[UntilThen]

Yes Monster, start with the tubes Glenn gave you first. I know you are new to these so don't be afraid to ask questions.

Now just use Glenn's supplied tubes and start listening. It should be a good start.

It's a really beautiful looking amp. Congrats.

 

[mordy]

Yes Monster, start with the tubes Glenn gave you first. I know you are new to these so don't be afraid to ask questions.

Now just use Glenn's supplied tubes and start listening. It should be a good start.

It's a really beautiful looking amp. Congrats.

Congrats on the new amp!

 

[UntilThen]

Monster after you have listen to the 'stock' tubes for a while and when you are ready to experiment - which I hope in at least a few days time, this is what you do:-

You can put a 12au7 or 12ax7 in the adapter, then replace the 25sn7 tube with it.

Set the back switch to 6.3 volt.

All the others tubes stay as is.

... and power on.

So basically you can use 25sn7 or 12au7 as drivers. Just set the back switch accordingly.

 

[UntilThen]

Are we getting music yet???

 

[Monsterzero]

Hooray!!! Plugged it in and nothing exploded! Trying it out on my HD6xx(so if it did explode id only be out 200.00 )

Will try my Atticus after the tubes are warmed...rockin a 24/96 version of L.A. Woman.... Oh that separation,and the bass is super tight!!!
I cant wait to try out some different tube rolls!

 

[rnros]

@Monsterzero Definitely listen to the tubes you have now... Immediately!
Think you will be surprised how good the sound is. : )

Yeah, the C3g will be another surprise whenever you get those.

Haven't heard the Telefunken 12AU7 yet, I'm sure it's very good.
That said, I have yet to hear a 9 pin tube that competes with the larger tubes for soundstage projection.
The RCA clear top 12AU7 and 12AX7 are a couple of the better 9 pin tubes I've heard.
So, lots of promise in that group, haven't ventured into the Euro brands yet.
But, still have my doubts that any will match the larger tubes I've heard.
I have that same adapter. Set the V selector for 6V. That adapter runs the heaters in parallel at 6V/300mA.

 

[Monsterzero]

I have that same adapter. Set the V selector for 6V.

Thank you sir!

 

[UntilThen]

Congrats again Monster. Go slow on tube rolling. Don't wear out the sockets.

Enjoy!

 

[Monsterzero]

Monster after you have listen to the 'stock' tubes for a while and when you are ready to experiment - which I hope in at least a few days time, this is what you do:-

You can put a 12au7 or 12ax7 in the adapter, then replace the 25sn7 tube with it.

Set the back switch to 6.3 volt.

All the others tubes stay as is.

... and power on.

So basically you can use 25sn7 or 12au7 as drivers. Just set the back switch accordingly.

Great thanks so much... So im running the two power tubes that Glenn provided. Adding two (or four) more will have what benefit? more volume/impact,or?
Also is it a no-no to mix 2 power tubes of one brand with 2 or 4 more of a different maker? Thinking of scavenging my La Figaro 339 tubes (2 Chathams and 2 RCAs)

 

[mordy]

Great thanks so much... So im running the two power tubes that Glenn provided. Adding two (or four) more will have what benefit? more volume/impact,or?
Also is it a no-no to mix 2 power tubes of one brand with 2 or 4 more of a different maker? Thinking of scavenging my La Figaro 339 tubes (2 Chathams and 2 RCAs)

No harm in mixing tubes - you have to determine if it sounds better. You can only use up to 4 x 2.5A power tubes such as the Chatham/RCA 6080/6AS7 in the GOTL.

 

[rnros]

Also is it a no-no to mix 2 power tubes of one brand with 2 or 4 more of a different maker? Thinking of scavenging my La Figaro 339 tubes (2 Chathams and 2 RCAs)

Yes, do that, no problem mixing brands, but you are limited to 2 pairs of 6AS7Gs. Has to do with heater current limitation.

 

[leftside]

Yep have that dialed in...
For my first tube set I want to build around a Telefunken 12au7,cuz I love the detailed mids of that tube. I purchased an adapter for it

@Monsterzero Definitely listen to the tubes you have now... Immediately!
Think you will be surprised how good the sound is. : )

Yeah, the C3g will be another surprise whenever you get those.

Haven't heard the Telefunken 12AU7 yet, I'm sure it's very good.
That said, I have yet to hear a 9 pin tube that competes with the larger tubes for soundstage projection.
The RCA clear top 12AU7 and 12AX7 are a couple of the better 9 pin tubes I've heard.
So, lots of promise in that group, haven't ventured into the Euro brands yet.
But, still have my doubts that any will match the larger tubes I've heard.
I have that same adapter. Set the V selector for 6V. That adapter runs the heaters in parallel at 6V/300mA.

I want to know what the amp sounds like with the Telefunken 12au7!

RCA made a lot of different 12au7 and 12ax7. Black plates with square getter from the 1940's are the best. One of the better US brands of those tubes for sure. Nice warmth. I have a slight preference for the Euros though - again earlier the better. Some people will argue the best 12au7s and 12ax7s are better than the best 6SN7s. Some current vendors such as McIntosh only use 12ax7, 12at7, 12au7 (and KT88/6550) tubes.

 

[rnros]

No harm in mixing tubes - you have to determine if it sounds better. You can only use up to 4 x 2.5A power tubes such as the Chatham/RCA 6080/6AS7 in the GOTL.

Hi Mordy, I see we are typing in the same moment... Imagine you are getting close to having your GOTL built.
Or maybe it should be called GLOTL, Glenn Lundhal OTL?

 

[2359glenn]

I have a builtin current limit circuit if the switch is left in the wrong position but it won't work with the little 9 pin tubes.
They will burn out if the switch is left on 12 volt or 25 volt.
With the octal tubes if the switch is left in 12 or 25 the amp will current limit and the pilet light in the switch will go out.

 

[rnros]

RCA made a lot of different 12au7 and 12ax7. Black plates with square getter from the 1940's are the best. One of the better US brands of those tubes for sure. Nice warmth. I have a slight preference for the Euros though - again earlier the better. Some people will argue the best 12au7s and 12ax7s are better than the best 6SN7s. Some current vendors such as McIntosh only use 12ax7, 12at7, 12au7 (and KT88/6550) tubes.

Thanks, I will look for those. No doubt the tube performance also depends on the amp in question.
Lots of spectacular drivers available for GOTL! The better 25/12/6SN7s are very, very good.
But my favorites, in terms of actual play time, are C3g, ECC31, FIVRE 6N7G.
And recently have been listening to the EL3N via the 2fer adapter, and it is outstanding in the GOTL design.
Has me very excited about the GEL3N.