L'Amp: A simple SIT Amp

[generg]

Originally Posted by Zen Mod

resistors vs. plain CCS vs. Mu (out from SIT drain ) , speaking strictly about Lowther part of presentation ?

than Varislope included in Mu ....

yes always keep in mind I play with Lowthers PM6A and Tone Tubby and at the moment I did not test CCS because that would demand changing my PSU again back to other voltages.
So my comparison is at the moment only the resistor (thick film) solution against the Mu with three different output nodes, after the SIT drain, in the middle of the resistor network (0,47/o,47) and at the source of the upper Semisouth.

The Mu might be a solution to drive more demanding speakers......

the plain solution Mike showed up to now is the finest sounding for less demanding situations ......

in my opinion, I hope we will hear more opinions here...

[generg]

I took these one....

Widerstände 50W bei reichelt elektronik

And combined four 10 Ohm, some 1 ohm and one 1,5 Ohm all 50W. The resistors on my heatsink got no more very hot but the sink did.....overall

[OlavHaal]

Hi all

Found this one - made in Germany - but how it will function in this amp?
I don`t know, and it is somewhat expensive - but then you need only one. Plus 1 or 2 small 50 watt in serie.

It is 10 ohm/300watt

Produced by: can`t say I know the name Type:BRQ-10R0-10-L


Best

Olav

[juanitox]

i'v got a 10ohms vishay thick film res , but as i sais the problem is with the heat , you must use heatsink as big as for the 2SK82 or it can be dangerous to lay a hand on it ...

i use this one , for the price of Two you can buy a built amplifier

[generg]

Originally Posted by OlavHaal

Hi all

Found this one - made in Germany - but how it will function in this amp?
I don`t know, and it is somewhat expensive - but then you need only one. Plus 1 or 2 small 50 watt in serie.

It is 10 ohm/300watt

Produced by: can`t say I know the name Type:BRQ-10R0-10-L


Best

Olav

Olav, I would go for the parts of Juanitox, do not know his price

or the parts i used, the price for a 14 Ohm chain is about 30 € for one channel + delivery fees and as juanitox told you need a heatsink at least as large the SIT sink...

I can order and send them to you if necessary.....

[OlavHaal]

hi and thanks for the offer - kind of you, but I can get the resistors you have for around 300 euro(estimated) in Norway. That will be the same price as one of them i had a picture of in my last post. I just wondered if it was easier to mount the one I found on a smaller heat sink!
But as juanitox says - the heat sink will be as big as the one on the SK82. So maybe I will stick with something like you have generg!
I have slowly bought piece by piece now-but still a bit to travel. I Have found a heat sink that is 0.5 C/W that fit TO3-which is 150x125 mm-50 mm high. Same price as the resistorsload(nearly). But must negotiate somewhat with the WAF before I buy to expencive parts. Take one step at a time - getting fairly good bits and learning along the way.

And the Heat Sink you have for your resistense-chain generg is - how big? If I may ask?


Thanks for all your input!!

Best

Olav

[OlavHaal]

Sorry all!

I meant around 30 Euro - the amount I said 300 was in Norwegian kroner. They are around 1-10!

Sorry - but writhing in English make you count foolish at times!!

Norway is expensive - but not that much!

Olav

[generg]

Happy you can get them for 30.-€......!

I can promise you your ears will not believe the sound.....

of course you get accustomed to it after 2 days......

like always......

[Roscoe Primrose]

I plan to use 4 of these in parallel per channel: MP9100-50.0-1% Caddock Thick Film Resistors - Through Hole

Roscoe

[Tea-Bag]

Originally Posted by Roscoe Primrose

I plan to use 4 of these in parallel per channel: MP9100-50.0-1% Caddock Thick Film Resistors - Through Hole

Roscoe

Do we really need 400W of resistors per channel?

Why not two, and run them hot?

Also found similiar to the caddocks.

Mouser Electronics - Electronic Component Distributor TEH100M