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Woo Audio Amp Owner Unite - Page 2162

post #32416 of 32418
Quote:
Originally Posted by kokushu View Post
 

...  Did you get the sylvania tall glass version Tony?  I think those are the older one and supposedly better than the short one.

 

The 7N7s supplied by Woo were Tung-Sols. I can't see any date markings on them.

 

I will plug these in again with the Brimar and give them another run. Perhaps I didn't give them enough hours on the first try - it is hard to keep them in as they suck pretty hard.

 

EDIT - now this is odd - the 7N7s are performing very well with the Brimar. Some slight harshness and microphonics that I hope will disappear with more hours, but they are showing great promise. Not sure why I detested them on the first try - perhaps this was back when I had sucky rectifiers.

 

Anyway, these are not bad tubes at all. Tempted to try them in the WA5, but I don't have a 7N7->6SN7 adapter.

 

If the slight harshness and microphonics fade with more hours these could be winners. I have had them sitting on a shelf, unloved, for quite a few months - in fact I think I came close to binning them after the first listen. Glad I didn't.


Edited by TonyNewman - Today at 11:55 am
post #32417 of 32418
Quote:
Originally Posted by Badas View Post

^

Interesting. I think this going to be a real mystery. Seems that when you order from Langrex it is a lottery with what you get. I ordered brown base on two orders and both times that is what was supplied, but the black plate business is something new.

My first order i was expecting 5Z4GR brown base like on picture i got black base 5Z4G on there site .The second time i ordered i asked for 5Z4GR brown base and thats what i,got .

post #32418 of 32418
Quote:
Originally Posted by Badas View Post

^

Interesting. I think this going to be a real mystery. Seems that when you order from Langrex it is a lottery with what you get. I ordered brown base on two orders and both times that is what was supplied, but the black plate business is something new.

 

Generally speaking, black-plate tubes are older than grey-plate tubes.

 

Black base versus brown micanol base should make no difference whatsoever, unless yours is an aerospace application.

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