[ru4music]

   
Whirlwind's amp has
 
Two loctal C3g sockets
An upgraded transformer requiring different rectifiers
DC heaters (I believe)
A 6/12/25 volt switch for the 6SN7 socket
A 5998/6AS7 switch to provide the correct bias when running 5998
 
Otherwise, they both have two 6AS7 sockets and one 6SN7 socket

From an engineering perspective providing a xSN7 or a  C3g driver option is just KILLER!

 

[gibosi]

  From an engineering perspective providing a xSN7 or a  C3g driver option is just KILLER!

 
Whirlwind has the same amp that I have, except his has the upgraded transformer and DC heaters. That is, his is quieter. But for sure, being able to roll a single 6/12/25 volt double triode or a pair of C3g is awesome.
 
Here running a 12 volt FDD20 with simple pin adapter:
 

 

[jhljhl]

   
Whirlwind has the same amp that I have, except his has the upgraded transformer and DC heaters. That is, his is quieter. But for sure, being able to roll a single 6/12/25 volt double triode or a pair of C3g is awesome.
 
Here running a 12 volt FDD20 with simple pin adapter:
 

Could Glenn do the same setup with 5ar4 compatible rectifier like yours? Or is it that- you can use a pair of c3gs also?

 

[2359glenn]

 

   
Whirlwind has the same amp that I have, except his has the upgraded transformer and DC heaters. That is, his is quieter. But for sure, being able to roll a single 6/12/25 volt double triode or a pair of C3g is awesome.
 
Here running a 12 volt FDD20 with simple pin adapter:
 

Could Glenn do the same setup with 5ar4 compatible rectifier like yours? Or is it that- you can use a pair of c3gs also?

Yes I can use the same transformer as gibosi's.
Actually $300 cheaper than whirlwind's amp.

 

[whirlwind]

 

   
Whirlwind's amp has
 
Two loctal C3g sockets
An upgraded transformer requiring different rectifiers
DC heaters (I believe)
A 6/12/25 volt switch for the 6SN7 socket
A 5998/6AS7 switch to provide the correct bias when running 5998
 
Otherwise, they both have two 6AS7 sockets and one 6SN7 socket

From an engineering perspective providing a xSN7 or a  C3g driver option is just KILLER!

Yes, absolutely.
 
gibosi has rolled so many different tubes in his amp, it is unreal. Seems the tube rolling options are endless
 
I have only rolled about 4 different power tubes so far and like 4 different SN7 tubes......I am all about synergy and head bobbin and feet tappin...that has happened with every combo I have tried.
 
I am not so much trying to find the perfect sound signature, I love the option to have many...what ever suits my mood.
 
So far I have heard Glenns amp being very dynamic across the spectrum, to a very nice and warm sound across the spectrum, while all the time producing the music so effortlessly.

 

[3083joe]

I understand!  Given the right 6DJ8/ 5998 tube and other cable mods my HD800 has some surprising bass slam on my WA2.  Give Glenn's amp all kudos it deserves (i.e alot)  just don't support the general concept that the HD800 is week on bass; because the is absolutely incorrect!!!

Hoping to find the best combo to get more out of mine.

 

[2359glenn]

  I ask because there is a glenn amp in the classifieds and I'd like to know what the difference is in term of the otl sound?  I also have a csp2+ so I can also reference that. 

The one in the classifieds is the one dubstepgirl listened to.
It is the basic amp no 6>12>25 switch and no 5998 switch can still use 5998s though
It will sound the same as whirlwind's amp though. And it has the normal 5U4 type rectifier but also can take the 3DG4 rectifier

 

[jc9394]

 
The one in the classifieds is the one dubstepgirl listened to.
It is the basic amp no 6>12>25 switch and no 5998 switch can still use 5998s though
It will sound the same as whirlwind's amp though. And it has the normal 5U4 type rectifier but also can take the 3DG4 rectifier

 
Yep, it is kind of sad to list it but I just don't have time to listen to it plus I'm toying the idea of getting a 300B from Glenn in the future.

 

[punit]

 
The one in the classifieds is the one dubstepgirl listened to.
It is the basic amp no 6>12>25 switch and no 5998 switch can still use 5998s though
It will sound the same as whirlwind's amp though. And it has the normal 5U4 type rectifier but also can take the 3DG4 rectifier

So no diff in sound by using the Lundahl tranformer & rectifiers different than 5U4 / 3DG4 ?

 

[Sfox7076]

Do you make the 300B amp with switchable driver tubes?  If so, which ones?  Has anyone used a 2C50 in any amp yet?

 

[2359glenn]

 

 
The one in the classifieds is the one dubstepgirl listened to.
It is the basic amp no 6>12>25 switch and no 5998 switch can still use 5998s though
It will sound the same as whirlwind's amp though. And it has the normal 5U4 type rectifier but also can take the 3DG4 rectifier

So no diff in sound by using the Lundahl tranformer & rectifiers different than 5U4 / 3DG4 ?

It probably sounds a little different but I didn't have one of the old ones to A-B test.
Listening to it by itself it sounded the same with lower noise due to the Lundahl transformer.

 

[2359glenn]

  Do you make the 300B amp with switchable driver tubes?  If so, which ones?  Has anyone used a 2C50 in any amp yet?

No not at this time it only uses the C3g for a driver.

 

[jhljhl]

 
Yes I can use the same transformer as gibosi's.
Actually $300 cheaper than whirlwind's amp.

I am really interested in this configuration.  How does the c3g sounds with the 5998s?

 

[lukeap69]

Is lower noise floor the only benefit of using Lundahl xformer on the OTL amp? Will it even noticeable when using HD800 (never had any issue with noise floor on any amp I have tried with this.)

 

[2359glenn]

Is lower noise floor the only benefit of using Lundahl xformer on the OTL amp? Will it even noticeable when using HD800 (never had any issue with noise floor on any amp I have tried with this.)

Yes
The Lundahl transformer has little 50/60 Hz magnetic field. This magnetic field can be picked up by the wiring.
Otherwise it sounds the same makes the same voltage. Except the old transformer has a 5 volt winding for a 5U4 , 5AR4 rectifier