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Old 16th December 2012, 07:19 PM   #4531
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Join Date: Aug 2012
Quote:
Originally Posted by lenamit View Post
A Russian product, low price
Well, that little old scope served me for quite some time.
After a diy-break of several years I turned it on and it worked for about two minutes. Power light is on, but nothing on the screen.
And I really need my scope now: I just finished the first mono of a new PP KT88. It is quiet, even on high efficient speakers, but I can't get stable AC readings on my DMM.
ECC99 LTP with a LM334 CCS as the tail, set for 5mA, directly coupled to a 6SN7 driver (shared 12k cathode resistor, 8mA total). The KT88's running in triode @ 465V, driven by IRF820A's as source followers.
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Old 16th December 2012, 07:21 PM   #4532
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Quote:
Originally Posted by Parafeed813 View Post
I can't get stable AC readings on my DMM.
I think you need to add gridstoppers on V1 and V2 to stop a possible oscillation.
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Old 17th December 2012, 10:32 AM   #4533
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Location: Victoria, Australia
"Menatzchim" C3m tube preamp in a 1UR enclosure with Jensen copper,paper and oil caps and silver leads. 3 switchable inputs on rear.
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File Type: jpg MenatzchimII.jpg (178.6 KB, 876 views)
File Type: jpg MenatzchimIII.jpg (171.2 KB, 821 views)
File Type: jpg Inside.jpg (221.1 KB, 345 views)
File Type: jpg InsideII.jpg (241.8 KB, 375 views)
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Old 17th December 2012, 09:07 PM   #4534
stenak is offline stenak  Norway
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Quote:
Originally Posted by mhouston View Post
"Menatzchim" C3m tube preamp in a 1UR enclosure with Jensen copper,paper and oil caps and silver leads. 3 switchable inputs on rear.
WHAT?! More than one tube in a stereo preamp?:
Beautiful amp!!!
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Old 17th December 2012, 09:17 PM   #4535
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Quote:
Originally Posted by mhouston View Post
"Menatzchim" C3m tube preamp in a 1UR enclosure with Jensen copper,paper and oil caps and silver leads. 3 switchable inputs on rear.
Hello
I do like these C3m tube a lot. Can you post your preamp schematic please.
Thank you

Greetings Gabor
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Old 17th December 2012, 09:25 PM   #4536
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Location: Victoria, Australia
Quote:
Originally Posted by stenak View Post
WHAT?! More than one tube in a stereo preamp?:
Beautiful amp!!!
Each tube only has a single pentode. I recommend you don't use a Ck but if you do 150uf is the valve. A 10V version is sufficient. I used a 0.47uf Jensen copper, paper and oil cap on the output. According to the designer (Matt) it is OK to use 0.47 and not 0.33uf.

Thanks for the nice comment.
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File Type: jpg C3M schematic.jpg (37.2 KB, 335 views)

Last edited by mhouston; 17th December 2012 at 09:28 PM.
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Old 18th December 2012, 09:58 AM   #4537
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Join Date: Oct 2012
Hey guys,

i also want you to show my KT88 Single Ended Amp. Its the best Amp i have ever build

In the photos you can see 2 different rectifiers, i changed it finally to the bulbed version of the 5U4GB.

A preamplifier is still in plan.
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File Type: jpg IMG_0355.JPG (877.9 KB, 255 views)
File Type: jpg IMG_0356.JPG (849.0 KB, 249 views)
File Type: jpg IMG_0295.JPG (506.9 KB, 357 views)
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Old 18th December 2012, 11:29 AM   #4538
12B4A is offline 12B4A  United States
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Location: Right here, on this screen
A clean, solid build. What kind of finish is that on the plate (the one pic makes it look gold-ish) and what are you using for feet?
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Old 18th December 2012, 11:59 AM   #4539
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Hi,
thank you.

The feet are from an old computer case from Lian Li (link to picture: http://i1-news.softpedia-static.com/...-Support-2.jpg )

What do you mean with plate? The main plate of the whole chassis? That ist just alumium color, the heaters makes it look like gold
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Old 19th December 2012, 03:07 AM   #4540
ysk6253 is offline ysk6253  Japan
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Hi folks
This is my first job
JFET direct coupled 6N6P push-pull with balanced input..

6N6P_02.jpg

6N6P_03.jpg

Last edited by ysk6253; 19th December 2012 at 03:37 AM.
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