Photo Gallery

[Parafeed813]

Originally Posted by lenamit

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.

[hidnplayr]

Originally Posted by Parafeed813

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.

[mhouston]

"Menatzchim" C3m tube preamp in a 1UR enclosure with Jensen copper,paper and oil caps and silver leads. 3 switchable inputs on rear.

[stenak]

Originally Posted by mhouston

"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!!!

[gaborbela]

Originally Posted by mhouston

"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

[mhouston]

Originally Posted by stenak

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.

[Wachtfels666]

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.

[12B4A]

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?

[Wachtfels666]

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

[ysk6253]

Hi folks
This is my first job
JFET direct coupled 6N6P push-pull with balanced input..

6N6P_02.jpg

6N6P_03.jpg