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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
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Old 13th March 2018, 11:47 AM   #1081
irribeo is online now irribeo  Netherlands
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I am interested in which Pmosfet pcgab and Vunce used.
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Old 13th March 2018, 12:30 PM   #1082
xrk971 is offline xrk971  United States
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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
I am guessing Vishay IRFP9240?
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Old 13th March 2018, 12:39 PM   #1083
Vunce is offline Vunce  United States
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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
Quote:
Originally Posted by irribeo View Post
I am interested in which Pmosfet pcgab and Vunce used.
This is what I used:

https://www.mouser.com/ds/2/427/sihfp924-70303.pdf
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Old 13th March 2018, 01:47 PM   #1084
pcgab is offline pcgab  United States
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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
Quote:
Originally Posted by irribeo View Post
I am interested in which Pmosfet pcgab and Vunce used.
I used the usual 9240/240 combo. Matched for vgs between pairs and channels.
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Old 13th March 2018, 01:59 PM   #1085
irribeo is online now irribeo  Netherlands
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Somebody already finished ampboards with Ixys or OnSemi Pmosfets ? For 9240 there have been some treble critique in other amps if I remember correctly ?
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Old 13th March 2018, 02:22 PM   #1086
Juntuin is offline Juntuin  Finland
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Originally Posted by irribeo View Post
Somebody already finished ampboards with Ixys or OnSemi Pmosfets ? For 9240 there have been some treble critique in other amps if I remember correctly ?
One with ixys firing up today..hopefully not literally.
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Old 13th March 2018, 02:39 PM   #1087
xrk971 is offline xrk971  United States
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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
Quote:
Originally Posted by Juntuin View Post
One with ixys firing up today..hopefully not literally.

Good luck! Fingers crossed - but this amp is pretty safe and calm during initial turn on from the examples I have seen.

Interesting to see how the IXYS sounds. Which parts did you get?
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Old 13th March 2018, 03:21 PM   #1088
Juntuin is offline Juntuin  Finland
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Originally Posted by xrk971 View Post
Good luck! Fingers crossed - but this amp is pretty safe and calm during initial turn on from the examples I have seen.

Interesting to see how the IXYS sounds. Which parts did you get?
It seems so measurements seems to be ok, 0.6v across R131 and very little dc on output.

IXTQ36P15P and IXTQ36N30P.

I was wondering that do I have enough pressure on mosfets, since plate that pushes them on copper/heatpipes gets hot like hell very quickly, while heatsinks don't heat up so quickly.
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Old 13th March 2018, 03:59 PM   #1089
xrk971 is offline xrk971  United States
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Are you using silicone heat sink spacers? I do find that torquing the bolts that clamp the MOSFETs down was important. One time I did not do it tight enough and smelled the funny “hot electronics smell” the one before puff of magic smoke occurs. I pulled the power off and discovered a loose bolt.

Tighten the clamps some more is all I can say. The clamps will get hotter because the heat to the sink and heat pipes gets dissipated very efficiently. Whereas the clamp has only slow local conduction. It may be fine. Do you have an iR thermometers? Measure MOSFET package temp.

Ok, hooked up speakers yet?

Another safe and uneventful adjustment-free Class A startup courtesy ALPHA topology.
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Old 13th March 2018, 04:12 PM   #1090
Jazzfan is offline Jazzfan  Canada
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I have a balanced system. Is there any way for me to get in on the fun.
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