Paul Joppa
Moderator
6520 is a 6AS7 with matched sections and high reliability.
Tube Rolling w/Crack
- Thread starter Dr. Toobz
- Start date
Still messing around with these Svetlana Winged C 6H13C. Usually I just give up on a tube when I don't like it's sound. One thing I noticed was my 12AU7 installed was a clear top. I replaced it with a Mullard Box Plate CV4003 and then just left the amp on for a couple days.
Things are much improved. Thinking about just leaving this tube in to save my highly overpriced Western Electric 421A. Recently lost a metal base 5AR4 on another amp that would cost a bundle to replace. I really need to get used to listening to newer production tubes and quit playing around spending money on uber tubes.
This Winged C is good enough with burn in and a good companion 12AU7 tube.
Things are much improved. Thinking about just leaving this tube in to save my highly overpriced Western Electric 421A. Recently lost a metal base 5AR4 on another amp that would cost a bundle to replace. I really need to get used to listening to newer production tubes and quit playing around spending money on uber tubes.
This Winged C is good enough with burn in and a good companion 12AU7 tube.
russell_janab
New member
I just finished my amp build about week go and recently added Speedball. I am simply blown away by the performance of my 650's
Obviously now I have an appetite to experiment further! my kit originally comes with the 6080
can anyone comment on their experience with replacing the 6080 with any of the ones below:
6AS7G
6H13C
5998
7236
6N13
All comments welcome and thank you in advance!
Obviously now I have an appetite to experiment further! my kit originally comes with the 6080
can anyone comment on their experience with replacing the 6080 with any of the ones below:
6AS7G
6H13C
5998
7236
6N13
All comments welcome and thank you in advance!
Nathan
New member
I am wondering about my tubes. Pre Speedball I ran Tung Sol 5998 and Mullard 12au7. By all accounts fine NOS tubes.
Now with the speedball, the bass is clearly better. Yet I'm also thinking that the overall presentation got a touch brighter too-
I substituted the 5998 with a nos GE 6as7ga I have and in fact the slight brightness I not on the crack/speedball/5998 isn't their. And the 5998 is a lovely tube- maybe it's the Mullard I'm hearing? I have an RCA clear top but that tube is a touch bright to start with so I wasn't going to throw that into the mix.
Pre Speedball, the 5998/12au7 combo was superb. What do people use with the speedball?
By the way, I have perhaps 1 hour of listening time on the speedball, so maybe it's still pretty green.
Thanks all!
Now with the speedball, the bass is clearly better. Yet I'm also thinking that the overall presentation got a touch brighter too-
I substituted the 5998 with a nos GE 6as7ga I have and in fact the slight brightness I not on the crack/speedball/5998 isn't their. And the 5998 is a lovely tube- maybe it's the Mullard I'm hearing? I have an RCA clear top but that tube is a touch bright to start with so I wasn't going to throw that into the mix.
Pre Speedball, the 5998/12au7 combo was superb. What do people use with the speedball?
By the way, I have perhaps 1 hour of listening time on the speedball, so maybe it's still pretty green.
Thanks all!
Hi Nathan,
I'm using the Tung Sol 5998 as well with Amperex Bugle Boys 12au7's and CBS Hytron 5814's. I've been very happy with both so far. I cannot comment no the Mullard's as I have not heard them.
Have you considered retrofitting the input tube so you can use other tubes like the 12BH7/5687/7119's. A few Crack users here say it is a far better sounding tube than the 12au7's. I'm looking into modding mine for those specific tubes.
EDIT: Btw, I've never had any problems with the brightness on both Amperex BB's and the CBS Hytron's.
Jim
I'm using the Tung Sol 5998 as well with Amperex Bugle Boys 12au7's and CBS Hytron 5814's. I've been very happy with both so far. I cannot comment no the Mullard's as I have not heard them.
Have you considered retrofitting the input tube so you can use other tubes like the 12BH7/5687/7119's. A few Crack users here say it is a far better sounding tube than the 12au7's. I'm looking into modding mine for those specific tubes.
EDIT: Btw, I've never had any problems with the brightness on both Amperex BB's and the CBS Hytron's.
Jim
Strikkflypilot
New member
I do not believe it is a straight swap, as the plate voltage would be low(terminals 1 and 5), there is a thread on retrofitting for the 12bh7, E80CC...
Rocketman248
New member
Adelz
New member
I recently finished my Crack and want to try out some other tubes. What are the most reliable places to buy tubes online? Also, would something like a 5814A and 5998A be a good start? Having no experience with tube amps other than the Crack, I feel a little in the dark regarding how much of a difference I can expect from different tubes and what a reasonable amount to spend on a tube is (there appears to be a huge price range for seemingly similar tubes).
Adelz said:
I have purchased tubes from vacuumtubes.net and would recommend them. i believe they currently have the 5998 for $85. it might sound expensive but look at the prices of 300Bs! You might receive a 2399 instead of a 5998 but they are the same. I have other tubes and would recommend not to buy a lot to try instead put the money towards a 5998. As for the 12au7 tubes it depends on what you like and the type of headphones you will be using!
Enjoy the process. It is extremely fun and satisfying!....Dave
The 12au7s I like the most so far in my crack/SB are the Mullard (CV4003 - military version) and the Radiotechnique (French military version) that I obtained from Upscale Audio. I have found Upscale to be a very reliable tube seller.
I also use the 5998 (actually 2399) and the Russian "winged C" 6H13C.
I also use the 5998 (actually 2399) and the Russian "winged C" 6H13C.
russell_janab
New member
Just got my russian winged C 6H13C and Gold Lion ECC82 ...man what can I say. The sound stage feels much wider, the base tighter and it is extremely neutral with an added clarity.
I added a dedicated DAC (Schiit Modi) instead of the Fiio E10 I was using and I have to say it feels cleaner. Only problem is prying myself away from the music
Thinking about ordering the 5998 from vacuumtubes.net
I highly recommend thetubestore.com, they are Canadian. Tubes arrived 2 days after I ordered them.
I added a dedicated DAC (Schiit Modi) instead of the Fiio E10 I was using and I have to say it feels cleaner. Only problem is prying myself away from the music
Thinking about ordering the 5998 from vacuumtubes.net
I highly recommend thetubestore.com, they are Canadian. Tubes arrived 2 days after I ordered them.
