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A Very Compact Hybrid Amp - Page 29

post #421 of 2213
Quote:
Originally Posted by sachu View Post
I understnad a few of you chaps have used the vitaminq and the russian 0.22uF caps ..how big ar they..will they fit in the larger of the target cases?
I used VitQ's on my build, but it was with the caps on the underside of the board. I'm not sure there is room if you use the standard configuration.
LL
post #422 of 2213
Thread Starter 
Quote:
Originally Posted by nux View Post
Can anyone confirm whether 12AT7 tubes will work with this? I have been buying up some 12au7, 12bh7a and 12at7 tubes in preparation for building this amp!

Tubes like 12at7 and 12ax7 will probably not work. Their operating points are just outside of what the tube servo can do. This is because neither of them is happy at 80V. However, as several have noted, their gain is too high anyway and your volume pot would become useless.

Try some 6N1Ps. They'll be more fun.

Gents, one reason for the choice of 12au7 as the design center tube is because, if all else fails, there are several sources of current production 12au7s. Thus, you won't have the problem of NOS stock getting depleted making the amp into a paperweight.

Additionally, 6N1Ps, 6922s, and 12BH7s are also in current production. Just remember me when you're rolling tubes.
Dr. Cavalli gained notoriety with his first DIY amplifier projects. His success has blossomed into Cavalli Audio, a world leader in amplifier design.
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post #423 of 2213
Quote:
Originally Posted by runeight View Post
Just remember me when you're rolling tubes.
No worries there. Rolling tubes is becoming my new addiction.
post #424 of 2213
Quote:
Originally Posted by cfcubed View Post

Edit: WRT keyid's coupling cap experiences - Think preference hits here & everyone was/is happy w/BoM caps, but being tweakers its hard to resist tampering, uh, "improving". A couple of us are using non-Bom couplers (Sonicap Gen II, etc.) to good effect, so keyid's experiences may not be others (& vice versa).
yes it was an opinion
post #425 of 2213
Thread Starter 

Kits are Available!!!!

OK folks, the moment you've been waiting for.

Boards and kits for the CTH are now available from:

Spruce Canyon Labs

Bill Wiatroski (wiatrob) has agreed to supply the Rev 1 Boards and Kits. Please contact Bill through his website. And you will see lots of options to choose from.

Also, please take advantage of the Cavalli Audio website for design and build information. The CTH section includes lots of important information gathered from the prototype process. If you pay attention to what is here you're amp will probably come up the first time you turn it on.

Cavalli Audio CTH

And if you guys think I should create another announcement thread I'll do that too.

wiatrob will probably follow this post with additional information.

Thanks for everyone's interest.
Dr. Cavalli gained notoriety with his first DIY amplifier projects. His success has blossomed into Cavalli Audio, a world leader in amplifier design.
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post #426 of 2213
Right-on!
post #427 of 2213
Alright!! I think this warrants an announcement thread...
post #428 of 2213
First off - thanks to Alex and Chris for a great design. Mine has replaced my hulking M^3 as my work amp. Also the proto team for testing the waters.

Rev 1 boards have been ordered. I am awaiting confirmation from the fabricating facility on an exact delivery time, but it should be within two weeks.

Initial parts orders are on the way - I should have kit and option pictures up by the weekend. If you have general amp and technical questions, this is the place for 'em. If you have questions about the kit, please follow the link in my sig.
post #429 of 2213
Thread Starter 
Announcement made here:

CTH Announcement Thread

Prototypers, tell them how your amps are doing.
Dr. Cavalli gained notoriety with his first DIY amplifier projects. His success has blossomed into Cavalli Audio, a world leader in amplifier design.
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post #430 of 2213
Quote:
Originally Posted by runeight View Post
Announcement made here:

Prototypers, tell them how your amps are doing.

Indeed! As soon as I get a release amp built I am going to send it out on loan to the usual suspects.
post #431 of 2213
Quote:
Originally Posted by wiatrob View Post
Indeed! As soon as I get a release amp built I am going to send it out on loan to the usual suspects.
I suspect I might be a suspect?
post #432 of 2213
Hurray! Kits!

Just have a bit of confusion reading the website though. So if I opt for the complete kit with a black case, does it already come with the pre-drilled top or do I need to pay the extra $6 for that??

I wonder if I should order the 12BH7A whilst I'm at it......fingers crossed shipping doesn't become ridiculously expensive.

Damn, so much stuff I want to buy at the moment
post #433 of 2213
The 12BH7A is a fantastic tube on this amp..I actually have a Gold Aero doing duty right now

I think Wiatrob offers a 12BH7A with the kits
post #434 of 2213
Yes he does, and I'm wondering if should go for it at $12USD....

Argh. I want to buy an Audio GD compass, but also desperately want a tube amp (specifically, this one to build).......
post #435 of 2213
man..this amp rocks so much that I can't wait to get my hands on the second board...looks like 4 are already spoken for..I am hoping I was included in that count..
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