Darkvoice 336SE stock power tube is sparking internally and has started to glow blue. Is this bad?

[Nick_Mimi]

Darkvoice 336SE tube rolling

Got my Darkvoice a few months ago and the stock tubes were pretty good for me, but it was my first tube experience (so nothing to compare it to) but everyone says they are trash so I decided to invest $40 into a pair of RCA tubes that don’t sound much different to me (although it is hard to compare tubes when you have to warm them up in between, unless you have two amps). So I wanted to see what everyone’s experience is with darkvoice tubes. It seems to be a fairly popular amp considering Zeos h…

Darkvoice SE Advice, what tubes and where to buy?

So I’ve been running my Darkvoice SE solo since I recently switched to a SDAC-B from my O2/ODAC combo and am waiting till November for THX789. I tried using the SMSL SAP VI, but the sound felt claustrophobic, so I decided a couple months maining a tube shouldn’t be too bad (despite using Plainars on it too) with my HD 650. I was trying to look into tubes to alter the Darkvoice a bit, but I’m just not seeing a place to buy that seems reliable. First off, what size tubes does the Darkvoice use an…