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A Very Compact Hybrid Amp - Page 96

post #1426 of 2213
Quote:
Originally Posted by wiatrob View Post
I would say being able to keep your finger on ICH qualifies it as 'warm' but not dangerously hot. Unless you are a chef.
its pretty hot, but I my reference for heat by counting secs with a finger have been trained by normally testing soldering irons for heat requirements and skin buildup from awesome guitar solos
post #1427 of 2213
Quote:
Originally Posted by holland View Post
I've not encountered this. It sounds like it's almost not getting enough juice on start. The xformer is 1.6A?
its 1.25A too low?
post #1428 of 2213
Quote:
Originally Posted by keyid View Post
its 1.25A too low?
I have the fuzzy thingy on a couple of my CTH builds..but they go away a few seconds after power on.
post #1429 of 2213
That's good to know, sachu.
post #1430 of 2213
So I'd be on the safer side with a 50VA transformer?
Greetz Ava
post #1431 of 2213

Just to be clear, latest posts WRT heater are for > design loads.

Don't want anyone popping in to thread now to think they need to change anything other than C3H to 330uf unless they want to support tube heater loads higher than CTH was designed for.

IOW, my C3H revision guide stands for CTH target tube loads. And @ those loads, no other changes are necessary (ICH heatsink is NOT required, but does no harm).

Keep in mind the CTH "design center" is 12au7 variants and the design heater capacity supports 90%(?) of the tubes that could possibly be plugged into the CTH... Heater tweaks above the basic design may let it support tubes further away from its design center & that could be fun.

So if > 600ma (4W) series tube heater loads can be supported through some tweaks (the focus of these latest posts) maybe the tweak can make it to the CTH tweaks page when ready. Such a tweak may require switcher heatsink in tight quarters, etc.

Have fun gentlemen
post #1432 of 2213
YEs, CF - we should probably move this discussion to the tubes and tweaks thread...
post #1433 of 2213
Quote:
Originally Posted by keyid View Post
its 1.25A too low?
Should be fine. See Sachus comments.

Quote:
Originally Posted by Ynis Avalach View Post
So I'd be on the safer side with a 50VA transformer?
Greetz Ava

For normal use a transformer rated at .83A is fine. MOAR does not hurt, however...
post #1434 of 2213
Quote:
Originally Posted by wiatrob View Post
YES, CF - we should probably move this discussion to the tubes and tweaks thread...
Thanks Bill... We want thread readers to come away with the facts that:
  • Only BoM change since production release is C3H -> 330uf. And you've graciously offered to get the new C3Hs to your kit customers for little or no cost.
  • CTH tube compatibility, as designed, is large. Fleabay usually has > 500 listings for tubes compatible w/CTH in basic form.
  • CTH is an intermediate level project in its basic design form. And, based on other's comments & reviews, competes well against other DIY designs/builds (certainly those costing <= $200).
  • The only heatsink the basic CTH design requires is an internal one for the LV 24v reg. And casework is cake even w/o your extended kit offerings (see my avatar)

BTW Bill, you mean uH in your inductor values & uF in your cap values in some posts... Don't blame me, my wife is a technical writer/editor & she is always correcting me
post #1435 of 2213
I agree with everything CFCubed says! I continue to be impressed with the performance of this design.

More posts will end up in:

http://www.head-fi.org/forums/f6/cav...thread-417322/

Henry's and Farads Oh My! Chalk it up to dyslexia!
post #1436 of 2213
My loaner CTH will be ay CanJam with Naaman - he and Blutarsky have graciously agreed to coordinate getting it to the show so this little amp can get the exposure it deserves.

The fact that it's easily wedged in with shoes doesn't hurt either!

Naaman will have only one source and if anybody might have a spare to loan, or babysit the CTH for a bit, it would be greatly appreciated.
post #1437 of 2213
There will also be a CTH at the Whiplash Audio table and one at the CryoParts table
post #1438 of 2213
Quote:
Originally Posted by rds View Post
There will also be a CTH at the Whiplash Audio table and one at the CryoParts table
nice!!!
post #1439 of 2213
Quote:
Originally Posted by wiatrob View Post
My loaner CTH will be ay CanJam with Naaman - he and Blutarsky have graciously agreed to coordinate getting it to the show so this little amp can get the exposure it deserves.

The fact that it's easily wedged in with shoes doesn't hurt either!

Naaman will have only one source and if anybody might have a spare to loan, or babysit the CTH for a bit, it would be greatly appreciated.
I hope it is okay if I ask Blutarsky to leave my Mullard tube with me, so I don't have to worry about getting it back later? Unfortunately I wont have an extra source.
post #1440 of 2213
Quote:
Originally Posted by rds View Post
There will also be a CTH at the Whiplash Audio table and one at the CryoParts table
Now that is interesting. A nice surprise for me not knowing the players

Wondering if the builds are "standard" builds & whether they have the C3H revision. But w/the background "noise" at meets the corrected C3H is probably not so important...

Edit: Also curious about c4 couplers they might have. Think most that have WIMAs or Sonicap Gen IIs notice a subtle improvement.
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