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A Very Compact Hybrid Amp - Page 25

post #361 of 2201
3/6/09 at 12:32am
^ You might like to wait for a kit. Several of us Aussies seem to be interested in building one as well.
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post #362 of 2201
3/6/09 at 2:30am
Sachu, I called us the second round, since Cfcubed and Forsakenrider actually had them in their hands first and built up the first pair of boards before Runeight sent them out to us. Or we're phase 2 of round 1..
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post #363 of 2201
3/6/09 at 2:31am
I agree we should wait for the final design to come out first, before ordering any parts.
Since it may have few changes. (as eager to build it as I do now, I still rather wait )
As I recalled, mentioned in a couple pages earlier,
there's a little hick in buffer servo mechanism which runeight already solved the problem.
That may yield a little change, I believe.

For the proto team, anyone have access to some test equipments.
Can you do some measurements? may be we can fine tune a little bit
for the final design.

For example, perhaps consolidation of those 2.X k resistor to one or two values, so
there will be no need to order many unused parts. (I tend to order resister in a pack of
multiple ten )

Cheers,
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post #364 of 2201
3/6/09 at 2:36am
DracoV, I have to say, that is the beauty of ordering from Mouser.. They will sell you a single resistor of a certain value. Notwithstanding their BOM tool.. No more tedious entry of 170 odd parts.. Now, if they would ship as fast and a cheaply as Digikey.. then I'd be Happy.. (Digikey will ship to Canada overnight for $8.. Mouser charges $20 for 1-2 day service..) I've ordered as late as 5 pm from Digikey and it shows up at my office by 10ish the next day..
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post #365 of 2201
3/6/09 at 4:44am
This is great that almost all the amps are now functional...a few hiccups along the way but everything seems to be working out... haven't been able to finish up the case just yet...by saturday for sure..back to listening to the 12BH7A now..
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post #366 of 2201
3/6/09 at 10:02am
Quote:
Originally Posted by nux View Post
Is the BOM looking like it can all be sourced from Mouser?
There are still two parts from Digi-Key AFAIK...

My amp has been running for just about a month now with no issues. It was one of the second round of 'proto' builds - if you don't count the Proof of Concept - an incredible build by CFCubed.
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post #367 of 2201
3/6/09 at 12:08pm
Quote:
Originally Posted by nux View Post
Is the BOM looking like it can all be sourced from Mouser?
< snip >
Anyway the design looks great, very well thought out. Looking forward to building one.
Check out this post for alternative Aussie source for the 2 Digikey parts. Think some sort of PCB/parts assistance should happen by month-end. Perhaps a mini bundle w/PCB, LM2595 & 220uH coil? Think we'll know pretty soon.

Thanks from runeight & I for the kudos WRT the amp, etc. It is certainly looking like a successful prototype process & things are quite solid now.
My opinion is that this is an intermediate level project... Nothing to bias, match & no options (other than clear or black alum) but even experienced builders can make one or two mistakes across the 160 or so parts. As sachu says it looks like even those few builders will have working amps very soon (one remaining? thanks to runeight for that).

There is a lot of info on the draft CTH website & there will be even more to assist others & help them further to put the rights parts in the right places (& w/correct polarity). That's all it takes. And all feedback indicates it's well worth the effort
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post #368 of 2201
3/6/09 at 1:24pm
Awesome and sounds like a perfect project next... I've not done a pcb and have always wanted to. I was looking to build a SOHA II but after seeing all the tweaks, biasing methods, and all the tech jargons being thrown around I thought it was way over my head -- seeing this CHT coming to life sounds like the ideal starting point.
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post #369 of 2201
3/6/09 at 5:18pm
As we all have discovered, if one is diligent in reading the provided information , and being careful about part placement, the CTH can come together pretty nicely. And with the dual heater voltage, and servo adjustment for the plate voltages, tube rolling is going to be a dream..
I've already ordered my third tube, just from some of the other guys recommendations.

And one very positive thing, the tubes are very very available, unlike the SS tubes, which are getting hard to find and more expensive all the time. I was going to build one for a friend, but had to re-consider once I found out how much it was really going to cost.. He's not THAT good a friend..
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post #370 of 2201
3/6/09 at 6:06pm
Quote:
Originally Posted by sachu View Post
can't wait to show it off at the upcoming meet here in Portland..
This will be a new experience for me = hearing a Cavalli build not built by myself I look forward to it..dB
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post #371 of 2201
3/7/09 at 1:16am
I want to show mine off!! I need to meet some headfiers around here, or make some out of my buds!
I have tooooo many tubes to roll through this, I dont know what Im going to do....
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post #372 of 2201
3/7/09 at 4:37am
Quote:
Originally Posted by forsakenrider View Post
I want to show mine off!! I need to meet some headfiers around here, or make some out of my buds!
I have tooooo many tubes to roll through this, I dont know what Im going to do....
Smoke another one and come up with another super duper intellectually stimulating and funny post that eludes everyone not in the know.
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post #373 of 2201
3/7/09 at 10:24am
Quote:
Originally Posted by olblueyez View Post
Smoke another one and come up with another super duper intellectually stimulating and funny post that eludes everyone not in the know.
Heh. I don't get that post at all. My only guess is that it could be frustrating that after hearing the good stuff about this amp access to PCBs/kits is not available at the moment? Edit - Ha. Just read your sig... Maybe you are just being sarcastic & that was a joke? Hope so

Please be aware runeight & I are working hard to make PCBs and/or kits available as soon after the proto stage is vetted as possible. Think we've shared everything here that makes sense until the proto PCB round is over (any day now?). Wouldn't want people, other than the proto "guinea pigs", to suffer through any bumps in the road to a fine working amp. Only through responsible diligence (e.g. fine design work, sims, protos) can solid, hassle-free designs come about.

Being a "Headphoneus Supremus" I'm sure you've perused various forums (& threads in this very forum) enough to see the growing pains in other protos & even "production" projects that can be avoided through the above (e.g. not rushing things out).

Edit: Realize too it may be hard for prototypers of this amp (that have not heard amps of this caliber) to contain their excitement & satisfaction with it. I'm guilty of doing that here (sorry, but its nice when something works out as hoped). Again PCBs and/or kits will be (responsibly) available soon.
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post #374 of 2201
3/7/09 at 11:49am
Thread Starter 
Quote:
Originally Posted by forsakenrider View Post
I want to show mine off!! I need to meet some headfiers around here, or make some out of my buds!
I have tooooo many tubes to roll through this, I dont know what Im going to do....
Not to speak for forsakenrider, but I thought he was referring to the fact that other CTH prototypers are taking their amps to meets in the near future and that he would like to have an opportunity to do that too.
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post #375 of 2201
3/7/09 at 2:17pm
Well done runeight, at least one person gets me 'round here.

Right now ive got a sovtek 6922 in there, never heard one of these variants before.... so far so good, needs more time though. Its not jumping out anywhere specific though..
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