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PostPosted: Sun Feb 11, 2018 8:36 pm 
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Bottle Rocket

Joined: Sun Feb 11, 2018 8:22 pm
Posts: 7
Is there any suggestion of the substitutes of Mesa STR-415 & 416 tubes?
By google we know they are Sylvania 6L6 STR and EL34/6CA7. But the NOS tubes are really rare and expensive.
If there are other tubes can replace them and easy to be found.


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PostPosted: Mon Feb 12, 2018 11:55 am 
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Mark III

Joined: Sun Aug 21, 2016 5:23 pm
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Location: Hardwood Heaven
A lot of people have liked the SED Winged "C" tubes, especially the EL34s. At some point these were sold by Mesa as the STR-442 EL34 and STR-454 6L6. Now you can get them from various tube stores online. It looks like that factory is done making tubes though, so these are also going to get harder and harder to find as well. I am not sure either of these tubes have the same robustness or power handling of the Sylvanias, but people do really like the sound.

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PostPosted: Mon Feb 12, 2018 11:34 pm 
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Mark III

Joined: Sun Mar 06, 2016 10:38 am
Posts: 219
Location: Western Colorado
When I asked Mike B. for my 105 PT he recommended the TAD 6L6GC-STR as one that can take the voltage. If you read up on it it's loosely designed after the old 415.
http://www.thetubestore.com/Tubes/6L6-5881-Tube-Types/TAD-6L6GC-STR

He didn't think that an EL34 would have reliability problems in general, but reading it does look like the EH is a current copy of the 416. I might give them a try.
http://www.thetubestore.com/Tubes/EL34-6CA7-Tube-Types/Electro-Harmonix-6CA7EH


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PostPosted: Wed Feb 14, 2018 4:16 am 
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Mark II

Joined: Fri Jul 28, 2006 5:58 pm
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Location: Europe
GJgo wrote:
When I asked Mike B. for my 105 PT he recommended the TAD 6L6GC-STR as one that can take the voltage. If you read up on it it's loosely designed after the old 415.


I used those when I retubed my Mk III a few weeks ago. Too early to comment on the reliability but no problems so far.

Cheers Stephan


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PostPosted: Sat Feb 24, 2018 11:02 pm 
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Mark III

Joined: Sun Mar 06, 2016 10:38 am
Posts: 219
Location: Western Colorado
I talked to The Tube Store, the guy told me that the EH 6CA7 is a hot tube, not a good idea for my ~500PV 105 PTs. He recommended the JJ 6CA7 in the Class A slots since it's a naturally cold tube. So, I have some on the way- these in the A slots & the TAD 6L6GC in the A/B slots. We'll see how it goes. :)

I imagine on Boogies other than with the 105PT or Coliseums, the hotter tubes may be OK.


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PostPosted: Mon Feb 26, 2018 4:12 am 
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Bottle Rocket

Joined: Sun Feb 11, 2018 8:22 pm
Posts: 7
Thanks for all the suggestions.

How about the sound compare EH 6CA7 with JJ 6CA7?
I am also consider which tube should be used on my VHT 2502.


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PostPosted: Tue Feb 27, 2018 7:30 pm 
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Dual Recto

Joined: Tue Feb 07, 2006 11:21 pm
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Location: North Alabama C+ Mafia-Kingpin
Save your money, beat the bushes and wait for some good used Sylvanias to come up for sale. You will be glad at the peace of mind when it comes to using your amp with the tubes it was designed around. A good used Sylvania is just as reliable as ANY new production tube, if not a bunch more. Just sayin' . 8)

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PostPosted: Tue Feb 27, 2018 10:48 pm 
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Mark III

Joined: Sun Mar 06, 2016 10:38 am
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Location: Western Colorado
Nightswan- I didn't order the EH so I can't comment on those.

The Sylvanias do sound best, but they are $$$, hard to find, and good luck with how matched they actually are.

I wanted to prefer the 6L6 in the Class A slots because they are clearer, and have better highs & lows. However, the 6CA7s in those slots have a better midrange cut and more clarity when chording.


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PostPosted: Wed Feb 28, 2018 7:47 pm 
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Dual Recto

Joined: Tue Feb 07, 2006 11:21 pm
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Location: North Alabama C+ Mafia-Kingpin
GJgo wrote:

The Sylvanias do sound best, but they are $$$, hard to find, and good luck with how matched they actually are.


The matching of some online retailers are not at the plate or bias voltage of the Mark series Boogies, so they might not match when installed in your amp. I have seen this on more than one occasion, so buyer beware !

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PostPosted: Sat Mar 10, 2018 6:44 pm 
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Donating Member

Joined: Tue May 05, 2015 9:07 am
Posts: 109
Location: C+ City
The Sylvania's are great tubes but there are some newer production tubes I like. I use Groove Tubes 6l6R's with a #4 rating in my Simul's and my wide chassis c+. In the HR combos I have 415's and Tung Sol 6l6gc's. The short chassis HR has Groove Tubes GE reissue 6l6's. I think preamp tubes have more of an impact on the tone and feel of an amp. I use nos Chinese military 12ax7's in five of my c+'s and Tungsram's in one. I've tried almost every modern 12ax7 in the c+'s and nothing comes close to the Tungsram's or nos Chinese.

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PostPosted: Fri Mar 16, 2018 10:57 pm 
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Mark III

Joined: Sat Apr 13, 2013 3:56 pm
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Waste your money of current tubes our by one pair of 415's and =C= El 34's and be done. unless you play out and tour yearly you'll be fine forever.. Conquer on the NOS Chinese 12ax7 !!!!

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PostPosted: Sun Mar 18, 2018 6:40 am 
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Bottle Rocket

Joined: Sun Feb 11, 2018 8:22 pm
Posts: 7
GJgo wrote:
Nightswan- I didn't order the EH so I can't comment on those.

The Sylvanias do sound best, but they are $$$, hard to find, and good luck with how matched they actually are.

I wanted to prefer the 6L6 in the Class A slots because they are clearer, and have better highs & lows. However, the 6CA7s in those slots have a better midrange cut and more clarity when chording.

Thanks GJgo.


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