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6SN7 Tube Addicts - Page 179

post #2671 of 4299
Yeah I think the Sylvania Bad Boys are in another league versus the Shuggie, Donald. The BT's are OK, but really nothing special, IMO.
post #2672 of 4299
Quote:
Originally Posted by rosgr63 View Post

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

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

no need to be sorry about your passion ;-) 

Quote:
Originally Posted by Skylab View Post

Yeah I think the Sylvania Bad Boys are in another league versus the Shuggie, Donald. The BT's are OK, but really nothing special, IMO.

Thanks Rob , I will start keeping an ear to the ground for some good tubes to roll. The production version of the Liquid Glass is a little way off, so no rush. It might be easier to find the 12SN7 options too. 

 

..dB

post #2673 of 4299
12SN7's certainly will save you some bucks. It's almost insane how you can get 12SN7's that are identical in structure to their 6SN7 counterparts often for as little as 10% of what the 6SN7 would cost.
post #2674 of 4299

What kind of lifespan can one expect from these pricey, rare 6SN7 variants such as Bad Boys or Tungsol round plates? I mean you are paying $150-600/pair and if you run them every day do they crap out in 2-3 years? I've heard of a 10,000 hr military rating but I don't think they will live anywhere near that. What is a realistic operating hour rating for these tubes?

 

I know it depends on the amp and whether the tube is used or how good NOS the tube is, but I always hear of guys owning a coveted tube pair but they never run the tubes in the amp daily or at all!

post #2675 of 4299
Quote:
Originally Posted by rosgr63 View Post

Did Sylvania make "Bad Boys" in 1953?

 

This pair has the date code 305.

 

 


Are your grid posts made of copper or steel?  Those look like steel to me.

post #2676 of 4299
Quote:
Originally Posted by Clevor View Post

What kind of lifespan can one expect from these pricey, rare 6SN7 variants such as Bad Boys or Tungsol round plates? I mean you are paying $150-600/pair and if you run them every day do they crap out in 2-3 years? I've heard of a 10,000 hr military rating but I don't think they will live anywhere near that. What is a realistic operating hour rating for these tubes?

 

I know it depends on the amp and whether the tube is used or how good NOS the tube is, but I always hear of guys owning a coveted tube pair but they never run the tubes in the amp daily or at all!


At nominal plate voltage and current 5,000 hours is realistic from a good tube I would say.  It depends upon the amplifier topology and usage (how much you turn it off and on).  Run conservatively a 6SN7 can very well run 10,000 hours and still give good performance.  Or it could crap out in only a thousand, especially if it develops a short or noise issues.  It just depends.

post #2677 of 4299
Thread Starter 
Quote:
Originally Posted by Clevor View Post

What kind of lifespan can one expect from these pricey, rare 6SN7 variants such as Bad Boys or Tungsol round plates? I mean you are paying $150-600/pair and if you run them every day do they crap out in 2-3 years? I've heard of a 10,000 hr military rating but I don't think they will live anywhere near that. What is a realistic operating hour rating for these tubes?

 

I know it depends on the amp and whether the tube is used or how good NOS the tube is, but I always hear of guys owning a coveted tube pair but they never run the tubes in the amp daily or at all!

 

The prices vary, and you can get a bargain if you know what you are looking for.

I just payed $49 for this matched NOS pair of "Bad Boys" which is not bad for todays prices.

I was lucky though as I have payed a lot more for my other similar pairs.

 

Quote:
Originally Posted by Xcalibur255 View Post


Are your grid posts made of copper or steel?  Those look like steel to me.

 

The photo was desaturated as it had a colour cast.

They are copper posts.

 

Some headphone amps run the tubes conservatively so I would expect them to last for a few years.

Then again tubes are "alive' so they can die develop shorts after a few hours of use.

That's why a refurbished tester with a good shorts circuit is a must.

post #2678 of 4299
Quote:
Originally Posted by rosgr63 View Post

 

The prices vary, and you can get a bargain if you know what you are looking for.

I just payed $49 for this matched NOS pair of "Bad Boys" which is not bad for todays prices.

I was lucky though as I have payed a lot more for my other similar pairs.

 

 

Did you get them on ebay or another random site?

post #2679 of 4299
Thread Starter 

Hi David $49.99 on August 10th, when the ebay God was asleep.

 

Also a nice TS VT229 BGRP and a RCA 6SL7 Smoked Glass for $19.99.

 

Testing the TS as we "speak", Tina Turner never sounded so good!


Edited by rosgr63 - 8/28/12 at 11:17am
post #2680 of 4299

Stavros, nice buys!  I rarely seem to get very good deals.  I don't overpay, but I don't get things for under market value.

 

I also seem to always be looking for pairs which reduces the market size.

post #2681 of 4299
Thread Starter 

I am seldom lucky buying tubes David.

 

You can make nice pairs from singles, but it would take time and patience, very rewarding though.

post #2682 of 4299

Any input on the Raytheon's below?  I'm terrible at ID'ing tubes.....

 

 

post #2683 of 4299

GTBs, circa 1960-ish I would say.  A fast dynamic tube, good quick bass.  I found it a bit peaky and nasal, as I do many Raytheon tubes.  It doesn't have the low level detail of a older vintage GT tube but is good by GTB standards IMO.  They're a great bargain tube as nobody charges much money for them.

post #2684 of 4299
Thread Starter 

Side getter, nice tubes at reasonable prices.

post #2685 of 4299

Gonna shoot another question to you experienced folk.

 

For those 6SN7 tube amps that can also get by with 6F8G tubes, are there any benefits to using them sonically?  They seem to be cheaper than 6SN7s, even when you account for the adapter.

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