Stolen Trademark Amplifier from Jim's Audio on EBAY

[MEGA_amp]

Congrats!! Any chance you can take a hi-res pic of the main board please

 

[Bonanza]

I'll post it when I get back from vacation in early January.

 

[dacen]

Be aware. I have been a victim of fake 2sc2240 for a long time now. Problem solved as soon as I implemented a pair that I knew were the originals.

 

[Dave murrey]

Well, I spent yesterday afternoon in listening and I must say that I'm impressed with the sound. Sound stage is huge. I think that the sound is even better than my first KSA50. Maybe, the reason is higher rail voltage. Bias is set at 325mV/0,5ohm. After two hours heatsinks are warm but not hot

Hi neychi what voltage did you use for this please.

 

[neychi]

Hi neychi what voltage did you use for this please.

+/- 48V loaded

 

[Dave murrey]

+/- 48V loaded

Thank you

 

[danieljw]

Finally finished both amps.

Very happy with the outcome!

Hi Bonanza,

Are these cases from the diyaudio store? How do you like them

-Dan

 

[Bonanza]

No, I had them custom made..

 

[danieljw]

No, I had them custom made..

Nice work any how.

 

[Blitz]

Did you use any speaker protection boards ? Which ones ?

 

[dacen]

At last. Enough for convection cooling. Works well, full bias. Modified with to ekstra output transistors on each half period. Twelve on each channel. Added ekstra driver for each pair. Biased to 0.4 A on each transistor = 2.4 A. The heat transfer to the heatsink improved dramatically with 2mm aluminium oxide insulators plus thermal paste on both sides. The transistors conduct much more evenly. Measure almost the same voltage over each emitter resistor. Way better than the Silpads.

 

[dacen]

Modified with two extra drivers:

 

[danieljw]

How do you find the sound?

 

[dacen]

For driving a pair of DIY Apogee Sign. like speakers it is exactly what I have been searching for. It has the power and control for driving low efficiency speakers. Using it for only driving the bass panel.

 

[firestorm]

Can someone share the BOM you've used for your Jims Audio KSA50 pcb?

Looking to rebuild my original KSA50 ...

 

[konst]

Hey there guys, can you post the latest BOM plz, I am trying to build these and the 2scX are no longer available (plus some others). any suggestions much appreciated.