[Deleeh]

I find it strange that the getter is broken.
I wouldn't use it again.
It's a real shame that you can't put such a noble construction back into new glass.
I'm really sorry for you, I hope you can find another one at a good price if you like it.

 

[crakers7]

I find it strange that the getter is broken.
I wouldn't use it again.
It's a real shame that you can't put such a noble construction back into new glass.
I'm really sorry for you, I hope you can find another one at a good price if you like it.

I Definitely won't be using it again ,
yes its a real expensive shame , I will keep an eye out for another one

 

[rollinbr]

Thank you Matt. I have a pair of 6SN7(P) to 6J5 adapters so i can use 6BX7 and 6BL7 as power tubes right?.

No I think Eric meant using 6SN7(S)… use only one of the triodes.

Hai,

It gets confusing really fast on the 6SN7(P) to 6J5 adapter and 6SN7(S) to 6J5 adapter and where and when to use each one. Look back through these posts and it is the 6SN7(S) to 6J5 adapter to use a tube in the 6J5 driver slot.

 

[UntilThen]

My GEC A2900 stopped producing sound to one channel, after looking at it closely it looks like the ring getter has broken off , not sure if this is how they all look or if it has broken? Anyone with same tube can you have a look and tell me how yours looks

The getter ring looks broken to me. See my picture of my GEC A2900.

The getter ring has no effect on the sound but it can be dangerous if it comes into contact between 2 element wires, as explained by Bcowen. You get a dead short.

 

[UntilThen]

Hai,

It gets confusing really fast on the 6SN7(P) to 6J5 adapter and 6SN7(S) to 6J5 adapter and where and when to use each one. Look back through these posts and it is the 6SN7(S) to 6J5 adapter to use a tube in the 6J5 driver slot.

I'm in talks with Eric about using 6BX7, 6BL7 or 6EM7 as drivers in the new 5 volt amps - i.e. yours and Hai's.

I may have some good news for you guys. The versatility of having 2.5A dedicated to the drivers is starting to show.

Hang on tight.

 

[UntilThen]

Meanwhile I'm running with GEC A2900 and GEC KT66. Nothing in the textbook says you can't use the same brand driver and power tubes or that it has benefits but 'by George', my Grado GH1 has never sounded better with this combination.

I've been out all morning and only now did I get a chance to sample this aphrodisiac. I don't know about you but what I hear is equally as important as what I eat for the day. What I see is not so important. I could be as happy as Stevie Wonders. You ever see Stevie Wonders sing? He's so happy when he sings.

 

[UntilThen]

Alrighty.... what you see in Zachi's list (that's what I told him) regarding 6EM7(P), 6SN7(P) and 6SN7(S) adapters is for the standard 6 volt UltimatE as power tubes. You can't use 6EM7 with 6SN7(S) in the 6J5 sockets - that will exceed the 1A for driver tubes.

Now for Hai's UltimatE with 5 volt rectifier and Bryant's SupremE with 5 volt rectifier, they are allowed up to 2.5A for the drivers. Here's what they can use regarding 6BX7, 6BL7 and 6EM7 as drivers in their amps:-

6BX7 and 6BL7 can just insert into the 6SL7 slot without adapter. It will work. Or you can use 6BX7 or 6BL7 using 6SN7(P) or 6SN7(S) or 6EM7(P) in the 6J5 slots. So you can compare one 6BX7 in the 6SL7 slot or 2 x 6BX7 using 6SN7(P) in the 6J5 slots. See which sound better or are they the same.

6EM7 as driver:-

The lower mu of 6EM7 is 5, too low as driver and the plate current is high - not recommended to use this section for driver.
The high mu = 68 of 6EM7 (Also 6FD7, 6DR7) similar to a 6SL7 - can be used as a driver, use the 6SN7(S) adapter. If you have a 6FD7 / 6CY7 adapter for the 6EM7, then you can use the lower mu = 17 6EW7, 6DE7 with the 6SN7(S) adapter.

Theoretically you can stick a 6EM7 in the 6SL7 slot but because they are dissimilar triodes with a low and high mu section, you will get dissimilar left and right channel.

 

[crakers7]

@UntilThen Just wondering what your opinion is on the best sounding KT88/6550 tube ? Apart from the GEC KT88 because they are getting ridiculous $$$ .
I have found some NOS tung sol and Svetlana for not too bad price , not sure what to get . Cheers for any advice

 

[UntilThen]

@UntilThen Just wondering what your opinion is on the best sounding KT88/6550 tube ? Apart from the GEC KT88 because they are getting ridiculous $$$ .
I have found some NOS tung sol and Svetlana for not too bad price , not sure what to get . Cheers for any advice

Tung Sol 6550 NOS are good. I've heard good things about Svetlana 6550 NOS. We're talking new old stocks, not the russian more recent production.

For KT88, if not GEC KT88, my recommendation is Psvane KT88 Tii. I've not sampled KR Audio KT88.

 

[crakers7]

Tung Sol 6550 NOS are good. I've heard good things about Svetlana 6550 NOS. We're talking new old stocks, not the russian more recent production.

For KT88, if not GEC KT88, my recommendation is Psvane KT88 Tii. I've not sampled KR Audio KT88.

OK , Thanks

 

[albertmuc]

my recommendation is Psvane KT88 Tii.

Psvane KT88 Tii vs Telefunken 12 Spez vs RT EL39

 

[UntilThen]

Psvane KT88 Tii vs Telefunken 12 Spez vs RT EL39

All 3 are desirable and different sound signature. On a scale of neutral to warm, it's KT88 > EL12 spez > EL39.

 

[triod750]

Alrighty.... what you see in Zachi's list (that's what I told him) regarding 6EM7(P), 6SN7(P) and 6SN7(S) adapters is for the standard 6 volt UltimatE as power tubes. You can't use 6EM7 with 6SN7(S) in the 6J5 sockets - that will exceed the 1A for driver tubes.

Now for Hai's UltimatE with 5 volt rectifier and Bryant's SupremE with 5 volt rectifier, they are allowed up to 2.5A for the drivers. Here's what they can use regarding 6BX7, 6BL7 and 6EM7 as drivers in their amps:-

6BX7 and 6BL7 can just insert into the 6SL7 slot without adapter. It will work. Or you can use 6BX7 or 6BL7 using 6SN7(P) or 6SN7(S) or 6EM7(P) in the 6J5 slots. So you can compare one 6BX7 in the 6SL7 slot or 2 x 6BX7 using 6SN7(P) in the 6J5 slots. See which sound better or are they the same.

6EM7 as driver:-

The lower mu of 6EM7 is 5, too low as driver and the plate current is high - not recommended to use this section for driver.
The high mu = 68 of 6EM7 (Also 6FD7, 6DR7) similar to a 6SL7 - can be used as a driver, use the 6SN7(S) adapter. If you have a 6FD7 / 6CY7 adapter for the 6EM7, then you can use the lower mu = 17 6EW7, 6DE7 with the 6SN7(S) adapter.

Theoretically you can stick a 6EM7 in the 6SL7 slot but because they are dissimilar triodes with a low and high mu section, you will get dissimilar left and right channel.

If you use EZ80 as rectifier that uses 0,6 Ah for the heaters you can try 6BX7/6BL7 (1.5 Ah) as input tube in the 6SL7 slot or via adapter in the 12A*7 slot using 2.1Ah heater current that should be within the 10% limit. If you do this I would expect that you quickly found out that you have much better input tubes. How would I know? Well...
http://www.r-type.org/exhib/acd0009.htm

 

[Wes S]

Meanwhile I'm running with GEC A2900 and GEC KT66. Nothing in the textbook says you can't use the same brand driver and power tubes or that it has benefits but 'by George', my Grado GH1 has never sounded better with this combination.

I've been out all morning and only now did I get a chance to sample this aphrodisiac. I don't know about you but what I hear is equally as important as what I eat for the day. What I see is not so important. I could be as happy as Stevie Wonders. You ever see Stevie Wonders sing? He's so happy when he sings.

Where are the CV1135 and U709, for an all out GEC experience? You know what they say, you can never have too much . . .

 

[VanHai]

Now for Hai's UltimatE with 5 volt rectifier and Bryant's SupremE with 5 volt rectifier, they are allowed up to 2.5A for the drivers. Here's what they can use regarding 6BX7, 6BL7 and 6EM7 as drivers in their amps:-

6BX7 and 6BL7 can just insert into the 6SL7 slot without adapter. It will work. Or you can use 6BX7 or 6BL7 using 6SN7(P) or 6SN7(S) or 6EM7(P) in the 6J5 slots. So you can compare one 6BX7 in the 6SL7 slot or 2 x 6BX7 using 6SN7(P) in the 6J5 slots. See which sound better or are they the same.

Hi Matt, so I know now that my amp can use 6BX7 and 6BL7 using 6SN7 (P) to 6J5 sockets as driver tubes. Can I use them with the same adapters to 6v6 sockets as power tubes like the 6v amp? It is crazy, there are so many options that make my head spinning.