Dartin Bout
100+ Head-Fier
- Joined
- Jul 8, 2016
- Posts
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- 56
What is the white notchy thing at the bottom that looks like something could be changed with a small screw driver?
How do you remove the case on the V6? It doesn't fit with the caps (Whammy) besides the op amp. Also should I remove the 8 pin connector on the V6 if I already have one soldered to the board?
[...]
Second Comparison: NuHybrid - V5i Singles / V6 Classic Singles:
Okay so I dont have any V6 Vivid Singles to test but may get the chance to try some in the future so I will talk about the differences between the V5i and the V6 Classic.
Firstly after listening to the above tracks on the V5i I noticed an immediate improvement over the stock OPA551 OP Amps that I purchased as part of the original BOM list for this amp. The OPA551's sound really good already with that clean BB sound signature. As most of you may know the V5i is semi-discrete yet the detail in the sound is unbelievable. Nice wide sound stage, good mids and treble and a decent amount of bass. I thought there was not much room for improvement as it sounded incredibly good already.
Then I popped the V6 Classics in. Straight away, I noticed that warm sound with such fine detail and the softer vocals yet for some reason they sound better in this amp than they do in the Whammy. Maybe its due to the fact that the NuTube still being a tube although a modern one still produces that warm tubey sound so the V6 Classic complements this amp nicely. Also compared to the V5i the V6 Classic seemed slightly more detailed and fuller sound to me probably due to the fact that the V6 is fully discrete.
With that said, the OP Amp I prefer so far in the NuHybrid is definitely the V6 Classic so I have left them in for future listening to see how they sound over time as they burn in fully.
[...]
In NuHybrid the OPA551 opamps are used as output buffers connected directly to the 6.3mm headphones jack, while the tubes are used as gain stage. Usually, Burson SS opamps should be successfully used in input stage, gain stage, I/V, LPF or DAC output stages, not to headphone amplifiers output stages. For >300 Ohms headphones Burson SS opamps will most likely drive them well, but when using normal or low impedance headphones these opamps will struggle to keep up the current (mA) due to the low intensity output they were designed to operate. OPA551 has over 200mA/channel, while SS opamps have less than a fraction of this, so you might overheat these opamps, not mentioning the increased THD when increasing the volume.
Burson SS opamps were not designed to directly drive headphones, especially low-impedance ones! For this task you can use powerful unity gain opamps like: BUF634, LME49600, OPA551/552 or something similar.
http://www.pmillett.com/file_downloads/Nuhybrid_sch.pdf - take a look to Pete's schematic, I'm sure you'll figure out that these opamps were not intended to get swapped with regular opamps, but BUF634 or LME49600 might work as well (a scope might be needed).
[...]As for the V6, I checked whether they would get hot or not as I noticed the Bursons got quite toasty in the Whammy but in the NuHybrid they get a little warm but that's it. I was really surprised.
Perhaps because the voltage inside your Whammy is +/-18V or +/-21.5V. Might worth measuring the voltage rails or let us know if you do have the 390 Ohms resistors or the LEDs installed.