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el156 14th November 2010 03:55 PM

EL34 PP PROJECT
 
4 Attachment(s)
Here are so fotos of my latest project...

E88CC as input tube

ECC804 as phase splitter

M Gregg 14th November 2010 04:09 PM

el156,

Nice project!

Palustris 14th November 2010 09:27 PM

I love the curved front and the overall design.

richwalters 15th November 2010 08:57 AM

Youre lucky getting rid of the heat isn't an issue.

el156 15th November 2010 09:36 AM

Well, it is a newbie project,but i am not very happy with the sound ,it seems doesnt have enough power, but i will post the schematic to get your opinion about it, maybe i havesome mistake in there!
Thank you for your comments
EL156

richwalters 15th November 2010 11:58 AM

30W o/p with a pair of EL34's should be a breeze. Using 92dB/w LS sensitivity with good sized bass drivers should rock the room. This was a standard classic design of the 1960's and found amps of this everywhere in halls and theatres.

richy

artosalo 15th November 2010 01:53 PM

Quote:

it seems doesnt have enough power
Do you mean that the sensitivity is low, which means that your input signal can not give full output ?

Or do you mean that the output signal becomes distorted before the sufficient sound level is achieved ?

Can you show the chematic ?

el156 15th November 2010 02:25 PM

Quote:

Originally Posted by artosalo (Post 2365865)
Do you mean that the sensitivity is low, which means that your input signal can not give full output ?

Or do you mean that the output signal becomes distorted before the sufficient sound level is achieved ?

Can you show the chematic ?

I think sensitivity is ok , the signal comes distorted before sufficient sound level is achieved, I have to draw the schematic first to post it later on or tpmorrow.
EL156

el156 20th November 2010 06:15 PM

1 Attachment(s)
Okay ! Here is my schematic ! Maybe someone can tell me what is wrong with this schematic !
EL156
Sorry for the bad quality of pic
Thanks

toprepairman 20th November 2010 07:20 PM

EL34
 
Fair circuit so should work ok. I note there is no negative feedback so speaker impedance will have a big impact on the frequency respose (as per a typical guitar amp/combo) and matching the speaker impedance to the reflected output impedance will cosiderably affect power output. As a general rule you should load a typical 8ohm speaker to a 4 to 6 ohm tap to account for speaker impedance dips.
With the 380 volt supply I wouldn't expect much more than around 20 watts.
Here's another note for any other builders of ultralinear EL34 designs, you should never exceed a max of 420 for the HT, otherwise you will get flashovers between the screen grid and control grid, very nasty.
Incidentally this is my first posting on this site.


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