Product Overview
Motorola 330k Ohm 1/2W Carbon Composition Resistors - NOS File Card Pack of 10, 10% Tolerance
Condition
Unused NOS. Ten carbon composition resistors on the original Motorola file card. Brown axial-lead bodies with orange-orange-yellow-silver color bands. Card markings legible: 6-185B81 on the front tab, 54-84066A05 on the reverse, stamped parameters 330K10-1/2 confirming 330k Ohm, 10% tolerance, 1/2W. Minor scuffing and light edge wear on the card; resistors show no signs of use. Sourced from an electronics distributor consolidating inventory.
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Product Overview
Motorola 6-185B81 - a card of ten 330k Ohm, 1/2W, 10% tolerance carbon composition resistors in the original Motorola file card format. Reverse of the card is printed by the Motorola Communications Division Parts Department and includes an EIA color code chart. Carbon composition construction, standard axial leads ready to solder.
Key Features
- Resistance: 330k Ohm
- Power rating: 1/2W
- Tolerance: 10%
- Type: Carbon composition, axial lead
- Quantity: 10 resistors per card
- Color code: Orange-Orange-Yellow-Silver
- Part number 6-185B81 on front tab; catalog reference 54-84066A05 on reverse
- Motorola Communications Division original packaging
Applications
- Desoldering a failed carbon comp from a vintage tube radio chassis and dropping in a period-correct replacement to keep the original circuit character intact
- Restoring a tube amplifier where carbon composition resistors are specified for their known noise and tone contribution in audio stages
- Ham radio equipment repair where original Motorola components maintain period accuracy in the rig
- New builds targeting a period-correct look and feel, where brown-bodied carbon comps with visible color bands matter as much as the electrical value
- Makers and hobbyists experimenting with vintage component aesthetics in art builds, prop electronics, or retro-styled projects
Frequently Asked Questions
Are these carbon composition or carbon film resistors?
Carbon composition. The brown axial-lead bodies and the part's era are consistent with carbon comp construction. Carbon film is a later technology with lower noise; these are the earlier, noisier type that vintage audio restorers and tube amp builders specifically seek out.
Will 10% tolerance work for a critical audio or restoration circuit?
For most vintage tube radio and amplifier restoration, 10% tolerance is the correct spec - it matches what was originally installed. For high-precision or low-noise modern circuits, metal film resistors are the better choice. These are intended for vintage and period-correct applications.
Is this the full card of 10, or are resistors sold individually?
This listing is for the complete file card of 10 resistors as shown in the photos.
What does the reverse catalog number 54-84066A05 refer to?
It is printed on the reverse of the Motorola Communications Division Parts Department card. The 6-185B81 part number on the front tab is the standard ordering number for this resistor value and package.
Ten brown carbon comps on a Motorola card - the kind of part that kept radios talking and amplifiers singing decades before anyone called it vintage. Drop one into the circuit and it picks up right where it left off.
