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Official Ampeg Portaflex Club

#8,024
The difference between a straightback 810 and the 'newer' towel bar models is too incredible to describe. If you ever have the chance to compare, jump at it and be converted. Whatever the head - the oldies have much more clarity, frequency response, low end, punch and what have you. TheDialog - screw that dolly off and put it straight on that nice wooden floor of yours, and you'll be even more amazed.
 
#8,030
I am new to talk bass and wanted to share my experience with ampeg amps with other like minded folks. I have been following some posts about a portaflex club and wondered how to join. I own a few of these amps and had some questions for those who have used them for a while what I should expect as far as performance and reliability goes. Also i am seeking advice on tube selection for possible replacement. I just finished a restoration on a 1969 B-15N, including a second cab, but need some advice on the internal damping material that should be used. Any one out there know what should go against the back panel of these cabs? Both of mine had no material, just a lot of staples. Any way , I look forward to hearing from anyone who has some useful information.
 
#8,031
Back in the day, they used a sheet of fiberglass insulation. Nowadays they use foam of some sort. But if you want to be legit for the time frame, yellow fiberglass.

BTW, I'll add you to the club on Monday. My master list is at home and I'm on the road for a couple more days.
 
#8,033
Finally got too greedy while tightening the grille cloth under the broiler: :hmm:



cloth_melt.jpg
 
#8,034
I will try to find some insulation that is thin enough to not cover up the port on the bottom of the cab. I'm guessing that this is critical to get the low end performance out of it. I will try and get some pictures up for this set up. It looks pretty slick in it's new skin, courtesy of Fliptops. net . I took pictures of this project from start to finish and would love to share the story of this amps resurrection at some point, I just don't know how to post the pictures yet. Thanks for the info!
 
#8,036
bpman said:
I will try to find some insulation that is thin enough to not cover up the port on the bottom of the cab. I'm guessing that this is critical to get the low end performance out of it. I will try and get some pictures up for this set up. It looks pretty slick in it's new skin, courtesy of Fliptops. net . I took pictures of this project from start to finish and would love to share the story of this amps resurrection at some point, I just don't know how to post the pictures yet. Thanks for the info!
Click to expand...

That's what it looks like in my 73, but it's quite loose against the back of the cab. I should probably staple it.
 

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#8,038
ddbassGA said:
^ Why?
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Stone and concrete floors won't add to your sound, on the contrary - but wood will. Depends on the rest if your room, too, but it's always best to place cabs directly on the floor. I always do. The depth of lows will increase, and I feel response and pressure at higher volumes is better, too. I am sure there's a soundologist on this forum who can explain the technical acoustics.
 
#8,039
Oops! I meant why does the flatback sound better than the towel bar 810? And how is it better? I just always figured the towel bar was a more easily moveable version with about the same air volume and driver config. I have an early ('75) towel bar 810 now, but I am 40 years late to the 810 party --- a B15 freak since '66.
 
#8,040
Vintage-Blue said:
Finally got too greedy while tightening the grille cloth under the broiler: :hmm:



cloth_melt.jpg
Click to expand...
Ouch! Eats away at the soul, doesn't it? I did that with a heat gun to my 810 grill that I just changed a month or so ago, and had to redo it. Just makes you feel so bad about life when it happens! ;)

Nouroog, yours is pink, eh? I seem to remember the insulation in my 77 being yellow. No matter, I spose. But you don't have to use fiberglass at all if you don't want to these days. It's period correct but I'm finding it hard to care. Thinking about redoing all my cabs with polyfill sheets. The fiberglass gets all torn up from the cables.
 

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