Hiraga "le monstre"

[neazoi]

Originally Posted by danieljw

the switching off to charge idea even better !

another thing i did some rough calculations...

say the battery is 80Ah@12V that is 960Wh per battery total 1920Wh
the amp draws a continous (maximum) 12 watts or so for a stereo pair 24W

the run time is more than i expected originally..
maybe more like 40h ?!??!??!?!?!

not sure if this is accurate depending on the discharge curve of the battery

-Dan

Yes 80Ah is just too much for this small amplifier.
Have in mind that you calculate this for the whole capacity of the battery, but the battery mush NOT be discharged lower than 25%. So it won't last 40h but much less. I would safely say about 3-5 hours of continuous operation and maybe more, which is more than fine for a day listenning. Then you can recharge the batteries at night.

but come one... who has so much time to listen so much music per day, so maybe you need to charge them every two days?

By making an automatic charging circuit as described above you will never have in mind about charging the batteries any more

Since we all have to think about ecology these days, the people that have solar pannels at home can charge the batteries slowly from the pannels and then consume bigger power from the batteries. You are saving energy this way and this is another pros of the battery PSU

[Tyimo]

Ralf!

If i found a amp, which is definately better (im my chain and personal taste) i would change to class a or whatever.

Than You should look for some SE choke loaded amps...

What do you use for DAC? The PC sound card? M-Audio?
Is the PC not noisy? I mean mehanical and electrcal too?

Greets:

Tyimo

[ralf]

Originally Posted by Tyimo

Ralf!

What do you use for DAC? The PC sound card? M-Audio?
Is the PC not noisy? I mean mehanical and electrcal too?

Greets:

Tyimo

Hi,

no, my PC is dead silent. Seting up a silent PC ist no problem today.
I use the DAC`s of the soundcards.
I change between different cards like Terratec, Lynx, etc, which have very good DACS onbord. If you look at the specs- you dont find an amp, which can deliver sn/ratios etc. of a good soundcard.

With my speakers, which have a sensitivity of about 112db w/m you hardly can hear minimal noise. There is no buzz or hum.

best,

[ralf]

Hi together,

this are my experiences of Battery Supply with Monstres:
I used two SLA Batteries, buffered with 2 farad. I could switch between Battery and standard PSU (regulated), while musik was playing.

in my setup i clould hardly hear any diferences.
If you look in the web- most people recommend SLA Batteries.
Car Batteries produce GAS, which can expolde! If you have no possibility for ventilating car batteries in a living room - dont use it, even if it`s much cheaper.

I use SLA Batteries for my T-Amps, because it`s cheaper than a good regulated PSU. My T-Amps, driven with digital psu didn`s sound better or bader the with batteries.


One thing to monstres:
After Monstres i build some JLH 2003 Version.
I dont know, why so less people give JLH a chanace.
It was much clearer than Monstre and had more impact.
Monstre was a litte bit too smooth and reluctant for my personal taste in my setup to that time.

best,

[Tyimo]

Neazoi!
Where did you buy those nice big heatshinks and aluminium case?

Tyimo

[carolus]

hi "monster lovers",
I show my home made monster "octopus" (built in '89 base on AF Nr27/29/31),

Total: 8 (=4x2) monster units, (with pré-amp en actif filter kaneda),
Tr, 2SC1775/2SC74/2SK170/2SA872/2SB716/2SD756=2SD844=2SD718/2SB754,
Stable operation (DC-output),
Total capa appr 1 F ( with power of 45" music),
Power supply:
First: with (big) batteries (floating psu with LM338 with correct ventilation), annual electricity cost "exorbitant" (problems with WAF),
Second: with transfo 500VA (no regulation and a pleasant WAF),

In fine:
Great music scène (deep low & fine high) , with full 4-way horn system,
One musical note: since i use a (home made) OTL my "octopus-monster" is in the garage (a beatiful vintage monster)....

Greatings from Brussels,
Allez, salukes
Karel

[neazoi]

Originally Posted by Tyimo

Neazoi!
Where did you buy those nice big heatshinks and aluminium case?

Tyimo

Nice pair, isn't it?

Finding the heatsink was difficult. It is taken out from an old 200Watt FM radio amplifier and it cost me 40 Euros! (ouch). It is much more than this amplifier needs but it will ensure a cool running operation.

The front pannel is from a commercial kit box and it is made of anodized aluminum. It has two little lines at the edges so they give it a good design.

The holders have been taken out of an old compaq pro-liant rack mountable computer server and they have been a bit polished.

The on/off switch uses a key lock, which has been bought from a local electronics shop.

Finally, I could not decide what colour led to put on the front pannel so I have chosen an automatic colour changing led, which progressively switches in 16 colours

[neazoi]

Originally Posted by carolus

hi "monster lovers",
I show my home made monster "octopus" (built in '89 base on AF Nr27/29/31),

Total: 8 (=4x2) monster units, (with pré-amp en actif filter kaneda),
Tr, 2SC1775/2SC74/2SK170/2SA872/2SB716/2SD756=2SD844=2SD718/2SB754,
Stable operation (DC-output),
Total capa appr 1 F ( with power of 45" music),
Power supply:
First: with (big) batteries (floating psu with LM338 with correct ventilation), annual electricity cost "exorbitant" (problems with WAF),
Second: with transfo 500VA (no regulation and a pleasant WAF),

In fine:
Great music scène (deep low & fine high) , with full 4-way horn system,
One musical note: since i use a (home made) OTL my "octopus-monster" is in the garage (a beatiful vintage monster)....

Greatings from Brussels,
Allez, salukes
Karel

I enjoy seeing these pictures of yours, nice work.
But I can see some bad quality components on the amplifier, which is maybe the reason for some of your problems?

The most important thing for this degration I think is that you used the amplifier with the octopus preamplifier. I have no idea about this circuit but I can see plenty of low quality caps on it which may not be good.
There is no need to degrade the direct coupled topology of the le monstre by using a full-of-caps preamplifier. Have you ever tried it directly from the CD, without using a preamplifier?



The only thing I am worying about the le monstre is that it is a push pull circuit, so cross distortion may occur. Does anyone have some comments on this???

[danieljw]

Originally Posted by ralf

Hi together,

this are my experiences of Battery Supply with Monstres:
I used two SLA Batteries, buffered with 2 farad. I could switch between Battery and standard PSU (regulated), while musik was playing.

in my setup i clould hardly hear any diferences.
If you look in the web- most people recommend SLA Batteries.
Car Batteries produce GAS, which can expolde! If you have no possibility for ventilating car batteries in a living room - dont use it, even if it`s much cheaper.

I use SLA Batteries for my T-Amps, because it`s cheaper than a good regulated PSU. My T-Amps, driven with digital psu didn`s sound better or bader the with batteries.


One thing to monstres:
After Monstres i build some JLH 2003 Version.
I dont know, why so less people give JLH a chanace.
It was much clearer than Monstre and had more impact.
Monstre was a litte bit too smooth and reluctant for my personal taste in my setup to that time.

best,

I have built a JLH 2003 - I agree it is a very good amplifier.

Personally I thought the monster was slightly better - but i think perhaps speakers make a big difference as always.

PS Neazoi, dont worry about cross over distortion it is class A so each transistor is always conducting and does not "switch off"

-Dan

[ralf]

Originally Posted by carolus

hi "monster lovers",


In fine:
Great music scène (deep low & fine high) , with full 4-way horn system,
One musical note: since i use a (home made) OTL my "octopus-monster" is in the garage (a beatiful vintage monster)....

Greatings from Brussels,
Allez, salukes
Karel

Hi,

which homemade OTL`s did you make?

Ralf