6V6 stereo amp

[nIGHTWALKER]

Hi,
i have 4 new RCA 6V6 tubes and want to use them for my
first tube amp project. Surfing the web i found this
simple diagram. My speakers are Wharfedale 7.2 Diamond
100W, 89db, 8ohm. Would this amp bee powerful enougt
for them? Is the diagram OK, is this class A amp?
What transformers shoud i use for the output?
As i live in europe the voltage is 230V could i make
the amp without the power transformer?

[jaudio]

look for a push-pull design to get around 15 watts. You will only get a few(4) watts with the design you have. Your speaker need to be highly sensitive

[pinkmouse]

Running an amp transformerless is not safe, and we do not condone it on diyAudio

[Brett]

Originally posted by nIGHTWALKER
Hi,
i have 4 new RCA 6V6 tubes and want to use them for my
first tube amp project. Surfing the web i found this
simple diagram. My speakers are Wharfedale 7.2 Diamond
100W, 89db, 8ohm. Would this amp bee powerful enougt
for them?

Probably not, unless you have a small room as your speakers are (by my reckoning) moderate/low efficiency.

Is the diagram OK, is this class A amp?

Diagram is OK to work from, the design so-so to my tastes. Yes, it's class A.

What transformers shoud i use for the output?

A single ended 5k:8 with about 50mA DC capacity.

As i live in europe the voltage is 230V could i make
the amp without the power transformer?

NO!

Originally posted by jaudio
look for a push-pull design to get around 15 watts. You will only get a few(4) watts with the design you have. Your speaker need to be highly sensitive

Nightwalker, send me an email and I'll email you back a PP design I've used that will give you 15W or so and that I know sounds good. The drawing I'll send you isn't mine, so I'm not sure if I can publish it, but is so similar to mine it's nearly identical (I have no scanner to send my schematic)

Originally posted by pinkmouse
Running an amp transformerless is not safe, and we do not condone it on diyAudio

Ditto.

[DigitalJunkie]

Use a power tranny!
Line-op stuff is dangerous,and scary.Not to mention potentialy lethal if you mis-wire something...And theres the risk that you could fry your stack of expensive equipment!

I've got a Push-Pull stereo 6V6 amp that I rebuilt,from an old Silvertone console..I think it's a pretty rockin amp after a few minor tweaks..

http://www.users.qwest.net/~ptaylor/...V6amppage.html

A little webpage I whipped up,(yes,I know about the typos,and the broken link...suppose i should fix that someday..)

My modified version,and the original schematic are there,along with the transformer data,etc.

The OPT's on this amp are kinda small,but it sounds darn good,and has suprising low end extention,considering thier size.. (Probably mostly due to the NFB.)

Good luck!

[jaudio]

this might help

[jaudio]

and this

[silurato]

And this:

http://www.webalice.it/jlc891/page13.html

[Geek]

Also, I would *not* wire the headphone connections that way (original posted schema) for a tube amp - you will need a swichable 8 ohm dummy load before the 330R resistors.

[Alex Kitic]

Hi, Nightwalker...

Try this one:

RH84

Yes, I know that it's for EL84... but the 6V6 is a very similar tube to the RH84. If you need further values refinement, just e-mail me (I think we speak the same language still... )! The circuit is better than the one you have posted, anyway.

When it comes to power, with 89dB/W/m you WILL have quite enough "loud sound" in your room. Do not let yourself be misguided -- the speaker is the element that distorts the most... every single loudspeaker has it's "breaking point" when it starts producing too much distortion, and that is far from the max. power input acceptable by that loudspeaker. Therefore, you speakers will sound just as loud (i.e. with acceptable distortion) with this amp (or any other amp of similar power) as they would with an i.e. 20W, or 100W amp, for that matter... try it to believe it.

One of the main advantages of high efficiency speakers is the fact that they "make much more noise" i.e. sound louder before hitting this "breaking point" of too much distortion.

Regards,
Aleksandar