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Old 30th October 2010, 02:15 AM   #11
Trout is offline Trout  United States
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Just a thought here,
there is a guy on evilbay blowing out a very reasonably priced Eminence guitar speaker.
Famous Name 12" Guitar Speaker 25 watt 8 ohm Super Deal - eBay (item 150513073046 end time Nov-05-10 14:21:57 PDT)

Guy that have been buying them have had nothing but good things to say, and they are indeed the real deal.
No affiliation, just a contribution
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Old 30th October 2010, 02:21 AM   #12
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just an FYI
the guy im buying my magnavox tube amp from also has some 15" Alnico speakers for sale if anyone is interested
here is the craigslist link:
Vintage 15" alnico
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Old 30th October 2010, 04:10 PM   #13
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Yeah, as soon as I can get my vidoes on here I am going to do a demo of the Killer Ant with open back speaker cab with 12ax7's and then with a 12at7 in the power amp. This thing really is KILLER. Crushing tube overdrive at bedrooms levels. It's nice to be able to get down without having tinnitus for a few hours afterwards......
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Old 30th October 2010, 09:19 PM   #14
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I have a 1/2 watt tube guitar amp that I built. I have a Weber 25 watt Greenback clone that sounds great! The best thing about Weber, they will break in the speaker before they ship it to you. This really does make a difference. If you have to break in a 25 watt speaker with a sub 1 watt amp, it will take a long time.

Also, if you want a bit of extra low end punch, they will make the speaker with a heavier magnet if you ask them to. Also, their prices are great.
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Old 3rd November 2010, 01:31 AM   #15
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Okay guys, here is my setup. I finally got my demo together. It is a demo of the Eminence 10516 speaker in an open cabinet with a sub one watt amp.
YouTube - Blackheart Killer Ant Tube Battle Stock 12AX7 vs. 12AT7 Eminence Legend 10516
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Old 8th November 2010, 02:06 AM   #16
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Well, I guess the differences in the plate resistance of the 12at7 and 12ax7 have proven a problem. The at7 blew today. Guess Im goin to try a 5751 there instead. : )
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Old 8th November 2010, 11:55 AM   #17
45 is offline 45  Italy
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Quote:
Originally Posted by Rotus623 View Post
Well, I guess the differences in the plate resistance of the 12at7 and 12ax7 have proven a problem. The at7 blew today. Guess Im goin to try a 5751 there instead. : )
The plate resistance may affect the sound but has nothing to do with reliability.
Possibly the 'AT7 is just more delicate when overdriven.
You could also try with a 12BZ7 which has got the same gain factor of a 12AX7 but has half of plate resistance and double mutual conductance.
You can only find NOS 12BZ7's but they are rather cheap....

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Old 8th November 2010, 12:11 PM   #18
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Cool, thanks. I think I want to lower the gain a lil'. I'll let you know how the 5751's sound.
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Old 8th November 2010, 12:17 PM   #19
45 is offline 45  Italy
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Quote:
Originally Posted by Rotus623 View Post
Cool, thanks. I think I want to lower the gain a lil'. I'll let you know how the 5751's sound.
Fine.
Just in case, the 12BZ7 will need 2X heater current in comparison to a 12AX7.
Check out the power transformer to see if it runs too hot or the filament voltage is too much lower than 6.3V (or 12.6V depending on how filaments are wired up).
5.7V should still be fine.

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Old 8th November 2010, 12:28 PM   #20
45 is offline 45  Italy
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P.S.
Other choiches you have for lower gain are 12AY7 and E80CC/6085.
The 6085 may require some bias tweak and draws 2x filament current in comparison to AX7, AY7 and AT7.
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