Krell KSA 100mkII Clone

[Erlend Sæterdal]

Working on Ksa 100 Mk 2 Clon. Enclosure 35 Kg. Front 10.5 Kg.

 

[danieljw]

View attachment 736926

View attachment 736927

Working on Ksa 100 Mk 2 Clon. Enclosure 35 Kg. Front 10.5 Kg.

Can't wait to see this one!

 

[danieljw]

bit of progress on this one...

 

[danieljw]

Output stage starting to come together

 

[neychi]

Daniel, you did a good job but I'm afraid these heatsinks will not be big enough for 100W class A.

 

[Erlend Sæterdal]

Daniel, you did a good job but I'm afraid these heatsinks will not be big enough for 100W class A.

Max 40

 

[Erlend Sæterdal]

Can't wait to see this one!

Adjusted but have to finish installation off softstart and the security at output. Draws 600 W from mains. 0.775 ma trough each off 3 set transistors.

 

[danieljw]

Max 40

Hi There,

This is only one channel
(I did the calculations.)

Do youy think it is still not enough? The Math says it will be ok

 

[Erlend Sæterdal]

Hi There,

This is only one channel
(I did the calculations.)

Do youy think it is still not enough? The Math says it will be ok

Sorry then I thought it was stereo

 

[danieljw]

Sorry then I thought it was stereo

Al good man, I should have posted this

 

[neychi]

In that case, that will be enough

 

[danieljw]

In that case, that will be enough

How is yours going?

 

[Erlend Sæterdal]

Follows

 

[neychi]

How is yours going?

My amps (ksa50) working for years now

 

[danieljw]

My amps (ksa50) working for years now

Good to hear

Some more progress

 

[Erlend Sæterdal]

Very powerfull and good sound.

 

[danieljw]

View attachment 739221

Very powerfull and good sound.

Really nice case!

 

[Erlend Sæterdal]

Thanks

 

[danieljw]

hi.
my amp is now up and running.
i had to change the capacitor from 20pF to 5pF over the feedback resistor.
now everything is working properly.
i reduced the bias to 0,25mA (=4A). makes about 80W class A.
thank you for this great amplifier. sounds great.

regards
s.

Hi Slavko,

I am having a similar issue....
With 7.5k and a 5k pot I have 0.6V to 1.7V.
With 10k and a 5k pot I have 0.9 V to over 2V
With 20k and 5k pot I can drive 5V to the base of the output stage but I still am not seeing any voltage drop on the 1Ohm resistors....

Any tips?

-Dan

 

[2SA991]

Krell KMA 100

Hello
I need some 1N5309 t repair my Krell KMA 100 first generation.
I live in Germany.

Regards
Piet