Zen V4 - Part replacements?

Tazzy · 25th September 2002, 02:43 PM

At the moment I'm collecting parts for a set of Zen V4's.

Thanx to some forum members (Thanx again!) I've collected nearly all the parts.

Which IRFP044 should I replace with a IRFP240? At the moment I'm stuck at 2 for each channel. My guess is Q5?

Can I replace the ZVP3310A with a ZVP2120A? It has nearly the same specs (high drain-source voltage and higher Rds(on))?

Karen · 25th September 2002, 03:24 PM

That would be Q2 and/or Q5. Q1 is the gain device and should be an 044, for sure.

Tazzy · 25th September 2002, 04:11 PM

This setup should work?

Q1 = IRFP044
Q2 = IRFP044
Q3 = ZTX450
Q4 = ZVP2120 -> ?????
Q5 = IRFP240 -> no problem

stadams · 27th September 2002, 02:15 PM

Tazzy,

In using the ZVP2120A, you are doubling the input capacitance for the input stage. This will increase high frequency non-linearity due to the additional capacitance which inturn increases high frequency distortion. This was addressed in Mr. Pass' Zen v.4 article when he discussed the design of the follower input and the transistor selection for that stage.

Also, the output characteristics are substantially different. You can use the ZVP2120A and the amplifier will perform better than without the follower (i.e. Zen v.3). Try out the ZVP2120A and see how it performs. The pinout is the same as the ZVP3310A, so if you are disappointed by your selection, you could easily replace it with the ZVP3310A.

Good Luck,

Stabist · 29th September 2002, 07:51 PM

In my v4 all 6 IRFP044 are substituted with IRFP250N - they were the only available mosfets at that moment; for all others I should wait for at least 20days ...
And it works ...

skaara · 29th September 2002, 08:58 PM

but with irfp044 it would sound even better

Stabist · 29th September 2002, 09:20 PM

Skaara - I'm more than aware of that - but Kirc and I had some strange decision to build an amp in 3 days - and that was the only way to do it ...
If we would be a bit more patient - 044s would be the righ ones ...

25th September 2002, 02:43 PM	#1
Tazzy diyAudio Member Join Date: Jul 2002 Location: Netherlands	Zen V4 - Part replacements? At the moment I'm collecting parts for a set of Zen V4's. Thanx to some forum members (Thanx again!) I've collected nearly all the parts. Which IRFP044 should I replace with a IRFP240? At the moment I'm stuck at 2 for each channel. My guess is Q5? Can I replace the ZVP3310A with a ZVP2120A? It has nearly the same specs (high drain-source voltage and higher Rds(on))?

25th September 2002, 03:24 PM	#2
Karen diyAudio Member Join Date: Sep 2001 Location: Foresthill, CA	That would be Q2 and/or Q5. Q1 is the gain device and should be an 044, for sure. __________________ ..K

27th September 2002, 02:15 PM	#4
stadams diyAudio Member Join Date: Mar 2002 Location: South MS	ZVP2120A? Tazzy, In using the ZVP2120A, you are doubling the input capacitance for the input stage. This will increase high frequency non-linearity due to the additional capacitance which inturn increases high frequency distortion. This was addressed in Mr. Pass' Zen v.4 article when he discussed the design of the follower input and the transistor selection for that stage. Also, the output characteristics are substantially different. You can use the ZVP2120A and the amplifier will perform better than without the follower (i.e. Zen v.3). Try out the ZVP2120A and see how it performs. The pinout is the same as the ZVP3310A, so if you are disappointed by your selection, you could easily replace it with the ZVP3310A. Good Luck, __________________ -Todd

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25th September 2002, 04:11 PM	#3
Tazzy diyAudio Member Join Date: Jul 2002 Location: Netherlands	This setup should work? Q1 = IRFP044 Q2 = IRFP044 Q3 = ZTX450 Q4 = ZVP2120 -> ????? Q5 = IRFP240 -> no problem

29th September 2002, 07:51 PM	#5
Stabist diyAudio Member Join Date: Sep 2002 Location: Slovenia	In my v4 all 6 IRFP044 are substituted with IRFP250N - they were the only available mosfets at that moment; for all others I should wait for at least 20days ... And it works ...

29th September 2002, 08:58 PM	#6
skaara diyAudio Member Join Date: Jun 2002 Location: Europe, Slovenia	but with irfp044 it would sound even better

29th September 2002, 09:20 PM	#7
Stabist diyAudio Member Join Date: Sep 2002 Location: Slovenia	Skaara - I'm more than aware of that - but Kirc and I had some strange decision to build an amp in 3 days - and that was the only way to do it ... If we would be a bit more patient - 044s would be the righ ones ...

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