[attmci]

This is also another related question of mine, i.e., how similar are Sylvania 5998A and GE 5998A?

Do you expect a RCA 6080 can replace a Bendix 6080WB? Yup, technically , it can. But.................

 

[ru4music]

This requirement on circuit in order for 5998A to perform optimally makes sense to me if this 5998A is really different from 6AS7GA. Hence, a further question is: Can this Sylvania 5998A perform better than 6AS7GA/6080 in amp such as Darkvoice 336SE?

My understanding is that Darkvoice 336SE is designed for 6AS7G/6AS7GA/6080. Is it designed to be able to take advantage of Sylvania 5998A if Sylvania 5998A has the potential to be better than 6AS7G/6AS7GA/6080?

No! Please let me make this clear if there is any misunderstanding... NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO!!!!!!

But it will perform equally satisfactorily as a 6AS7GA/6080.

 

[wwmhf]

Thanks for the inputs/comments/clarifications.

So for the Darkvoice 336, this Sylvania 5998A will act just like a usual 6AS7GA/6080, maybe a good one.

This makes me wondering about modifying the Darkvoice 336 for taking advantage of the potential in this Sylvania 5998A. Is this possible?

 

[dobigstuff]

This requirement on circuit in order for 5998A to perform optimally makes sense to me if this 5998A is really different from 6AS7GA. Hence, a further question is: Can this Sylvania 5998A perform better than 6AS7GA/6080 in amp such as Darkvoice 336SE?

My understanding is that Darkvoice 336SE is designed for 6AS7G/6AS7GA/6080. Is it designed to be able to take advantage of Sylvania 5998A if Sylvania 5998A has the potential to be better than 6AS7G/6AS7GA/6080?

wwmhf:

I have used that Sylvania 5998A Tube in my Darkvoice (see below) It sounds great. However the Best Power Tube for me is the NOS Western Electric 421 A (Driver is always the NOS Tung-Sol 6SN7

 

[gibosi]

Thanks for the inputs/comments/clarifications.

So for the Darkvoice 336, this Sylvania 5998A will act just like a usual 6AS7GA/6080, maybe a good one.

This makes me wondering about modifying the Darkvoice 336 for taking advantage of the potential in this Sylvania 5998A. Is this possible?

Of course it is possible. You would simply need to change the bias resistors. But probably it is not a good idea. While a 5998 works very well in a circuit designed for 6AS7, all of your 6AS7, 6080 and similar tubes will likely sound worse in a circuit designed for the 5998....

If you really want to go down this road, the best solution is to design and build two biasing circuits, one for 5998 and one for 6AS7, with a toggle switch.

 

[wwmhf]

wwmhf:
I have used that Sylvania 5998A Tube in my Darkvoice (see below) It sounds great. However the Best Power Tube for me is the NOS Western Electric 421 A (Driver is always the NOS Tung-Sol 6SN7

Glad to know this Sylvania 5998A sounds good in Darkvoice 336SE.

 

[wwmhf]

Of course it is possible. You would simply need to change the bias resistors. But probably it is not a good idea. While a 5998 works very well in a circuit designed for 6AS7, all of your 6AS7, 6080 and similar tubes will likely sound worse in a circuit designed for the 5998....

If you really want to go down this road, the best solution is to design and build two biasing circuits, one for 5998 and one for 6AS7, with a toggle switch.

Great idea, and this gives me another motivation to clone a Darkvoice 336SE.

 

[Oskari]

I seem to remember another brand of 5998A - Gold Aero.

Gold Aero was not a tube manufacturer. Those will be relabeled tubes.

 

[mordy]

Gold Aero was not a tube manufacturer. Those will be relabeled tubes.

Do you know who made them? GE? Sylvania?

 

[Oskari]

Do you know who made them? GE? Sylvania?

Those 5998As I've seen photos of, have been GE, I think.

 

[L0rdGwyn]

Oh man just scored a strong 1963 D getter Western Electric 421a for $125 on eBay my first! Psyched to try it in my BH Crack, but at the same time worried it will ruin my Tung Sol 5998's

 

[mordy]

Oh man just scored a strong 1963 D getter Western Electric 421a for $125 on eBay my first! Psyched to try it in my BH Crack, but at the same time worried it will ruin my Tung Sol 5998's

Hi L0G,

Please try it, curious to hear if there are differences - thanks.

 

[Scutey]

Oh man just scored a strong 1963 D getter Western Electric 421a for $125 on eBay my first! Psyched to try it in my BH Crack, but at the same time worried it will ruin my Tung Sol 5998's

Congrats, I'm jealous!

 

[L0rdGwyn]

Hi L0G,

Please try it, curious to hear if there are differences - thanks.

Will do! When I get it, I'll post some subjective comparisons with the Tung Sol 5998 here.

Congrats, I'm jealous!

Thanks! Been quietly watching Ebay for a while, waiting for a good deal on one. Finally paid off.

 

[Scutey]

Will do! When I get it, I'll post some subjective comparisons with the Tung Sol 5998 here.



Thanks! Been quietly watching Ebay for a while, waiting for a good deal on one. Finally paid off.

Patience always pays off eventually, it's worked for me, good things come to those who wait!.