Tube-I-zator Professional PCB

[toufu]

Thanks Oliver, I am going to use this as the output for the new Buffalo DAC, will let you know how it goes.

 

[dvb projekt]

I am very curious about this combination

 

[joemana]

Oliver,

If you have the 12AT7 tube in the socket and the switch is set for 6H2P tube, will you damage the tube?

Thanks,

Joe

 

[dvb projekt]

Normaly not, because in this position you have +6,3V at pin 4 and GND at pin 5.
So you would only power up one heater of the double triode.

 

[toufu]

Hi Oliver, I am building this for the new buffalo dac, do you know what the Ri/v should be for this DAC? On the Lampizator page, he mentions that output resistor for ESS DAC was set to 39R, is that the same as the Ri/v? Or is it the Rin resistor he also mentions?

Thanks.

 

[dvb projekt]

I think he mentions the R I/V because he spoke from "loading the output by resistor 39 Ohms to pull the output to current mode".

 

[toufu]

I think he mentions the R I/V because he spoke from "loading the output by resistor 39 Ohms to pull the output to current mode".

Danka!

 

[toufu]

Has anyone found another transformer source? Hate to pay $25 shipping for a $23 product!

I got my transformer from Antek-Inc, just call them and tell them you want the 9v winding instead of the 6v. It's 5$ extra.

 

[jean-paul]

When reading this thread I saw the odd relays in the schematic and I thought I knew those. It happens that I have exactly that type in stock. They are 5 Euro/piece.

 

[jean-paul]

Sorry, it appears only the 12V version is still in stock. No 5V versions left.

 

[toufu]

Hi Oliver, I noticed you are using Wago Terminals for this and the Lightspeed board, how do you insert the wire into the terminal? Do you need to buy the Wago tool to get it working?

By the way, here is a cheap source for the terminals:

http://cgi.ebay.com/socket-receptac...emQQptZLH_DefaultDomain_0?hash=item5884298fd6

 

[dvb projekt]

Hi Oliver, I noticed you are using Wago Terminals for this and the Lightspeed board, how do you insert the wire into the terminal? Do you need to buy the Wago tool to get it working?

By the way, here is a cheap source for the terminals:

socket receptacle connectors wago 236 4 pin,wd3,3a 10 p - eBay (item 380174438358 end time Apr-02-10 19:46:32 PDT)

Hi toufu,

with the wago tool it is much easier but you could also use a small screwdriver.

Therefor you must push inside the back hole of the terminal to lift the internal contact.

Best regards,
Oliver

 

[toufu]

Thanks for all the help, Oliver! I got my board working with the buffalo 2 DAC. Sounds great, very liquid, clear and nice 3D soundstage.

One thing though, I couldn't get it to work with 6922 tubes, just the 12AX7, but even with the 12AX7 I had to make sure the switch is open. Not sure why, can you comment on that?

An externally hosted image should be here but it was not working when we last tested it.

 

[dvb projekt]

Thanks for all the help, Oliver! I got my board working with the buffalo 2 DAC. Sounds great, very liquid, clear and nice 3D soundstage.

One thing though, I couldn't get it to work with 6922 tubes, just the 12AX7, but even with the 12AX7 I had to make sure the switch is open. Not sure why, can you comment on that?

An externally hosted image should be here but it was not working when we last tested it.

Hi toufu,

sure i can
The silkscreen legend is designed for a switch.
On the 12AX7 position the contacts for the heaterswitch are open and on the 6N2P position closed!

So with the 6922 the contacts must be opened.

Witch problems do you have with the 6922?


Oliver

 

[dvb projekt]

So with the 6922 the contacts must be opened.

I must correct myself!!!

I took a look in the data of the 6922. It has the same pinout as the 6N2P, so
the contacts of the heaterswitch must be closed.

BTW, give the 6N2P-ER a try. They will outperform the 6922 in every aspect.

 

[toufu]

Hi Oliver, I don't have any switches of that size, so I got 12AX7 to work by not having any jumper across the three pins. Is that correct? I couldn't get it to work with 12AX7 by having a jumper across the two pins that says '12AX7'.

By the way, can I get 12AT7 or 12AU7's to work without changing the Rk resistor? It's set to 200R right now.

 

[dvb projekt]

This is correct.

About the Rk value for the 12AT7 or 12TU7 i have no experiences.

Perhaps you could post this question at the http://www.diyaudio.com/forums/tubes-valves/156529-tube-i-zator-srpp-dac-i-v-stage-circuit-discussions.html thread.

 

[toufu]

Thanks Oliver for the board, I am going to have a lot of fun trying different tubes. I just bought some 6N1P-EV, 6N2P-EV and 6N6P-i tubes from Ebay.

 

[dvb projekt]

I´m looking forward to your experiences!

 

[Koifarm]

You can calculate the right resistorvalue for the used tube and output impedance with this sheet.

http://www.ict-net.net/tube.xls

Ronny