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6SN7 Tube Addicts - Page 201

post #3001 of 4223

336 FTW!

 

The Sylvania tubes sounds warmer with a thicker and sweeter midrange to me, smoother sounding; and the mouse ears sound more neutral, SS. I might try the Sylvania for your "V-shaped" headphones DT990, but NO I don't have experience with the Sylvania Bad Boy.

post #3002 of 4223

Thank you for advice, but could you tell me which Sylvania do you refer to?

 

Edit.

Ah, sorry nevermind, I have just noticed that you are talking about "Bad Boy".
What would you say about some VT-231 with DT990, which ones could be good?


Edited by NoMatterWhat - 12/7/12 at 8:50am
post #3003 of 4223
Quote:
Originally Posted by NoMatterWhat View Post

Is a 85$ good deal for Tung-Sol 5998 now? Also, what would you prefer from your experience, Tung-Sol "Bad Boy" or Tung-sol mouse ears? I want to pair it with La Figaro 336C and my "V-shaped" headphones DT990.
I actually have a pair of NOS 5998 on their way to me from the states and exactly 85usd a piece..i think its fair pricing.

EDIT: guys i need ur help..while waiting for my 5998 and 5693's a friend of mine is willing to sell me his collection of tubes they are all matched NOS sets and

for the drivers he wants 50 euro per pair and for the powertubes he wants 70

This is what he has for me..i can buy each pair seperately also


nos in box matchet pairs : power Rca 6as7G uit 1953
Ge 6as7g
chatham 6as7G

signal: silvania 6sj7gt (metal base mesh plate)
philips 6sj7wgt (metal base mesh plate)
philips miniwatt 6sj7gt (made by mullard) mesh plate
rca 5693 (red hot!)

signal used but tested 80% + rca 6sj7
ken rad 6sj7
ge 6sj7

Can u pls advice which ones are worth to buy

Thanks guys ur the best!
Edited by hifimanrookie - 12/8/12 at 12:24pm
post #3004 of 4223

I swear I had to wait an eternity for this adapter to arrive but 6F8G tubes are pretty good!

 

700

post #3005 of 4223
Thread Starter 

The RCA 6F8G 50's version is a super tube!

 

Enjoy it!

post #3006 of 4223

Stavros, gives us a quick run down on the various 6F8Gs.

post #3007 of 4223

Cary SLP 05 Preamp - Mixing Phase Splitter 6SN7 Tubes


After a long trial and error process (also replacing the power cord with a Sablon Audio Robusto), I may have arrived at the combination of 6SN7 tubes that work best in my system. It has taken a long long time and I would like to thank many of the guys here who helped with their comments.

What I ended up with is:

Tubes 1 & 2 (the front two tubes from the left)(L & R channel positive phase gain – buffers) - RCA Grey Glass 6SN7 GT

Tubes 4 & 5 (the back two tubes from the left)(L & R channel negative phase gain – buffers) - National Union Black Glass 6SN7 GT

Tubes 3 & 6 (the front and back tubes on the third column from the left)(L & R channel balanced input buffers) - RCA Grey Glass 6SN7 GT

My question now is can I mix the phase splitter tube pairs with different brands as I have so that the positive phase gain tubes are one brand and the negative phase gain tubes are another? I like these results the best so far except for some sibilance in the treble which I didn't have when I used the same brand ie. all RCA Grey Glass. Is this damaging?

Occasionally, the sibilance sounds like minor clipping but this cannot be the result of insufficient current driving the speakers because there is plenty to spare.

Thanks

post #3008 of 4223
Thread Starter 

OK.

 

From what I remember TS come in three plate types Flat, Round and Oval.

 

I like the NU and Raytheon Round plates (not the same round plates as TS).

Some say the NU are noisy.

 

The Sylvania come with T-plates and the RCA and Ken-Rad with Flat plates.

 

If I had to pick one 6F8G it would be the RCA as a cheap all round nice sounding tube. 

 

I have posted photos of the different types earlier on in the thread, but can do so again.

post #3009 of 4223
It wouldn't be the brand that would be the issue. It would be how well matched the tubes all are. If their transconductance was all identical, then eclectically the circuit cares not about the brand. That's not to say there are not sonic differences, but not that wold cause the SLP-05 to misbehave.

BTW great preamp, I love mine wink.gif
post #3010 of 4223

I too own an SLP-05.  Before I try to answer your question I have one for you.  How did you figure out the tube positions and what does what?  I ask because I though each front and back tube were a pair.  From your description it sound like for the first 4 tubes from the left, the front 2 and back 2 are a pair.  And then the 3rd pair is a front and back pair.

post #3011 of 4223
Quote:
Originally Posted by dminches View Post

I too own an SLP-05.  Before I try to answer your question I have one for you.  How did you figure out the tube positions and what does what?  I ask because I though each front and back tube were a pair.  From your description it sound like for the first 4 tubes from the left, the front 2 and back 2 are a pair.  And then the 3rd pair is a front and back pair.


dminches, it's in the manual.

 

700

 

 

1. 6SN7 tube – left channel positive phase gain – buffer
2. 6SN7 tube – right channel positive phase gain – buffer
3. 6SN7 tube – left channel balanced input buffer
4. 6SN7 tube – left channel negative phase gain – buffer
5. 6SN7 tube – right channel negative phase gain – buffer
6. 6SN7 tube – right channel balanced input buffer
7. 6SN7 tube – right channel headphone amplifier
8. 6SN7 tube – left channel headphone amplifier

 

Please correct me if I am wrong but you would use:

 

i) a matched pair for the L & R  + ve phase gain (Tubes 1 & 2) and a matched pair for the L & R - ve phase gain (Tubes 4 & 5)

 

rather than

 

ii) a matched pair for the L channel both + ve & -ve phase gain (Tubes 1 & 4) and a matched pair for the  R channel both + ve & - ve phase gain (Tubes 2 & 5)

 

correct?


Edited by mikey8811 - 12/10/12 at 2:11pm
post #3012 of 4223
Yes. You want the channels to be balanced. That is the important part.
post #3013 of 4223
Quote:
Originally Posted by Skylab View Post

It wouldn't be the brand that would be the issue. It would be how well matched the tubes all are. If their transconductance was all identical, then eclectically the circuit cares not about the brand. That's not to say there are not sonic differences, but not that wold cause the SLP-05 to misbehave.
BTW great preamp, I love mine wink.gif


Hi Skylab

 

The transconductance are close from the high 90's to low 100's. It's just the brands and obviously the constructions are different yielding a different sound.


Edited by mikey8811 - 12/10/12 at 2:16pm
post #3014 of 4223
Thread Starter 

I have found out that the same make & type 6SN7 but of different batch can sound different. 

post #3015 of 4223

Indeed.  They were made by human hands afterall.  There were lots of possibilities for variation from sample to sample, both from the people assembling them and the equipment on the particular line it was coming off of.  Especially the ones from the 40's and early 50's before some of the major processes were automated by machines.

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