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A Very Compact Hybrid Amp - Page 99

post #1471 of 2213
Australia is pretty close to Seattle isn't it?

hehe
post #1472 of 2213
Thread Starter 
Why yes it is. It's right off the coast of Baja CA. It's a wonder that the marsupials haven't found their way to San Diego yet.
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 #1473 of 2213
Alex, popped in the 6n6p after the cap upgrade and am loving it. Very nice indeed with plenty of oomph!
post #1474 of 2213
Spot the CTH:

CanJam 2009

At the verrrrry bottom... RDS' build
post #1475 of 2213
Quote:
Originally Posted by wiatrob View Post
At the verrrrry bottom...
Hey, you gotta start somewhere
post #1476 of 2213
rds, any feedback on the CTH from the show?
post #1477 of 2213
an excerpt from one of the attendees at Canjam.

"The Audeze planars were surprising. They sounded pretty good from the short listening session I had. The clarity was almost as good as the Omega II possibly. Its soundstage was very wide, but its imaging wasn't in the same class as the O2s. Of course, the Blue Hawaii and O2 combo costs like $8000 while the CTH(at least I think it was a CTH) and Audeze planar combo costs less than a 1/10 of the price; so, relatively speaking the little amp and headphones held up pretty well. I'd love to take a crack at them again in my room with my set up to see how they compare to my Lambdas since they're one of the few set ups things I listened to that I can reasonable afford at this point - as much as I loved the O2/BHSE as a poor college student I'm not getting that rig any time in the near future unless I win about 10k in Vegas or something."

here is a pic of the ortho table and my CTH...this was on the first day before I decided to plonk it on the Audeze table. They were using some obscure amp to drive the headphones.

post #1478 of 2213
Quote:
Originally Posted by wiatrob View Post
rds, any feedback on the CTH from the show?
Hopefully Craig (of Whiplash Audio) can fill us in on that. I know he was very impressed with it.
post #1479 of 2213
Quote:
Originally Posted by rds View Post
Hopefully Craig (of Whiplash Audio) can fill us in on that. I know he was very impressed with it.
Craig told me that his CTH (built by rds) didn't get that much attention as there were a plethora of amps to choose from on his table. Those who did listen to it liked it is what he said.

However across the room is where the CTH saw a lot more action.. With Locus Design i think (?) Since they only had one or two to choose from.
post #1480 of 2213
Yep at first the CTH did not get as much action based on so many amps to choose from. I often pointed to Locus Design which was sharing a room. Plus we had so many people in our area that it was often difficult to get to everyone.

I did end up moving the amp for a bit. When I did that, more listeners were able to enjoy this amp. Then our ceiling came crashing down because of water. After that, the CTH was moved to where it was originally.

I must say I'm very impressed with it. Some actually said it was as good as the Mini Millet Max!! Also being very compact and such, its a great looking and sounding amp!!!

Great job Ryan and Alex...
post #1481 of 2213
Hi all together!

I finally finished my board, but am stuck with a little problem.
The E12 won't switch to green (no sound).
Pin 1 and 6 of the tube socket are around 104V and 80V without/with tube installed.
Pin 4 has got 12V.
I swapped the TL081s around with no change (all three seem to have the same voltages on their legs).
With a diode test I got the bicolor LED to show me a little green light, red light is working.
The DC offset is under 10mV for both channels.
Checked all solder connections.
But still no sound.

Could someone please help. My Grado wants tube...

Thank you for any help

Greetz Ava
post #1482 of 2213
Quote:
Originally Posted by Ynis Avalach View Post
The E12 won't switch to green (no sound).
<snip of good V measurements>
With a diode test I got the bicolor LED to show me a little green light, red light is working.
The DC offset is under 10mV for both channels.
Checked all solder connections.
But still no sound.
This seems like a case where things may be fine but some issue in your e12 section is preventing it from kicking on the relay (& LED).

Are your DC offset measurements at the "input" pins of the relay?

You can see here that the "middle" pins of the set of 3 pairs of the relay are the source/input pins.
When I had to diag some things I just ran wire from those middle pins (R, L, OG) for measurements & testing.

If your true offset measurements at input to relay are ok (< 75 mv per channel or so), then I'd review these parts on your build.
post #1483 of 2213
Quote:
Originally Posted by SACD-Man View Post
I must say I'm very impressed with it. Some actually said it was as good as the Mini Millet Max!!
And heres another opinion on the design, but all amps have their character & all listeners their preferences.

Heck I was going to put an old SOHA up for sale & while listening to make sure it was fine decided to keep it
post #1484 of 2213
Bingo, the right channel's got 23V and the left exactly 12V dc offset.
Ahhhhhh...Any thoughts?
Ava
post #1485 of 2213
Quote:
Originally Posted by Ynis Avalach View Post
Bingo, the right channel's got 23V and the left exactly 12V dc offset.
That's a lot of volts. Others are better at helping diagnose portions of CTH other than heater circuit...

Know you've posted measurements but maybe crawl through the setup procedure & measurements. Perhaps carefully crawl through the PCB parts images and such...
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