Night Time Shots Of Our Tubes Glowing -- Post Them Here!!
Oct 5, 2010 at 2:07 PM Post #526 of 1,364

corigan

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Quote:
How is the 6F8G a replacement for the 6DE7?
 
I understand that they are both dual triodes. after that nothing about them is similar. at all. Ooh, the heaters in both tubes work on 6.3v they have 2 similarities.

 
Behaviorally they're identical to the 6SN7 -- looking at the specs between a 6EW7 and a 6SN7 the only real differences (outside of the socket) were gain.  IIRC the 6EW7/6DE7 have a Mu of around ~17.4 (someone correct my values if I'm wrong), whereas the 6SN7 has a Mu of 20.  Since the 6F8G is much cheaper than the 6SN7, I went with having those adapters made.  There's a lot of talk about this in the Woo Audio Owner Thread if you're interested.
 
 
Oct 5, 2010 at 2:10 PM Post #527 of 1,364

corigan

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Quote:
^ I'll check my supply when I get home. I have 2 quads of 1944 Raytheons, and a whole bunch of singles. Well, a bunch--like maybe 4 or 6 I forget. I think the only Army-grade tubes I have are the Raytheons. But I'll report back to you this evening to tell you if I have a match for your Army-grade Tung-Sol or not.
smile.gif



I greatly appreciate it.  I have several sources to buy 6F8G, but since they're not very popular tubes I get nothing from the vendors in way of description prior to purchase. 
 
Oct 5, 2010 at 2:14 PM Post #528 of 1,364

nikongod

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The specs for one of the sections are very similar.
 
The specs for the other section are anything but similar. Plate impedance, mu, power rating are alllll different.
 
http://www.nj7p.org/Tube4.php?tube=6ew7
 
This is a case of replacing a $3 tube thats ideal for the job (its like the amp was designed around it!) with a $20 one that is pretty much not right at all because the datasheets were misread. 
 
Oct 5, 2010 at 2:21 PM Post #529 of 1,364

Skylab

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I confess I have never understood how replacing a dissimilar triode like the 6DE7 with a 6SN7 would work, but I have been assured that in the WA6 that it will.  The only reason to do it is if one has a lot of nice 6SN7's already.
 
Anyway, that is very off topic here, let's take it to the WooAudio thread...
 
Oct 7, 2010 at 10:43 PM Post #530 of 1,364

Golden Monkey

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Just some Woo 3 porn, featuring a Tung Sol 5998, 1959 Amperex US 6922s (PQ) (notice the sexy D getters?), and some Amperex (Heerlen) Valvo labelled 7DJ8s, and (most) of the rest of my tubes, as the chorus...





 
 

 
Oct 8, 2010 at 11:29 AM Post #531 of 1,364

Skylab

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GREAT shots!
 
Oct 8, 2010 at 7:36 PM Post #533 of 1,364

Golden Monkey

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Oct 9, 2010 at 3:46 PM Post #536 of 1,364

Towert7

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Quote:
Thanks guys!  They made me realize my 5998 was a bit dusty, lol...



Yes, great photos.  Really a nice 'warm' color to them.  ^_^
I like it.
 
Oct 9, 2010 at 3:48 PM Post #537 of 1,364

Towert7

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Quote:
Originally Posted by Ferrari /img/forum/go_quote.gif
 
and a GU-32 (832A)
 
 


Oh my.  I dare say they don't make those tubes any more...., do they?
 
Also, did you build that amp yourself?
 
Oct 9, 2010 at 4:14 PM Post #538 of 1,364

Ferrari

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Quote:
Oh my.  I dare say they don't make those tubes any more...., do they?
 
Also, did you build that amp yourself?


 
[size=x-small]Indeed, this tube is no longer made nowadays. What I use on my amp is old craps from the ’70 and ’80.[/size]
[size=x-small]You are right that I build that amp myself, not finished yet due to crazy work schedule lately.[/size]

 
 
Oct 9, 2010 at 7:10 PM Post #539 of 1,364

Towert7

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Quote:
 
[size=x-small]Indeed, this tube is no longer made nowadays. What I use on my amp is old craps from the ’70 and ’80.[/size]
[size=x-small]You are right that I build that amp myself, not finished yet due to crazy work schedule lately.[/size]

 



I'm impressed.  It looks very good.
 
Oct 11, 2010 at 9:15 AM Post #540 of 1,364

Skylab

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I took a new shot of my Decware Mini-Torii, which is a tube-glow champ
biggrin.gif

 

 

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