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Standard Sweden 33S29A / 6SL7GT - Extremely Rare Swedish Military

One of the rarest dual triodes you will ever encounter - the Standard Sweden 33S29A was produced in very small quantities for the Swedish military and virtually never surfaces in testable condition. Brown Bakelite base, copper support rods, triple mica, chrome dome getter - early construction throughout. Both sections test close to nominal.

Key Features

Brand: Standard (Made in Sweden) - Swedish military procurement
Tube Type: 33S29A / 6SL7GT - Dual Triode
Condition: Used, tested - both sections close to nominal; see test table
Construction: Brown Bakelite base - pre/early-war production indicator; triple mica; copper support rods; chrome dome getter - exceptionally rare construction combination that disappeared from production decades ago
Base: Octal K8A
Heater: 6.3V / 0.3A
Quantity: 1 tube

Test Results

Uh=6.3V | Ua=250V | Ug1=-2.0V

Section	Ia (mA)	S (mA/V)	Nominal (100%)
T1	2.2	1.5	Ia: 2.3 S: 1.6
T2	2.1	1.5	Ia: 2.3 S: 1.6

Equivalents

33S29A = 6SL7GT = 6SL7GTA = VT-229 = CV1985

Note: VT-229 is the US military designation for the 6SL7GT. The 6SL7GT is a high-mu dual triode - not interchangeable with the 6SN7GT without circuit redesign. ECC35 / CV569 is a related British type with higher heater current (1.0A) - always verify before substituting.

Shipping Information

Shipped via registered airmail with tracking for secure delivery.

Other international shipping options are available upon request.

For US buyers: Import duties and customs fees are covered by the seller. Shipment is sent DDP (Delivered Duty Paid). Buyer will not be charged additional import fees.

If you know what this is, you already know you need it. Swedish military small-batch production with brown Bakelite base and triple mica - there is no second chance on a tube this rare.

SKU: 591