Destroyer x Amplifier...Dx amp...my amplifier

[destroyer X]

Mine is not using, and temperature there is 37 celsius as i publish the image measuring that temperature...not a problem.

But using heatsinks you will work with lower temperature..this will make your amplifier work till year 2300 than the 2200 life expectations.

Well...will not be working, as speakers will be substituted by sensors in your skin.... behind the ear.... power will be microwatts.

hehe...future will be very interesting....you will control emotions.... try to imagine not to laugh when your receive the informs your damn boss died!....in the future you will have a button to turn you sad... very convenient..adequated.. a nice
behavior....hehe

And yes...you are rigth Nordic...i have suggested the use of heatsinks...see the image i have posted monthes ago.

Carlos

[destroyer X]

A couple of weeks will be used during those testings.

A laboratory tests will be performed...all needed instruments will be used into a research of distortions.

Listening A to B blind testing will be performed too.

regards,

Carlos

[destroyer X]

I am very proud about it...and happy with Greg too.

regards,

Carlos

[HOEK]

Hello

What amps will be used with blindtesting ?

[Nordic]

Dag Hoek, I assume he means the 3 biasing options etc...

[HOEK]

I understand



groet hoek

[destroyer X]

Also he knows how to compare, the blind testing method.

For sure he will compare, to check if really, using this board, the amplifier can perform so good as more expensive units...as the idea was to make something simple and cheap that could not be ashamed by other amplifiers.

Even to loose in something is reasonable, as we have to pay the price by the simplicity and the low diy home production cost.

Many famous amplifiers are there in Greg's home...and many of them in the same power ratio...some are Kits and others are industrial made units from the seventies and eigthties..

He may check the quality of audio reproduction not to be fooled, as designers and partners use to be a litlle biased....and A to B, beeing blind, is the tool we have to obtain more precision in the judgement made.

But do not wait the publicity alike "Dx amplifier smashed Thatone"...this is something we do not like....i dislike this behavior...a dirty action, and also Greg will never do that.

To cut designer heads is not our dream...just to publish real words....all we need is to check is:

"Dx amplifier, even beeing simple, and also cheap, can be compared to expensive and famous without be ashamed...can even lost...but never by a big difference"

This is the idea...to respect all others, as they are very good units, made by respectable folks and I did not made an amplifier to be candidate to forum bad guy, to be the Bandit.... the opposite, my real dream is to see all bad guys banished from this nice forum.

All them forming a strip, not a long one, as they are not too many...and having in their hands one way ticket to hell.

regards,

Carlos

[Nordic]

How important is hFE on drivers? I think my tip42s are fake...

Will order replacements from RS components to double check, but all mine measure hFE several times higer than max in datasheet.

[destroyer X]

But of course, the amplifier will work better ballanced if complementary ones (drivers and output) are matched in gain.

Of course differential is the most sensitive to gain unballances.

Voltage amplifier needs the highest possible gain...select them by gain to the voltage amplifier position.

PNP transistors use to have bigger gain related NPN.....i have some TIP42 with 142 of gain...and also some TIP41 with only 70.

Off course this is not good...but i have tested them, and sounded nice anyway...do not ask me how this could happens because i cannot tell you the reasons of that.

regards,

Carlos

[Graham Maynard]

Hi Nordic,

High gain at low current is a characteristic of TIP devices.

Cheers ...... Graham.