[i luvmusic 2]

Thanks!The switch is 4PDT ON OFF ON to switch from 6.3VAC to 12.6VDC for the 6SN7/12SN7 tubes heaters UP position is 12.6VDC and down is for 6.3VAC and on top of the chassis it have a LED VOLT METER for the 12.6VDC output For the CAPS i have none of those caps you mentioned so i can't do a comparison.I have a kit that i build many moons ago this one have mostly FILM CAPS all MUNDORF comparing this kit to these AMP that i just finished they do sound very similar so i guess those MUNDORF Electrolytic CAPS does a good job.Talking about maximising a space,Did you noticed their is no VOLUME CONTROL?I ran out of space for it LOL

 

[whirlwind]

This is a great thread....great job guys.

 

[i luvmusic 2]

Thinking of building a PREAMP...

Oh boy this hobby.

 

[i luvmusic 2]

Here is the preamp that i just finished.

And of course the rats nest

 

[pezbot]

What kind of transformator and and powersupply would you guy's recomend for this?
I live in Norway and have 230vac from socket

It's a little dubious to start thread about my DIY amp, since i'm not any pro with these electric things. Just have made couple working headphone tube amps before this.

So here is photo of my contraption with 6080WC tubes.

And here is schematics for one channel.




As you can see it is simplified from some schematics from internet.

And what a mess it is inside.


Box is little too small for this kind of amp. Cast aluminium Hammond 1550J 275x175x63mm.

B+ supply is made with full wave bridge rectifier. After that is 1H 300mA choke and then two parallel 1000uF 250v capacitors. After that there is 1000uF's for each channel loaded with 68ohm resistors. Heaters have also DC with 22000uF capacitor.

Volume potentiometer is ALPS 100k stereo LOG. Transformer is inMADout TA34M100.

Amp works perfectly with 6SN7's as powertubes too. Driver tubes run very low power, I think 470ohm resistors could be as low as 270ohm, but how much this could add amp output power, i do not know. Also from 6AS7's could take much more power with lower resistance resistors, but i have not needed more power. Total power consumption of amp is around 85w with 6SN7's and 6080's.

At least i'm very happy that this thing works without hum and measured frequency response is totally flat between 10-20000hz. Now i just need more tubes to roll.


I DO NOT SUGGEST BUILDING ANY TUBE AMP WITHOUT ANY EXPERIENCE OR UNDERSTANDING. Voltages inside these amps are pretty much lethal.

Edit: changed something to schematic. 6AS7 anode resistors from 270ohm to 150ohm.

 

[Kitchener]

This thread is pretty much DIY porn.

I’m nurturing a fantasy of one day building my own stereo amp.

Thing is, I know nothing of circuitry and my only experience with DIY electronics comes from building a Crack and some keyboards.

Can’t read schematics worth a damn.
-I can recognise resistors, caps valves and trannies but it’s like recognising words in a foreign language.
And the maths behind the Watts, Volts, Amperes, Henries, Ohms? Not a clue.

But I’m decent with a soldering iron.
And a desire to learn goes a long way, I’ve heard.

Is there any literature any of you would recommend to a neophyte or some handy guides that could set me in the right way?