Recent content by nakdoc

Very clean board designs, but using green and blue wire for the rails and a white wire for ground is going to fry some brains. I'm reminded of a Jensen car amp that had a black +12 volt power wire. Smoked! Any photo detectives out there can zoom in on the filter capacitors' voltage ratings...

BA in Geology, 1975. Then moved to nashville and was an electronics tech for two different stores. I learned about high end video repairing Advent videobeams. learned audio from Yamaha. After 6 years as a tech I went independent and owned Hi tech Service. We repaired everything, which...

I put that SA100 heatsink with original matched MOSFETs on ebay yeasterday. The above article explains the gate resistors...I've always wondered what the resistors did since their values are so low compared to series gate impedance. The learning never ends!

Rebuild the cam motor for sure. Details on Tapeheads if you don't know how to properly do it. Deoxit in the brush holes is only temporary.

"get your money for nothin'"

Where is the fourth filter cap, and why are the unused solder lugs 2mm away from a flexible aluminum front panel? The fuse change was standard practice when a 400 is used for PA. SOA is a function of both current and collector voltage, so maybe the DTS 402 is pretty good with high inductive or...

The phase cap simply gets the motor to turn in the pifroper direction. Typically the motor will turn with lower AC voltages, and if it does not, you'll be able to feel 60 cycle vibrations by touching the pulley. These motors are very low torque, so bearing issues are critical. I believe I have a...

Great sounding tuners and also great for DX (distance) listening.

I have one of these amps and they will win most beauty contests. The design is very similar to the HK and NAD amplifiers. Mine is not as toasty.

Instead of air cooling the bank, dunk the loads in oil. That is what the radio transmitter guys do.

That is a repurposed Philips turntable. Replace the tubular phase cap and the motor should turn again.

You want the arm board to bond to the plinth so there is zero relative movement between arm and plinth. If they are separate, motor vibrations are maxed out by an isolated arm.

According to the NY Times obituary, Sam and Dave were not friends and did not get along. In the beginning, Dave was performing but could not remember the lyrics, so Sam got on stage to sing and guide him.

You will need to remain underground since the preamp is not UL certified. I'd advise deleting the AC outlets to reduce potential liability.

Probably sounds better....