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Has anyone compared different 6F8G's yet?

post #1 of 47
12/11/08 at 3:12pm
Thread Starter 
Just wondering what the characteristics of different brands are.
I've only had a few minutes with my new rca tube (and adapter) but my first impression is very favorable.
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post #2 of 47
12/11/08 at 3:24pm
In general I like the 6F8G a lot as a tube, and all of the ones I have sound good. But the Tung-Sol does sound best to me. The RCA and Sylvania were next, and very similar, followed by the National Union. But ALL were good.
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post #3 of 47
12/18/08 at 2:43pm
I especially like the Ken Rad; maybe better than the TS. I have tried everything but the NU and I really like all of them.
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post #4 of 47
12/18/08 at 2:52pm
I haven't been able to score any Ken-Rads yet
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post #5 of 47
12/18/08 at 3:17pm
RCA, Sylvania, Hytron, IEC and Raytheon. So far IEC is my favorite.
IEC has flat plates like in RCA/GE 6sn7s.

And also no luck for finding KenRad, NU, TS .....
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post #6 of 47
12/18/08 at 3:55pm
IEC was only a rebrander - I wonder who made the ones you have...
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post #7 of 47
12/22/08 at 4:17pm
Quote:
Originally Posted by Skylab View Post
IEC was only a rebrander - I wonder who made the ones you have...
reply from tubestore:

Out of the couple dozen 6F8G tubes we have in stock, all are the same construction regardless of brand. I think they are all RCA produced and they are all what I would call flat-plate, much like common RCA 6SN7 tubes.
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post #8 of 47
12/22/08 at 4:46pm
There is no doubt my Tung-Sols are Tung-Sol made, and they are round-plate, not flat. My RCA and Sylvania's are flat-plate, but I bet the Sylvanias are Sylvania-made.
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post #9 of 47
12/22/08 at 5:04pm
IEC is clear glass flat plat.
The Sylvania I have is flat plate with grey glass.
Can't see the inside of RCA as it is all grey.
Reytheon has t-plate.
Hytron has round plate.
Waiting for TS now...
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post #10 of 47
12/30/08 at 10:01pm
Thread Starter 
I ordered a sylvania, ken-rad, and tungsol this week. After I get them and have a chance to compare I'll post my impressions. As an aside, I expected that it would be easier to find these tubes. I sent probably a dozen emails to various sellers before I found the tubes I wanted. Now they just need to show up and work. I can forward the places I bought these tubes from if anyone is interested.
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post #11 of 47
12/31/08 at 10:46am
Love to know where you got the Tung-Sols. The only place I found was Buenos Aires Radio, and he's good to deal with, but it is Argentina - love to find a place in the USA...
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post #12 of 47
1/6/09 at 8:04pm
Thread Starter 
I've had a few days with a sylvania and a few minutes with a ken-rad and I think they are both better than the rca. The sylvania has better clarity and 'punch.' Very enjoyable. The ken-rad (after literally just a few minutes) is similar to the sylvania but with more powerful bass. I'll update later tonight after more time with the ken-rad and first impressions of the tung-sol. Loving the 6f8g. Really brings out more excitement than I'd had with 6sn7.
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post #13 of 47
1/6/09 at 8:49pm
I like the Sylvania too. I have one in a PPX3 SLAM with TS 5687s right now .... a very transparent combo with a nice openess and fast transients. The RCA works best with a brighter output tube like the Amperex 7119, IMO.
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post #14 of 47
1/6/09 at 9:22pm
Thread Starter 
I've seen a couple of ebay auctions for 'radiocoin' 6f8g's that have gone for $40+. Anyone know anything about those tubes? Why are they so much more expensive than other brands?
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post #15 of 47
1/7/09 at 12:29am
Those Radiocoin's sure LOOK like they are Tung Sol black-glass round-plates...
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