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Old 15th June 2011, 05:04 PM   #101
bst is offline bst  United States
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Gimp, I'm still painfully uninformed about all the flavors of guitar speakers, but here's an 8" Peavey which may interest you (marked down from $50 to $20).

Peavey 8" Blue Marvel Guitar Speaker 4 Ohms 70777221
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Old 15th June 2011, 05:10 PM   #102
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A friend recently put a 8" Jensen C8R in his Champ, sounded very nice for 30.
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Old 15th June 2011, 05:13 PM   #103
TheGimp is offline TheGimp  United States
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The Peavey has about the same specs as the Mod, but has a heavier magnet and greater power handeling capacity. For the few dollars more it is probably a better deal.

One thing I note though is they rate it at Sensitivity: "93 dB 2.83V/1m" and it is a 4 Ohm speaker, not 8 Ohm so it is rated at 2W not 1W. This may be a typo as most of their speakers are rated in db-W/M not V-W/M.

I'm not familiar enough with Thiele/Amall parameters to intrepret them.

No info on the Pevey web site about it.

Most posts I've found are for the 12" Blue Marvel, not the 8" Blue Marvel.

Last edited by TheGimp; 15th June 2011 at 05:34 PM.
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Old 15th June 2011, 05:41 PM   #104
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I would think something like the MOD 6-15 would be nice.
I got one on the way. I'll find out.
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Old 15th June 2011, 05:46 PM   #105
Variac is offline Variac  United States
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Not to get too touchy-feely here, but if we end up with a few designs that work and are cheap and easy to make, and the designers get to show their cleverness, and get appreciation for their efforts, then a lot of "winning" will have happened , and I think that's the point of this contest, not so much declaring one design "The Best". Although there may well be a design that stands head and shoulders above the others.. we'll see..

I believe that the loudspeaker isn't part of the contest, but then you'll need one, so well worth discussing..

Last edited by Variac; 15th June 2011 at 06:12 PM.
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Old 15th June 2011, 05:51 PM   #106
TheGimp is offline TheGimp  United States
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Another surplus Peavey, this one for $15:

Peavey 8" Guitar Speaker 4 Ohms 70777082

Why a 4 ohm speaker? Designed for a Solid State amp?
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Old 15th June 2011, 06:09 PM   #107
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Have you ever played a tiny watt amp through a 4X12. Sounds kinda dead and lifeless. I ordered a cheap 6 inch Jensen and an Alnico 8 inch Jensen for sound testing. I have a 2X10 cabinet with EV speakers, but it needs at least 50 watts to come alive and likes about 200. It is eating 200 watts in the picture below.
My 4x12 comment was just to make a point, of course, but I do have a question: Are there any largish speakers that would sound good with this project? I know that most builds will be purposefully small in size, but I can't help but think that a 5 watt tube could drive the right 12" or even 15"(?) speaker nicely. What do you more experienced guitar amp guys think? Is there such a speaker?

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Old 15th June 2011, 06:59 PM   #108
TheGimp is offline TheGimp  United States
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It depends on what kind of sound you are after. The Greenback I have sounded good with a class A 3W amp, but it is a 5F1 (Champ) offshoot and was played clean.

Look for low power rating and high efficency.
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Old 15th June 2011, 07:01 PM   #109
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I'm on a tight budget myself these days so I've thought about this too much. I'd consider using a pair of 6FJ7's and a 12AC10 with an Edcor XPP output. With sockets and shipping that should come in around $40 with shipping? Dumpster salvage a transformer that can put out around 350 to 400 vac. $20? An array of Cheap full range speakers?
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Old 15th June 2011, 07:47 PM   #110
scott17 is offline scott17  United States
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I'm not planning to enter this contest however it is a great project. This link may give some of you some good info for a direction to go. The 6AF11 is currently listed as a one dollar tube on vacuumtubes.net.

The Squirrel Monkey One Tube Guitar Amp
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