Decade Capacitor IN-27

Decade capacitance substitution unit supplied as a kit. This example includes German‑language assembly and operating instructions printed in England, indicating distribution through Heath (Gloucester) Ltd. The instrument provides selectable capacitance values from 100 pF to 0.111 µF in 100‑pF increments, using wax‑impregnated silver‑mica capacitors with ±1% tolerance. Designed as a laboratory‑type variable capacitor for test, calibration, and circuit‑development work.

The copyright notice on the documentation reads: “HEATH (Gloucester) Limited 1971, Gloucester GL2 6EE, England.”

Technical Data

• Capacitance range: 100 pF to 0.111 µF, in 100‑pF steps
• Dielectric: Silver mica (wax‑impregnated)
• Accuracy of incremental capacitance: ±1%
• Voltage rating:
  • 350 VDC continuous
  • 500 VDC short‑term
  • 1000 VDC instantaneous test (momentary load)
• Stray capacitance: 10–15 pF at terminals
• Dimensions: 7½″ W × 5″ D × 4″ H
• Net weight: approx. 1¾ lb

Remarks

• Sold as a kit; this documented example includes German‑language instructions printed in England, confirming UK/European distribution.
• Manufactured and distributed by Heath (Gloucester) Ltd., the UK subsidiary of Heathkit.
• Functionally identical to the US‑market IN‑27; no UK‑specific variant is known.
• See also: Chuck Penson, Heathkit Test Equipment Products, USA, 2014, for historical context and model lineage.

Bausatz mit in England gedruckter deutsch-sprachiger Bau- und Bedienungsanleitung. Danach sind die Technische Daten: 100pF...0,111µF in Stufen zu je 100pF; Spannungsfestigkeit 350V bei Dauerbetrieb, 500V bei kurzzeitigem Betrieb und 1000V bei Einzelprüfung (Momentbelastung); Streukapazität 10-15pF an den Buchsen; Dielektrikum Silberglimmer.

Als Copyright wird angegeben: "HEATH (Gloucester) Limited 1971 Gloucester GL2 6EE England".

Here you find 56 models, 53 with images and 27 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Heathkit (UK) by Daystrom