pryso

I think my procrastination messed me up. I was delayed in taking everything apart so I could bleach the 4 cabinet pieces. That meant it was October before I got around to the bleaching. We had unusually warm days last week so I proceeded by was only partially successful. The two small back pieces are now very close to the white inside the boxes. But the two cabinet pieces were not as successful. This makes me think that temperature may be important as well as direct sunlight. Anyone else out there with a similar experience?

Kent, thanks. I should have thought of something like that. I have some plumber's putty. If that is still pliable I'll roll out a worm of that which should form a good seal. If that is too old I'll pick up a brick of the duct seal.

Hi Kent, and any others still checking this site. It has been awhile but I'm finally beginning my 400 restoration. My cases are badly yellowed so I just bought 16 oz of the 40V creme developer and disassembled everything. As seen in the photo, my speaker has a whizzer cone and fabric surround. No Phillips name but stamped Made In Belgium. Part of a serial # can be seen in red - AD 5061. The overstamp (assume Advent's) is Nov 26 1975. Also my cabinet is marked 8 ohm as well if anyone still wonders about that. I do have a question. The cone and surround appear to be in very good condition. But there was a dense black foam with tape backing applied around the opening on the metal plate to which the speaker is mounted. The photo shows how deteriorated. This forms a seal when the assembly is mounted inside the cabinet. So is there a commonly available replacement for that?

Thanks Kent, a great tip. I'm dealing with a couple of health issues but hope to soon pull out my 400 and at least do the bleaching with the two cabinets while summer is here. The electronics may wait a little longer. I'll post results eventually. BTW, love your Gromit image!

Hi Kent, I appreciate your follow up. After moving 2/3rds of the way across country last summer and some health issues this year I'm way behind on several projects. One of those being the Advent restoration. ButI want to complete that so I can use it in the kitchen while fixing meals. When I saw your photos I was going to ask about the black paint you apparently used on yours. That looks good. But then re-reading a couple of previous posts on applying peroxide suggests I should try that first. If not successful then the black paint would be my next choice. Either color will match where I'll place it. Now to get going on things! ;^)

Kent and others, I'm very pleased to find all the information on this link. I have a 400 in very good cosmetic condition, except for the yellowing, and I'd like to give it a tune up. I know very little about electronics but do fairly well with soldering so hope I can join those who have been successful. I suspected at the very least the electrolytics should be replaced. In particular the cabinet restoration should be useful. I'd planned to paint mine. :^( I also had a KLH Model 8 that I hoped to restore but never found the time. A friend who is a speaker manufacturer put me in touch with someone associated with the new KLH and we worked out an agreement of sale. Some may be disappointed to hear that but I sold the KLH for more than the Advent is worth and I could only use one. It may be a few months but I'll report back on how successful I am. Thanks again.