L'Amp: A simple SIT Amp

[Michael Rothacher]

Yes, those and others. I'm afraid I don't have an impedance plot for them, perhaps the manufacturer can help.

 

[Antoinel]

Yes, those and others. I'm afraid I don't have an impedance plot for them, perhaps the manufacturer can help.

Thank you for responding. I'll ask the manufacturer.

 

[carlomar]

Hello,

i have followed closely this nice tread, and is time to build my Simple Sit amp.

First i am planing to try L'amp version, and then Hammond 193 Version.

My question is,
do you think i can use (for economic reasons) hammond 193T instead 193V?

I now they have lower inductance(50mH) and only 2A current. Resistance is quite similar.

http://www.hammondmfg.com/pdf/5c0033.pdf

Of coarse Bias will be 2A Max, or lower.

Someone tried to use 193T?

Do you think 193T could be an option, although less features?

Thanks

 

[Michael Rothacher]

In my opinion, 100mH is about the practical lower limit if you intend to use this as a fullrange amp. The 193V is worth the extra $50. And, in the meantime, you may decide the lightbulb version is all you need.

 

[vdi_nenna]

The article says about 12w with transfo? That's nice cause my 5w CCS version is plenty loud.
I'd say it's worth the extra dough.

 

[carlomar]

In my opinion, 100mH is about the practical lower limit if you intend to use this as a fullrange amp. The 193V is worth the extra $50. And, in the meantime, you may decide the lightbulb version is all you need.

Thank you Michael for your answer and also for sharing with us your excellent work.

 

[juanitox]

for the 193V sit guys , i have found a 2.5amp 4V battery for the bias .

few years to come with this one

Batterie cyclon 0819-0010 4V 2.5Ah - AMP3706 | All-batteries.fr

 

[nicoch58]

An externally hosted image should be here but it was not working when we last tested it.

 

[i_should_coco]

Bit late to the party, but hey ho.

This is my attempt. Vishay thick films instead of lightbulbs as a load and CLC power supply using some 280mH surplus chokes I had. Weights it at a cool 28kg! That's an even worse power/weight ratio than the valve amps I normally build.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

 

[vdi_nenna]

Nice build. What value did you use for the Vishay thick film? 16 ohms?

 

[i_should_coco]

Thanks!

I used 12 Ohms total. 5x 2R2 and 1x1R. Not experimented yet, though I have found a distortion minimum at about 2A. (1kHz, 1W)

 

[Michael Rothacher]

Very nice build.

 

[KASUMI]

that's a very nice build,given me some ideas on how I'll finish mine with the heat sink arrangement properley mounted vertically.
Whats it look like inside and what's the heat like from the resistors ?

 

[KASUMI]

What does it sound like
We'll definately need a SIT bake off now

 

[i_should_coco]

Yep, we should arrange something soon!

 

[tonywong]

This is my inductor SIT Mono-Block.

 

[tonywong]

More photo.

 

[Salas]

Now that is a wheeled monster amp. Impressive.

 

[milen007]

I have the chance to hear Tony's monstrous amp. All I can say is fenomenal. WOW Both vocal and power are presented with tremendous authority. Kudos Tony and thanks for the time to have us there for the preview

Regards
Erwin

 

[vdi_nenna]

That's heavy metal!