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Hello Asylum,
I have completed an archive search on the Dyna A-25 Speaker with no real info being found. I need to get a schematic to repair the crossover since it was butchered by someone in the past. Recommendations on tweaks for this crossover would be appreciated. I also have a burned out tweeter in one unit. Should I repair it or replace the tweeters with a newer unit. Another question: Is there a source for grill cloth or would a newer material better the sound of the speaker over the old linen cloth. I have cats and dogs and the speakers will be used with the grills in place. Thanks in advance for any assistance.Brent
Follow Ups:
I and 2 friends all owned A-25's in college, 30 years ago. In just 2 years, we had lots of problems with them. The crossover capacitor appeared to go bad. The tweeter went out of alignment so that the voice coil scraped the magnet. By modern standards I expect they would be incredibly lacking in clarity. I think fixing them would be a waste of time.
In my previous post, I assumed you meant Dynaco, not Dyna. If there really is another company called Dyna, my comments should be disregarded.
NO!!! Never got the help I needed. Does anyone care to answer my questions?
i suggest a couple of things.
try to find someone with say a single a25 witha good xover and tweeter.
i do think keeping the orig tweet will give the smoothest transition but a friend put a titanium tweet in place of his big domes and liked the result, even tho it left a small hole in the mids.
finding a single spk will give you a xover board to copy. good time to update caps and resistors and make 2 new boards.
to extend my top on the a25s, i had used a 0.5 uF cap in a std config with a pot in the circuit to pad the tweet down with. that ran in paralell with the spk, and after a month, i reversed the absolute phase of the tweets and WOW! the top opened way up, so be sure to try both phasings.
dont expect accurate imaging from the a25s, they just werent phase coherent top to bottom. bass quality was exemplary tho, similar in tightness and extension to original quad ESLs. midrange clarity wast the last word but i loved em!
ultimately, i used a pair stacked horizontally in parallel with the philips tweet balanced on the front inside edge of the spk.
in this config, i had to reduce the bass output as it was too fat.
hows that for too much information?
......regards.....tr
rudeness is acceptable there.
......regards.....tr
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