Totally Tubular: The Tube Thread
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AnthonyI
Well-Known Member
They cut down on "bottle" vibrations, meaning glass is usually more sensitive to vibrations and when the tubes are internal it's a bit more susceptible than say on the PL, where the tubes are external/outside. It's one of those things where unless you can A/B it, which I didn't, I would fall back to cost. If their affordable it might be worth a try.
This is what they look like on the Jolida -
My tubes are outside but my amp isn’t quiet, it is through the speakers, but physically it has noise from the tubes. Got me wondering. That said from my limited reading the herbies seems to be the best and that involves transatlantic shipping and I would need 10...
AnthonyI
Well-Known Member
Ouch........
Exactly. Hence why it’s a thought, not necessarily a purchase. Although it if makes more difference on, for example, the big output tubes, I may look to do it in stages!
AnthonyI
Well-Known Member
That's actually not a bad way to go about it, I would think the larger tubes would be the biggest culprits and would offer the most "difference" for the sake of knowing if it's worth doing it across the board.
kvetcha
Well-Known Member
The KingKo doesn't get back to me until Friday, so in the meantime I've been putting some hours on the Decware. My memory of the Jo might just be poor, but the imaging on this amp is something else.
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kvetcha
Well-Known Member
Anyone ever had transformer hum feed back through a microphonic tube?
Bloodlemons
Well-Known Member
Not that I know of.
kvetcha
Well-Known Member
The Decware has an audible transformer hum, which in and of itself is not a problem, but I am hearing it faintly through the speakers. It's not a 60hz hum, closer to 100hz.
I do have one microphonic 6922 input tube that's pinging noticably when I tap it, so I'm wondering if that might be causing the issue.
The sound is very faint, inaudible in normal listening, and happens regardless of selected input or volume level.
No but theoretically it could happen.
kvetcha
Well-Known Member
I'm debating buying new 6922s since I will have no use for them if I decide not to keep the Decware.
I guess it's a pretty marginal expense.
apholden
Active Member
Does the Decware use DC or AC heaters in its tubes? I ask because my Bottlehead came with AC heaters, and it hummed like mad. An upgrade to a DC heater circuit for the 300B tubes solved that.
kvetcha
Well-Known Member
I actually haven’t the slightest idea.
kvetcha
Well-Known Member
I removed the 6922s entirely and the hum is so quiet as to be basically inaudible, so it's probably the microphonic tube making things worse.
You’ve lowered gain significantly too though. Get some 6922s and you’ll be good.
kvetcha
Well-Known Member
Good point.
I should probably swap out the rectifier and power tubes first and see if that makes a difference, since I have spares on hand.
kvetcha
Well-Known Member
Well, it's either the 6922s or it's something in the amplifier. Power tubes and rectifiers made no difference.
I suppose it could be the voltage regulator tubes, but those are supposed to be able to last the lifetime of the amp.
I suppose it could be the voltage regulator tubes, but those are supposed to be able to last the lifetime of the amp.
Jango
Active Member
Calling Decware is probably the quickest way to your answer: (309) 822 5255
Jango
Active Member
Since I'm heading up to New Hampshire to drop off my Sutherland at Fidelis, I'm going to go demo a Prima Luna EVO 300 @ Audio Video Therapy. As it turns out, they carry my Focals so it'll be kinda like listening at home. Okay, not really. But it should be fun.