Finally completed restoring the Large Advent Collection that I have here, including the following models listed below, and pictured here:
And here for the 5012/O:
All speakers were restored with 1% polypropylene caps with resistors added to approximate the original ESR. Re-foamed with the correct foam and original dust caps were retained since they have a strong influence on the midrange characteristics of the woofer. T&S parameters tested both in free air and in system. All XO components tested for value and DC resistance. Tweeters T&S parameters tested. All non gas tight connections tested for DC resistance (<.005R) and treated with DeOxit.
Please note that I have used 1% caps because the original caps often measured better than 5% and I did not want to use inferior value caps, and also did not want to have to hand select each one. All old components that were reused were tested for value. New components were also tested as a QC check simply to verify the correct value. All of these speakers are otherwise completely stock with original fiberglass stuffing in the OLA and 5012/O, and foam stuffing in the NLA. You will probably not find better restorations anywhere.
1. Original Large Advents (OLA) from 1972 owned by my family since new. One woofer replaced.
2. New Large Advents restored as above. Tweeters replaced due to what was believed to be ferro-fluid issues. New linen grille cloth.
3. Jensen 5012/O the /O indicates real oak veneer cabinets. Also restored as above. All original drivers.
I've given all of these speakers a listening check and they are free of any strange noises or distortions, and are well balanced side to side.
I continue to be highly impressed by the OLA (with 4dB of BSC) where they compete and in fact beat many modern designs. They are set up in my listening room in case anyone from Stereophile (I believe that you have at least one reviewer not too far from me here in CT), Affordable Audio, or others would like to hear them and perhaps review any of them. I expect that I'll be keeping these for at least a year, but they do take up a lot of space and my only intent was to restore them for historical reasons. I do tend to hold onto things that I put so much work into.
Might make an interesting article on how to build an excellent budget system with main speakers (Advents with BSC) costing less than $100. These would work well for HT without a sub, and even better with a pair of budget subs such as the HSUs.