[UntilThen]

Last test before I break for lunch. 6SN7 works very well with both 6SN7(S) and 6SN7(P) adapters. Better with the P. I'm only using Foton 6N8S and yet it sounded great.

That means a lot of other double triodes will work too.

6SN7(S)


6SN7(P)

 

[UntilThen]

This came from Eric.

Hi Matt,

I checked 6SN7GT - with 5 W plate dissipation, is OK, Try to use 6SN7(P) to parallel its triodes. It should sound even better....

You can now plug 6J5 directly onto the 6Y6 socket as a power tube, this is similar to using 6SN7 using 6SN7(S) adapter. should be the same sound and same power, same gain.

Enjoy and cheers

Eric

 

[UntilThen]

I'm using Silverstone 6J5 as power tubes directly into Ultimate's 6y6 sockets. Eric is right that this sound just like a 6SN7 using 6SN7(S) adapter - i.e. single triode.

So basically for the Super Ultimate, you can use 6J5 as drivers AND 6J5 as power tubes. Which is what I am doing now except I have GEC rabbit ears in the 6J5 sockets.

 

[crakers7]

I'm using Silverstone 6J5 as power tubes directly into Ultimate's 6y6 sockets. Eric is right that this sound just like a 6SN7 using 6SN7(S) adapter - i.e. single triode.

So basically for the Super Ultimate, you can use 6J5 as drivers AND 6J5 as power tubes. Which is what I am doing now except I have GEC rabbit ears in the 6J5 sockets.

so many options/possibilities will keep me busy/excited for years !!

 

[UntilThen]

Alright @Zachik , I want the spreadsheet updated with all these 'new' power tubes, on my desk by 0700 hours tomorrow.

Oh wait I still have to try 6FD7 after lunch !

 

[UntilThen]

so many options/possibilities will keep me busy/excited for years !!

When you buy Ultimate, you didn't know that you're going down a very deep rabbit hole, did you?

To be honest, I didn't know myself too.

 

[UntilThen]

6BL7 biased at 36mA whereas 6BX7 biased at 51.4 mA

As expected 6BL7 sounded very good too using 6SN7(P) adapters.

 

[UntilThen]

Lunch has not even been digested but I'm rocking with GE 6BL7GTA. This brings back memories of Glenn Super 9 OTL amp using 6 x 6BX7 or 6BL7. However 2 x 6BL7 in Ultimate is more gutsy and powerful than GOTL, and quieter too.

There is no mistaking the 6BX7 or 6BL7 sound. Great tubes and finally they will get some use again in Ultimate.

 

[UntilThen]

I want to acknowledge @g0ldl10n for jogging Eric's memory of his beloved 6EM7 tube and also @triod750 for talking to me about using 6AS7 and 6BX7 in Ultimate as power tubes. 6AS7 is a no go but the other 2 tubes sound great in Ultimate.

Still using 6BL7 and 'Shine On You Crazy Diamond' by Pink Floyd has impact and sound surreal.

Was spending $150 on those adapters worth it? Definitely but it will be the last of adapters for me. I'm leaving you guys to discover more tubes for Ultimate. For now I just want to shine my crazy diamond.

 

[David A Silva]

Alright @Zachik , I want the spreadsheet updated with all these 'new' power tubes, on my desk by 0700 hours tomorrow.

Oh wait I still have to try 6FD7 after lunch !

No wonder I can my keep up with you Matt, you’re always a day ahead of me!

 

[UntilThen]

No wonder I can my keep up with you Matt, you’re always a day ahead of me!

It's 9pm 16th Oct for you now and 3pm for me here 17th Oct. Yeah you're behind time. Going to switch to 6FD7 tubes now.

 

[UntilThen]

With 6FD7, you need 2 adapters. See picture. Biased similar to 6EM7. I was using these tubes as drivers in Eric's 300b amp. Glad I kept them when I sold off the amp. I am getting a pair of 6EW7 tubes of lower mu from Eric.

6EM7, 6FD7, 6BX7 and 6BL7 sound excellent as power tubes in Ultimate. In fact I can experiment using 6EM7 with the lower power section or the higher power section of the dissimilar triodes.

 

[OctavianH]

All these three adapters are applicable for all 6SN7 type (Including 6EM7, 6BX7, 6BL7 etc ) to 6J5 socket. Note that they are to be used in the 6Y6 sockets of Ultimate as power tubes.

What means "all 6SN7 type"? Double triodes?

So for ease of reference, they shall be known as 6EM7 to 6J5 adapter, 6SN7(S) to 6J5 adapter, 6SN7(P) to 6J5 adapter.

This is the pinout of a 6SN7:

From what I understand:

1) 6EM7 -> 6J5 uses Triode 2 (one triode of a double triode)
2) 6SN7(S) -> 6J5 uses Triode 1 (the other half) (one triode of a double triode)
3) 6SN7(P) -> 6J5 uses both triodes in parallel (both triodes of the double triode)

Am I right?

It would be nice to see if a tube in (S) adapter sounds differently than in (P) adapter. Because I expect that in (P) adapter each triode has half current (and both sum in parallel to the one you measure as voltage with your meter). A good part is that you have half plate dissipation for each triode.

Unfortunately 6080 will not work. Biased at 96.6 mV

Expected.

So basically for the Super Ultimate, you can use 6J5 as drivers AND 6J5 as power tubes.

I see you have 18mA on the 6J5 used directly in the power socket. This is ok? 6J5 has 2.5W plate dissipation. Math with Vplate around 200V takes to around 4W.

 

[UntilThen]

What means "all 6SN7 type"? Double triodes?

Yes.

From what I understand:

1) 6EM7 -> 6J5 uses Triode 2 (one triode of a double triode)
2) 6SN7(S) -> 6J5 uses Triode 1 (the other half) (one triode of a double triode)
3) 6SN7(P) -> uses both triodes in parallel (both triodes of the double triode)

Am I right?

It would be nice to see if a tube in (S) adapter sounds differently than in (P) adapter. Because I expect that in (P) adapter each triode has half current (and both sum in parallel to the one you measure as voltage with your meter). A good part is that you have half plate dissipation for each triode.

Yes. 1) 2) 3) precisely.

I did said earlier that 6BX7, 6BL7 and 6SN7 sum in parallel sound better than single triode. I.e 6SN7(P) sound better than 6SN7(S) with these tubes.

6EM7 and 6FD7 has 2 dissimilar parts as you know. One is the driver section and the other the power section. Eric said not to use the driver section as power tubes in Ultimate. I.e. don't use 6EM7 with 6SN7(S) as power tubes in Ultimate but use 6EM7 with the 6EM7 to 6J5 adapters. This info was just communicated to me now.

I see you have 18mA on the 6J5 used directly in the power socket. This is ok? 6J5 has 2.5W plate dissipation. Math with Vplate around 200V takes to to around 4W.

Yes, Eric said ok.

 

[OctavianH]

Yes.

Do not ever try 6SL7 there (1W power dissipation per section). Of course nobody is crazy enough to put mu=70 on output but just saying. And of course, always check datasheet.

Yes. 1) 2) 3) precisely.

Clear, no further questions your honor.

Yes, Eric said ok.

He is the boss. Thanks, very interesting.