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A Very Compact Hybrid Amp - Page 144

post #2146 of 2213

I just double checked my original BOM with the recent one and HA! almost every R in the e12 was changed. I changed them all and its now able to go to ear bleeding volumes without e12 tripping. I find the cooler my amp runs the easier it is to trip the e12. I guess because some of the transistors are effected by temp. When I swapped the BC337 I added thermal paste to the 24v reg (oops) and that made a noticeable difference in temperature.

 

So, lets re-design it for pocket sized fun :)

post #2147 of 2213

LOL, now that you mention it, i think I remember the resistor changes!

post #2148 of 2213
Quote:
Originally Posted by forsakenrider View Post
HA! almost every R in the e12 was changed. I changed them all and its now able to go to ear bleeding volumes without e12 tripping.

 

So, lets re-design it for pocket sized fun :)

Sounds like all is well w/your CTH now.

 

Re: re-design - Y'all may have noticed things are a bit quieter around here.  My guess is it may be a combo of there being plenty of designs to choose from & maybe efforts happening in the dark / elsewhere, which IMO is fine.  Personally, I've enough gear for 3 or 4 audiophiles:)

But I'll probably not be able to resist the smell of solder for long.  E.g. it dawned on me I've never made an exceedingly simple headamp (other than may my 1st - the SOHA), like one w/a dozen or so parts per channel total.

So kicking around the idea of trying something involving an actively loaded grounded cathode input stage (from a schematic Alex passed to me way back), an IRF510, this SMPS:

http://www.tayloredge.com/storefront/SmartNixie/DataSheets/Datasheet_1363-1364.pdf

some other bits & a 12VDC wallwart and see what happens (perhaps not much:)  Someday anyway.

^^^^  Yeah, don't both w/that nixie SMPS for audio.  It's switching freq seems to be in the high end of audio range.  Something different might work tho.


Edited by cfcubed - 1/14/11 at 4:00pm
post #2149 of 2213
Quote:

Originally Posted by cfcubed View Post

 

Personally, I've enough gear for 3 or 4 audiophiles:)

 

LOL!

 

I don't even consider myself an audiophile, to be honest.  I hear you though.  I never sell anything, so I have amps galore, along with half-finished amps and amps that never made it past paper (tried to design something, but kind of lost interest in everything half-way through).

post #2150 of 2213
Thread Starter 

Gents, the original CTH boards have been bought up slowly over time. There are only 2 left in my inventory and I don't expect to make any more any time soon.

 

If there are any of you out there thinking about buiding this amp now would be a good time to grab one of these boards. Please email to alex@cavalliaudio.com. Please don't PM because the first two emails that I get will get the boards.

 

Thanks for the great run guys. This is a really nice amp. I hope you are all enjoying yours. biggrin.gif

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 #2151 of 2213
Thread Starter 

Gents, the boards are taken. Thanks again for building this amp.

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 #2152 of 2213

Wow, as one of the original prototype group, I feel a little sad.. Is this the end of the line for this little beauty?

 

Forsakenrider, with the density of components on the current CTH board, about the only way to  redesign would be to go SMD, and thats a hell of a lot of components to do that with, unless you've mastered the Toaster Oven or electric frypan techniques...

 

post #2153 of 2213
Thread Starter 

I don't think it's the end of the line, but the next incarnation of this amp will be in a somewhat different from with a slightly different design.

 

You're right about the component density. It will be hard to make a smaller board unless you either go SMD or tombstone the resistors. But then I think there will be heat issues.

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 #2154 of 2213

What a pity! . I 've finished one Mini 3 and  one gamma1+gamma2 and was interested in this amp as my next DIY project. It seems like a step up from Mini 3 yet not very expensive to build and compact. Also I am very intrigued by the tubes , not to mention that they look so cool. Ok, let's wait until next desing arrives, but in the meanwhile if somebody has one CTH board left  please let me know.

post #2155 of 2213

the mini3 is a portable amp and for the purpose it is a great little amp...the CTH however is a very significant step up from that...i mean like seriously big step up.

post #2156 of 2213

Wow. What a shame! I was just looking at building this amp. I'll have to have a look in FS forums to possibly find a board. If anyone has an extra that they'd like to part with please PM me.

post #2157 of 2213

Perhaps runeight would consider a PCB run if someone conducted a group buy and there was enough interest (handling the nasty $$ / shipping tasks).

If that happened, "bulk" ordering of the "pesky parts" (LM2595adj, coils) & including them would be something to consider.

 

I know he'd a rev of the board w/some improvements that might be used for future runs.  Perhaps he's also a few other changes up his sleeve:)

post #2158 of 2213
Quote:
Originally Posted by cfcubed View Post

Perhaps runeight would consider a PCB run if someone conducted a group buy and there was enough interest (handling the nasty $$ / shipping tasks).

If that happened, "bulk" ordering of the "pesky parts" (LM2595adj, coils) & including them would be something to consider.

 

I know he'd a rev of the board w/some improvements that might be used for future runs.  Perhaps he's also a few other changes up his sleeve:)

 

 

 You have both CTH and CKKIII amps . Which of these do you think would be best for K601 phones?

post #2159 of 2213
Quote:
Originally Posted by pterodactilo View Post

 You have both CTH and CKKIII amps . Which of these do you think would be best for K601 phones?

Can't give an *opinion* about this as I've never heard or owned K601s.  Suggest searching for your terms, using google against this site if you're not satisfied w/this forum's search. 

 

My current preferences, w/my gear/source/music/ears/etc, are for my 2008+ HD600s w/CTH.  And for my HD650s w/β22 (big) or CK²III (small).  This may be stuff for a different thread/forum.

post #2160 of 2213
Quote:
Originally Posted by MrSlim View Post

Wow, as one of the original prototype group, I feel a little sad.. Is this the end of the line for this little beauty?

 

Forsakenrider, with the density of components on the current CTH board, about the only way to  redesign would be to go SMD, and thats a hell of a lot of components to do that with, unless you've mastered the Toaster Oven or electric frypan techniques...

 



Well of course, I dont think it could be quite the same... But if we could come up with a pocket sized tube amp that maybe ran on some small lipo batteries (theres all sorts of rc airplane stuff these days) and used a pencil tube that would just be... too cool.

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