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Same thing I use to clean the boards prior to soldering. For cleaning the flux off, I use this: The MG Chemical people in Canada make some good stuff.

What do you use to clean the flux from the board? Apparently, it is working!

In the 1970's, listing what I can remember, which is more than 1 or 2: AMF (Harley Davidsons) appeared in the motor company showrooms. The Beatles broke up in 1970. The Kent State Massacre happened in 1970. The Munich Olympics Massacre happened 1n 1972. The oil crisis started in 1973 when I...

It looks good, very good.

Ah, the Altec 422-8Z Altec’s answer to JBL’s legendary D130 (and variants) woofers. To answer the usefulness found in JBL’s watershed D130, many years later .. Altec designed this excellent woofer -- a beautiful combination of Altec’s best 416 style Altec frame, with a special tighter, lower...

You are building the Fully-complementary version?

I was on the Internet (NSFNET) in 1986. A local guy, graduate student who advertised in the San Diego Union Tribune, set up a 56kbit/s backbone connection in his strip mall location to one of the super computers in San Diego, the San Diego Supercomputing Center (SDSC) on the campus of the...

Don, your serial number (18323) must be very near the end of 1978. It is a high number for a PL400 (not Series II).

No issue, I like mine even though it is not as accurate as I thought it would be. I would prefer that it would be a bit slow, then I could just add a minute or two each month. Because it is fast, I have to cycle through the whole hour and sometimes I get a switch bounce and then I have to do it...

I can send you an original, authentic Phase Linear strap and the associated hardware. PM me.

Does your clock keep good time? Mine runs fast about 2 minutes per month. I thought they would be more accurate with a quartz crystal generating the time clock pulses.

Ed, Are you aware of any Phase Linear 400 or 700 series transformers that failed in the field?

Send me a PM and we can discuss your new Control Board. Mark

You forgot to mention your Phase Linear 400. Come on, man!

There are several methods from the Phase Linear factory and later folks like us. You are already familiar with the glue that Phase Linear used. Here are some pictures I have of PL700B amplifier Capacitor hold down methods. The first two require a 2" #6-32 screw into the Aluminum Cradle, the last...

White Oak Audio is owned and operated by Joseph King. He is known as Geppetto here on the Forum. He is a busy guy, he will eventually get back to you.

Do you want the kit or an assembled and tested WOA Control Board for your PL400?

Happy Veteran's Day to me and all you other Glorious Bastards.

Well, I don't think Phase Linear wound their own transformers. Am I wrong here?

From their Website: "Schumacher Electric, proudly headquartered in Fort Worth, Texas, is an American powerhouse in the world of power innovation since 1947. Known for industry-leading patents and technologies, Schumacher has built its reputation through an unwavering commitment to quality and...