Hi Bernhard,dice45 said:
Yes, they're Chris' Verus amps. Sorry I thought I credited them on the first post with the pic this morning. I can see no real benefit in the use of 866's myself, except for the cool aesthetics, unless you plan on building a GM100 amp and need the 10kV PIV.
I think Dave Slagles amps' have them too, but I couldn't find a link, and I was in a hurry this morning.
211 driven by a 211, eh? Very Sakuma-san.(bows deeply)
Cheers
yup. ThomasMayer-san meanwhile.
He's got nine signal trannies in his amp system. A system killing any popular signal transformer prejudice you could have. So it did with me. 🙂
hrmm.. my hickok has a #83 in it.
I believe this is a mercury vapour rectifier.. Does that mean this will have the same blue effect? (never opened it while operating)
I should probably track down a #83 and a 5Y3 for backup.
I believe this is a mercury vapour rectifier.. Does that mean this will have the same blue effect? (never opened it while operating)
I should probably track down a #83 and a 5Y3 for backup.
Colt45: No the 83 in the hickok won't glow unless you pass some really high current through it. I have a high end stark tester and it uses an 83. Usually 83's are used in those testers for testing special super high voltage diodes that are very rare now. I checked mine even with a diode check in progress and it didn't glow at all, further testing will tell if there is current of any sort flowing through the tube but I'm not sure for now.
Hmm.. well I checked the whitepaper and it says there may be a blue glow.
I thought they used the 83 in testers, because it had a consistent drop of ~15v all the way up to the maximum plate voltage ?
I thought they used the 83 in testers, because it had a consistent drop of ~15v all the way up to the maximum plate voltage ?
Yes, the 83 does have a constant voltage drop, because the mercury also acts a bit like gas in a regulator tube. But it won't glow very brightly until current flows through it though it is said to emit lots of ultraviolet light. I don't doubt it glows under normal conditions and the reason mine didn't is either it's too old or I had too little current flowing through it. The paper does tell the truth though, the tube will possibly hae a gentle blue glow under the riht circumstances
Member
Joined 2002
I think that if i build a tube amp ill trya kit first so that way i live to hear it.. here is what i am thinking about buying.. but as for now im building my aleph 5 amps and pre amp first.. then ill go tubes..
http://www.qkits.com/serv/qkits/velleman/pages/K4040.asp
J'
http://www.qkits.com/serv/qkits/velleman/pages/K4040.asp
J'
Attachments
Interesting kit, I've seen it elswhere at another online store.
BTW, do you know how to design with tubes or transistors? Or do you just like to build kits?
BTW, do you know how to design with tubes or transistors? Or do you just like to build kits?
Member
Joined 2002
im good with speakers mostly but i know lots about amps and i did bild a amp but you havent seen my l\post ill look forit later then post it..
kits are just for fun and myalephboards i ordered because i wanted colour and profectionst boards..
j'
kits are just for fun and myalephboards i ordered because i wanted colour and profectionst boards..
j'
Two quick points:
1) A tube will glow blue if a stray stream of electrons hits the glass envelope; some compositions of glass will fluoresce quite nicely under these conditions. 6L6 tubes, in particular, are quite prone to this. Differentiate between whether the glow is coming from inside the tube or from the glass. Yes, some tubes glow blue naturally, just as a byproduct of how they work. We've had several threads on this at the rate of about one every six months. There was one nice one (pictures included) with mercury rectifier tubes, but I can't remember the name of the thread at the moment. Last fall, maybe? And, yes, I believe Cary Audio had/has some product like that.
2) I believe the small tube in the first picture is lit from beneath with a blue LED firing up through the hole in the center of the tube socket. Any color of LED will do for this...green, yellow, blue...but most folks use red or yellow if they're going in for supplemental lighting. Carver just uses little incandescent lights behind each tube in one of their preamps. It's just there for looks.
Grey
1) A tube will glow blue if a stray stream of electrons hits the glass envelope; some compositions of glass will fluoresce quite nicely under these conditions. 6L6 tubes, in particular, are quite prone to this. Differentiate between whether the glow is coming from inside the tube or from the glass. Yes, some tubes glow blue naturally, just as a byproduct of how they work. We've had several threads on this at the rate of about one every six months. There was one nice one (pictures included) with mercury rectifier tubes, but I can't remember the name of the thread at the moment. Last fall, maybe? And, yes, I believe Cary Audio had/has some product like that.
2) I believe the small tube in the first picture is lit from beneath with a blue LED firing up through the hole in the center of the tube socket. Any color of LED will do for this...green, yellow, blue...but most folks use red or yellow if they're going in for supplemental lighting. Carver just uses little incandescent lights behind each tube in one of their preamps. It's just there for looks.
Grey
OK folks,
I do not recall if anyone identified that one tube circuit on PCB that had that "blue glow" on the bottom... but that is a blue LED under the tube. I have a friend that did the same thing. It is pretty, but not real.
OTOH, I have five vintage blue glass 27's. They are blue tinted glass. I will post a pic in the near future, for those who are interested. I am planning on making a small stereo amp with the 27's as pre's and 45's as outputs.
As for those... what look like very high voltage tube amps... that do actually glow blue... I think it is due to the high voltage as well as whatever ionized whatever there is inside.
Mercury rectifiers do glow a nice blue also, but why would one want to introduce the noise?
Gabe
I do not recall if anyone identified that one tube circuit on PCB that had that "blue glow" on the bottom... but that is a blue LED under the tube. I have a friend that did the same thing. It is pretty, but not real.
OTOH, I have five vintage blue glass 27's. They are blue tinted glass. I will post a pic in the near future, for those who are interested. I am planning on making a small stereo amp with the 27's as pre's and 45's as outputs.
As for those... what look like very high voltage tube amps... that do actually glow blue... I think it is due to the high voltage as well as whatever ionized whatever there is inside.
Mercury rectifiers do glow a nice blue also, but why would one want to introduce the noise?
Gabe
Hello,
I am very very very new here and am no tube guy. I read this and I remembered something at AVVT site. You can see it for yourself.
http://www.elektronenroehren.de/avvt/indexf.htm
They say there can be something called fluorescence along with reg tubes and gassy tubes.
Tomo
I am very very very new here and am no tube guy. I read this and I remembered something at AVVT site. You can see it for yourself.
http://www.elektronenroehren.de/avvt/indexf.htm
They say there can be something called fluorescence along with reg tubes and gassy tubes.
Tomo
Blue!
My first large tube amplifier employed a quartet of 7591 beam power pentodes. Lovely blue glow. I am still mesmerised by the glow of tubes, be it red or blue. I wonder how spectacular the glow of an operating ignitron would be! I'll provide the sunscreen. 😀
My first large tube amplifier employed a quartet of 7591 beam power pentodes. Lovely blue glow. I am still mesmerised by the glow of tubes, be it red or blue. I wonder how spectacular the glow of an operating ignitron would be! I'll provide the sunscreen. 😀
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