That's up next.
ZMF Aegis Official Thread
- Thread starter AnyDave
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Good point, and I believe the Red Print is also a differentiator in sonics as well.
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The GZ34 is more open, quicker and linear sounding, with a bit stronger dynamics and punch. The GZ32 is a bit more forward and warmer, yet does layering incredibly well, so the stage still breathes a bit. That being said, I find the GZ32 paired up with the Cossor can be a bit too much of a good thing with the mids, and the stage becomes a bit more intimate than I like. That's just my preference though, and some may prefer the more forward warmer sound of the GZ32.
Of note, my GZ34 is a brown base double d getter from the Sittard factory, and is said to sound quite a bit different than the Mullard GZ34. That also being said, my GZ32 is an earlier welded black plate with square getter, so may sound a tad different than the latter years with grey stapled plates. . .
So many tubes, and so many variations that can all sound a bit different, can be a bit daunting when trying to get a handle on how a tube sounds, and the good thing is that they all sound incredible in the Aegis. Of course some sound "better" than others, but one would never notice unless comparing side by side.
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You want a lush 6SL7 kind, that would be the 1579. I actually find the 5691 to be clean, open and extended, and don't really get much lushness with that one. . .
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Can you take a picture of your 807 and VT60a side by side? I am curious about all the little variations I am seeing and trying to get a handle on what's what.
A bit of History: https://spectrum.ieee.org/the-807-a-vacuum-tube-for-the-ages
PS Is anyone using or thinking of using Socket savers? Pros/Cons?
PS Is anyone using or thinking of using Socket savers? Pros/Cons?
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Any way to get past the paywall?A bit of History: https://spectrum.ieee.org/the-807-a-vacuum-tube-for-the-ages
PS Is anyone using or thinking of using Socket savers? Pros/Cons?
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Got the day off and just rolled in a pair of Fivre 807 Black Plates. 
Time to see how they compare to the Cossor ATS25 and "Mullard" 807. . .
@yupio this one's for you.
Time to see how they compare to the Cossor ATS25 and "Mullard" 807. . .
@yupio this one's for you.
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Sci-Hub is worth a shot. It has free access to a lot if scientific Journals.
Got a lot of papers written that way.
I think socket savers just make the signal path a bit longer and are an eye sore myself, so have never seen a need for them. I have been rolling tubes non-stop for years, and have never seen or had any issues with just the regular sockets on any of my amps. That being said, to each their own and I know some like using them.A bit of History: https://spectrum.ieee.org/the-807-a-vacuum-tube-for-the-ages
PS Is anyone using or thinking of using Socket savers? Pros/Cons?
Also, I love seeing old tube advertisements, and thanks for sharing!
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I still dont know what the cap is used for, i think i read that its a anode voltage cap somewhere. Is it like dangerous to touch? will the tube break/blowup if its touched when the tube is on?I got curious enough to finally take the 5691’s out and rolled in the 1940’s smoked glass RCA 6SL7’s. I’m hoping to get a little bit of the lush mids of the 6V6GT’s I liked so much alongside the expansive staging of the EL38’s. We’ll see if the experiment is successful.
Toonartist
Formerly known as dAndis67
Here are a few photos of the two pairs. One pair was bought as a pair of Cossor VT60a (pair 1). The other two were listed as Type 807 / VT60 / ATS25 (pair 2).
Ok... first up are two photos are the 2nd pair. Then on the left seems has the remains of some red print. The plate also has more of a dark dusty black look to it. The one on the right is black but more grey showing through. It also has the black flashing (from the outside, silver inside) rather than the bright silver on both sides. I have a pair of EL38's with black outer getter flashing and they're dated early 1952. The tube on the left has "Type 807" sandblasted onto the glass, nothing else (apart from the remains on the red print). The one on the right with black print VT60 / 6.3-25.
Pair 1 are identical. Both have VT60A / 6.3-25 IOE/587 in white print. The internals look very similar, the first pair have a thicker darker black coating on the plate. They also have a different way of connecting to the top cap (last two photos). Pair one clearly has a wire coming off from one side where as pair two both have a wire that seems to come off from the centre, straight up into the cap... more or less out of sight.
From a brief listen of the 2nd pair and some 32 hours with the first, I'd say the 2nd pair sounds a little thicker, more lush compared to pair one. Both pairs have a nice full sound to them, great bass... probably not as textured as the EL39 but very good all the same. Pair one seems to extend further (high frequencies). Not in a fatiguing way but you get a sense of more detail and a bit more dynamic. Both have great sub bass extension. After I've finished running in the first pair I'll pop in the second pair to confirm this.
The glass on this one seems a lot thicker, you can see the rings in the glass in this photo.
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Thanks! I am betting they start sounding more alike after they are both fully burned in.Here are a few photos of the two pairs. One pair was bought as a pair of Cossor VT60a (pair 1). The other two were listed as Type 807 / VT60 / ATS25 (pair 2).
Ok... first up are two photos are the 2nd pair. Then on the left seems has the remains of some red print. The plate also has more of a dark dusty black look to it. The one on the right is black but more grey showing through. It also has the black flashing (from the outside, silver inside) rather than the bright silver on both sides. I have a pair of EL38's with black outer getter flashing and they're dated early 1952. The tube on the left has "Type 807" sandblasted onto the glass, nothing else (apart from the remains on the red print). The one on the right with black print VT60 / 6.3-25.
Pair 1 are identical. Both have VT60A / 6.3-25 IOE/587 in white print. The internals look very similar, the first pair have a thicker darker black coating on the plate. They also have a different way of connecting to the top cap (last two photos). Pair one clearly has a wire coming off from one side where as pair two both have a wire that seems to come off from the centre, straight up into the cap... more or less out of sight.
From a brief listen of the 2nd pair and some 32 hours with the first, I'd say the 2nd pair sounds a little thicker, more lush compared to pair one. Both pairs have a nice full sound to them, great bass... probably not as textured as the EL39 but very good all the same. Pair one seems to extend further (high frequencies). Not in a fatiguing way but you get a sense of more detail and a bit more dynamic. Both have great sub bass extension. After I've finished running in the first pair I'll pop in the second pair to confirm this.
The glass on this one seems a lot thicker, you can see the rings in the glass in this photo.
The Fivre 807 are warmed up now, and they sound freaking fantastic. 
Compared to the Cossor and Mullard, the Fivre are cleaner and more linear top to bottom. The Fivre have more air, and treble extension and are a nice change up from the other two, of which are warmer/thicker. The detail is on par with the Cossor, and nuances are coming through in full effect. The bass hits hard and is tight, the mids have a hint of euphony and the highs sparkle. The vocals are crystal clear and airy and sound so beautiful it's breathtaking. This is a very nice tube, and I feel it will pair up better with a lot of different inputs and rectifiers due to it's excellent linearity and transparency. That being said, I am going to roll in some 1579 next to see if I can thicken up the sound a bit, and get a little better tone. . .
Fivre, Mullard and Cossor 807's are such fantastic tubes, and get big recs from me.
Back to the music I go. . .
Compared to the Cossor and Mullard, the Fivre are cleaner and more linear top to bottom. The Fivre have more air, and treble extension and are a nice change up from the other two, of which are warmer/thicker. The detail is on par with the Cossor, and nuances are coming through in full effect. The bass hits hard and is tight, the mids have a hint of euphony and the highs sparkle. The vocals are crystal clear and airy and sound so beautiful it's breathtaking. This is a very nice tube, and I feel it will pair up better with a lot of different inputs and rectifiers due to it's excellent linearity and transparency. That being said, I am going to roll in some 1579 next to see if I can thicken up the sound a bit, and get a little better tone. . .
Fivre, Mullard and Cossor 807's are such fantastic tubes, and get big recs from me.
Back to the music I go. . .
Toonartist
Formerly known as dAndis67
Hopefully... the first pair sound extremely good with the AC for electronic. For classical I think I still prefer EL39 as they have lovely texture which really becomes evident with stringed instruments.
I feel I have all the tubes I need, want with the VT60a / 807 and various EL tubes plus KT88s. They all have their differences, strengths etc and I don't feel like I'm missing anything. I have a lovely pair of RCA 6V6GT Grey Glass that I never even use as they didn't beat any of the others. I feel that would happen more often now as the ones I have really would take some beating I feel!
