schematic, parts list or a PCB stuffing diagram.
Sorry about that. As a matter of fact, I do have more information. I thought I saved the post a draft copy. I was planning on posting later with added photos.
Anyway.......
Here are details that I can share, right now.
01] This was a group buy kit for vacuum tube based headphone amplifier.
02] I bought the kit from a gentleman local to Silicon Valley.
03] We met up in a grocery store parking lot and I bought the kit.
04] IIRC it is a Cavalli design. The PCB has Cavalli name etched on it.
05] I recall the design used a series of voltage double circuits to get the B+ up to where it needs to be.
06] The design of the kit was well thought out. The encloser was a front, back, slide in top, U-shaped housing. Everything fit together very will.
07] The PCB slides into grooves on the inside part of the encloser.
08] You drill holes in the top to allow the tubes to stick up out of the box.
09] I am looking for what ever I can get. Schematic, BOM, stuffing guide, etc.
10] Are there DiyAudio link(s) associated with the kit.
11] I will add photos later.
12] I have a buddy that wants to put this together. Without documentation, we are stuck.
Thank you in advance for any help,
audiomot
Anyway.......
Here are details that I can share, right now.
01] This was a group buy kit for vacuum tube based headphone amplifier.
02] I bought the kit from a gentleman local to Silicon Valley.
03] We met up in a grocery store parking lot and I bought the kit.
04] IIRC it is a Cavalli design. The PCB has Cavalli name etched on it.
05] I recall the design used a series of voltage double circuits to get the B+ up to where it needs to be.
06] The design of the kit was well thought out. The encloser was a front, back, slide in top, U-shaped housing. Everything fit together very will.
07] The PCB slides into grooves on the inside part of the encloser.
08] You drill holes in the top to allow the tubes to stick up out of the box.
09] I am looking for what ever I can get. Schematic, BOM, stuffing guide, etc.
10] Are there DiyAudio link(s) associated with the kit.
11] I will add photos later.
12] I have a buddy that wants to put this together. Without documentation, we are stuck.
Thank you in advance for any help,
audiomot
I can probably help if you can post a pic of the board. TBH it sounds like one of Alex's hybrid amps, in which case any doc's are long gone.
This maybe? Only one tube though. http://www.diyaudioblog.com/2014/03/cavalli-cth-compact-tube-hybrid.html
This maybe? Only one tube though. http://www.diyaudioblog.com/2014/03/cavalli-cth-compact-tube-hybrid.html
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It pears that you are correct, the two PCB are close, but not a match. I got two tubes on my board.
I thank you for taking he time to taking a shot at helping me out.
I thank you for taking he time to taking a shot at helping me out.
I was able to dig up some more details.
I bought this kit (Dec 2008) from Jeff Rossel via the glassjaraudio.com. glassjaraudio.com takes you to a foreign language slots playing site. Does anybody know if Jeff Rosell is active on any other forums?
Unless I can get lucky and make and active, living contact to Jeff Rossel, I am pretty much dead in the water. With a bag of parts, a decent project encloser and a quest for a replacement design.
I bought this kit (Dec 2008) from Jeff Rossel via the glassjaraudio.com. glassjaraudio.com takes you to a foreign language slots playing site. Does anybody know if Jeff Rosell is active on any other forums?
Unless I can get lucky and make and active, living contact to Jeff Rossel, I am pretty much dead in the water. With a bag of parts, a decent project encloser and a quest for a replacement design.
Sometimes you get lucky. I searched email history. We had some back and forth about meeting up and getting the kit. Among the emails there is a Xcel spreadsheet was attached. It was a complete BOM, with device mnemonics, component description and even the Mouser house part number.
Now my buddy has a real project on his hands.
Now my buddy has a real project on his hands.
@audiomot I used the "Wayback Machine" from the Internet Archive and found some info on the amp that you might find useful:
PARTS LIST:
https://web.archive.org/web/20130821080622/http://www.cavalliaudio.com/diy/soha ii/main.php?page=parts/ampparts
INSTRUCTIONS (not very useful, however!):
https://web.archive.org/web/20130826103648/http://www.cavalliaudio.com/diy/soha ii/main.php?page=instructions/assembly
And so on. There is more info that you can access from this page:
https://web.archive.org/web/20130824070828/http://www.cavalliaudio.com/diy/soha ii/main.php?page=overview
Use the menu on the left side of the page. This is an archived copy of the web site, but the content is not 100% there.
PARTS LIST:
https://web.archive.org/web/20130821080622/http://www.cavalliaudio.com/diy/soha ii/main.php?page=parts/ampparts
INSTRUCTIONS (not very useful, however!):
https://web.archive.org/web/20130826103648/http://www.cavalliaudio.com/diy/soha ii/main.php?page=instructions/assembly
And so on. There is more info that you can access from this page:
https://web.archive.org/web/20130824070828/http://www.cavalliaudio.com/diy/soha ii/main.php?page=overview
Use the menu on the left side of the page. This is an archived copy of the web site, but the content is not 100% there.
I missed the CTH a lot, great little amp with big sound. Wish Cavalli published his DIY boards now that he retired.
Great news. DIY always sounds better because you built it yourself. Now your friend will have the newest SOHA II on the planet. 😎