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Dark Voice 339 - Page 109

post #1621 of 2581
Quote:
Originally Posted by WALL-E View Post

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!biggrin.gif

post #1622 of 2581

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

post #1623 of 2581

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.

post #1624 of 2581
Quote:
Originally Posted by xmdkq View Post

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

 

Hifiman keeps forgetting this is the awesome 339 thread :D wink.gif

post #1625 of 2581
Quote:
Originally Posted by wazzupi View Post

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?
post #1626 of 2581
Quote:
Originally Posted by hifimanrookie View Post

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

Wish i could, like xmdcq said the 337 is different structure than 339frown.gif, but i think some of the mods can be apply too. We can talk about it on London Meet, u coming right?

post #1627 of 2581
Quote:
Originally Posted by WALL-E View Post

Wish i could, like xmdcq said the 337 is different structure than 339frown.gif, 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 thenbeerchug.gif

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


Edited by hifimanrookie - 3/20/13 at 1:36am
post #1628 of 2581
Quote:
Originally Posted by snip3r77 View Post


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.

 

post #1629 of 2581
Quote:
Originally Posted by hifimanrookie View Post

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

 

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

post #1630 of 2581
Quote:
Originally Posted by Ultrainferno View Post

 

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

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

post #1631 of 2581
Quote:
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!

 

 

 

 

 

20130320_180348.png 1,657k .png file

 

 

 

 

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.  


Edited by Contrails - 3/20/13 at 3:48am
post #1632 of 2581

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

post #1633 of 2581
Quote:
Originally Posted by Contrails View Post

 

Utrainferno, you owe me one very cold beer!

 

 

 

 

 

20130320_180348.png 1,657k .png file

 

 

 

 

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

post #1634 of 2581

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

post #1635 of 2581
Between the drivers and the power, which is more significant?
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