I find the KT88 a bit warm and lush for my ears. A nice euphonic sound as either power or driver tubes (I've not tried a quad) but ultimately have not used them much. Maybe they would suit treble strong headphones or an overbright recording. I should try them with my old K701's if I can find...

I imagine only Feliks Audio could give you a definite answer but for what it's worth I've been using T-S KT150's as power tubes with a variety of drivers for several months without any problem. At present I'm finding Brimar 6L6G drivers pair very well. I've also had good results with Valvo EL11...

Mains hum problems are documented with Ember-just Google 'Project Ember Hum' and you will get a flavour of the problems. It's very position, equipment and tube dependent. Mostly it's trial and error when finding a solution. I managed to remove a hum by connecting an earth wire between one of...

Thought it might be worth recording that at present I'm enjoying excellent sound from my DV using 5998 and Tungsram E80CC, with suitable 12/6V adapter of course.

I use a Sennheiser HZR 62 which I find doesn't intrude on the sound and allows channel balance control too. The lead is too long for me and I've reduced the size and reconnected with a 6.3mm plug.

A few weeks ago I had tubes purchased on eBay seized by US customs. I was informed it was because electronic vacuum tubes contain mercury and the tubes were therefore classed as hazardous.

Totally agree with you about ECC804. It's a very good, under-appreciated tube.

You can use a 12AU7 without a separate 12V heater power supply using this compact and inexpensive adapter: https://www.ebay.co.uk/itm/1pc-Gold-plated-12AU7-12AT7-ECC82-TO-ECC88-6922-6DJ8-Tube-converter-adapter/192035120609?epid=166880670&hash=item2cb62f65e1:g:QRMAAOSwA3dYNUfL Here's a photo of...

You may be able to use the 12AU7 with an adapter but the EL84 is a pentode with a heater current of 750mA and that won't be suitable.

Thanks @ThermalAlchemy. Sorry, I wasn't clear in my post as I was referring to the heater current but it doesn't matter as all the tubes I like are equal or less than the heater current of the stock tubes anyway. Those measurements you made are fascinating- 450V-well no wonder we are warned not...

What's with this hum with the Russian made Tung-Sol 6SN7? I've used this tube in several amps and it's as quiet as any tube I possess then, after reading this thread, I tried two in DV and both hummed loudly in both channels. There must be some bad synergy or something else going on, and then it...

Does anyone know what are the maximum safe current draw of tubes, both in the power and driver sockets, for DV?

HD800 and Vali2 are both very versatile and most tubes I have tried sound good with them. I would read about the characteristics of the various tubes in the Vali2 Forums and then try one or two which have the characteristics you seek as you are the only person who can answer your question.

My advice would be for you to try your new Vali 2 with the provided stock tube and let us know how it sounds to you. We will then have a familiar reference point. I don't think as many will have heard the 5670 and that would make comparisons difficult. I presume your HD800 is well burned in as...

All I can tell you is the volume from the RCA outputs is controlled by the volume knob and if you take out the tube there is no sound at all from the RCA outputs. Sorry if this doesn't help.

ECC88/E88CC Mullard, Tesla, Tungsram, or a Bugle Boy might suit.

Mimby=Schiit Modi Multibit Bimby=Schiit Bifrost Multibit. Strictly speaking they should have had an i at the end not a y You can read all about them on Schiit's very good website. I am using Mimby at present and it sounds very good to me.

Good move! The 823's are the duals for the inputs and the other two the singles for the outputs, of course. :smile_phones:. I've also put all my opamps into their own dip-8 sockets for ease of rolling and to minimise breaking their delicate spidery legs, which I've managed to do several times...

Yes it seems that there has not yet been a decent evaluation of these V5i's compared to other op amps in H10 . They are also rated max voltage 16V, which could still be a problem, like with the V5. At present I'm using 627/823 and enjoying a clear, lively, engaging and euphonic sound.

Thanks ron, that's very helpful. 

Has there been any comparison of sound differences between the V5i and the previous flawed Burson V5 iterations, or with the stock, or with 797/823 combo op-amps which are considerably cheaper?

Thanks again.   The Ayre looks a nice DAC.   Just seen your reply above too. I like the way HD650 scales up so well with better quality amps and it's generally undemanding of the amp, working well with tube and SS.   My only small gripe is the sound-stage which to me lacks depth and...

@myphone   That's very interesting information. Thanks.   What sources are you using? 

That's good-as expected, getting better all the time.

Are any of you noticing Euforia's sound changing with burn in?