OTLs, tube rolling, and other glowing delights

And on the topic of headphones, I have been modding my HD700 per Takato:

http://superbestaudiofriends.org/in...er-hd700-is-now-listenable-the-hd750-mod.142/

Did the filter-paper mod a week or so ago and was so impressed with the improvement that I decided to proceed with the ear-pad mod. Last night and this afternoon, cut and sewed up a spare pair of ear-pads and just put them on. I really like what I am hearing.

 

Was thinking the same thing with HD800 might try the anax mod easy enough to do and reversible just to see how it sound i have the template to cut the parts i only need materials ,possibly my next project . Still waiting on those globe rectifiers this other tube guy is on vacation hopefully will get them next week .Could of had one this weekend but it was a dud .

 

any resident tube gurus have any experience with the 6C41C? looks like an interesting tube. a 'baby' single triode version of the 6C33C found in the Zana Deux.

 

When it comes to modding headphones, I do not have adequate knowledge or experience to evaluate and debate the relative merits of different products and techniques. In this regard, I accept my limitations and am perfectly content to be a follower and a copycat.

To my amazement, these relatively simple mods have transformed the HD700 into a significantly better headphone. It is not at all subtle. It is a major upgrade. My system has never sounded better. Of course, if and when someone else comes out with another set of mods, I will more than happy to try them as long as they are relatively inexpensive, reversible and not too difficult to implement. But for now all I want to do is relax and listen to my music.

 

For any queries ask Gurubhai, it's his creation that i managed to rob.
This amp loves the u52 and u54. Both expensive and rare, i had the priviledge to hear them both and wish to own someday.

 

So you admit to it now, certainly was a robbery !
Been really missing this amp lately. The little 6dj8 OTL I have been using in the interim is a very good amp, excellent even but it doesn't quite have the same magic and finesse of this amp.
Wish I had more time to complete the next one sooner.

This one is another of my 6AS7 OTLs with somewhat exotic part selection and a much higher 6AS7 current bias. It uses a choke filtered, tube rectified power supply, which is centered around GZ32 but ofcourse most other 5V rectifiers can be used as well.The black base U52 is certainly a favorite in this amp.
The input tube is a 6SN7 for which my favorites are the Tungsol bgrp and RCA Vt-231 and for output tube I prefer the GEC 6080.
No electrolytic caps in this one, polypropylene throughout which explains the huge chassis for an otherwise simple amplifier.

 

Nice looking thread here with some great tubes.
I don't have gear that qualifies so I'll just lurk and enjoy.

 

A very good question! Among American manufacturers, this just might be the case, but I really don't know. However, given that the C3g, C3m and similar tubes have loctal bases, one can add Siemens, Lorenz, Telefunken and perhaps others to the list.

 

The amp doesn't matter. Any tube that lights up pretty at night automatically qualifies.

 

Ahoy mate arrrrrg !!!!!! welcome .

 

Reminds me of a song ¨Just an illusion¨

 

Looking to get a 83V rectifier any brand in particular is better .Thanks.

 

1952 - according to an explanation I read recently.

I really enjoy deciphering the dots. Admittedly I also need to get out more.

 

Shaffer ever try ECC31, 6N7 ,types in your WA6 i taught it would work but it doesnt i insert NR73/1285 tube in ECC31 TO 6SN7 adapter together with 6sn7 to 6DE7adapter and there's nothing maybe adapters are not wired right to use in this configuration i dont know any ideas ?

 

That's nice i also have a couple radios lots of tubes in them surprised the body doesnt melt this 1939 ,39 3A-5 bakelite PHILCO i have which doesnt work is packed with tubes also have a 1946 RCA M-46 that works .always nice to look at .

 

Thanks for the link was waiting for it ,always nice to get free tunes .

 

Ordered some ECC31 to 6DE7 adapters for WA6 from Suzier inc. $9.00 each decent quality and so far 5Z3 TO 5U4G adapter works great .Let's hope they will be here in 2 weeks like last time

 

I asked seller before buying if those would work with ecc31 tubes he said yes but i realized that i have a pair of 6sn7 to 6de7 adapters from Woo tried ecc31 with them and it doesnt work so i contacted him again to make shure what he said was ok now he's not shure ,oh boy !

 

So i finally canceled my order for the adapters dont think they would of worked plan ¨B¨ ive contacted WOO AUDIO to see if they make those adapters for the WA6 who knows maybe we cant use them in the WA6 should know soon .

 

Woo adapters are really nice made with teflon but for me 3-4 times the price of chinease brass adapters Do you like the 7N7 worth trying ,did you ever compare them to 6SN7 in your WA6 , those adapters are probably available on Ebay will check it out .