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A Very Compact Hybrid Amp - Page 118

post #1756 of 2213
Madness Smeggy! And how does it sound?
post #1757 of 2213
Quote:
Originally Posted by smeggy View Post
yay, pic!

http://img525.imageshack.us/img525/9240/cthtube.jpg

I really need to recase this thing.
Next up, replacing the coupling caps with a pair of Vitamin Q
Argh... Imageshack is not serving your cthtube.jpg pic ATM.

WRT e12 trips, we've given a list of suggestions as tall as your new tube... Could you let us know what you've tried (confirmed parts, measured offset, "desensitized"/slowed it down)?

I was getting trips w/toasted Q1P but once they started the CTH was unusable & LV went < 23.5V until I replaced it.
post #1758 of 2213
Bah, stupid imageshack!

Yes, I did the mods to the E12 to desensitize it. What I've been finding is that it seems to be sensitive to how it's placed in the socket. If it's unhappy it'll trip constantly the instant it disengages. Adjust the tube seating and it'll be happy all day.

I may need to airwire it to ensure it's happy in how the tubes are sitting. I can't see any problems with the socket or the pins. I guess why it was so hard to pin down as it didn't seem tube specific or anything else.

Sounds real nice too.

new pic after adding Vit Q caps



It's growing.....
post #1759 of 2213
smeggy, where'd you get the adapter?
post #1760 of 2213
ebay, they sell adapters for everything. 6sn7, 6f8g, 7n7 etc.

hmm, seems I've upset the wee thing. Now when I turn it on one LED is bright and the other is on at half brightness but the e12 isn't switching on. Any clues as to what might be amiss?
post #1761 of 2213
Quote:
Originally Posted by smeggy View Post
Any clues as to what might be amiss?
It died of shock!

If it was working before the the Vit Qs went in and now isn't it may be related to those, IIRC a few proto builds had problems when caps with long leads were used but I thought the E12 mods solved that. You could put back the Wimas and see if the problem is still there.
post #1762 of 2213
it was working fine with the vit's, something else happened and i can't find what
post #1763 of 2213
Gentlemen.. We need to have an intervention before Smeggy slips completely over to the Dark Side.. It may even be too late now.
post #1764 of 2213


I are doomed!
post #1765 of 2213
it looks like my rail splitter transistors.. Q3S - Q6S are blown.

Hopefully Frys stocks them, what exactly is 'the "25" HFE class device' and are they likely to stock them?

Common type?
post #1766 of 2213
Smeggy..wil send some transistors over to you in the package that is heading over to you (SFI pucks and cables)
post #1767 of 2213
Just checking in on this thread to report the birth of another CTH. Mine has been up and running now for a little over a week so I'm safely over the hump (knock on wood). Not much of problem with the build, but it sure is a tightly packed board and it's a complicated sucker for such a compact thing.

I used the standard kit with the longer hammond case. I swapped out the alps pot for a ebay chinese 10k stepped attenuator, swapped the headphone jack for a neutrik 1/4" and put a "color change" led under the tube. The color changing led gives a cheesy lava lamp-esque look as it rolls through it's colors. I kind of like it.

I'm very pleased with the sound. I've rolled about a half dozen tubes so far. A Seimens E88cc is the standout so far. A ECC82 tungsram is also pretty interesting. The USA made NOS tubes I've tried so far are pretty meh.

Based on my surprise at the quality of sound from the CTH, I've ordered 4 boards worth of EHHA. I have a cased dual S22 PSU with umbilical for my B22, I'll borrow it for the EHHA project. Hopefully it'll be interesting.

Anyway, thanks Runeight & cfcubed for the CTH project and wiatrob for supporting it with kits. I think I'll take my CTH to work next rotation which should make it the first CTH north of the arctic circle. Here's a couple obligatory pics from my ancient camera.




LL
LL
post #1768 of 2213
Most Excellent!
Welcome to the CTH club. Beautiful looking build.
post #1769 of 2213
Quote:
Originally Posted by bada bing View Post
Just checking in on this thread to report the birth of another CTH. < snip >

I'm very pleased with the sound. I've rolled about a half dozen tubes so far. A Seimens E88cc is the standout so far. A ECC82 tungsram is also pretty interesting. The USA made NOS tubes I've tried so far are pretty meh.

Based on my surprise at the quality of sound from the CTH, I've ordered 4 boards worth of EHHA. I have a cased dual S22 PSU with umbilical for my B22, I'll borrow it for the EHHA project. Hopefully it'll be interesting.

Anyway, thanks Runeight & cfcubed for the CTH project and wiatrob for supporting it with kits. I think I'll take my CTH to work next rotation which should make it the first CTH north of the arctic circle.
Good looking build. Glad you're liking it. You're building up quite a nice collection of amps there

BTW, Tube-wise I'm happiest using Amperex PQ 6922 (white label/Made in USA) w/my DT880s... At the moment anyway
post #1770 of 2213
listening to mine atm with with 53' Hytron 5814 its lush, euphoric but not sloppy with an expansive atmosphere. A very interesting signature that mates well with vocals and jazz.
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