Hmmm, I am now confusing myself. Just to make absolutely sure (so that an idiot like me can understand it) I am using only the positive terminals of each phase. So the connections from one DAC to the tube-i-zator are as follows?
positive anti-phase out - -> - >- - + input right (tube-i-zator) and ultimately to pin 3 of XLR balanced output
positive phase out - -> - >- -> - - + input left (tube-i-zator) and ultimately to pin 2 of XLR balanced output
GND > GND to pin 1 XLR
I ignore all negative output connections on DAC.
Thank you for your help. I think the wine I had last night is still affecting my brain ;-)
positive anti-phase out - -> - >- - + input right (tube-i-zator) and ultimately to pin 3 of XLR balanced output
positive phase out - -> - >- -> - - + input left (tube-i-zator) and ultimately to pin 2 of XLR balanced output
GND > GND to pin 1 XLR
I ignore all negative output connections on DAC.
Thank you for your help. I think the wine I had last night is still affecting my brain ;-)
You cannot use the schematic for IVY III or Legato 3 since the way the BII or BIIISE differential pairs are done. As you can see there's two differential pairs, one on each side and that would require the use of 4 Tube-I-Zator if doing it this way...
You need to use only the positive on each side and they are reversed/mirrorred on each side.
So your connection is correct the way you wrote it but the second BIIISE "+ phases" have to be reversed on the Tube-I-Zator as per my drawing.
Please make sure you also read the integration guide since you need to setup the BIISE in dual mono. Keep the DAC as close as each others as possible since you need to connect them together.
I had a dual mono setup exactly like yours using dual Tube-I-Zator but ended up using a single BII with two Tube-I-Zator since you can't hear the difference with the tube output. Basically you lose the advantage to run it in current mode due to cable length, etc, so a single DAC is sufficient. And it sounds really good. Really love it!
Ciao!
Do
Last edited:
Thanks for the explanation. I had everything working from a board setup perspective. I was just confusing myself with all the different wiring options. Just for the sake of completeness, why is using the 'positive anti phase' and 'positive' outs any different from just using the +\- connections from the in-phase side of the board?
Hi Bjarne,
the Tube-I-zator values of the SRPP stage based on Lukas Fikus recommendations with the 6N2P.
Because of the awesome sound results, i had no motive to play with these.
Best regards,
Oliver
Hi Bjarne,
240VDC will provide more linearity, but you need to recalculate Rk, because with same Rk value (as for 150VDC) and increased to 240VDC power supply voltage you possibly will shorten life of the tube without any reason.
And vice versa - with Rk calculated for 240VDC and real use of 150VDC you will unreasonably decrease standing current of SRPP, which is better to have higher if possible.
For 150VDC and 12AX7 tube please look post No.815, in attachement you will find necessary data.
It is still on the MDF. I am waiting to Ian´s new I2S-PCM driver board. After integrating this, i will build the case.
I will find a way to get all parts in a case
All needed voltages goes through the military connector HERE.
Hi Lil,
the next batch will correct the two small bugs, but it´s really no big thing.
In principal you could use also the 6H30, but i haven´t any recommended B+, Rk & R I/V values for this tube.
Bargain Sale
Here you could order my ready build Tube-I-zator test module
(excl. Tubes, Rk & R I/V)
Main Parts
- Nichicon KX Series caps (HV-PSU)
- Panasonic FM Series caps (Heater PSU)
- Mundorf MCap EVO aluminium/oil 2.2µF output caps
- Fairchild ISL9R460PF2 Stealth rectifier diodes
for the special price of
$99
including
Worldwide shipping and paypal fee
An externally hosted image should be here but it was not working when we last tested it.
If you are interested, please send me a PM.
Sold!
Q. I want to incorporate SSHV. My voltages are 290v rectified to C-R-C. R=6.6k. When I add heater supply to tubes I get 284v before 6.6k and 222v after on anode. C=120u 400v for both. when the heaters turn off the voltage goes 290v. Iam thinking I can add higher resistor for C maybe 12k or so to bring V down to 170ish. I see an initial spike of 264v on power up as the tubes warm up gradually dropping down to 222v after 4-5 seconds. How dose this sound. My concern is the initial V spike at power up. THX
Hi Jorge,
if you use the SSHV for B+ i strongly recommend to inject the 2mA bias current (SSHV out 150V --> 75K0 --> R I/V), because we get a high quality CCS here!
It takes 5 min. and you will get the max. performance out of the TDA1541A.
Cheers,
Oliver
Thanks Oliver...
I will do it ASAP!!
Thanks!!
Jorge
Hi Jorge,
if you use the SSHV for B+ i strongly recommend to inject the 2mA bias current (SSHV out 150V --> 75K0 --> R I/V), because we get a high quality CCS here!
It takes 5 min. and you will get the max. performance out of the TDA1541A.
Cheers,
Oliver
I will do it ASAP!!
Thanks!!
Jorge
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.