This listing is for a vintage XXD ballast/current-regulator tube with the uncommon brass collar base.

It comes from a lifetime radio/TV repair estate we purchased in full.

The original owner stored thousands of tubes indoors for decades, carefully organized and protected.

We are now sorting and listing the entire collection.

The XXD is an early pre-war ballast tube used in 1930s–early 1940s AC/DC radio sets to regulate heater and line current.

Collectors value these tubes because they are difficult to find and essential for accurate restorations of early radios.

The brass collar and domed top make this a classic display piece in addition to its functional use.

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🔧 Condition

• Estate-stored early tube

• Brass collar intact

• Chrome dome top clean

• Internal element intact

• Some normal age marks from long-term storage

• Untested

• Please review all photos

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📦 Shipping

We will wrap the tube individually, cushion it securely, and ship it in a sturdy box.

Special care is taken with pre-war tubes due to their age and collector value.

Fast and careful shipping.

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🧾 Terms

• Sold as-is

• Untested

• Estate item

• No returns

• Please review all photos