[wkahwkah]

Hello guys
I'm finally joining the club!!! Purchased Yates7592's OTL and it was sent to Glenn to get voltage changed to 110v. Amp finally arrived yesterday! Very impressed looking amp!
I still have alot to learn about tubes so will be asking lots of questions as it is my first true OTL tube amp.
Having tube rectifier does add bit of complication with tube choices when using with Lundahl transformer. it seems fine with 6x 6bx7 but with 6080, 6AS7, or 6336 amp draw is close or over 13 amps.

Currently rocking with Cossor 53ku fat bottle, Foton 6H8C (6SN7GT), and 6x RCA 6BX7GT

 

[mordy]

Hello guys
I'm finally joining the club!!! Purchased Yates7592's OTL and it was sent to Glenn to get voltage changed to 110v. Amp finally arrived yesterday! Very impressed looking amp!
I still have alot to learn about tubes so will be asking lots of questions as it is my first true OTL tube amp.
Having tube rectifier does add bit of complication with tube choices when using with Lundahl transformer. it seems fine with 6x 6bx7 but with 6080, 6AS7, or 6336 amp draw is close or over 13 amps.

Currently rocking with Cossor 53ku fat bottle, Foton 6H8C (6SN7GT), and 6x RCA 6BX7GT

Hi wk,
Welcome to the thread and congrats on your purchase! So the mystery is finally solved where the amp went!
As long as you stay with not more than 13A current draw of tubes you should have no problems with the Lundahl transformer.
The 6BX7 are 1.5A; the 6080/6AS7 are 2.5A, the 6336 5A, and the 6H8C/6SN7 are 0.6A.

 

[wkahwkah]

Hi wk,
Welcome to the thread and congrats on your purchase! So the mystery is finally solved where the amp went!
As long as you stay with not more than 13A current draw of tubes you should have no problems with the Lundahl transformer.
The 6BX7 are 1.5A; the 6080/6AS7 are 2.5A, the 6336 5A, and the 6H8C/6SN7 are 0.6A.

Hi Mordy, thanks very much.
My understanding is 13A current draw includes the rectifier. 5AW4 draws 3.7A, 5U4GB draws 3A, 53ku draws 2.8A, and gz32 draws 2A, etc but since they're 5V, not sure what the actual draw at 6.3V.
with 6x 6bx7= 9A, 4A should be enough for the driver+ rectifier but with 4x 6080/6AS7 or 2x 6336 puts at 10A so only leaves 3A for the driver and rectifier. Probably could use hexfred rectifier and
not worry about the tube rectifier.

 

[rnros]

Hi Mordy, thanks very much.
My understanding is 13A current draw includes the rectifier. 5AW4 draws 3.7A, 5U4GB draws 3A, 53ku draws 2.8A, and gz32 draws 2A, etc but since they're 5V, not sure what the actual draw at 6.3V.
with 6x 6bx7= 9A, 4A should be enough for the driver+ rectifier but with 4x 6080/6AS7 or 2x 6336 puts at 10A so only leaves 3A for the driver and rectifier. Probably could use hexfred rectifier and
not worry about the tube rectifier.

First, congrats on the GOTL, looks good to the eye, sounds even better to the ear.
I have nothing but good things to say about GOTL. Enjoy! : )

On the 13A max current draw, I had asked a similar question, here is Glenn's response:
https://www.head-fi.org/threads/2359glenn-studio.600110/page-1143#post-13912667

 

[2359glenn]

Hello guys
I'm finally joining the club!!! Purchased Yates7592's OTL and it was sent to Glenn to get voltage changed to 110v. Amp finally arrived yesterday! Very impressed looking amp!
I still have alot to learn about tubes so will be asking lots of questions as it is my first true OTL tube amp.
Having tube rectifier does add bit of complication with tube choices when using with Lundahl transformer. it seems fine with 6x 6bx7 but with 6080, 6AS7, or 6336 amp draw is close or over 13 amps.

Currently rocking with Cossor 53ku fat bottle, Foton 6H8C (6SN7GT), and 6x RCA 6BX7GT

The Amp will be fine if you use
six 6BL7/6BX7s
Four 6AS7 types
or two 6336

This amp has two $200 Duelund coupling capacitors Nice

 

[whirlwind]

Hello guys
I'm finally joining the club!!! Purchased Yates7592's OTL and it was sent to Glenn to get voltage changed to 110v. Amp finally arrived yesterday! Very impressed looking amp!
I still have alot to learn about tubes so will be asking lots of questions as it is my first true OTL tube amp.
Having tube rectifier does add bit of complication with tube choices when using with Lundahl transformer. it seems fine with 6x 6bx7 but with 6080, 6AS7, or 6336 amp draw is close or over 13 amps.

Currently rocking with Cossor 53ku fat bottle, Foton 6H8C (6SN7GT), and 6x RCA 6BX7GT

Congrats .

Enjoy your amp.

 

[wkahwkah]

First, congrats on the GOTL, looks good to the eye, sounds even better to the ear.
I have nothing but good things to say about GOTL. Enjoy! : )

On the 13A max current draw, I had asked a similar question, here is Glenn's response:
https://www.head-fi.org/threads/2359glenn-studio.600110/page-1143#post-13912667

I thought I read somewhere going little over 13A was okay, definitely putting in my note. This thread contains so much information!

The Amp will be fine if you use
six 6BL7/6BX7s
Four 6AS7 types
or two 6336

This amp has two $200 Duelund coupling capacitors Nice

Thanks Glenn, I was just little worried when paring 5AW4 with 2x6336b since it will be 13.7A + driver.

Congrats .

Enjoy your amp.

Thank you very much!

 

[2359glenn]

A little over is no big deal.
Figure four 6AS7 = 10 amps + rectifier = 13 and the 6SN7 .6 so 13.6 no big deal.
The high voltage secondary is 830 ma the electronics of the amp will not draw no were near that so it leaves a little more for the filaments.

 

[mordy]

Hi Mordy, thanks very much.
My understanding is 13A current draw includes the rectifier. 5AW4 draws 3.7A, 5U4GB draws 3A, 53ku draws 2.8A, and gz32 draws 2A, etc but since they're 5V, not sure what the actual draw at 6.3V.
with 6x 6bx7= 9A, 4A should be enough for the driver+ rectifier but with 4x 6080/6AS7 or 2x 6336 puts at 10A so only leaves 3A for the driver and rectifier. Probably could use hexfred rectifier and
not worry about the tube rectifier.

I am sure than the designer, 2359glenn, will be happy to answer all your questions. After all, he is the best one to ask about his amp.

 

[Monsterzero]

Has anyone else tried a Tung-Sol 6SU7GTY?
Coupled with the Mullard GZ32 and 6 6bx7s its an awesome combo. I actually prefer it to c3g,though they sound quite similar. The TS has slightly better soundstage. It also has zero grain on the bottom end with my Atticus,which I was picking up slightly with the c3g. Both hit like a truck and are very detailed.

Got mine here
I believe she has at least one left.

 

[2359glenn]

In the 50+ years of building amps I have never tried a 6SU7 going to have to try one.

 

[Monsterzero]

@2359glenn

My brother wants to have a GOTL built,but he knows much less about tubes than I and he feels my build is "overkill".
His main headphone is the ZMF Auteur(lucky S.O.B.) He also says he doesnt have a lot of time to roll tubes.

With all that said can you recommend a build for him? Im guessing he will want the Lundahl option for sure.

He isnt a member here but I will email him the link to your response. Also what is the current wait time?

 

[2359glenn]

@2359glenn

My brother wants to have a GOTL built,but he knows much less about tubes than I and he feels my build is "overkill".
His main headphone is the ZMF Auteur(lucky S.O.B.) He also says he doesnt have a lot of time to roll tubes.

With all that said can you recommend a build for him? Im guessing he will want the Lundahl option for sure.

He isnt a member here but I will email him the link to your response. Also what is the current wait time?

He needs the basic model just 3 or 4 tubes. 2 output tube sockets one 6SN7 and maybe a rectifier tube or maybe SS HEXFREDs
So 2 output tubes 6AS7 types and a 6SN7 type driver. This is all that's needed to have a good sounding amp.

 

[FunctionalDoc]

I own a pair Teak Auteur and going Lundahl option 3Cg option, and pla on using stock setup and 6BL7GTA or 4 or Glenn's affordable favorite's 6H13C.

I believe you don't have go crazy with expensive tubes to get great sound. I heard some great affordable tubes at whirlwind's setup.

 

[2359glenn]

I own a pair Teak Auteur and going Lundahl option 3Cg option, and pla on using stock setup and 6BL7GTA or 4 or Glenn's affordable favorite's 6H13C.

I believe you don't have go crazy with expensive tubes to get great sound. I heard some great affordable tubes at whirlwind's setup.

I don't believe that expensive tubes like GEC sound that much better to justify the price.
Cheep 6BX7s can sound better.