EL84 ECC83 SE Amp schematic

[stajo]

The circuit in this link will not work. 12AX7 cathode is drawn wrong.

It does work. Cathode is biasing thru OPT secondary and feedbacking from the same

 

[Shoog]

ECC83 is not substitute for 6N3P!?
Substitute for 6N3P is 2C51, 5670, 6CC42, 6385 or 396A.
ECC83 is substitute for 12AX7 and 6N4P. Very simmilar is 6N2P with different pinout.

My suggestion was as a substitute for ECC88 which I had recommended as a driver previously.

Shoog

 

[pointy]

http://www.audiofanatic.it/Schemi/Tipo/Valvole/finali/pic_finali_SE/EL84_ECC83_SE.jpg

 

[keveas]

Hi again

having obtained a copy of the mullard circuits for audio amplifiers

i was thinking about the 3 watt 3-3 using EF86 and EL84

any thoughts ?

 

[Shoog]

All the really old designs are specified for input signals considerably less than 1V (0.2V would be typical) and the modern sources typically have 1-2V signals. This means that a modern design needs typically 1/10th the input signal. The mullard 3-3 will have excessive gain with a CD/DVD source and will need input attenuation to make them match. For me this is simply a bad approach.

Shoog

 

[keveas]

Hi Shoog

Thanks for the reply

Yes that makes sense the old design
Being unstable for DVD or cd input

I am now thinking of using the schematic
You posted earlier with the 6N3P

The 6n3p seems easy to obtain

Or I have also looked at the RH84 version 2

Thanks again

 

[Shoog]

I think the design I posted is better than the RH84, the cathode feedback produces a more consistent result. If you wanted to try the approach discussed in the RH84 I would look for a better implementation.

Shoog