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PostPosted: Mon Jan 15, 2018 7:47 pm 
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Mark III

Joined: Sun Aug 21, 2016 5:23 pm
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Location: Hardwood Heaven
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5x Jan-Philips/Sylvania 6CA7 - Mesa STR-416 EL34 up top.
12x Jan-Philips Sylvania 6L6GC - Mesa STR-415 6L6 on the bottom.

I'm slowly grabbing these up as I find them, mostly in old amps that are priced well.

Does anyone out there know if there were two versions of the STR-415? I have all these that look the same, then recently saw some where the plates are closer to black and the little guide pieces that hold the pins/plates are closer to white. They're clearly labeled STR-415, but look a little different? Just curious if anyone knows.

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PostPosted: Tue Jan 16, 2018 4:30 am 
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Mark III

Joined: Tue Sep 20, 2011 11:15 am
Posts: 190
They look great.
Surley you don't need all of them?
Could you not spare a a pair of 6L6's for a fellow Boogie Boarder :)
I've seen a Mesa labeled STR 415 that didn't have the dual getter,only a single halo getter.


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PostPosted: Tue Jan 16, 2018 9:16 am 
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Mark IV
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Now look at that. The best powertubes ever.
I remember when I first got to this forum, and read about the Sylvanias my curiosity took over and I had to give them a go. Which ended in the conclusion: Sylvania's vs everything else. The difference IS that big.
I've seen both single and dual getters for the STR415, so they differ somewhat, but I haven't heard any sound difference in them.
I somewhat hoard myself and have Sylvanias in all my amps, even the dual rec, and buy the STR387 labelled Sylvania, Philips, RCA or whatever I can get. The 6CA7 or STR416 is a lot more rare though. I bought a bias probe just to match the tubes myself.

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PostPosted: Tue Jan 16, 2018 3:22 pm 
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Mark III

Joined: Sun Aug 21, 2016 5:23 pm
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Location: Hardwood Heaven
Thanks for the comments, guys. I didn't get a chance to look at the getters on those other 415s, but based on this I am assuming they will be the single halo type.

Looking back I had another 10 STR-415s pass through my hands over the last few years before I realized how uncommon they are. Live and learn! The GT labeled ones on the right were a complete bonus. I bought an amp I really wanted and was so excited that I never looked at all the spare tubes that came with it. Only months later I pulled them out and noticed they were Sylvanias. Score!

Finding STR-416s has been a lot more of a challenge. Both these sets came in old Mark IIIs that I don't think got played very much for 30 years. A local friend had the 5th one and had no need for a single. Now I've got a spare!

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PostPosted: Thu Jan 18, 2018 12:59 pm 
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Mark II

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Getting ready to re-tube the ole Coliseum? lol

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PostPosted: Fri Jan 19, 2018 1:18 am 
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Dual Recto

Joined: Tue Feb 07, 2006 11:21 pm
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I have all Sylvania power tubes in my C+ Boogies. The ONLY way to go in my opinion. I have a box in the top of my closet that I have expressed to my family to NOT sell in a yard sale after my death. The 416's were much harder to come by, for sure. I bought one pair on Ebay that were listed as MESA EL-34's, for about $50.00 8)

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PostPosted: Mon Feb 05, 2018 11:03 am 
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Mark IV

Joined: Fri Jul 01, 2011 4:09 pm
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JOEY B. wrote:
I have all Sylvania power tubes in my C+ Boogies. The ONLY way to go in my opinion.

+1 +2 +3 +4 etc etc!!

Especially the 416's (6CA7's/ EL34's) in a Simul.
The first time I put a pair in and played through it in Class-A mode I was blown away.
It had the rich chime of EL-34's with the deeper/ fuller sound of 6L6's.
NO other 6CA7/ EL34 has this capacity. They are worth every dime!


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PostPosted: Mon Feb 05, 2018 11:52 am 
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Mark III

Joined: Sun Aug 21, 2016 5:23 pm
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Location: Hardwood Heaven
BoogieHog wrote:
Getting ready to re-tube the ole Coliseum? lol


I don't have one anymore! Traded it for more hardwood cabs. The hardwood hunger is real!

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