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Alps stepped sealed volume control with loudness - better, more accurate than the original.
New balance control - super accurate and balanced
Original bass and treble pots were cleaned, lubricated and treated with Deoxit
All original rocker switches were removed, cleaned, lubricated and treated with Deoxit.
The switch panel was reworked with new Panasonic film caps and Vishay and Takman 1% resistors and all new wiring.
Original power switch, new neon orange bulb and resistor, cleaned, lubricated and treated with Deoxit
The selector switch is part of a comprehensive upgrade that includes relay controlled signal switching. The wires running from this selector carry only low voltage signals to control the relays. No audio signal running all over the interior being subject to interference
The rear input panel has gold plated RCA jacks and now features 5 high level inputs for any high level source like a tape deck, CD player, tuner etc. There is s single low level phono input set up for moving magnet (MM) type cartridges / turntables
The tape loop / tape monitor function is still active and works just like the original design.
The power transformer is original to the unit and tested perfect and works flawlessly.
The old multi section filter capacitor is replaced with a solid state regulated type that is light years ahead of the old design and is much quieter and more reliable
The high filter switch is converted to a single function now which turns the tone controls on or off, a great feature for the "purist" listener
The circuit boards are all new and feature high grade film capacitors, metal film resistors and low noise transistors for reduced distortion. Each board also has an LED to indicate the board is powered and functioning. These boards are incredibly accurate and super clean. This preamp will readily compete with preamps costing 4 times the price.
With its original chassis, faceplate and cover this PAT4 is deceptive, it looks bone stock. Turn it on and the magic shows up. Your friends will be amazed, until you show them the "under the hood" goodies
The AC accessory sockets were eliminated to further educe interference.
Four new rubber feet were installed on the bottom.
The chassis is very nice and this unit plays just incredible.
Nearly 40 hours went in to the refurbishing and building this PAT4 and over $350.00 in parts alone, not to mention the initial purchase price of the PAT4 itself.
A great addition to any vintage or more modern system or collection