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Most of these audio equipments use anodizing on the aluminum parts. Any type of abrasive cleaner/polish will remove the anodizing and leave you with raw aluminum. You can polish the aluminum with Flitz or Semichrome or any of the products mentioned above until they look like a mirror, but unless...

Grizzly makes cross slide vises from $640.00 to $95.00. I like the G5757 at $220.00 (free shipping) It is robust and accurate. https://www.grizzly.com/products/grizzly-compound-slide-table/g5757

28VDC is Power Supply voltage. I suspect it will be more than a cold solder joint... Is this the preamplifier with the joystick in the center of the face plate? If so, it is not worth repairing. Good design on paper, but the assembly was a hot mess.

I cannot believe no one mentioned the Tillley hat. Made in Canada and guaranteed for life! It is machine washable, has folding sides and almost indestructible. I got mine at West Marine and it was not cheap, but hey guaranteed for life, who does that anymore?

My 2005 Chevy Silverado truck had an in-line fuel filter in the frame rail and I would replace it every 20K miles. Imagine my disappointment when I went to the local auto parts store to buy a fuel filter for my 2019 Suburban... The fuel filter is inside the fuel tank! I imagine there is a lot of...

I have two Crown COM-TECH 200 rack amplifiers that were advertised as needing some help. I think I have the schematic somewhere. I wonder how worthwhile it would be to bring them back to working condition?

My understanding is that an isolation transformer magnetically couples the AC voltage to an "isolated" output jack. The ground is connected to the chassis on the input and the output to shield the transformer and still provide a path to Ground in the event of a device failure. Typically, there...

What did you leave us?

Likely the repair is more than the cost of a suitable replacement microphone. The prices of good sounding microphones have come down due to the increased number of podcast "artists".

Referencing Post #7, no Grounding jumpers are allowed here. Every Ground wire originates at the STAR Ground (between the main capacitors). That includes the Gray and White Ground wires stuffed into the Phoenix Terminal Block, one wire per position please.

Like these:

You have a transitional PL700 Series II. The change from the PL700B to the PL700 II happened in 1977/1978. Note that your RCA Driver Transistors have a 1977 date code on them. Phase Linear continued to use the transformer stickers they had in stock (likely already glued to the transformers) on...

Phase Linear chose to reduce the control board voltage from 100V to 15V with large power resistors and Zener diodes. This is not optimal as shown by the "browning" of the circuit board. The White Oak Audio Rev G1 Control Board uses two +15V and -15V precision power supplies (dedicated power...

These PL400 and PL700 Series II latching power switches are known as TV-5 (5A steady rated, 78A peak) or TV-8 (8A steady rated, 117A peak). These switches were designed for tube televisions that had high inrush current demands, and were approved and rated by Underwriter's Laboratory (UL). You...

You are a lucky guy!

First, the PL400 VU meters are occasionally available, the PL700B meters are virtually impossible to find; those would have to be aftermarket. Then, you will need to find replacement Faceplates for your amplifiers because the meter dimensions are not the same. The replacements would have to...

Kyle, Use another pair of tie-wraps on the wires that connect to the Control Board. This will help to keep them out of your way and also prevent breakage. I find that tie-wraps about 1" from the wire ends works really well.

You have already started down the slippery slope.

I like Rod Elliott's projects. I have built several including an stand alone Headphone Amplifier - P113. https://sound-au.com/project113.htm I used the best OPAMP I could find at the time, a Texas Instruments LME49860. It does sound good. I get 250mW output with the 600 Ohm Headphones.

And that very nice Volume control!