L'Amp: A simple SIT Amp

[generg]

Originally Posted by Michael Rothacher

I've considered getting an Ohm's Law Wheel tattoo.

would be my first tattoo....

no bleeders, Mike

3,3k like in F3? or still more? 5W

[Michael Rothacher]

3.3K is fine for bleeders. You have a wide choice there.

[nicoch58]

Zen Mod

[juanitox]

a bleeder ? don't see it on the Fig. is it needed ? across C1 or C2 ?

[generg]

VICTORY.......humfree, Yippee.....

that means that it is no good idea to use the FW PSU with the symmetric voltages....

I made it point to point my ...........most favorite way!

I enclosed a bit a reluctant a picture, please do not forget this case has seen during the last two years

F5 mono PSU, dual PSU, F4, BA-1, BA-2, BA-1 with Semisouth, F1J, F2J,F3, Aleph3, Aleph30, Aleph5,BJ2, M2clone (crippled F4 with different xformers), xformers with 2x18V 300W, 2x30V 400W,2x18V 500W.........SIT

so you understand it is a bit dirty and worn, but it served me well..... and now you understand better my signature....

I THANK YOU ALL!

[ra7]

but you didn't say how you became hum free.

[Michael Rothacher]

Originally Posted by juanitox

a bleeder ? don't see it on the Fig. is it needed ? across C1 or C2 ?

If you intend to energize the power supply while not connected to the amp (e.g. for testing), you want a resistor from the output terminal of the supply to ground to discharge the capacitors for your safety.

[generg]

Oh, O.k. ra7, I build it like Mike suggested.... non-symmetric.

[Michael Rothacher]

Originally Posted by generg

VICTORY.......humfree, Yippee.

Awesome

[Chris Goldring]

Hope everyone have a great time, i certainly do!

The prototype amp is now done and works very fine indeed.. I'm running it at 32V and about 1.6-1.7a (each channel), i think the heat sinks are good enough for that as they "only" get to about ~50C..And the resistors? a whopping ~150C at current power

The sound is awesome, the sweetness, the speed, the NUANCES, the big SPACE between the notes are just nothing but amazing.. It's just that, the timeless and sweet feeling and almost infinite space between the notes Is sure has that "sitting up all night" quality to it too. I can't wait to get some more proper cooling and push the power a little..

A tip might be to use a BJT based cap-multiplier in the PSU, just a thought.. I use it total hum-free with a total of 15,000uF for both channels as i don't like amps running something like 80,000uF+ (sounds slow with dull nuances if you ask me)