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Lateral Mosfets Double Die TO-3 ESP P101
Lateral Mosfets Double Die TO-3 ESP P101
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Old 13th September 2018, 07:52 PM   #11
fab is online now fab  Canada
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Lateral Mosfets Double Die TO-3 ESP P101
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Originally Posted by a1095us View Post
Thanks for the input... all! No need to drag this out. I've decided to order the TO-3 double die versions and the P101 boards form Rod.
This will replace an aging, but going strong, Bryston 3BST. Hope it sounds as good or better. Will report back when project completed.
Do not forget to reduce by half the value of the gate resistors (to have the same bandwidth as original ESP P101) since you have double die mosfet thus twice the input capacitance.
Also? Having built the P101 amp before and the slew rate is not as advertised but much slower - if it is important for you. This was confirmed by Elliott when communicating with him.
Good luck in your project.
Fab
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Old 13th September 2018, 08:22 PM   #12
nigelwright7557 is offline nigelwright7557  United Kingdom
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Lateral mosfets are just silly money now, that's if you can find any.
I think profusion was the only company still selling none fake parts.

I have built both lateral and vertical mosfet amps and cant tell the difference in sound.
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Old 13th September 2018, 09:25 PM   #13
a1095us is offline a1095us  United States
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FAB
"Do not forget to reduce by half the value of the gate resistors (to have the same bandwidth as original ESP P101) since you have double die mosfet thus twice the input capacitance."

I'll bring this up with Rod and see if he agrees with your suggestion. Unless there is some documentation from his sight on this topic. Thank you.

nigelwright7557
"Lateral mosfets are just silly money now, that's if you can find any.
I think profusion was the only company still selling none fake parts."

In the grand scheme of this project, I don't think that these Profusion TO-3 parts are that expensive considering the cost of 4 per channel and the over-all cost of everything.
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Old 14th September 2018, 04:54 AM   #14
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by a1095us View Post
FAB


In the grand scheme of this project, I don't think that these Profusion TO-3 parts are that expensive considering the cost of 4 per channel and the over-all cost of everything.
I was finding after p+p they were about 20 each at Profusion.
You can get a lot of irfp240/9240 for that money and still get a great sounding amp.
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Old 14th September 2018, 02:58 PM   #15
a1095us is offline a1095us  United States
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Quote:
Originally Posted by nigelwright7557 View Post
I was finding after p+p they were about 20 each at Profusion.
You can get a lot of irfp240/9240 for that money and still get a great sounding amp.
I'm sure there is value there but not compatible with the ESP P101.
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Old 14th September 2018, 03:01 PM   #16
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by a1095us View Post
I'm sure there is value there but not compatible with the ESP P101.
The verticals need a different bias circuit to the laterals.
The laterals usually use a 1K pot but the verticals need a proper Vgs multiplier.
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Old 17th September 2018, 04:22 AM   #17
Ian Finch is offline Ian Finch  Australia
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As I understand, the OP wants to use TO3 parts because the chassis already has provision for mounting them. That makes sense, rather than hacking the heatsink about, unless absolutely necessary.

The problem is that whilst Lateral mosfets are a sure-fire and simply applied device, the metal can varieties are close to un-obtanium presently. There was yet another thread here only week or so ago, moaning about general scarcity of lateral mosfets - check the recent threads if interested in the suggestions but I don't think you'll find much stock of genuine TO3 parts presently, let alone the double-die varieties.
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Old 17th September 2018, 05:17 AM   #18
EssB is offline EssB  United Kingdom
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Lateral MOSFETs | Profusion
Exicon T0-3 types in stock (not many), new, genuine and you can have them tomorrow. Nigel is right the double dies versions will be about 20 each after tax & delivery.
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Old 17th September 2018, 11:42 AM   #19
ivanlukic is offline ivanlukic  Serbia
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Rod's boards are for two pairs of TO3P latfets (flatpack plastic types), not for TO3! Here is the pic of my ESP P101 build.
Attached Images
File Type: jpg P101 0003.JPG (116.0 KB, 229 views)
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Old 17th September 2018, 04:20 PM   #20
a1095us is offline a1095us  United States
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Default TO-3

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Originally Posted by ivanlukic View Post
Rod's boards are for two pairs of TO3P latfets (flatpack plastic types), not for TO3! Here is the pic of my ESP P101 build.
Simple! The P101 boards will be hard wired to the TO-3 circuit boards.

Just like the Tandberg amp was wired to the outputs.

Built similar and works!
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