Looking to build a tube integrated

[PB2]

comments on HK designs

Just noticed that this design uses heaters of the preamp tubes as the output tube cathode bias resistor. I would not do this, they did it to save a few bucks, not a good idea:
http://www.angelfire.com/electronic/funwithtubes/Rst_Harman-Kardon_A-300.html

Here we see another similar HK model, that uses the 12AT7 as I suggested, this is better but I'd use fixed bias, UL output, and avoid the voltage doubler power supply. I'd use the ST-70 output stage:
http://www.ampslab.com/SCHEMATICS/HarmonKardonA250.jpg

Pete B.

 

[langtuhanoi]

Labjir,
Can you share with me the schematic for amplifier DIY is the same of PrimaLuna integrated amplifier Prologue One
This amp matching with my Evo-30 speakers
Thank so much

Anybody have any good ideas for building a good 30-50 watt tube integrated amp. Something with fast transparent midrange, great soundstage and fairly tight bass. Simple design too.

Hoping to find something which will sound as good as the best current commercial offerings?

After doing a lot of reading I don't feel confident that there is.

Some of the projects may be neat to build, But do we end up with a great amp when we are finished or just a fair sounding amp?

 

[labjr]

I don't have a schematic for the Prima Luna. I looked around for one a while back but no luck. I couldn't find the whole circuit for the Cayin either. Let me know if you find anything.