Product Overview
Motorola 3.3M Ohm 1/4W Carbon Resistor File Card - 10 Units, 10% Tolerance, NOS Vintage Pack
Condition
Unused NOS. Card tab markings legible: 6K129011 and 3-3M10-1/4. Ten axial-lead resistors present with brown bodies, orange end caps, and green center band. Light edge wear on card corners. Sourced from an electronics distributor consolidating inventory.
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Product Overview
Motorola 6K129011 - a vintage file card pack of 10 carbon resistors, 3.3 Megohms, 1/4 Watt, 10% tolerance. Card back printed with R.E.T.M.A. color code chart and Motorola Communications and Electronics Inc. reorder text. The Orange-Orange-Green-Silver band configuration on each body matches the stamped electrical specifications exactly. A period-correct component for vintage electronics work.
Key Features
- Resistance: 3.3 Megohms (3.3MΩ)
- Power rating: 1/4 Watt (0.25W)
- Tolerance: 10%
- Quantity: 10 resistors per file card pack
- Color code: Orange-Orange-Green-Silver
- Card tab stamped: 6K129011 and 3-3M10-1/4
- Card back: R.E.T.M.A. color code reference chart printed
- Axial-lead, brown body with orange end caps
Applications
- Desoldering a drifted or failed high-value resistor from a vintage tube radio or tube amplifier and dropping in a period-correct NOS replacement to bring the circuit back to original spec
- Restoring vintage communications gear where carbon composition parts preserve the original circuit character and visual authenticity collectors expect
- Building period-correct audio circuits or tube amp projects where the tonal character of a vintage carbon resistor is part of the design intent
- Retro computing builds and DIY hobbyist projects that call for a high-value 3.3M resistor in a timing network, voltage divider, or bias circuit
- Stocking a small restoration shop or bench kit with NOS high-value resistors pulled from original manufacturer card packs
Frequently Asked Questions
Are these carbon composition or carbon film resistors?
The card tab and research notes describe these as vintage carbon composition or carbon film - both types share the same physical form factor and color-band markings. The specific resistive element type is not confirmed from markings alone. For most vintage restoration work, either type is functionally appropriate at this value and rating.
Is the full pack of 10 included?
Yes. Ten axial-lead resistors are present in the file card as pictured. The card itself is included.
What color code confirms 3.3 Megohms at 10% tolerance?
Orange-Orange-Green-Silver: Orange (3) - Orange (3) - Green (×100,000) = 3,300,000 Ohms (3.3MΩ), Silver band = 10% tolerance. Each resistor body shows this configuration.
Will these work as replacements in tube radios and vintage audio equipment?
Yes. A 3.3MΩ 1/4W resistor is a common high-value part in tube radio grid-leak, bias, and coupling networks. These are NOS vintage components - period-correct for restorations where original carbon resistors are being replaced.
Some parts come with a card and a chart - this one comes with a story. Forty-plus years in original Motorola packaging, and they still read exactly what the tab says they are. Your bench, your call.
