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Little Dot Tube Amps: Vacuum Tube Rolling Guide - Page 444

post #6646 of 10574

Hi Rossliew,

 

From what I read the red base RCA were hyped up by a retailer that had a lot of them, and as Gibosi mentions, a lot of people don't think that they are special at all. Since we do not have any preconceived ideas on this forum what is the best sound, we can perhaps look or listen more objectively.

 

I ordered several lots of 6SN7 tubes when the price was right in order to become familiar with them. Any 60's Sylvania 6SN7GTB sounds very good, and also RCA 6SN7GT tubes with a little horizontal heater wire on top of the top mica. These tubes can be found for $5 or less with a little patience. In addition, these tubes are long lived - 10,000 hours, and so far I have not bought any that did not work. They are very simple to use - just plug and play.

 

Tried a couple of inexpensive Russian tubes, but in the long run I find that I am always coming back to US made tubes as better sounding, at least to me.


Edited by mordy - 6/23/14 at 10:06am
post #6647 of 10574

Although there certainly had been interest before on the special red tubes (especially from Asia and MFA) but I remember the hype going into over drive with the Joe Roberts? article on red bank tubes for issue 3 of Sound Practices magazine (1993 I think). Prices went silly after that with people thinking they were the best made tubes available, little did they know about Bendix! Nice tube, wrong price.

post #6648 of 10574

Oh, it's a great tube...

 

If you need it for your artillery computer.

 

;)

post #6649 of 10574

The 6832 "insures optimum performance in guided missiles" according to the Raytheon manual.

post #6650 of 10574

Hej, mordy! These pages explain why the Swedish version of the 5692 exists:

 

 

The rest of you might need:

 

post #6651 of 10574
Quote:
Originally Posted by mordy View Post
 

Hi Rossliew,

 

From what I read the red base RCA were hyped up by a retailer that had a lot of them, and as Gibosi mentions, a lot of people don't think that they are special at all. Since we do not have any preconceived ideas on this forum what is the best sound, we can perhaps look or listen more objectively.

 

I ordered several lots of 6SN7 tubes when the price was right in order to become familiar with them. Any 60's Sylvania 6SN7GTB sounds very good, and also RCA 6SN7GT tubes with a little horizontal heater wire on top of the top mica. These tubes can be found for $5 or less with a little patience. In addition, these tubes are long lived - 10,000 hours, and so far I have not bought any that did not work. They are very simple to use - just plug and play.

 

Tried a couple of inexpensive Russian tubes, but in the long run I find that I am always coming back to US made tubes as better sounding, at least to me.

 

HI Mordy,

 

I only have 2 pairs of 6SN7s and so far, they are serving me well. I would like to explore other tube types like the 6f8g (they look good!) and C3gs and see how they fare. Tempted with the 6SL7s but afraid of the complexity involved in building the adaptor and external PSU. 

 

Having said that, I may just buy another couple of pairs of 6SN7s just for experimentation : )

post #6652 of 10574

The 6SL7 tubes are just plug and play exactly like the 6SN7 and don't need any external PS. IMHO they sound a little lightweight in the bass compared to the 6SN7 tubes when used as power tubes, but still very nice sounding - a light and elegant sound if you will...

post #6653 of 10574

Hi Oskari,

 

Thanks for the interesting Swedish vacuum tube history. Wonder if the rubber mounted sockets would make a difference in audiophile applications - sometimes I play recordings with cannon shots....

post #6654 of 10574
Quote:
Originally Posted by mordy View Post
 

The 6SL7 tubes are just plug and play exactly like the 6SN7 and don't need any external PS. IMHO they sound a little lightweight in the bass compared to the 6SN7 tubes when used as power tubes, but still very nice sounding - a light and elegant sound if you will...

Hmm...this is interesting. Is the adaptor the same as the one used with 6SN7 tubes?

 

On another note, after some experimentation, I found the 6SN7+6HM5 combo to be slightly veiled with my HD600. Edges were softer leading to an overall smothered kinda sound.

post #6655 of 10574

These sound like a good deal...plug and play?

 

http://www.ebay.com/itm/Lot-of-4-6N9S-6H9C-6SL7-1579-Russian-Double-Triode-Tubes-NOS-NIB-Tested-/141324377412?pt=Vintage_Electronics_R2&hash=item20e796dd44

post #6656 of 10574

I think we all have a quad of 6H9C's here, they are a decent tube for the price, 6SL7 compatible so no external supply required.

post #6657 of 10574
Quote:
Originally Posted by TrollDragon View Post
 

I think we all have a quad of 6H9C's here, they are a decent tube for the price, 6SL7 compatible so no external supply required.

Thanks, TD.

 

So, can I confirm I can use these tubes with the present 6SN7 adaptors?

post #6658 of 10574
Quote:
Originally Posted by Rossliew View Post
 

Thanks, TD.

 

So, can I confirm I can use these tubes with the present 6SN7 adaptors?

They will work perfectly in your 6SN7 adapters but the tubes have a gain of 70 vs 20 and much higher plate resistance, so I don't know how they will fare as power tubes. I have used a single tube as a driver before with good results.

.

post #6659 of 10574
Quote:
Originally Posted by TrollDragon View Post
 

They will work perfectly in your 6SN7 adapters but the tubes have a gain of 70 vs 20 and much higher plate resistance, so I don't know how they will fare as power tubes. I have used a single tube as a driver before with good results.

.

Hmm....then using 2 tubes as power tubes may blow my LD3 to smithereens?

post #6660 of 10574
I dont think that will happen, others have tried them as power tubes before if you search back through the thread.
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