[OctavianH]

Can you explain how to check the adapter if pins 1&8 are connected? Which settings and values on the multimeter?
The pins are easy to identify - they are on each side of the ridge on the guidepin.
If they are not connected you can put in a little jumper wire connecting those pins.

Hi mordy,

I was checking continuity with my multimeter. My picture was misleading because I was showing the bottom of the adapter, which is wrong, I should make a picture of the top side. The pinout is this one:

As far as I know, to be able to use EL34 in this adapter the supressor grid (G3) has to be connected to cathode (this is how you strap a pentode to triode).

I checked my adapter as connections are as follows, pin 1 from top of the adapter (6V6) is not connected to anything on the bottom:

This works perfectly for 6V6 (KT66,88 and so on) but for EL34 the pin 1 from top I was expecting to be connected to pin 6 from bottom.
So if we connect pin 1 with pin 8 on the top, pin 8 being connected to pin 6 we are connecting G3 to cathode.

This is how I understand this, if I am wrong please correct me.

 

[mordy]

Hi mordy,

I was checking continuity with my multimeter. My picture was misleading because I was showing the bottom of the adapter, which is wrong, I should make a picture of the top side. The pinout is this one:



As far as I know, to be able to use EL34 in this adapter the supressor grid (G3) has to be connected to cathode (this is how you strap a pentode to triode).

I checked my adapter as connections are as follows, pin 1 from top of the adapter (6V6) is not connected to anything on the bottom:



This works perfectly for 6V6 (KT66,88 and so on) but for EL34 the pin 1 from top I was expecting to be connected to pin 6 from bottom.
So if we connect pin 1 with pin 8 on the top, pin 8 being connected to pin 6 we are connecting G3 to cathode.

This is how I understand this, if I am wrong please correct me.

This is beyond my pay grade - the person to ask is Deyan.

 

[Deyan]

This is beyond my pay grade - the person to ask is Deyan.

First i was making them accept EL34's, then there was a period when i said to myself " if the order is for 6V6, then that's what I'll make"
And for the last 8-10 months I'm again making them accept EL34's.

 

[JTbbb]

But then if you do have unlimited funds, why would you have the Euforia in the first place. Simple math

Hi connieflyer,

First off, no I don’t have unlimited funds! But am interested in your opinion on what might be better than a Euforia AE without spending mega thousands. And of course uses the same type of tubes.

 

[Deleeh]

Why does Lin Lai not make a nice 5998? The market is too small?

Yes i see it too.
Maybe Lin Lai do it in the next month or year i hope.The new 6SN7 Elite Tube are excellent.

 

[LoryWiv]

It's connected on the top. The bottom is imitating 6AS7 the top is the EL34 half.

Thanks @Deyan and @OctavianH. To be completely honest the reason I am double checking if these adapters, which Deyan also made for me, are safe to use is that I did receive EL34's and when in use 1st few days all was well, but after 10-15 hours 1 of the 2 tubes emitted persistent loud crackling, then went silent (although still lit up). The other EL34 remained fine. Switching the "dead" tube to the other adapter / other socket didn't change anything. Since one tube remained fine in the same configuration my conclusion was that I just had a bad tube, not a bad adapter or incompatibility issue in Elise with @Deyan's fine adapters .

Is that the correct conclusion or should I avoid EL34's going forward? Not worth it if it may damage my amp. or headphones to try them again.

 

[LoryWiv]

First i was making them accept EL34's, then there was a period when i said to myself " if the order is for 6V6, then that's what I'll make"
And for the last 8-10 months I'm again making them accept EL34's.

So is it risky to use EL34's in your older adapters?

 

[connieflyer]

I have used kt66, kt77, and knowing 88 as drivers with a quad of kt88 for power. Of the three, I prefer the kt 77 (El 34) as drivers

 

[LoryWiv]

I have used kt66, kt77, and knowing 88 as drivers with a quad of kt88 for power. Of the three, I prefer the kt 77 (El 34) as drivers

Thanks, @connieflyer ... does your adapter have pins 1 / 8 connected and does KT77 have exactly same pin-out as EL34? Trying not to court damage to Elise.

I agree EL34 had some very nice characteristics, sweet mids especially, until the crackle and death of one tube startled me out of my bliss!

 

[OctavianH]

On the EL34, g3 is connected to pin 1, on KT77, it is internally connected to cathode. This is why KT77 works on my adapters.

 

[Deleeh]

Hello,
What is the difference between 6080 and 6080A?
Would the 6080 A or 5998A still work in the Euforia?

 

[mordy]

Hello,
What is the difference between 6080 and 6080A?
Would the 6080 A or 5998A still work in the Euforia?

I am not aware of 6080A, but all the following suffixes are different revisions of the 6080 and all are compatible and interchangeable:
E6080, 6080H, 6080S (These three are French designations; the rest are US designations): 6080WA, 6080WB and 6080WC. Then there are US tubes that are the same or very similar with the designations 6AS7GA and 6AS7GYB.
Add to this European designations of the same tube: UK - CV2984; European - ECC230.
Enjoy the alphabet soup...
6080 and 5998A work fine in the Euforia.
Please note that many 6080 tubes with British and German names are rebranded US tubes; there are forgeries as well - a $5 GE tube will sell for over $100 labeled Telefunken as an example. Some Mullard branded 6080 tubes are made by Sylvania.

 

[Deleeh]

I am not aware of 6080A, but all the following suffixes are different revisions of the 6080 and all are compatible and interchangeable:
E6080, 6080H, 6080S (These three are French designations; the rest are US designations): 6080WA, 6080WB and 6080WC. Then there are US tubes that are the same or very similar with the designations 6AS7GA and 6AS7GYB.
Add to this European designations of the same tube: UK - CV2984; European - ECC230.
Enjoy the alphabet soup...
6080 and 5998A work fine in the Euforia.
Please note that many 6080 tubes with British and German names are rebranded US tubes; there are forgeries as well - a $5 GE tube will sell for over $100 labeled Telefunken as an example. Some Mullard branded 6080 tubes are made by Sylvania.

Okay
Super many thanks.
On warfordvalves there is the 6As7GA
https://www.watfordvalves.com/product_detail.asp?id=158

I was originally going to order these with the 6080 from General Electric.
I found another site where they sell the General Electric and Sylvania 6080 for 10$ a piece and another 5998A for 30$ a piece.
Seems fair to me to be priced.

Whether it brings against the current 6080 Mullard and Brimar tubes where I have there again what I would have to test.
I would prefer another set of Mullard and Brimar for a rainy day.
Where the Brimar there is not so and is supposed to be a Sylvania.
From the feeling would be the 5998A interesting.

 

[mordy]

Okay
Super many thanks.
On warfordvalves there is the 6As7GA
https://www.watfordvalves.com/product_detail.asp?id=158

I was originally going to order these with the 6080 from General Electric.
I found another site where they sell the General Electric and Sylvania 6080 for 10$ a piece and another 5998A for 30$ a piece.
Seems fair to me to be priced.

Whether it brings against the current 6080 Mullard and Brimar tubes where I have there again what I would have to test.
I would prefer another set of Mullard and Brimar for a rainy day.
Where the Brimar there is not so and is supposed to be a Sylvania.
From the feeling would be the 5998A interesting.

From what I read the best sounding 5998A is labeled Gold Aero, but Gold Aero was a rebrander, and I don't know who manufactured the tubes - could be that it varied.
Sylvania 6080 are very good sounding tubes.
GE tubes in general, do not get much love....

 

[connieflyer]

I have heard that about the Gold Aero also. It seems to me, I had heard years ago they were TS. Like them very much with the Gold Aero 6SN7's