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Old 16th May 2011, 08:52 PM   #1
hitman1 is offline hitman1  Turkey
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Default cadence amp

hello . my english bad .

ı have cadence a2000+ zed audio

this amp is work . no problem
but I want change output transistors . because

channel 1 output fet 2x buz103
ch 2 output fet 1x buz103 1x irf540
ch 3 output fet 2x irf640
ch 4 output fet 2x irf640

what is the original output fet this amp ? buz103 buz11 ?
orijinal output fets brand motorola ?
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Old 16th May 2011, 09:20 PM   #2
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I don't know what the originals are but if you look at the solder connections for the transistors, it's often easy to determine which were flow soldered (original) and which were soldered with a regular soldering iron.
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Old 17th May 2011, 02:13 PM   #3
hitman1 is offline hitman1  Turkey
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amplifier board photos .
ı can't find buz103 or buz11 .
what I use transistors ? maybe irf540 ? irf640 ?


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Old 17th May 2011, 06:47 PM   #4
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What's the voltage rating on the 4 capacitors near C10?
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Old 18th May 2011, 12:49 PM   #5
Dr Zeus is offline Dr Zeus  United States
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This amp is interesting to me. It sure is a Zed Audio built amp but doesnt actually say Zed audio. i can tell by all the proprietary NW and PROT circuits. Interesting since I've seen a few Maxxonics brand Cadence amps; this one is not like ones ive seen.

As for BUZ11/103, I'm sure Perry would be the difinitive source for an alternative. I've seem similar parts in RF amps which use Buz11/103 a year or generation before RF switched to IRFx40/9x40.

What are you seeing for rail voltage?

Last edited by Dr Zeus; 18th May 2011 at 12:52 PM.
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Old 18th May 2011, 06:24 PM   #6
hitman1 is offline hitman1  Turkey
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thanks for reply
I am novice . ı have a multimeter . dc voltage test
dc voltage rating 4 capacitors near -0.65
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Old 18th May 2011, 09:41 PM   #7
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What's the DC voltage rating printed on the side of the capacitor?
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Old 18th May 2011, 10:02 PM   #8
hitman1 is offline hitman1  Turkey
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ı want to say my amp is already working.. that's 8 transistor are different model . ı am thinking if ı change transistor (all of them same models transistor or high quality with compatible transistors )

maybe it's gives to high quality sound .

what is your opinion about my mind ?
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Old 18th May 2011, 10:53 PM   #9
ppia600 is offline ppia600  United States
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I would think all eight outputs are the same model and most likely the irf640 but could be wrong. Depends on the drive transistors, maybe Perry would have better insight on that.
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Old 19th May 2011, 06:33 AM   #10
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That's why I asked for the voltage rating on the caps. That would tell us what the maximum voltage on the outputs would be.
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