BIII with Broskie Unbalancer vs. EE Minimax Plus - My experience - Page 2 - diyAudio
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Old 18th February 2013, 07:35 PM   #11
Rolle is offline Rolle  Denmark
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Quote:
Originally Posted by Blitz View Post
I did not a big swapping contest there yet. Currently I use a TAD. Which is surprisingly good. But I need to revisit this as the whole character of the Unbalancer changed dramatically due to the other parts changes.

To give you an exapmple: I thought that I need to intregrate a stronger L-Pad before the tweeter when using the V-cap, as is was to treble-biased. Now with the Duelunds, you nearly would say: NOt necessary anymore...plus getting MORE transparency. Sound a bit weird, but they are much faster and better than V-CAp. It is not 13 bs 14. It is 13 vs 18. (humblehifi-Score-points.) The Duelund CAST arre a must with the Unbalancer. You will ne very surprised. BTW they are on sale at hificompents.uk
Thanks just checked the site (amplifier valve kits, HIFI pre-amplifiers, speaker kits,AMP Parts, upgrade components - right?) Would love to try those duelund cast pio, but even on sale the price is for caps. Will try the TAD 12bh7 though - thanks for the tip.
I joined OPC's new take on the pass d1 group buy - waiting for components to arrive. Interesting to see how it compares to the unbalancer. Will probably wait with the expensive modding until I managed to compare the two I/V's
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Old 18th February 2013, 08:03 PM   #12
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Use the neoohm resistors if you sant to save some money....but brlieve me, the unbalancer is a different animal with the duelund.
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Old 19th February 2013, 07:23 PM   #13
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I' am also using a Buffalo III with an Broskie Unbalancer circuit. For the unbalancer I used Z-Foil TX 2575 resistors, ony the I/V ones are Neohm wirewound. As coupling caps I'm using V-CAP CuTf between the stages and a Mundorf Silver/Oil bypassed by V-Cap CuTf at the output of the Unbalancer. I never got the chance to try Duelund CastPio, but already thought about it. I tried a lot of different tubes, even Siemens CCa and Telefunken E88cc. For me by far the best combination are Voskhod 6n23p from the 70s or early 80s as input tubes and Tungsram E80CC as cathode followers. I didn't find any alternative that came close. For me a big improvement was to use a battery(nimh) for biasing the input tubes.
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Old 19th February 2013, 07:54 PM   #14
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Bliz : is it Duelund all over ( all 4 caps ? )

Malarkey... Sounds interesting, I have long been speculating if the lm334 can stand the job, or some kind of two trans ccs would be better.
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Old 19th February 2013, 08:31 PM   #15
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Originally Posted by reenberg View Post
Bliz : is it Duelund all over ( all 4 caps ? )

Malarkey... Sounds interesting, I have long been speculating if the lm334 can stand the job, or some kind of two trans ccs would be better.
Yes, for the 6n23p I needed more than the given 10mA. I never tried a rial ccs circuit for biasing, but even though I'm using clean power with salas sshv2, using a battery was still a big improvement. I thought it would be critical to use a battery in a differential amp, but its absolutely not, no hum or anything at all.
Doesn't matter what tube I used, with the battery bias it was always a much cleaner and smoother sound.
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Old 19th February 2013, 09:04 PM   #16
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Which resistor values and HV did you use for those ? I like the 6n23 as well, but did not try them in this position...the e80cc did not really work that well as the 12bh7, how did you load taht one ?

The duelund are now in both positions and really work well, synergistical.
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Old 19th February 2013, 09:16 PM   #17
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Quote:
Originally Posted by Blitz View Post
I did not a big swapping contest there yet. Currently I use a TAD. Which is surprisingly good. But I need to revisit this as the whole character of the Unbalancer changed dramatically due to the other parts changes.

To give you an exapmple: I thought that I need to intregrate a stronger L-Pad before the tweeter when using the V-cap, as is was to treble-biased. Now with the Duelunds, you nearly would say: NOt necessary anymore...plus getting MORE transparency. Sound a bit weird, but they are much faster and better than V-CAp. It is not 13 bs 14. It is 13 vs 18. (humblehifi-Score-points.) The Duelund CAST arre a must with the Unbalancer. You will ne very surprised. BTW they are on sale at hificompents.uk
Quote:
Originally Posted by Blitz View Post
Use the neoohm resistors if you sant to save some money....but brlieve me, the unbalancer is a different animal with the duelund.
Blitz,

You are right on WRT Duelund caps. I can also recommend the VSF, they are
cheaper and still in same league of performance.

WRT tubes, I think NOS Mullard or Amperex are the go, not sure who used to
make BH7's.

WRT resistors, old tantalum + AB carbon comp are also worth trying.

This whole equation with Sabre is so damn complex, it will go right back to
the DAC board itself, layout, bypass, power supplies etc.

Sounds like you have it running pretty well though.

Goodstuff
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Old 20th February 2013, 09:02 AM   #18
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On the weekend I will try the Ropoint Wirewounds, the new An Tantalums non magnetic as i/v the Neoohms in other places like load resistor for the first stage or cathode resistor in the second stage...lots of fun...
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Old 20th February 2013, 10:15 AM   #19
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So your first impression of the BuffaloIII / Unballancer combo has changed quite a bit up till now ?
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Old 20th February 2013, 11:22 AM   #20
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Yes, a lot. It is unbelievable transparent and musical wit the ability to lift your whole High-End-Equipment. It gives you a basis to devlop speakers, anplifiers etc to the next level. But the integration of the FiFo was as well important. Today the EE has no chance.

Think about it: I can hear now the "right" or "wrong" how a resistor sounds. I hear not only "different", but what is right or wrong, which is a new quality for my chain. An unbelieable 3D-Effect which sounds very natural, "simply there". At the same time very good, fluid tonality.

Last edited by Blitz; 20th February 2013 at 11:37 AM.
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