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6SN7 Tube Addicts - Page 178

post #2656 of 4150

Thanks for everyone's response! There's no way I'm going to ship it back, but now I'm rest assured to use the tube :D

post #2657 of 4150
Quote:
Originally Posted by Xcalibur255 View Post


If the glass isn't genuinely loose against the base the tube is still okay Adrian.  The crack won't affecft its performance or lifetime.  I have/had several mouse ear tubes that were like this, it affects a lot of the early 50's tung sol 6SN7s.  If I were you I'd still keep the tube as rosgr63 recommended.

 Anybody know how much a TSRP with a cracked base should be discounted? Say you bought the tube for $200 and the seller missed the crack. How much of a refund should I ask for? I'm testing the tube now; the bulb is firm, and it sounds fine. It's a fairly rare round mica so I want to keep it.

 

I heard many NOS TSRPs have cracked bases. It's due to being hastily pulled off the burn in rack at the factory - by gorillas I presume. Well, it was wartime, so the factory had to churn them out.

post #2658 of 4150

If it isn't noisy then I'd just be glad to have it, and not worry about trying to get a discount on it.  The demand on them is pretty strong against the few remaining supplies.

post #2659 of 4150
Thread Starter 

The Sylvania 6SN7W metal base suffer from base cracks too.

 

BTW Glenn's amp could even handle a 6AS7G as a driver!

 

There is an SP model that can run 12SN7's with an external power supply.

The 12SN7>6SN7 adaptor option is the best as you can still use the 6SN7's.

post #2660 of 4150

I should try that sometime, I wonder how it would sound.  I do think gain would be an issue in that scenario though, going from a mu of 20 to 2.

post #2661 of 4150
Quote:
Originally Posted by rosgr63 View Post

The Sylvania 6SN7W metal base suffer from base cracks too.

 

BTW Glenn's amp could even handle a 6AS7G as a driver!

 

There is an SP model that can run 12SN7's with an external power supply.

The 12SN7>6SN7 adaptor option is the best as you can still use the 6SN7's.

We take it upon your finding this out...you did it. biggrin.gif So, how did it sound with 6AS7G as drive tube?

post #2662 of 4150
Thread Starter 

I think we are loosing the die hard 6SN7's addicts with all these alternatives!

 

Now look at this substitute:

 

 

post #2663 of 4150
Thread Starter 

I don't have my amp yet SO, so I can't say sorry.

post #2664 of 4150
Quote:
Originally Posted by rosgr63 View Post

I don't have my amp yet SO, so I can't say sorry.

Currently in-session with Sade - "Keep Looking" Track time 05:22:05

 

Are you still in the lab taking notes on the 6SN7 killa? I admire your efforts to advance our place in this hobby.


Edited by Silent One - 8/22/12 at 12:56am
post #2665 of 4150
Thread Starter 

Did Sylvania make "Bad Boys" in 1953?

 

This pair has the date code 305.

 

 

post #2666 of 4150

 left overs from 1952 spilling into 1953? Sure looks like BadBoys :)

post #2667 of 4150
Since the only definition of "Bad Boy" is the three holed plate Sylvania, and you have one made on the fifth week of 1953, I would say the answer is yes biggrin.gif
post #2668 of 4150
Thread Starter 

Thanks Rob, they do sound very much like my 1952 vintage Bad Boys, so looks like they were 1952 left overs!

post #2669 of 4150

Seems like I am going to have to start paying more attention to this thread again. My passion for tube rolling has just been revived and I know Rob will see the irony in this but I have put down my name to get an official unit after this past weekends tube frolicking.  #link#

 

so to start - how far off from the bad boys are the new shuguang's ?

 

..dB

post #2670 of 4150
Thread Starter 

I have never tried the Shuguang so I can't say.

I am not keen on new production 6SN7, sorry.

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