Head-Fi.org › Forums › Misc.-Category Forums › DIY (Do-It-Yourself) Discussions › OTL CLASS A TUBE AMPLIFIERS
New Posts  All Forums:Forum Nav:

OTL CLASS A TUBE AMPLIFIERS

post #1 of 20
11/19/10 at 10:30am
Thread Starter 

6SL7 / 6V6 GT class A     OTL headphone amp    SOGNO

sogno.JPG

Reply
post #2 of 20
11/19/10 at 12:33pm

So stranger, what ya driving with it?

Reply
post #3 of 20
11/20/10 at 1:45am

Welcome to head-fi.

 

Strange first post old friend. Any more clues as to the point of the thread?

Reply
post #4 of 20
11/20/10 at 2:43am
Thread Starter 

Hi,

this diy headphone amp its a modified version af a classic ciuffoli otl headphone amp.

same conception, but both triodes of 6Sl7 are paralleleds ,

the 6V6 are in pseudotriode mode , cathode resistors , non inductive 25 watts ,

mounted on front panel aluminium 5mm , (wen the amp its ready front panel its warm).

HT come slowly in 3'.

i'm sennheiser france technician,

so i tray many higt grade headphones.

the HD 800 demand to take a sit, just wonderfull, time stop and you are in the middle of the orchestra.

my headphones : HD 25 III 600 ohms, HD 515 50 ohms , SONY CD 3000 32 ohms.

everyone tray it , was stupefied

sorry for my bad english, i'm italian.

Reply
post #5 of 20
11/28/10 at 9:01am

Was it expensive to build?

Reply
post #6 of 20
12/11/10 at 9:10am
Thread Starter 

not so expensive.

chassis its abs 1U rack

alu front and 2mm aluminium top

tubes russian reflector nos military   

power transformer made in italy by novarria

octal sockets, very good capacitors ands PR2 resistors

catode non inductive resistors,

btr screws, neutrick jack outputs, gold chink inputs.

it cost me 250 euros

but the result its magnificent.

and i can sell it easyli at 500 euros.

it can drive grado 32 ohm and sennheiser 300 or 600 ohm

easy

but need  labour and experience.

sorry for my bad english

claudiomas

Reply
post #7 of 20
12/11/10 at 11:11am

Would you be kind enough to share a schematic?

Reply
post #8 of 20
12/11/10 at 11:17am

x2 on the schematic. I've suggested this thread be moved to the DIY forums since I would assume the average viewer there is more into this stuff.

 

 

Reply
post #9 of 20
12/11/10 at 3:12pm

Cool looking amp :)

Reply
post #10 of 20
12/11/10 at 9:11pm

Sennheiser HD800's and an OTL (what appears to be SET) sounds like a very interesting match.

 

Looking forward to looking at the schematics.

Reply
post #11 of 20
12/11/10 at 11:32pm

6c33c_1.gif

 

6c33c_1.jpg

 

 

For those who are unfamiliar with the Ciuffoli 6C33C OTL. It appears that the OP has modified the schematic, however.

Reply
post #12 of 20
12/12/10 at 1:07am

Claudiomas your english is fine.Are you likely to build any more of these?

Reply
post #13 of 20
12/12/10 at 5:28am
Thread Starter 

ampli_10.jpg

 

p1000412.jpg

 

p1000414.jpg

 

p1000415.jpg

 

the original ciuffoli schematics:

ciuff1_3a.gif

 

 

this its not my first headphone amp, not my last.

thanks for the interest

claudiomas

Reply
post #14 of 20
12/12/10 at 5:35am
Thread Starter 

p1000513.jpg

 

thd_sn10.jpg

 

thd_so10.jpg

 

thd_so11.jpg

 

Reply
post #15 of 20
12/12/10 at 9:04am
Thread Starter 


 

Quote:
Originally Posted by MrGreen View Post

6c33c_1.gif

 

6c33c_1.jpg

 

 

For those who are unfamiliar with the Ciuffoli 6C33C OTL. It appears that the OP has modified the schematic, however.

Mr Green

i come from old scool,

less components,

best soud, easy tuning.

the ciuffoli 6C33 OTL

should be a 1class amplifiers,

but let Mr Ciuffoli OTL class A basic design

be the best for DIY,

ground hum its easy to solve

very fews resistors and condenser,

the tubes  class A SE OTL

y love it.

and i'm not alone.

 


 

Reply
New Posts  All Forums:Forum Nav:
  Return Home
Head-Fi.org › Forums › Misc.-Category Forums › DIY (Do-It-Yourself) Discussions › OTL CLASS A TUBE AMPLIFIERS