INT-25 Power supply

[celestialsound]

Hello folks.
Does anyone know how much VA (watts) is the power supply equipped into the INT-25 integrated amplifier.
Seems like I can't find information in the user manual. I'm just curious, nothing serious 🙂

 

[Zen Mod]

XA25 Donut - eyeball - no less than 500VA

 

[celestialsound]

That's hilarious 🙂 and how much Reservoir capacity (µF) ?

 

[Zen Mod]

well, one of iterations is having exactly 18pcs of 10mF/50V snap-ins

 

[Andersonix]

upskirt pics confirm:
http://6moons.com/audioreviews2/passlabs3/2.html

 

[Zen Mod]

see, entire Internet abides to Mighty ZM

 

[Extreme_Boky]

I just neatened up the photo a bit... a lot of things can be learned from this one.

 

[Nelson Pass]

Ah yes. Those are my boards...

 

[Zen Mod]

early morning at SR, laughing at Boyz with first coffee

 

[codyt]

I’m always humbled by the size of that thermistor. MS35 20010, for those interested

 

[enochRoot]

I never realized you used hockey pucks in any of your production amps!

 

[Nelson Pass]

At the moment it's the only one.

And yes, I drink a cup of coffee in the morning while I peruse the forums at diyAudio to see what mischief the Greedy Boyz are up to.

 

[wayne]

The integrated uses a different power supply. Everything is on a single board, rectifiers and inrush limiting and a second small transformer to keep the standby circuitry running. This is now currently used in both units.

 

[enochRoot]

At the moment it's the only one.

And yes, I drink a cup of coffee in the morning while I peruse the forums at diyAudio to see what mischief the Greedy Boyz are up to.

I mean...not that it matters, but they look so cool to me! Love those chunky cases with the screws! Nice to see them in a commercial product!

 

[CoGT3]

At the moment it's the only one.

And yes, I drink a cup of coffee in the morning while I peruse the forums at diyAudio to see what mischief the Greedy Boyz are up to.

👆

One could infer from that statement that we may see more PL amplifiers using the Hockey Pucks. Makes one ponder what a balanced Hockey puck amp without degeneration would look like (replacement for XA30.8?!?!).

 

[Extreme_Boky]

early morning at SR, laughing at Boyz with first coffee

Why would Nelson laugh at us??

I don't understand your comment...
Nelson does not strike me as a person who would do that.

 

[celestialsound]

@Nelson Pass & @wayne Thank you for creating such a perfection. This "little" INT-25 have some magic in it, you just can't simply stop listening to music. ..

 

[Extreme_Boky]

Both are XA25. However, one seems to be an earlier version, with no PCB for MOSFETs and a single high-power resistor vs. paralleled 5W Panasonics. The toroid shielding seems to differ as well.

Any other differences? Which one is a later version, and how can one be sure to get the later version? Would the serial numbers tell? If YES, how?

 

[JSA1971]

Both are XA25. However, one seems to be an earlier version, with no PCB for MOSFETs and a single high-power resistor vs. paralleled 5W Panasonics. The toroid shielding seems to differ as well.

Any other differences? Which one is a later version, and how can one be sure to get the later version? Would the serial numbers tell? If YES, how?

View attachment 1102132

View attachment 1102130

The bottom pic upper board says R2, possibly meaning revision 2 compared to R1 on the top pic, on the bottom right corner (printing is upside down). Maybe this one is the “newer” iteration

 

[Extreme_Boky]

Yes, I noticed that - thanks. I am trying to find if there's a way to ensure that if someone is to buy an XA25 🙂, what would be the question(s) to ask, to ensure the latest version is received?