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A Very Compact Hybrid Amp - Page 27

post #391 of 2201
3/10/09 at 12:58pm
Quote:
Originally Posted by runeight View Post
You know, I shouldn't even mention this, but it would not be hard to make a speaker amp version of this amp. It would be quite a bit bigger and a 1A wall wart would be absolute minimum. There would be more heat burned inside the box and a serious regulator heatsink would be necessary.

But the rest could be done without much difficulty on a bigger board.
Yes, please. I'm a fan of moar power so that I can drive my orthos and maybe even my Stax through the transformer boxes properly.
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post #392 of 2201
3/10/09 at 1:16pm
Quote:
Originally Posted by cfcubed View Post
And I wonder if their 8416s, 12au7s, etc are notably different sounding.
I have the Amperex PQ 8416 and the Amperex "orange globe" 6189. They are very different sounding.

I am very much enjoying the Du Mont 5814a (RCA rebrand) with my DT150.
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post #393 of 2201
3/10/09 at 1:23pm
Quote:
Originally Posted by runeight View Post
You know, I shouldn't even mention this, but it would not be hard to make a speaker amp version of this amp. It would be quite a bit bigger and a 1A wall wart would be absolute minimum. There would be more heat burned inside the box and a serious regulator heatsink would be necessary.

But the rest could be done without much difficulty on a bigger board.
Then I would request a low-mu octal version as well.

To be honest, any design can be made more powerful, but I think it goes against the transportable design goal. If going speaker amp, I would think the SOHA 2 would be a better fit to make bigger as it's already bigger in terms of transistors and regulation as the CTH or a hybrid of the two on the input stage.
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post #394 of 2201
3/10/09 at 5:57pm
Thread Starter 
The very small footprint of this amp will be lost in a power amp. That's just the way it is.

But, I've got too many things going right now to do this design. There is a stat amp in the works and boards getting ready to fab and the CTH kits to be offered for the next round.
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post #395 of 2201
3/10/09 at 10:28pm
That's true. I'll definitely try to give your electrostatic amp a go once the kinks have been ironed out since it seems almost all of my headphones are now electrostats, with very few orthos and a K340 that still needs a recable. I'm glad you designed this particular hybrid with size/transportability in mind first, of course, and I still may build one at some point. I bought 20 12AU7 variants and I don't feel like they should just be sitting around doing nothing.
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post #396 of 2201
3/11/09 at 12:35am
Thread Starter 
With all those 12au7s it would seem like you have to build one of these.
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post #397 of 2201
3/11/09 at 12:36am
That is why I want to build one.
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post #398 of 2201
3/12/09 at 6:19am
Oh dear..I screwed up my top plate..first time I was drilling such a big hole in aluminium and I messed it up pretty bad. I was using a hole saw and it all went awry.
I used a wood boring bit to make the center hole after the mess with the hole saw.

This is what happened.



If anyone has a spare tube ring (from the tube ring protectors) please PM me. I could definitely use it to cover up my stupid mistake. Never mind already placed order for a set on ebay


I tried driling the main hole with a hole saw and failed completely. Instead I plan to drill ou tthe hole using some other drill bit and put a tube ring around it to cover up the mess.

The CTH stands for the amp and of course CA stands for Cavalli Audio. Ghetto I know..but the best I could do with a hand drill.
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post #399 of 2201
3/12/09 at 9:05am
Quote:
Originally Posted by sachu View Post
If anyone has a spare tube ring (from the tube ring protectors) like in this picture please PM me.
I posted a good amount of info where you posted this elsewhere.

BTW Consider swapping out the pic in your post of my CTH lid since that top-mount heatsink test proved it was unnecessary & I'll be using a std internal one for the LV reg. CTHs do not need tacky spoilers
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post #400 of 2201
3/12/09 at 9:11am
Quote:
Originally Posted by sachu View Post
Oh dear..I screwed up my top plate..first time I was drilling such a big hole in aluminium and I messed it up pretty bad. I was using a hole saw and it all went awry.
Ouch, Feel your pain, done that before. Won't use a holesaw anymore, do my tube holes with a hand file.

If you don't have any luck with getting a tube ring I used one of these bushings from Mouser(561-MP15018). Might be easier for you to get, OD is approx 1.6", may be enough to cover it up. Also gives about 3/16" clearance around tube to help with cooling.

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post #401 of 2201
3/12/09 at 9:45am
Quote:
Originally Posted by Forte View Post
Ouch, Feel your pain, done that before. Won't use a holesaw anymore, do my tube holes with a hand file.

If you don't have any luck with getting a tube ring I used one of these bushings from Mouser(561-MP15018). Might be easier for you to get, OD is approx 1.6", may be enough to cover it up. Also gives about 3/16" clearance around tube to help with cooling.
Thanks for that...that's going to be bookmarked now.cheap and looks very good too..pity I already ordered the rings from ebay. Oh well another time..

Took more measurements..looks like if I manage to not screw up further with the center hole, the tube ring should just about cover the mess up..Also deburring the holes around CTH and CA madea difference to the look..It looks better in person than in the photo
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post #402 of 2201
3/15/09 at 12:19am
Is this amp available in any form right now?

How is the performance on Grados?

What do you guys think the skill level is? I have never built electronic components, but I know how to solder and I build other things.
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post #403 of 2201
3/15/09 at 2:36am
Quote:
Originally Posted by Netdewt View Post
How is the performance on Grados?

What do you guys think the skill level is? I have never built electronic components, but I know how to solder and I build other things.

Performance with Grados is excellent - I have been using my CTH proto with Grados at work for a while. It' s been my experience that Grados love hybrids, and this amp drives them quite well.

Skill level is intermediate I'd say. All the soldering is straight forward, but there are a great many parts very close together. If you've not soldered board-level components, it would be good to practice both soldering and desoldering before tackling this amp.
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post #404 of 2201
3/15/09 at 4:20am
Got to hear the CTH at the PDX meet today

Quote:
Originally Posted by dBel84 View Post
Compact Hybrid - much bigger than its diminutive size would suggest. I didn't have much time with them as in many meet conditions but the overall quick impression was very favourable - strong bass, good transient response, sparkly highs .... what more could a fella want.

Excellent amp ..dB
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post #405 of 2201
3/15/09 at 4:26am
Quote:
Originally Posted by dBel84 View Post
Got to hear the CTH at the PDX meet today
Excellent amp ..dB


Thanks for the pic dB...I was listening to it with the not properly modded headphones all this while. the SFIs and the HP2 sound great with it. Did you happen to take more pics of the CTH?
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