Let me introduce you to my clone for Zkit1 or SE84CDIY.
![](https://s21.postimg.org/4yrzue06f/20170826_182904.jpg)
![](https://s21.postimg.org/o2g9dm6p3/20170827_181710.jpg)
![](https://s21.postimg.org/46k9y2pnr/20170827_181736.jpg)
![](https://s21.postimg.org/pirrvr9lz/20170827_181811.jpg)
![](https://s21.postimg.org/b5ybxfplz/2f495367-ac1d-4a8b-98a5-a57690b14ce9.jpg)
![](https://s21.postimg.org/9tgmvjs6f/59e57e43-b5f6-4371-9c08-bc4201c84689.jpg)
![](https://s21.postimg.org/vrd3pc76v/95fce835-a6ce-42b2-ad1f-67a4fc906553.jpg)
This amplifier was built based on the schematics available for the ZEN Kit # 1, but I've also added the CCE mod and the bias selector switch from the Select model.
Instead of using the kit's PCB, I preferred to wire it point-to-point using home made turret boards, taking care of separating well the power supply from the audio inputs and outputs stages using a three-star grounding scheme. Connection to the chassis was done by means of a loop breaker circuit, with a 22nF cap (x2 rated) and a 50 Ohms parallel resistor. Since I don't own an original SE84C to compare, I can´t tell how much these changes had contributed but the truth is that it is a very quiet amplifier.
For the power transformer the Edcor XPWR172 was used, which is made for 220 VAC instead of the 240 VAC from the suggested model XPWR066-240.
As for the sound, after 24 hours of operation this thing shows a spectacular performance, with a gian 3D soundstage and incredible dynamism, especially with the bias selector forward (2.7 KOhm).
This amplifier comes to replace my beloved Denon POA-1500 power amplifier (a 150 Watts SS monster) and, to be truth, now I know I don't need more than the 2 Watts this system provides to fluently move my Pioneer HPM-100 speakers (92.5dB), together they make an excellent match and the Improvement in clarity and scene is shocking.
I would like to add that power can be greatly enhanced when using a preamplifier. In my case I use my Denon PRA-1000, which is very transparent and allows me to add those extra decibels to the reproduction of my vinyls.
Finally, I want to especially thanks Steve for making his designs available and for answering my questions here in the forum. This is my first valve power amplifier and it could not have come true without Steve's generosity. Clearly I will go for more soon.
Greetings from Santiago de Chile.