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Changing tips is not always convenient. Using the right tip for the job avoids damaging parts and PCB's from too much or too little heat. I keep a bottle of liquid flux and a jar of paste flux handy. A little goes a long way. I bought the Hakko desoldering gun last year. It's not cheap but...

The relay board uses AC voltage taken at the bridge rectifier. #22 wire is soldered on to the rectifier. There are large wires at that point you have to connect to. If you upgrade to the White Oak rectifier, the relay board AC wires have solder locations on the W/O rectifier board. Download...

You can see the write up for the relay board on EBAY. 700B output relay. If the power switch is a smallish Arrow Hart type, I have a solidstate (triac) with PCB that uses the existing power switch to control the triac. The triac does the heavy lifting. The Arrow Hart switch is nearly...

I believe that aerospace company may have been in the news a few times the last few years. I got to commission some systems at the same company's wind tunnel many many years ago.

Ed, It's good to hear form you. I had concluded you gave up on us.

Ed? Ed Blackwood?

If you’re going through all that trouble, I think it’s worthwhile to consider decoupling capacitors on opamps. Typically .1 µF film types or ceramic. If the 3000 is like my 3300 there are a number of ceramic capacitors in the signal chain which would likely benefit with equivalent film type...

The other day the wife was watching TV and I wanted to rock out. So I pulled out the Bose headphones and plugged them in. The right channel was white noise on top of the music even with the volume at minimum. The main out to the amps was dead quiet. I pulled the preamp out and off to the...

If you have an accurate meter check the 10 ohm resistor values.

According to the 400 manual, the lamps are number 1784. The fuse type is FL6.

Xcelite 99 magnetic 1/4" nut driver and extension. The magnet holds the screw. Handle is separate

What's the criteria for a failure? Those drivers usually only fail when outputs go. See the manual for options on drivers. The MJ423 would be an option if you can test the channel with a scope to verify there is no high frequency oscillation.

Mark, Did the ones I sent show up?

Did the ones I sent show up?

Would somebody please open the manual I posted (#11) and tell me if it's legible?

If you look at my post # 11 you'll find the 700/700B service manual. Did you see page 10?

Ugh! The photos show the output binding posts were replaced with gold plated versions. That's OK, but the chassis had to be drilled to accommodate them. The studs on the new posts are larger than the standoffs (4-40) supplied for mounting the board to the OEM Switchcraft binding posts. An...

. A week ago, I got off a nine day cruise in the Caribbean. I made it a point to be off-line. I didn’t want to let the world know the house was empty. It can be a struggle to keep up with everything. I went straight from the cruise ship to my Houston office and started a class next day. I...

I found some pulls in the Dyna junk drawer. Still need them?

Yes, Dynaco used the same part. Mark, I'm on the road and get home tomorrow. I should have an outlet in my Dyna junk drawer.