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Little Dot Tube Amps: Vacuum Tube Rolling Guide - Page 378

post #5656 of 8461
Quote:
Originally Posted by mordy View Post
 

I find that different tubes give different voltage readings at the tube pins. When I change a tube I adjust the pot to read the correct voltage at the tube. The LED readout or multimeter reading is usually a bit higher measured at the voltage regulator. As an example, the 6P6N-IR as a driver needs 6.3V, but the voltage regulator value has to be 6.45V to achieve this at the breadboard socket in my case.

 

Regarding wires I am skeptical. IMHO a foot or two should not make a difference. Me thinks some fancy interconnects work as tone controls....Of course, then you have silver.....

That could be  it i cahnged the tubes.

post #5657 of 8461
Grey Goose FTW!
post #5658 of 8461
Quote:
Originally Posted by i luvmusic 2 View Post

 

 

I have to admit, I really like the "Grey Goose" adapter. And I wonder if that bottle would fit over the two test sockets? If so, the bottom could be cut off, the bottle placed over the two test sockets, and the wires routed to a socket mounted on top? This might be just as classy as some of the brass steampunk adapters we have seen. :)

post #5659 of 8461

No i think i will put the LD 1 inside the bottle in that way you don't see any wires just the tube on top.:beyersmile:

This 6N6 it remind me of 6HM5 only have a bigger soundstage.

post #5660 of 8461

So, the Sylvania 6SN7GT-VT231s are in (as powers), and they certainly are VERY good (after an awful start with one tube giving the most horrendous hum - said tube having the slightest loose play in its base, but with a twist it's gone...not very happy, but they've obviously had a good bit of use and I didn't pay much for them...).

 

It's early days re trialling my different test CDs, but first impressions are not quite giving me the same "tingle" factor as the Psvanes - too early to put my finger on all the reasons, but the main difference seems to lie in the overall clarity of presentation. The soundstage is good, but somehow very slightly compressed in comparison - the C3gS magic in this area is not quite 100%. Possibly this is partly a by-product of the bass being deep but with not quite the same detail and finesse as the Psvanes. They can't seem to handle fast bass/drum runs as well, either.

Treble on the whole is very well handled, with occasional slight tendency to sibilance in certain tracks.

 

Have been listening to my Clannad 'Past Present' while composing this, and some tracks come over well but others the Sylvanias seem to be struggling with...prolonged listening, I fear, is going to be a bit of a mixed bag. At the moment, I feel they are not doing the C3gSs full justice...perhaps they need to be partnered with other drivers for better 'synergy'.

 

However, I shall continue with the testing and see how things develop.

post #5661 of 8461
Quote:
Originally Posted by hypnos1 View Post
 

So, the Sylvania 6SN7GT-VT231s are in (as powers), and they certainly are VERY good (after an awful start with one tube giving the most horrendous hum - said tube having the slightest loose play in its base, but with a twist it's gone...not very happy, but they've obviously had a good bit of use and I didn't pay much for them...).

 

It's early days re trialling my different test CDs, but first impressions are not quite giving me the same "tingle" factor as the Psvanes - too early to put my finger on all the reasons, but the main difference seems to lie in the overall clarity of presentation. The soundstage is good, but somehow very slightly compressed in comparison - the C3gS magic in this area is not quite 100%. Possibly this is partly a by-product of the bass being deep but with not quite the same detail and finesse as the Psvanes. They can't seem to handle fast bass/drum runs as well, either.

 

I am not completely surprised as the Sylvanias are not as balanced as your Psvanes appear to be. As I find this tube to be somewhat dry and bass deficient, I can imagine that it would pair very well with a warm, bassy gray-glass RCA. But it appears that your C3s have better synergy with a more balanced output tube.

post #5662 of 8461

Received a Bendix Eclipse-Pioneer 2C51 / 396A / 5670 in the mail today. (It seems that I am the only one rolling these tubes as well?)

 

The Bendix is considered one of the best and most desirable of the 2C51s and as I found this one at a good price, I grabbed it. First impressions, very good bass and treble, nice wide sound stage and lush mids. It sounds great with my HD 700s. :)

 

 

 

The vendor packed it very well, and with a surprising sense of humor. When I brought the mail in and opened the package, my wife asked, "Oh, did you buy me a new ring?" lol

 

post #5663 of 8461

Got my C3gS' running, initial impressions are very forward presentation, sort of in your face. I'm hoping the soundstage will widen a bit with some burn in.

 

Other than that they are ridiculously detailed and have very extended highs almost like cymbals are in the room with you, bass is very tight a well defined and mids are amazing, acoustic guitar sounds very realistic.

 

Tracks i use to test:

 

Bass: Jamiroquai - Cosmic Girl

Mids: Rodrigo y Gabriela - Foc

Percussion (highs): Daft Punk - Contact

Soundstage: Queens of the stone age: No One Knows (Lullabies to Paralyze Bonus Cd Live from Earthlink in Atlanta, GA)


Edited by mab1376 - 3/29/14 at 5:44pm
post #5664 of 8461

I really want to try these C3gs.... someday.... :)

 

Someone asked today what my favorite tubes are.

 

In no order:

 

2C51 = 1951 Bendix. (Until the arrival of the Bendix today, I would have said 1951 Western Electric)

6DJ8 = 1975 Voskhod 6N23P

ECC40 = Any of the Holland-made early 1950's tubes

6SN7 = 1944 Sylvania JAN-CHS-6SN7W

ECC80 = 1950's-1960's Holland made

 

All these tubes are more similar than different. All have very good bass and highs, with lush, somewhat warm, musical mids. I could be happy with any one of them, but for sure, it is nice to have all of them. :)

 

That said, I have had my HD-700s for less than two weeks, and I am still trying to get my mind around what I am hearing. They are very, very different than my HE-300s. And in fact, the only 6SN7 I have heard with these headphones is the Sylvania 6SN7W. As I get more comfortable with these headphones and slowly roll through the rest of my tube collection, it is certainly possible that my list of favorites might change.

post #5665 of 8461

Hi I luvmusic 2,

 

Enjoyed your "grey market" adapter LOL. Did you check out how a Scotch bottle adapter sounds?

 

Anyhow, on Gibosi's suggestion I am trying out my stash of 6N6P family tubes. Briefly tried my best power tube before the 6SN7 era - the 6N6P-IR. This tube did not match well with my two RCA 6SN7 power tubes and sounded thin and unengaging.

 

Next tried my least desirable power tube, the 6N6P as a driver tube. Surprise - it sounds very good! Musical and good bass, maybe bass is boomy - gotta give it more time. Then the P-i and gold grid.....

post #5666 of 8461

Hi G,

 

Speaking of 2C51 tubes, there is a 12V octal dual triode called 2C52, which was designed for aircraft servo-amplifiers. Anybody has experience with this tube? Perhaps similar to the 12SX7 tube....

post #5667 of 8461

the 2C52 is a new one on me but if you like the 2C51 sound (massively under rated tube imho) look out for the LM Ericson european ones (gold pins) as the best I found though they are getting pricey now but you may get lucky still with effort searching. The wild card is the Reflector 6N3P DR, note the DR bit which is the 'most rugged' Russian variant and still not silly money. The 2C51s however are a very good quality across all the different manufacturers.

post #5668 of 8461
Quote:
Originally Posted by mordy View Post
 

Hi I luvmusic 2,

 

Enjoyed your "grey market" adapter LOL. Did you check out how a Scotch bottle adapter sounds?

 

Anyhow, on Gibosi's suggestion I am trying out my stash of 6N6P family tubes. Briefly tried my best power tube before the 6SN7 era - the 6N6P-IR. This tube did not match well with my two RCA 6SN7 power tubes and sounded thin and unengaging.

 

Next tried my least desirable power tube, the 6N6P as a driver tube. Surprise - it sounds very good! Musical and good bass, maybe bass is boomy - gotta give it more time. Then the P-i and gold grid....

 

 

Yup the Grey adds a little touch of warm into the sound.I tried the 6N6P and like what i said before it remind of 6HM5 and pair well with my 6N6p-i driver tube so now i can't wait for my Russian 6AS7,6N9C and the RCA 6SN7 driver tubes oh and the Parts coming from Chinada.

post #5669 of 8461
Quote:
Originally Posted by mordy View Post
 

Hi G,

 

Speaking of 2C51 tubes, there is a 12V octal dual triode called 2C52, which was designed for aircraft servo-amplifiers. Anybody has experience with this tube? Perhaps similar to the 12SX7 tube....

 

The 12SX7 is electrically identical to the 12SN7. The only difference is that it was designed to be less microphonic. So yes, it is simply a premium version of the 12SN7.
 
The 2C52 is a high mu dual triode. While the 12SN7 has a mu of about 20, similar to a 12AU7, the 2C52 has a mu of about 100, similar to a 12AX7. This tube should work fine in our LDs as we have successfully used the high mu 12AX7 before and the pin-out is the same as the 12SN7.

post #5670 of 8461
Quote:
Originally Posted by mab1376 View Post
 

Got my C3gS' running, initial impressions are very forward presentation, sort of in your face. I'm hoping the soundstage will widen a bit with some burn in.

 

Other than that they are ridiculously detailed and have very extended highs almost like cymbals are in the room with you, bass is very tight a well defined and mids are amazing, acoustic guitar sounds very realistic.

 

Tracks i use to test:

 

Bass: Jamiroquai - Cosmic Girl

Mids: Rodrigo y Gabriela - Foc

Percussion (highs): Daft Punk - Contact

Soundstage: Queens of the stone age: No One Knows (Lullabies to Paralyze Bonus Cd Live from Earthlink in Atlanta, GA)

 

Hi mab.

 

Glad to hear you are now in C3gS land...congrats.

 

Am VERY perplexed re your very forward presentation!...I do hope your adapters are not going to hold back these tubes! However, given that the C3gS need 30-50 hrs to really shine - not to mention the adapters - I am pretty confident that all will be (more than) well very soon. Soundstage certainly does develop, and all those other qualities you mentioned integrate to an astonishing degree...have no fear, mon ami...

 

BTW - what powers are you using? My Psvanes are providing wonderful 3-dimensionality - could almost swear it's 4 dimensions! But the Sylvania 6SN7GT-VT231s, good though they are, cannot compete in this area especially.

 

Look forward to hearing how things progress...and I make this promise...if that soundstage does not open up (but I am sure it will), I shall make you some silver wire adapters...gladly...

 

Cheers!

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