Description:Matched Pair of Ultra High Voltage Soviet K75-24 0.33uF 1600V 10% PIO (Paper-in-Oil) Audio CapacitorsUp for sale is a rare, closely matched vintage pair of high-quality, ultra-high-voltage Soviet hybrid Paper-in-Oil (PIO) and Polyethylene Film capacitors K75-24. Both units come from the exact same production batch, manufactured in April 1990 (Date code: 9004) and feature the official Soviet state quality control mark "OTK".Rated at a massive 1600V (1.6kV), these heavy-duty capacitors are highly prized and strictly required by audiophiles and custom tube amplifier builders working on high-voltage single-ended (SET) designs (such as 211, 845, or GM70 tube projects) where anode supply voltage easily exceeds 800V-1000V. This incredible voltage rating provides an absolute safety margin, bulletproof reliability, and zero risk of dielectric leakage.The 0.33uF capacitance value combined with a 1600V rating makes them ideal for critical interstage audio coupling, signal paths, and high-voltage bypass networks. Hermetically sealed in robust green cylindrical metal bodies, they feature full-length flexible wire axial leads, which are highly preferred by builders for clean point-to-point vintage audio installations. They deliver the legendary smooth, deep, and warm analog musical tone that vintage Soviet PIO dielectrics are famous for worldwide.Key Features and Specifications:

• Model: K75-24 (Ultra High Voltage Block)
• Capacitance: 0.33 uF (Microfarads) / 330nF
• Tolerance: +-10% (Standard audio grade precision)
• Voltage Rating: 1600 V (1.6 kV) DC/AC (Extreme safety margin for High-End tube gear)
• Dielectric: Hybrid (Paper-in-Oil combined with Polyethylene/PETP film)
• Case Material: Hermetically sealed metal body with green protective sleeve
• Date Code: 9004 (April 1990)
• Quality Grade: OTK stamped (State Quality Control)

Condition:

• Status: New Old Stock (NOS).
• Cosmetic condition: Pristine vintage condition with full-length flexible wire leads, exactly as shown in the photos.
• Testing: Visually inspected and guaranteed authentic.

Perfect For:

• Ultra-high-voltage tube amplifier coupling and interstage circuits (845, 211, GM70, etc.)
• Premium loudspeaker crossover networks
• High-end DIY audiophile upgrades where supreme voltage handling is mandatory
• Vintage studio equipment maintenance and boutique amplifier creations

You will receive the exact matched pair of 2 ultra-high-voltage 1.6kV capacitors from the unique 1990 batch shown in the photos.Shipping and Packaging:
Worldwide shipping with a tracking number provided. Due to the solid weight and size of these components, they will be securely packed in thick bubble wrap and a sturdy cardboard box to ensure safe transit and protect the wire axial leads.If you have any questions, feel free to ask before buying!