[hifimanrookie]

Quote:

No I meant really cheap, the 100 bux could be enough or even less for true rms dmm.
you'll need to measure the voltage on the cathode resistor(white box) to ground read and write the value down, then measure the voltage drop on the plate resistor(across resistor) not to ground, divide this voltage by the value of the plate resistor.This gives you the amount of current being drawn by input tube in milliamps. Write this value down.
Knowing the voltage value on the cathoade which could be closest value of your AA rechargeable cell.
Remove the "white box"place the battery between the cathode and ground so we have now constant pure DC source, battery cathode bias.
Batery that can by use, NiMh, NiCad or NiZn, do not use alkaline battery can explode! The cathode circuit itself keeps the battery charged so you don't have to be wary, they will last as long as the battery will. I pull out my battery after 3 months of use and check with the DMM and the voltage is keeps steady.

Wish u would live closer to me..u for sure could help in modifying my 337 for sure!

 

[xmdkq]

The 337 space is not enough, the structure is not satisfactory, more difficult to modify.
 

 

[telecaster]

Thanks Wall-E again!
 
I will try that battery bias for sure now! Seems doable enough! How would you describe the bass response to the fix battery bias? I am always looking for more bass extension and weight.

 

[Ultrainferno]

Quote:

The 337 space is not enough, the structure is not satisfactory, more difficult to modify.
 

 
Hifiman keeps forgetting this is the awesome 339 thread

 

[snip3r77]

you can get tubes pretty cheap that are still quality and sound good at least to those that own the 339 http://www.headfonia.com/lafigaro-339-my-fav-otl-amp/ check this out the first set of tubes he uses can be found for under 50 dollars for all 4 tubes. 

Do you mean the RCA 6AS7G power tubes with a Telefunken EF80 ? What is the adaptor that is required for the EF80?

 

[WALL-E]

Quote:

Wish u would live closer to me..u for sure could help in modifying my 337 for sure!

Wish i could, like xmdcq said the 337 is different structure than 339

, but i think some of the mods can be apply too. We can talk about it on London Meet, u coming right?

 

[hifimanrookie]

Quote:

Wish i could, like xmdcq said the 337 is different structure than 339

, but i think some of the mods can be apply too. We can talk about it on London Meet, u coming right?

Yep am comin for sure..we will have a chat then

and ultrainferno..yep i know its 339 thread..but am just curious..hope U dont mind.

 

[Ultrainferno]

Quote:

Do you mean the RCA 6AS7G power tubes with a Telefunken EF80 ? What is the adaptor that is required for the EF80?

 
It's the 6SJ7 to EF80 adapter, Yuking sells them too.
 

 

[Ultrainferno]

Quote:

and ultrainferno..yep i know its 339 thread..but am just curious..hope U dont mind.

 
I'm just playing. Teasing you as a 337 owner

 

[hifimanrookie]

Quote:

 
I'm just playing. Teasing you as a 337 owner

I know mr inferno..am teasing u back..

 

[Contrails]

Don't shoot the messenger but I'll bet you 1 cold beer those aren't mesh plates 6SJ7GT

 
Utrainferno, you owe me one very cold beer!
 
 
 
 
 
   
 
 
 
Hehehe, just kidding mate.  I picked three of them for $50 from another website.  In regards to the initial purchase, I had the ribbed plate tung sols swapped for red 5693s. I am still waiting on them.  
 
The LF339 has been up and running for a week.  I am impressed even with the stock tubes.  I haven't listened to the Tung sols yet.  I would rather wait till the RCA 6AS7G.  My flatmate saw the amp and very intrigued by it. I told him it was a very expensive mosquito repellent.  I actually managed to convince him till I couldn't hold myself back.  

 

[Ultrainferno]

You should have taken pictures of his face! Enjoy the tubes!
 

 

[hifimanrookie]

Quote:

 
Utrainferno, you owe me one very cold beer!
 
 
 
 
 
   
 
 
 
Hehehe, just kidding mate.  I picked three of them for $50 from another website.  In regards to the initial purchase, I had the ribbed plate tung sols swapped for red 5693s. I am still waiting on them.  
 
The LF339 has been up and running for a week.  I am impressed even with the stock tubes.  I haven't listened to the Tung sols yet.  I would rather wait till the RCA 6AS7G.  My flatmate saw the amp and very intrigued by it. I told him it was a very expensive mosquito repellent.  I actually managed to convince him till I couldn't hold myself back.  

I actually saw a musquito go bezerk after flying against my red hot 5998 at night..dont know if its dead..but man..as if it was hit by lightling..lolz

 

[Golotripa]

Haha that would have been funny, I'm going to start throwing insects at mine

 

[snip3r77]

Between the drivers and the power, which is more significant?