or Connect
Head-Fi.org › Forums › Misc.-Category Forums › DIY (Do-It-Yourself) Discussions › A Very Compact Hybrid Amp
New Posts  All Forums:Forum Nav:

A Very Compact Hybrid Amp - Page 126

post #1876 of 2213
Quote:
Originally Posted by keyid View Post
stacker II kits! I hear theres a new prototype
Wouldn't that be nice... Doubt we'll see these. Wishing it goes commercial.
post #1877 of 2213
Quote:
Originally Posted by BoxOPwn View Post
Can PCB's still be purchased from Spruce Canyon Labs?
No. Contact runeight directly.
post #1878 of 2213
Quote:
Originally Posted by keyid View Post
whats next bill? stacker II kits! I hear theres a new prototype
Nope. Heads down away from the hobby for a bit. Except maybe a small project or two.
post #1879 of 2213
Quote:
Originally Posted by wiatrob View Post
Just to let everyone know, Spruce Canyon Labs CTH kits are sold out, and will not likely be restocked in the future. As previously stated, Cavalli Audio will now supply PC boards.
Looks like i took one of the last kits from Bill Thanks again!
post #1880 of 2213
For now I suppose that prospective CTHers can get PCBs from runeight & full BoM spread is up there. Maybe Bill or someone can share actual Mouser & Digikey BoMs to assist.

Yep, owe Bill a debt of gratitude. Putting together 150-old piece kits takes dedication
post #1881 of 2213
I'd be happy to share mt latest Mouser/DigiKey BoM, has subs for obsolete parts, etc. As soon as I get a chance I'll post it and send a copy to Runeight.
post #1882 of 2213
Ive just recieved confirmation that I have got the last kit via Bill. Looking forward to recieving it.

1st post too!
post #1883 of 2213
Quote:
Originally Posted by wiatrob View Post
I'd be happy to share mt latest Mouser/DigiKey BoM, has subs for obsolete parts, etc. As soon as I get a chance I'll post it and send a copy to Runeight.
I probably will regret not getting one of these while I had the chance, don't you think? But I have to remind myself, just when would I get to listen to it with all the other amps crammed into my house?
post #1884 of 2213
Hey guys,

Been working on a couple of CTH boards here and both seem to be having the same problem, which is, the E12 is tripping ON and OFF every few seconds. I haven't tried BOM coupling caps yet as I think I am out of those at the moment.

All voltages are checking out fine, the inputs to the ICE are both rock steady at 11.7/8 volts but the output of the opamp is varying continuously.

Any help is appreciated. Edit: I have tried swapping opamps and that didn't help it any.

I hate the damn E12.
post #1885 of 2213
Quote:
Originally Posted by sachu View Post
I hate the damn E12.
  • Think you'd hate an amp that needs e12 & doesn't have one & blows your cans much more. Sure the muting delay & pwr-off cut-off are most important, but it might also be catching build errors.
  • As Alex says, CTH e12 is derived from original, so we should say "CTH's e12" when complaining about it.
  • Having finished another one, once I brought my CTHs up to *current* BoM spec have not had any CTH e12 problems.
  • You have the most experience debugging these things
Quote:
Originally Posted by sachu View Post
Been working on a couple of CTH boards here and both seem to be having the same problem, which is, the E12 is tripping ON and OFF every few seconds. I haven't tried BOM coupling caps yet as I think I am out of those at the moment.
Did this build ever work properly? Assume you've tried a couple tubes...
Did you use new parts from the new BoM, install cleanly & wash the flux off?
Do the relay input leads show offset sufficient to trip CTH's e12?
IOW, ia this a case of the circuit doing its job & detecting build problems (or actually something w/CTH's e12)?

BTW I had a theory about why some had CTH e12 probs wwaayyy back w/old BoMs & w/large coupling caps on long leads. Maybe they were installed incorrectly. The outer foil is supposed be input (tube side) & inner foil the output. If one installed them w/outer foil on output I'd expect the cap to pick up more EMI & perhaps cause more noise & offset flux.
post #1886 of 2213
Quote:
Originally Posted by cfcubed View Post
  • Think you'd hate an amp that needs e12 & doesn't have one & blows your cans much more. Sure the muting delay & pwr-off cut-off are most important, but it might also be catching build errors.
    Aye..though my big amps don't use this and the only thing I am afraid of is a power outage while listening to either of them
  • As Alex says, CTH e12 is derived from original, so we should say "CTH's e12" when complaining about it.
    Indeed..but the original circuit is quite the pesky little thorn in the backside too
  • Having finished another one, once I brought my CTHs up to *current* BoM spec have not had any CTH e12 problems.
    This is the first of which I have had too since the latest spec..and two in a row!!
  • You have the most experience debugging these things
    Heh, so some people say

Did this build ever work properly? Assume you've tried a couple tubes...
Did you use new parts from the new BoM, install cleanly & wash the flux off?
Do the relay input leads show offset sufficient to trip CTH's e12?
IOW, ia this a case of the circuit doing its job & detecting build problems (or actually something w/CTH's e12)?

They are new builds actually..just had the parts lying around for ever now and so decided to finish them up. I will check on the voltages on the relay tomorrow (just got finished fixing the non working board on my EHHA..am tired now, but relieved. . Yes the flux has been cleaned off with rubbing alcohol, caught a few mistakes when i did my pre power up checkups (really should stop soldering late at night)

BTW I had a theory about why some had CTH e12 probs wwaayyy back w/old BoMs & w/large coupling caps on long leads. Maybe they were installed incorrectly. The outer foil is supposed be input (tube side) & inner foil the output. If one installed them w/outer foil on output I'd expect the cap to pick up more EMI & perhaps cause more noise & offset flux.

Hmmm, what exactly do you mean by inner and outer foil? The way i have it now is that the caps are tombstoned and the leads are exposed on the buffer side. I gather that is probably troublesome?
My replies in italics.
post #1887 of 2213
> They are new builds actually..just had the parts lying around for ever now and so decided to finish them up.

I mean new parts as in unused parts & by new BoM I mean the current one from 8/27/09 (the latest BoM rev. I believe).
Yes, not an amp to work on while tired, in a rush or toasted

> what exactly do you mean by inner and outer foil?

It may not be a biggie but it would make sense to me that the outer foil could pick up wide-range EMI spikes (e.g. relay click) & if connected to output could pass them. Whereas using the outer foil as input (connected to tube) might block some of this along w/the DC it blocks. Just me guessing tho.
My bet is that w/new (8/2009) BoM parts this doesn't matter & a properly built CTH is rock solid regardless.

Search "inner foil" here, here and here for a start.

Good luck & watching the DC offset @ input to relay should narrow the prob.
post #1888 of 2213
Quote:
Originally Posted by cfcubed View Post
I mean new parts as in unused parts & by new BoM I mean the current one from 8/27/09 (the latest BoM rev. I believe).
yep..all new parts and based on the indicated BOM spec.

I will take some measurements today and see where i get.
post #1889 of 2213
What would you say about the CTH plus senn hd600, does anybody own this rig?
I'm going to buy 'em, since they are more neutral than the hd650.
post #1890 of 2213
I've got a pair of HD580s that I use with a CTH at home and they sound very nice. Not quite the same as 600's but I've heard rumors that they are very close(same drivers), and there has to be a reason Sennheiser obsoleted the 580s (too close to the 600s?).
I've got a 650 cable and 600 Grills on mine, not sure how much diff it made, the cable is much more robust, and I like the look of the 600 grills(although they are not as cheap any more).
New Posts  All Forums:Forum Nav:
  Return Home
Head-Fi.org › Forums › Misc.-Category Forums › DIY (Do-It-Yourself) Discussions › A Very Compact Hybrid Amp