S.I.R. 100W SuperLead Schematic pt. II

[bennyx]

I think there are some substantial tone differences in the following and not just because of the recorder.

obviously....i have change the tubes

and i have changed a bright cap....in the old clips i used svetlana c logo 6550 and new china preamp....now i have JJ6550 and old china preamp......maybe JJ are a bit 'too smooth as 6550 .... I want something that sounds similar to GE could not find anything......old china are perfect for AFD sound

Come on man, you never play the guitar out of tune

i know but I was in a hurry.....I did not check the fine tune

[bennyx]

different position mic.....

guitar with right tune

i have change just a little the setting

https://www.facebook.com/video.php?v=10 ... nref=story

[CoffeeTones]

That is much better. Still a little different. Maybe the power tubes are the difference, maybe the Dalys are tired. It just sounded better to me, before you had filter cap and power tube problems a few years ago.

[CoffeeTones]

Would the Chinese tubes from 1993 be the same as the ones preferred here? Anyone know for sure?

[bennyx]

ops.....I just noticed that i have the low bias (35-36 ma)

this is why JJ sounded smooth
now sound correct (39-40ma)

Would the Chinese tubes from 1993 be the same as the ones preferred here? Anyone know for sure?

old china sound smooth, with 3D mids, sound very cool....i love it

new china sound bright and scooped....I don't know when it was made this change, however, should be recognized by the building .... the old have a different getter....have changed the structure of the tube

maybe the Dalys are tired

no the Daly remained are still good ..... there aren't ghost notes

[rockgod212]

sounds really good benny, I tried my amp without a brite cap and it was a no go, I needed one. maybe its amp specific with or without the brite cap. what choke are you using, I think I have the 3H 2 hole one, maybe that has something to do with the amp as well. I might have to get a 7H 4 hole choke at some point.

[bennyx]

I tried my amp without a brite cap and it was a no go, I needed one

are you sure you use the 1959 77' exactly specs?

are you sure you have the shield trick that cut too much freqs?

some people use a too long shield cable.....use 33pf is better....

what choke are you using,

i use the stock choke....but i don't believe that is the problem

[Unique]

Would the Chinese tubes from 1993 be the same as the ones preferred here? Anyone know for sure?

If they are the ones with the square foil getter, with two support post, and triple mica then they are the older ones. I think they made those up until 1994 or 1995. I'm not certain though. However, I do have a couple of the 6N4's dated from '93. There is a guy on eBay selling the Beijing Military 6N4's and the nos Sino 12AX7's who states that both may be the same military tube with just different logo's. Just google "eBay true nos beijing military 6N4 tube" and there is this guy's write up, and the tube king has a write up on them. They really are the secret to the AFD and #34 sound. They give you great distortion with the gain set around 1.5 - 2. With my gain set on 5, it sounds like it use to when I had cp chinese tubes with the gain set at 10.

I think on Slash's old Snakepit website, he states that he has always used Chinese Groove Tubes preamp tubes. Groove Tubes used to rebrand these tubes, so it makes sense that he might have been using the older Chinese tubes in his amps back then. They definitely lend themselves well to the AFD and #34 sounds, better than any other tube I've heard.

[CoffeeTones]

I believe I have over a dozen of these tubes. I'll have to check the getters to be sure. Not sure about the posts, but I remember they are dimpled, square foil and triple mica.

[CoffeeTones]

Here are some I have. Looks like the ones.

[Unique]

Yep, that's them, rebranded by Marshall. I have one of those that came in my amp also which I have completely forgot about. If you look on the bottom you should see either a "J", a smaller "JS", or something like that. Some of the J's I've noticed are hard to see, but held in the right light you can make them out.

[budubum92]

i have a couple of old chinese 12ax7 from very early 90s or late 80s.

how do i know if they still have enough life in them without having a hikock tester?

[ivan H]

Just pop them in & see how they perform. If u like how they perform they're good. I believe that Peavey also used these tubes. I have 3 pulls from a classic 50 that a friend got me to retube. Same as the tubes pictured above, with 12AX7A stamped lengthwise in red & a small made in China paper sticker attached. Cheers

[Unique]

... Same as the tubes pictured above, with 12AX7A stamped lengthwise in red & a small made in China paper sticker attached. Cheers

That's what they call the Sino 12AX7. I like those a lot. I got a couple of them off of some guy on eBay last year. I also have a couple of Ruby's I got off of eBay not too long ago dirt cheap. They have the exact same internal build; square foil getter, and triple mica's, but they don't sound anywhere as good the 6N4's, or Sino's I have. I don't know why because I thought they were the same. They look identical to the others, except for the logo's. However, they are very fuzzy and flat sounding, and just not quite as musical. So maybe they all are not the same. From what I read the 6N4's were made to military specs, so maybe some of the others that are re-branded were made for regular production. Or they could have just been duds. It happens.

[Unique]

Hey Coffee, have you tried those tubes yet? If so, what do you think about them, and how do they sound?