Penultimate Zen Hybrid

kristijan-k · 29th December 2002, 10:55 PM

Hello,

Here is one little different idea for the ZVP3310 subtitution - with
the E88CC/ECC88/6DJ8/6922 Valve.
I did not yet test this modified circuit, but as soon as
I found some time, I will give it a try and see how it will work.

Any comments or suggestions ?

Best regards,
Kristijan Kljucaric
http://web.vip.hr/pcb-design.vip

Bricolo · 29th December 2002, 11:01 PM

it would need 2 transformers

but it could sound great

PS: what's wrong with the ZVP3310?

stan_nesta · 29th December 2002, 11:08 PM

Kristijan,

I think in order to use e88cc as a buffer you should arrange it as a follower, that is the output is taken from the cathode, therefore no gain, no Miller capacitance, etc.

Regards

Stan

kristijan-k · 29th December 2002, 11:08 PM

Hello,

The two transformers are not a problem.
Also, the 50 V voltage from the unregulated
power supply can be tripled with the capacitors/diodes
to the 150 V or so.

Nothing wrong with the ZVP 3310, but the Zen with
the Valve would probably sound much different.

Best regards,
Kristijan Kljucaric
http://web.vip.hr/pcb-design.vip

djk · 29th December 2002, 11:42 PM

Almost 50dB of gain with an input impedance of 820 ohms?

kristijan-k · 30th December 2002, 01:21 PM

... or maybe something like this, with balanced inputs ?

tschrama · 30th December 2002, 02:17 PM

I like the idea, but I don't understand your schamtics. Are you shure you didn't make an error?

gr,
Thijs

Tazzy · 30th December 2002, 05:40 PM

Whow... Zen "Lite" Penultimate.

Kristijan, since I can't find ZVP3310's a change in this direction might be a pretty cool option.

Let me know how thinks work out and how a valve sounds nice
in this setup. I might want to buy a pair of PCB's from you.

Tazzy · 1st January 2003, 11:20 AM

Quote:

Originally posted by kristijan-k
The two transformers are not a problem.
Also, the 50 V voltage from the unregulated
power supply can be tripled with the capacitors/diodes
to the 150 V or so.

That would be nice, the torroids I bought (by mistake) for my zenv4's are 35-0-35 @ 300VA Amplimo's Torroid.

I was planning to use them as 35-0 @ 600VA.
Another option would be to use one secondairy for the valve(s) and the other for the "Zen".

kristijan-k · 1st January 2003, 08:24 PM

Hello,

Thanks for the response.

I will try to build the Zen-4 with tube on several ways,
and see how it would work.

I ordered the 6DJ8 tubes, together with the other ones
for the OTL that is on my website, and when they arrive
we will see if this is a good way to go.

Anyone know for the good program that can simulate
this kind of circuit ?

Best regards,
Kristijan Kljucaric
http://web.vip.hr/pcb-design.vip

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29th December 2002, 11:01 PM	#2
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	it would need 2 transformers but it could sound great PS: what's wrong with the ZVP3310?

29th December 2002, 11:08 PM	#3
stan_nesta diyAudio Member Join Date: Dec 2002 Location: South Australia	Kristijan, I think in order to use e88cc as a buffer you should arrange it as a follower, that is the output is taken from the cathode, therefore no gain, no Miller capacitance, etc. Regards Stan

29th December 2002, 11:08 PM	#4
kristijan-k diyAudio Member Join Date: Mar 2002 Location: CROATIA	Hello, The two transformers are not a problem. Also, the 50 V voltage from the unregulated power supply can be tripled with the capacitors/diodes to the 150 V or so. Nothing wrong with the ZVP 3310, but the Zen with the Valve would probably sound much different. Best regards, Kristijan Kljucaric http://web.vip.hr/pcb-design.vip

29th December 2002, 11:42 PM	#5
djk diyAudio Member Join Date: Feb 2001 Location: USA	Almost 50dB of gain with an input impedance of 820 ohms?

30th December 2002, 02:17 PM	#7
tschrama diyAudio Member Join Date: Jul 2001 Location: The Netherlands	I like the idea, but I don't understand your schamtics. Are you shure you didn't make an error? gr, Thijs

30th December 2002, 05:40 PM	#8
Tazzy diyAudio Member Join Date: Jul 2002 Location: Netherlands	Whow... Zen "Lite" Penultimate. Kristijan, since I can't find ZVP3310's a change in this direction might be a pretty cool option. Let me know how thinks work out and how a valve sounds nice in this setup. I might want to buy a pair of PCB's from you.

1st January 2003, 08:24 PM	#10
kristijan-k diyAudio Member Join Date: Mar 2002 Location: CROATIA	Hello, Thanks for the response. I will try to build the Zen-4 with tube on several ways, and see how it would work. I ordered the 6DJ8 tubes, together with the other ones for the OTL that is on my website, and when they arrive we will see if this is a good way to go. Anyone know for the good program that can simulate this kind of circuit ? Best regards, Kristijan Kljucaric http://web.vip.hr/pcb-design.vip

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