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caraudioguy2100 2nd December 2019 10:09 PM

Audio Art 260.6XE
 
1 Attachment(s)
Anyone know what power supply fets I can use in this amp .

It came to me with them removed .

Perry Babin 2nd December 2019 10:18 PM

What are they using for a drive circuit?

caraudioguy2100 2nd December 2019 10:22 PM

22ohm gate resistors
TL494CN
A733 and C945 as the drivers

Perry Babin 2nd December 2019 10:29 PM

If they're using an EF pair for drivers, you can use most anything. The IRF3205s are a common sub. If all of the 22 ohm gate resistors are within tolerance. If you need to replace one or more, use 47 ohm for all of the gate resistors.

caraudioguy2100 10th December 2019 05:09 AM

Is there a good replacement for the A733 and C945 transistors they are being used as drivers in the power supply

Perry Babin 10th December 2019 05:13 AM

BD139/140

caraudioguy2100 10th December 2019 05:34 AM

Would the A1023 and C1027 work as well ?

I have no 139/140ís left have to order some .

Also if I use the Z44Nís as the power supply fets will the 47 ohm resistors be ok or should I switch the back to 22 ohm

Perry Babin 10th December 2019 05:42 AM

I've never seen a drive circuit where the Z44s need anything lower than 47 ohm.

The 1023/1027 will work.

caraudioguy2100 10th December 2019 06:44 AM

Replaced the driver transistors and the amp still draws excessive current .

The power supply fets get red hot within 2 secs

Perry Babin 10th December 2019 07:01 AM

Did you check the drive signals before installing the FETs?

Does it do the same with the rectifiers removed?

If the FETs are clamped to the heatsink and you power through a limiter, does twisting the transformer make a difference?


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