Not too long ago there was an early set with those woofer which had good pictures of the backs of them . Purhaps check search under sold completed sales for them..
On Fri, Nov 27, 2020 at 2:49 PM John van Son <
jpvanson@...> wrote:
No problem. The tweeters were Mikrofonbau HTL-1913, which are on the rarer side, but there are sadly many parted out DQ-10s out there and so second hand tweeters and baffles aren't too difficult to source. The later Advent woofers are also easy to find as plenty of The Advent Loudspeakers were sold and later parted out and new OEM replacement options are available such as this one:??
The original CTS woofers would likely be cheaper because they sell cheap on the used market, but you'd have to know exactly which model and I've not yet found someone with a sub-1000 pair who is able to share with me what might be printed on the magnet's backplate. Going to the Advents will require enlarging the hole and moving the internal braces, but the instructions for that are in the file's section:?/g/DahlquistSpeakers/files/Service%20Documents/DQ-10/DQ-10CompanyDocuments.pdf?
The capacitors will need changing. These are early Temple brand bipolar electrolytics and those aren't good much past 15 years. (Generally, if you see black caps with red ends in a crossover, plan on replacing them. Seems the worst offenders were all that color scheme.) That carbon composition resistor on the supertweeter probably does too since those love to such up moisture and change in value quite significantly, but as the supertweeter was crossed at 12kHz, the need isn't pressing there. The sandcast resistors should be good, too, unless crumbling as sometimes happens. They don't look toasted, at least.
As the others have said, this will definitely be a labor of love and something that should be approached from the aspect of having fun fixing them up rather than from monetary considerations. Not many of these early units from 1973 survive, so there's something to be said for the novelty of saving the vanguard of a model that's achieved legendary status in audio circles and often gets credited among the top 50, even top 10, speakers ever made. However, it would be cheaper to buy another later pair that's complete and go from there.
