L'Amp: A simple SIT Amp

[Zen Mod]

and you can also play with resistor across the choke

Papa's Nemesis

[Roscoe Primrose]

Originally Posted by Zen Mod

and you can also play with resistor across the choke

Papa's Nemesis

Which, from an AC standpoint, is the same thing....

Roscoe

[juanitox]

great 5 cents mods generg hope one you can try the choke gate input with a smaller input cap , more expensive but you will never go back

[juanitox]

33 ohm works quite good! wich make near 6ohm output with 8ohm speaker like the original Sit AMP Resistor load version

[generg]

happy you tried it juanitox! I use two 15R Dale 5W in series and thought that´s near optimum.
....of course this all depends on speakers.

and it was of course discussed completely in the other threads of F1, F2 and so on ....
I remembered the words of Chris describing the sound of thick films a bit thin and the sound of V193 a bit to earthy and I thought it is easier to change the V193 sound to thinner than the thick film sound to thicker.......

Again... how does Master Nelson avoid the thinness? at least the Vishay 100W he uses are on a aluminum substrate basis and the thick film 50W I use are on a ....... (?) basis.
So the sound of the 100W may be different from the 50W resistors.
Besides all the differences in the semiconductors and his knowledge around all other components....

bulbs from the UK are coming in 3 weeks and from friend Dan from Canada in about 6 or 7 weeks.....
So I will finally hear The Sound Mike intended to hear us all in the beginning of the thread.......

the bulbs seem to have the right portion of resistance and induction...... (?!)

[generg]

Originally Posted by Zen Mod

and you can also play with resistor across the choke

Papa's Nemesis

thanks Zen Mod I will try, do you think 100R is a good starting point?

[juanitox]

Originally Posted by generg

happy you tried it juanitox! I use two 15R Dale 5W in series and thought that´s near optimum.
....of course this all depends on speakers.

and it was of course discussed completely in the other threads of F1, F2 and so on ....
I remembered the words of Chris describing the sound of thick films a bit thin and the sound of V193 a bit to earthy and I thought it is easier to change the V193 sound to thinner than the thick film sound to thicker.......

Again... how does Master Nelson avoid the thinness? at least the Vishay 100W he uses are on a aluminum substrate basis and the thick film 50W I use are on a ....... (?) basis.
So the sound of the 100W may be different from the 50W resistors.
Besides all the differences in the semiconductors and his knowledge around all other components....

bulbs from the UK are coming in 3 weeks and from friend Dan from Canada in about 6 or 7 weeks.....
So I will finally hear The Sound Mike intended to hear us all in the beginning of the thread.......

the bulbs seem to have the right portion of resistance and induction...... (?!)

master Pass use 40ohm load res , SITamp V1 is 13ohm perhaps some differences here .. the 30ohm on the V193 makes the medium a little more upfront but more important make a bigger 3D image

[generg]

Originally Posted by juanitox

..... the 30ohm on the V193 makes the medium a little more upfront but more important make a bigger 3D image

yes that is true....!

[generg]

and yes he may use 40 Ohm because he wants 10W output and therefore he uses also a 100V supply, all very similar to this De-Lite solution.....
and if you calculate 25V at the drain and 75V for the bulb at 2,2A you have about 35R and that is near to your 40R.
And if you take only 2A you have even 37R5.

And of course I will hear the De-Lite solutions parallel to the SIT just for fun..... and I will even hear an IRF240....!

I am happy that I have so much time and DIYAUDIO PASS FORUM.......

[Zen Mod]

Originally Posted by generg

thanks Zen Mod I will try, do you think 100R is a good starting point?

you already have fave value at secondary side

you can try that value multiplied with squared ratio of xformer

in fact , it will be same thing .............