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Jan 21, 2018 at 9:37 PM Post #3,961 of 9,562
I am pretty sure that the Chatham 6520 and 6AS7G are identical. Those who hear sonic differences are likely hearing differences due to the the tubes being manufactured at different times. A 6520 and 6AS7G manufactured at the same time should sound identical.

As attmci suggests, chasing after a 5998 might be a better idea.
 
Jan 21, 2018 at 9:57 PM Post #3,962 of 9,562
gibosi said:
I am pretty sure that the Chatham 6520 and 6AS7G are identical. Those who hear sonic differences are likely hearing differences due to the the tubes being manufactured at different times. A 6520 and 6AS7G manufactured at the same time should sound identical.

As attmci suggests, chasing after a 5998 might be a better idea.
Click to expand...

Great, thanks for your input. I have a set of 5998's as well which are great, but I do enjoy the warmer tilt the TS 6AS7G's provide. If the 6520 were to have a similar tonal shift but with better air/clarity, I would have been very interested, but it sounds like that may not be the case.

And thank you @attmci for your thoughts, if I come across a 6520 with domino plates and decide to pick it up, I will most definitely share my comparison here :wink:

Much appreciated!
 
Jan 29, 2018 at 1:04 PM Post #3,965 of 9,562
Hi, Please help me to identify this 5998A tube:

https://www.ebay.com/itm/5998-SYLVA...218431?hash=item33e0c328bf:g:PPwAAOSwjqVZEy2m

Is this a real 5998A or it is just a 6AS7GA?

Its plates looks like a regular 6AS7GA, but the seller claims it is actually a 5998A which is supposedly to be better than a 6AS7GA.

Thanks

Here some pictures of this tube:

s-l1600.jpg


s-l1600.jpg


s-l1600.jpg
 
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Jan 29, 2018 at 2:52 PM Post #3,966 of 9,562
On my La Figaro 339 I have the RCAs and Chatham...for my Atticus I prefer the cleaner,detailed and better staging of the Chatam,but im losing quite a bit of bass slam vs. the RCAs...Is the happy medium grabbing a pair of 5998s,and if so what is a fair price for a pair,or is there something else entirely for clean heavy slam+staging+3D imaging?
 
Jan 29, 2018 at 4:39 PM Post #3,967 of 9,562
Jan 29, 2018 at 4:58 PM Post #3,968 of 9,562
The Tung Sol 5998 will have domino plates...like this.
DSC00086.JPG
 
Jan 29, 2018 at 5:19 PM Post #3,969 of 9,562
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Jan 29, 2018 at 6:20 PM Post #3,970 of 9,562
wwmhf said:
Attmci and whirlwind,

I fully understand that the tube am interested in is not Tung Sol 5998, not even close.

My concern is how this 5998A tube is related to the 6AS7GA we all know. Is it just a 6AS7GA? It looks very just like another 6AS7GA to me.

Again, here is the link to the 5998A tube I am talking about:

https://www.ebay.com/itm/5998-SYLVA...218431?hash=item33e0c328bf:g:pPwAAOSwjqVZEy2m
Click to expand...

They should sound very similar (if not the same) in a typical amp application. The 5998A gives higher operating limits (e.g. plate voltage/ current and amplification gain) but must be provisioned/ designed to take advantage of those factors (e.g. 6as7 to 5998 bias switch.) The construction of the 6AS7GA and 5998A is very similar as opposed to the 6AS7G and 5998 (domino plate) versions which (IMHO) greatly affects the sound.
 
Jan 29, 2018 at 7:17 PM Post #3,971 of 9,562
Is there any difference in sound between Sylvania 5998A and GE 5998A - the construction seems to be a little different.
I seem to remember another brand of 5998A - Gold Aero.
Never bothered to buy these since I was under the impression that they sound like the 6AS7G....
 
Jan 29, 2018 at 7:46 PM Post #3,973 of 9,562
ru4music said:
They should sound very similar (if not the same) in a typical amp application. The 5998A gives higher operating limits (e.g. plate voltage/ current and amplification gain) but must be provisioned/ designed to take advantage of those factors (e.g. 6as7 to 5998 bias switch.) The construction of the 6AS7GA and 5998A is very similar as opposed to the 6AS7G and 5998 (domino plate) versions which (IMHO) greatly affects the sound.
Click to expand...

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?
 
Jan 29, 2018 at 7:47 PM Post #3,974 of 9,562
wwmhf said:
Hi, Please help me to identify this 5998A tube:

https://www.ebay.com/itm/5998-SYLVA...218431?hash=item33e0c328bf:g:PPwAAOSwjqVZEy2m

Is this a real 5998A or it is just a 6AS7GA?

Its plates looks like a regular 6AS7GA, but the seller claims it is actually a 5998A which is supposedly to be better than a 6AS7GA.

Thanks

Here some pictures of this tube:

s-l1600.jpg


s-l1600.jpg


s-l1600.jpg
Click to expand...
I've been interested in getting a pair of these too, and from this seller, only thing putting me off was the construction looking very similar to the 6AS7GA. Still not sure.
 
Jan 29, 2018 at 8:58 PM Post #3,975 of 9,562
wwmhf said:
Attmci and whirlwind,

I fully understand that the tube I am interested in is not Tung Sol 5998, not even close.

My concern is how this 5998A tube is related to the 6AS7GA we all know. Is it just a 6AS7GA? It looks very just like another 6AS7GA to me.

Again, here is the link to the 5998A tube I am talking about:

https://www.ebay.com/itm/5998-SYLVA...218431?hash=item33e0c328bf:g:pPwAAOSwjqVZEy2m
Click to expand...
No, they are different. The major difference: 5998A has higher transconductance than 6as7g (15500 vs 7000 umhos).
 
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