Re: 6L6 Tubes

On 12/17/2010 2:57 PM, adam79 wrote:
On 12/17/10 1:09 PM, Jim wrote:

Long plates *can* be subject to more microphonics, especially in a combo
amp. But I love the Mullard long plates in my Marshall. ...and a guy
that called me out of the blue (found me here, I guess) swears by that
new JJ long plate.

I noticed that some people hype the tube's getter when advertising tubes
(i.e. emphasis on a "thick" getter, or a "D" getter). From my
understanding, the getter absorbs the gasses in the tube. Does the "D"
getter, or other letters, refer to it's shape? Does the thickness, size
and/or shape of the getter affect the sound or does it have more to do
with the tube's longevity (i.e. a thicker getter will extend the life of
the tube because it can absorb with more efficiency)?

The getter design often tells you something about the date of production of the tube. So it's not that the D getter is special, it's that the TUBE is special.




Also, black plates vs. gray plates. Is there any difference is sound, or
does it all depend on the tube the plate it in? Do black plates run
cooler than the gray plates because the absorb/reflect more heat? From
my research, black plates came before gray plates. From what I've read,
the length of the plate affects the sounds more than the color.

You can't generalize. Other black plate tubes won't sound like an RCA black plate, for example.

But carbonized nickel does have characteristics that make it a good choice for plate material. Look up thermal emissivity and plate dissipation.




I've just begun my research of the make-up of tubes, so the point of
this post is to confirm that I'm taking in the information correctly.

Thanks again for helping me out,
-Adam

.

Relevant Pages

  • Re: Valve Senior...redux
    ... Don't know squat about the amp, but I've been able to avoid the ... the only amp I have at the moment that uses that tube. ... I am not sure black plate vs gray plate is anything but a specious ... I've got a mixed pair in the TW, both Sylvania, one gray, one black plate.. ...
    (alt.guitar.amps)
  • Re: Suppressor grid characteristics of EL34? Re "Tone Lizard" article (warning Amp Content)
    ... Punched it and drilled it to take more controls, 2 octal tube sockets ... cathode, he proposes connecting them to the bias supply, making them ... for small-signal pentodes where pushing the suppressor grid negative ... actually acts to CUT OFF the plate current, ...
    (alt.guitar.amps)
  • (afterthoughts) Re: SB-230 saga continues
    ... Craig, you might also want to think about finding someone local to you who is experienced and who can look over your shoulder and who ... I don't remember from the begining if whomever you bought the amp from said, or did not say, if he knew the amp was working fully up to snuf with no problems. ... You could have a simple problem (I can't otherwise guess what is causing the 3 kv plate voltage reading on the meter) with getting the amplifier to work, or it could be tricky (and/or expensive, if the tube ...
    (rec.radio.amateur.boatanchors)
  • Re: Valve Senior...redux
    ... Don't know squat about the amp, but I've been able to avoid the ... the only amp I have at the moment that uses that tube. ... Chuck, I suppose I prefer gray in the beard over long in the tooth, but it's ... I am not sure black plate vs gray plate is anything but a specious ...
    (alt.guitar.amps)
  • Re: Valve Senior...redux
    ... Don't know squat about the amp, but I've been able to avoid the ... the only amp I have at the moment that uses that tube. ... I am not sure black plate vs gray plate is anything but a specious ... Willie will test and see if they match, ...
    (alt.guitar.amps)