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Ampeg B-15 thread... first ever?

Nice one, Matt. She looks pretty clean too. My B-15 is a mess -- But runs extremely smooth.

I think that I'm sold on the B-15S. It seems to have all the features that I need. Obviously it will sound different due to the solid state rectifier, but has anyone a/b'd the B15N and the B15S? If I can get half the tone out of it, I would be satisfied.
 
Hey, madlee, does your cab have some screws or bolts that are visible from the inside? Mine has some that appear to hold the baffle on, but I haven't had cause to try unscrewing them. I'm thinking they may hold the two baffles together or something. Or is the Theile cab a single baffle design? I don't recall what I've read on this. At any rate, it sure looks like you could disassmeble that part of the cab with those screws.

Matt


yeah, it does have the screws, but it looks like it screws into the baffle board. I just wanted to "tighten" everything up to eliminate any rattles...
 
Nice one, Matt. She looks pretty clean too. My B-15 is a mess -- But runs extremely smooth.

I think that I'm sold on the B-15S. It seems to have all the features that I need. Obviously it will sound different due to the solid state rectifier, but has anyone a/b'd the B15N and the B15S? If I can get half the tone out of it, I would be satisfied.

check this one out...

http://cgi.ebay.com/1970s-AMPEG-B-15S-Portaflex-Flip-top-Amplifier-Cab_W0QQitemZ190077543029QQihZ009QQcategoryZ118983QQrdZ1QQcmdZViewItem
 
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yeah, it does have the screws, but it looks like it screws into the baffle board. I just wanted to "tighten" everything up to eliminate any rattles...

Interesting. I just spent some of the morning tightening things up on my cab, too. I had some rattles on certain notes, so I got into the cab and found that about every screw in it was loose--the screws holding the speaker to the baffle, the screws going into the baffle, screws holdning the handles and clips on. After tightening them all up I've eliminated a lot of the rattles. Still have some noise from the grill cloth, though. If anyone has any thoughts on that let me know.

Also, I think I may have mistakenly mentioned in this thread, or perhaps another one, that the B15N Theile cab was a dual baffle design. It's not, as I'm sure many here know.

Matt
 
Another interesting note (at least to me): Yesterday I added some furniture stuffing type batting to the sides of the cab, as well as the top of the board on the bottom, which is part of the port structure. Definitely helped to focus that sort of--not sure if this is the right way to describe it, but it makes sense to my ears--ambient low end. Also seems to have eliminated the "frapping" of the grille cloth, maybe due to a little less woofy air flying around?

Oh, yeah. I'm a master with the technical terms!

Tomorrow I'm going to pop in an Eminence Legend speaker and take it for a test drive. I was looking for a speaker to pop in there for the day-to-day general use and abuse I'll throw at it with my gigs and rehearsals and whatnot, and I found a nice deal on this one. I plan to keep the original speaker on hand and in its present good condition. I have a buddy who owns a studio and wants to rent the amp from time to time for recording. I figure I'll put the old speaker back in for those situations, so his clients can go appropriately ga-ga over the vintage thing!

(Pretty cool to have an amp make you a little cashish when you're not even there!)

Hey, on another note, anyone have any idea what the reasoning was behind the removeable board that creates the port structure in the Theile cab? Seems kind of unusual compared to other cab designs I've seen. I bought a clutch bit today just, just to cinch that port piece down, as it had come loose a bit over the years, just like every other screw in the cab. That seemed to mellow some vibrations out a bit, too, and, now that I think about it, maybe that contributed to the diminished grille cloth vibration...

Matt
 
Does the "W" equal the same sort of differentiation in 6L6WGC vs. 6L6GC? Mil-spec vs. standard?

Yep, BUT it's an abused term. Lots of modern day manufacturers like Sovtek insert a "W" into a tube designation that doesn't actually meet mil-spec. Unless it's a genuine old US made tube, a every "6L6WGC" will not be mil-spec. The difference with 6SL7's is that nobody's trying to market a 'fake' "W" version
 
I recently spotted a B15(N, I think) at a little music store in my area. Price tag on it is $500 CDN (about $440 USD). It looks well used but in decent shape. Doesn't appear to come with the original cab, unless it's in a back room somewhere.

Didn't have time to play with it, bu just wondering what folks think about the price, assuming the thing is in decent working order. Seems like they go for around $500- $600 USD with the original cab. I've read that replacing the transformer(s?) is a costly hard to find... anyone have experience with that? Would playing one of these through a 210 cab be a sin?

Thanks, Dave.
 
I recently spotted a B15(N, I think) at a little music store in my area. Price tag on it is $500 CDN (about $440 USD). It looks well used but in decent shape. Doesn't appear to come with the original cab, unless it's in a back room somewhere.

Didn't have time to play with it, bu just wondering what folks think about the price, assuming the thing is in decent working order. Seems like they go for around $500- $600 USD with the original cab. I've read that replacing the transformer(s?) is a costly hard to find... anyone have experience with that? Would playing one of these through a 210 cab be a sin?

Thanks, Dave.
Without the cab this is a bit pricey.

Yes, the transformers, ouput and power transformers, are not cheap (check fliptops.net for parts, when they have them).
The OT is the one that makes all the difference. Vintage/original are, IMHO, making the sound of the B-15. New/re-issues are not the same thing.

Before you buy it, ask to try it, if it doesn't power up or no sound is coming out, don't even bother, you might be in more trouble than you want to, especially if you're not ready to replace parts yourself.
 
Why does this guy need 8 15" portaflexes? what's even weirder is that they are all the same vintage... I can understand having a 15" blue check and a 15" thiele, and maybe a 12" or a 2x15" or all the various configurations, but 8 B-15N portaflexes?

link to ebay
 
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I hate asking inane questions about pricing but here goes anyway! Im not paying attention to how much B-15Ns are selling for but I still want one. What is a reasonable price for a nice condition 70s B-15N?
 
Here’s my 1966 B-18-N, I had Rob Hawkins go thru it to put in back to factory spec. All it needed was the speaker re-coned. The original tubes tested at 95% or better so we left them in. Rob did install a solid state rectifier and he also talked me out of having it recovered. This thing sounds great!
EBMMopenhouse001.jpg


I also picked up this setup off eBay for 1200.00, it's in dead mint condition. While this rig sounds great and is way louder it just doesn't come close to the old B-18-N. :D

DSC01867.jpg
 
I hate asking inane questions about pricing but here goes anyway! Im not paying attention to how much B-15Ns are selling for but I still want one. What is a reasonable price for a nice condition 70s B-15N?

I got mine for $775. bonus for having original ampeg labeled sylvania preamp tubes, (2) RCA black plate 6L6-GC, and a mullard 5AR4. It's in pretty good shape. It was filthy when I got it and I cleaned it up a bit. only negatives were: a few nicks in the tolex, specifically one slightly noticable tear at the bottom.

and the top of the amp between the transformers was coated in this gook that rusted the top a bit.

here she is:

http://www.talkbass.com/forum/showpost.php?p=3646600&postcount=74
 
I also picked up this setup off eBay for 1200.00, it's in dead mint condition. While this rig sounds great and is way louder it just doesn't come close to the old B-18-N. :D

DSC01867.jpg

Interesting to see the porting on the B-15R in this photo...

have you hooked up your B-15R cabs to your vintage B-18?

would be cool if you could compare/contrast the new cab with a vintage B-15N...

I don't know that much about amps and cabs. I've been thinking about building an B-15N cab clone out of italian poplar and putting a neodymium driver in it, specifically to have a lightweight portable amp for my oliver heads. Although, a B-15N cab with just the speaker and no amp, actually isn't that heavy...so maybe I should just buy one from fliptops and spend my time actually playing music???

oh, by the way, just noticed that framed photo on the desk. I'm hoping it isn't what I think it is.
 

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