[bcowen]

Try these guys...one of the best in the U.S. and they will not rip you off like some on eBay. Roy & Dale are great guys and are always fair and honest. Heck, you can even call them and that is rare these days. Check em out.
https://vacuumtubes.net/

There's also Upscale Audio and Tubeworld in the US. Both are expensive. But you get the real deal, and if there's a problem they'll take care of you. I've purchased numerous times from Langrex in the UK as well with good results every time. He sells on Ebay as well as through a web store. His prices are quite good in most cases for European manufactured tubes.

https://upscaleaudio.com/collections/vacuum-tubes
https://tubeworldexpress.com/
https://www.langrex.co.uk/

 

[SHIMACM]

[QUOTE = "bcowen, postagem: 16075118, membro: 489394"]
Rolar desta noite. GEC L63's e GEC CV4079's. Eu estava ouvindo um leve zumbido de fundo com o Pinnacle (russo) 6J5's. Com o L63? Silencioso. Silencioso também com a placa redonda 6J5 da Tung Sol. Portanto, os adaptadores de tubo duplo não são, por si só, um problema no DV (ou pelo menos no meu DV), mas pode haver alguma dependência de válvula em jogo.

Esta combinação está soando muito, muito bem.


[/CITAR]

Tonight's roll. GEC L63's and GEC CV4079's. I was getting a slight bit of background hum with the Pinnacle (Russian) 6J5's. With the L63's? Dead silent. Dead silent as well with Tung Sol round plate 6J5's. So the double-double tube adapters are not in and of themselves an issue in the DV (or at least my DV), but there could be some tube dependency at play.

This combo is sounding very, very nice.

Great to know it works well. Looking forward to my adapters. How would you rate the sound of this set in relation to your other valves? Would it be among your favorite games? And the GEC 4079 vs TS5998, what would you say?

 

[bcowen]

[QUOTE = "bcowen, postagem: 16075118, membro: 489394"]
Rolar desta noite. GEC L63's e GEC CV4079's. Eu estava ouvindo um leve zumbido de fundo com o Pinnacle (russo) 6J5's. Com o L63? Silencioso. Silencioso também com a placa redonda 6J5 da Tung Sol. Portanto, os adaptadores de tubo duplo não são, por si só, um problema no DV (ou pelo menos no meu DV), mas pode haver alguma dependência de válvula em jogo.

Esta combinação está soando muito, muito bem.


[/CITAR]


Great to know it works well. Looking forward to my adapters. How would you rate the sound of this set in relation to your other valves? Would it be among your favorite games? And the GEC 4079 vs TS5998, what would you say?

I haven't listened to the combo long enough or done any substantive A/B comparisons to offer anything but a high altitude opinion at this point. In combination with the L63's, and comparing as best possible the 5998 to the CV4079's, the GEC's have more harmonic info and color in the mids and a little more bloom in the upper bass without being bloated or overblown. They don't match the bass whomp and sense of power in the rest of the bass of the 5998 though. I think the L63/CV4079 combo will be a favorite, but one of several favorites. And more geared to classical than rock/metal. The 5998 along with either a Foton or Melz is metal-head paradise.

 

[SHIMACM]

I haven't listened to the combo long enough or done any substantive A/B comparisons to offer anything but a high altitude opinion at this point. In combination with the L63's, and comparing as best possible the 5998 to the CV4079's, the GEC's have more harmonic info and color in the mids and a little more bloom in the upper bass without being bloated or overblown. They don't match the bass whomp and sense of power in the rest of the bass of the 5998 though. I think the L63/CV4079 combo will be a favorite, but one of several favorites. And more geared to classical than rock/metal. The 5998 along with either a Foton or Melz is metal-head paradise.

thanks for the good answer

 

[DeweyCH]

So many tubes just waiting for adapters to arrive:

And my new knob for the DV came and fits perfectly!

Question, though... why do some of my 6J5 tubes have 6 pins but one has 7?

 

[JKDJedi]

So many tubes just waiting for adapters to arrive:



And my new knob for the DV came and fits perfectly!



Question, though... why do some of my 6J5 tubes have 6 pins but one has 7?

Is the 7 pinner a 6J5?

 

[JKDJedi]

Going old school this morning..

Sylvania 6SN7W shorty & Tung Sol 6080

 

[bcowen]

And my new knob for the DV came and fits perfectly!

Sweet!

Question, though... why do some of my 6J5 tubes have 6 pins but one has 7?

Probably because the person on the production line that day had math skills similar to mine.

 

[DenverW]

Going old school this morning..

Sylvania 6SN7W shorty & Tung Sol 6080

This is the way.

 

[DeweyCH]

Is the 7 pinner a 6J5?

Yeah it’s the taller Super Silvertone

 

[Deceneu808]

Quick question. What do you guys use as a power tube ? Will I have more gain/power output using a different tube than what I already have ? I can't really seem to find any replacements for 6as7. I have a Millard 6080 right now and a Svetlana 6as7g but I keep wondering if I can get more power out of the DV.

 

[bcowen]

Quick question. What do you guys use as a power tube ? Will I have more gain/power output using a different tube than what I already have ? I can't really seem to find any replacements for 6as7. I have a Millard 6080 right now and a Svetlana 6as7g but I keep wondering if I can get more power out of the DV.

A 5998 would be a good start. The 6AS7G and 6080 both have an amplification factor of 2, where the 5998 has an amplification factor of 5.5. The Western Electric site that had all the WE tube data has been taken down so I can't find the 421A data sheet right off, but it's going to be similar to the 5998 if not even exceed it a little based on the transconductance specification. Now, the end result of this amplification factor will depend on what voltages the tube is being operated at, and that is a constant in the DV regardless of the output tube plugged in. So it's not like you'll get "2X+" the power (or volume) out of a 5998 over a 6AS7 or 6080. But you will get some extra... just can't tell you how much extra from a numerical standpoint. From my own experience, the 5998 *is* a little louder at the same volume control setting as a 6AS7 or 6080. But there is no (compatible) output tube that's going to suddenly turn the DV into an output power monster just by plugging it in.

 

[Deceneu808]

A 5998 would be a good start. The 6AS7G and 6080 both have an amplification factor of 2, where the 5998 has an amplification factor of 5.5. The Western Electric site that had all the WE tube data has been taken down so I can't find the 421A data sheet right off, but it's going to be similar to the 5998 if not even exceed it a little based on the transconductance specification. Now, the end result of this amplification factor will depend on what voltages the tube is being operated at, and that is a constant in the DV regardless of the output tube plugged in. So it's not like you'll get "2X+" the power (or volume) out of a 5998 over a 6AS7 or 6080. But you will get some extra... just can't tell you how much extra from a numerical standpoint. From my own experience, the 5998 *is* a little louder at the same volume control setting as a 6AS7 or 6080. But there is no (compatible) output tube that's going to suddenly turn the DV into an output power monster just by plugging it in.

Thank you for the explanation. I have a hard time finding a 5998 tube in Europe thou. Only 6as7g Svetlanas on sale. Why are these so rare ?

 

[bcowen]

Thank you for the explanation. I have a hard time finding a 5998 tube in Europe thou. Only 6as7g Svetlanas on sale.

They are becoming harder to find all over, with prices escalating to match. I'd just keep your eyes out for one and hopefully you can pick one up in the future for a price you can justify. I've never heard anyone say "5998's suck," so it's a matter of finding one at a price that is commensurate with the value you personally put on the sound of it.

 

[JKDJedi]

A 5998 would be a good start. The 6AS7G and 6080 both have an amplification factor of 2, where the 5998 has an amplification factor of 5.5. The Western Electric site that had all the WE tube data has been taken down so I can't find the 421A data sheet right off, but it's going to be similar to the 5998 if not even exceed it a little based on the transconductance specification. Now, the end result of this amplification factor will depend on what voltages the tube is being operated at, and that is a constant in the DV regardless of the output tube plugged in. So it's not like you'll get "2X+" the power (or volume) out of a 5998 over a 6AS7 or 6080. But you will get some extra... just can't tell you how much extra from a numerical standpoint. From my own experience, the 5998 *is* a little louder at the same volume control setting as a 6AS7 or 6080. But there is no (compatible) output tube that's going to suddenly turn the DV into an output power monster just by plugging it in.

Amplification factors 421a 6.1 5998 5.5 7236 4.8