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2359glenn | studio - Page 677

post #10141 of 10349

rndell your amp looks so good, pleased you like it.

Have you got the 5998 mod?

post #10142 of 10349
Quote:
Originally Posted by rosgr63 View Post
 

rndell your amp looks so good, pleased you like it.

Have you got the 5998 mod?

What is 5998 Mod, Precious?

post #10143 of 10349

The 5998 mod is a switch on the back that switches from 6AS7 to 5998 or 6336.

It puts the proper bias for a 5998 making it sound better then it would biased as a 6AS7.

It still sounds good run as a 6AS7but why not bias it right improving the sound further.

post #10144 of 10349
Quote:
Originally Posted by 2359glenn View Post
 

The 5998 mod is a switch on the back that switches from 6AS7 to 5998 or 6336.

It puts the proper bias for a 5998 making it sound better then it would biased as a 6AS7.

It still sounds good run as a 6AS7but why not bias it right improving the sound further.

Handy thing!

post #10145 of 10349
Also the 5998 switch allows the use of low impedance phones if you use 6336 output tubes.

For me this is a major + point regarding Glen's OTL as normally you can use only high impd cans with OTL's.
post #10146 of 10349

It does make the 5998's sound better than if run as 6AS7G's.

Not many OTL's are biased correctly for the 5998's so to me it's a nice mod to have.

post #10147 of 10349
Quote:
Originally Posted by 2359glenn View Post
 

The 5998 mod is a switch on the back that switches from 6AS7 to 5998 or 6336.

It puts the proper bias for a 5998 making it sound better then it would biased as a 6AS7.

It still sounds good run as a 6AS7but why not bias it right improving the sound further.

 

Is the 5998/6336 switch now standard on your OTL's?

post #10148 of 10349
Quote:
Originally Posted by gibosi View Post
 
Quote:
Originally Posted by 2359glenn View Post
 

The 5998 mod is a switch on the back that switches from 6AS7 to 5998 or 6336.

It puts the proper bias for a 5998 making it sound better then it would biased as a 6AS7.

It still sounds good run as a 6AS7but why not bias it right improving the sound further.

 

Is the 5998/6336 switch now standard on your OTL's?


It is a extra I leave out these parts out to keep the price down.

It sounds pretty darn good stock.

post #10149 of 10349
Quote:
Originally Posted by 2359glenn View Post
 


It is a extra I leave out these parts out to keep the price down.

It sounds pretty darn good stock.

Sign me up for that extra, Glenn! 

post #10150 of 10349
Quote:
Originally Posted by jc9394 View Post

The OTL is worth every pennies, just spend another $250ish for better tubes and you will have a kick ass amp.

I am thinking seriously about doing just this.....pairing with ps audio nuwave dac & HD800

 

Quote:
Originally Posted by punit View Post

Also the 5998 switch allows the use of low impedance phones if you use 6336 output tubes.

For me this is a major + point regarding Glen's OTL as normally you can use only high impd cans with OTL's.

This means Grados could actually work quite well with this switch........this is looking better and better

post #10151 of 10349
Quote:
Originally Posted by whirlwind View Post
 

I am thinking seriously about doing just this.....pairing with ps audio nuwave dac & HD800

 

This means Grados could actually work quite well with this switch........this is looking better and better

 

Glenn has mentioned that only high current rectifiers should be used ( 3DG4, GZ37 & WE422A ) in such case i.e. for driving low impedance phones by using the 5998 switch with 6336 output tubes

post #10152 of 10349
Quote:
Originally Posted by punit View Post
 
Quote:
Originally Posted by whirlwind View Post
 

I am thinking seriously about doing just this.....pairing with ps audio nuwave dac & HD800

 

This means Grados could actually work quite well with this switch........this is looking better and better

 

Glenn has mentioned that only high current rectifiers should be used ( 3DG4, GZ37 & WE422A ) in such case i.e. for driving low impedance phones by using the 5998 switch with 6336 output tubes


You can also use 5AU4 & 5AW4 others will work but it will be pushing them to the max.

post #10153 of 10349
Quote:
Originally Posted by whirlwind View Post

I am thinking seriously about doing just this.....pairing with ps audio nuwave dac & HD800

Almost like my setup, I'm really happy with Perfect Wave MKII > Glenn OTL > HD800.
post #10154 of 10349
Quote:
Originally Posted by jc9394 View Post
 
Quote:
Originally Posted by whirlwind View Post

I am thinking seriously about doing just this.....pairing with ps audio nuwave dac & HD800

Almost like my setup, I'm really happy with Perfect Wave MKII > Glenn OTL > HD800.

 

 

Ahhhh.....very nice.....I am so glad to hear this

post #10155 of 10349

Has anyone tried a 5687 as a driver in their OTL? This tube is most notably used in the Audio Note Ongaku along with the 211 and 6072. To my eyes at least, with an adapter, it looks like this tube should work....

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