Dark Voice 339 - Page 93

Hey Wall-E,

I'm finer than ever, but life's can get can so busy you know what I mean.. Lack of time to be around but still a great crowd and a great amp!

 

Still enjoying this very fine heavy amp with its mod its going strong! Now with what is inside, only a nuclear bomb can make it stop working and even then I also doubt it would stop it!

 

Thanks for you adapter, I kind of missed the TS sweet sound and as they were sleeping quietly they looked kind of sad!

 

Thanks for the list, I ordered the item but I went a little adventurous and took black cmc octal socket, I could still shave them if they don't fit like yours. Your teflon's looks like a perfect fit though.

 

PS: I call this mod the yellow blue 339 mod

 

 

 

 

.The french 339 mod was with SCR film caps but with french glass wound rez.

 

Cheers and rock on!

 

c

Edited by telecaster - 2/14/13 at 4:45pm

double post

Edited by telecaster - 2/14/13 at 9:54pm

Mr. Caster, that looks wonderful. What size caps did you use? Heck, I'd appreciate any details on this mod you'd wish to share.

 

KP
 

I can only talk bout my 337 and i really love the combo tung sols 5998 (power) with tung sols sj7gt mesh plates (drivers)..alternative could be..bendix 6080 wb with graphite plates (power) with rca 5693 reds (drivers)..

ultrainferno would advice chatham tubes also..right ultrainferno?

The LF339 stock version modded by Boss itself and it is not a just parts upgrade this is much more.

 

http://www.diybuy.net/thread-416700-1-1.html

 

Good to hear that your amp back to life after small surgery. Actually I'm not surprised, the weakest point of this amp are wire wound resistors and using the Vashay instead of stock resistors can only get better.            

Having one working adapter use the DM checking one by one to localize the glitch.

 

Well said! have the same feelings as you.

Burn-In/Break-In also capacitors forming especially for el was the most important element affecting on how it's sound from first minute to current state.

 

PS adapter "schematic" updated to the post #1380.

I actually did figure out the issue with the adapter, but haven't figured out the best way to fix it yet.  I used a DMM to compare pin continuity and it looks like two pins were reversed.  It shouldn't be hard to just solder pins from the base to a new top, the problem is I'm not sure what those solder bridges they put on the adapters are for.  My best guess is they ground the circuit in some way.

 

Fixing the adapter is on my list of things to do, but I think I'm going to do; but I'm going to probably going to just order a $20 pair of tubes from tube center while I figure out how to fix it.  Maybe Yuking has a schematic of the adapters he could send.

For upgrading the capacitors,here its all detailed http://www.head-fi.org/t/611348/help-needed-to-upgrade-the-capacitor-in-otl-tube-amp
Edited by telecaster - 2/18/13 at 10:06am

Thank you wall-E I'll be vigilante about the filament Supply. You made a pretty clever adapter and I can't wait to try it out at on my amp, I concur Modding the output coupling caps is the most impactfull of all mods, but you can tune the sound further with different voltage biasing too.

I'm waiting for a new USB DAC from meridian and it looks pretty promising With the amp. I'll report on that later.

Thank you, green sir.

 

KP

Anyone uses the 337 here that can comment if there's a SIGNIFICANT difference with the 339?

Cheers.

 

No, we don't like 337 owners.

Just kidding

Maybe

 

There is a difference of 2, which is .06% and within the margin of error.

 

KP

 

PS. It seems the main difference is the size of the output caps on the 339.

Edited by TheKillerPiglet - 2/18/13 at 6:42am

I read this review and what was mentioned are as follows.

Here’s what LF had to say: “The output capacitors of 337 series machines is only 50μF but 339 is 130μF, so 339 have more strength in the bass, the structure of 339 is more reasonable, the pipe is on the front far from the the transformer avoiding interference. Especially with low impedance, the headphones can be very clear, 337 has a mild hum when it running low impedance headphones. 339 has better components, tubes: RCA socket by CMC and Headphone socket by Neutrik both make reliability better”.

http://www.headfonia.com/lafigaro-339-my-fav-otl-amp/

Grrrrrrrrrrrr 

For those interested, I'm selling 2399 Chatham/tung Sol tubes (5998 equivalent). I did a group buy in the Woo Thread and there till are 14 10 8 6 5 tubes left. PM me for more info
 

Edited by Ultrainferno - 2/20/13 at 12:12am