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Project: T-1981 Preamp & Amplifier

Parts for repair/maintenance of the pres and amps pulled from a Wollensak/3M T-9181. The original specs aren't able to be found. Original fuse is 1.6 amp slow blo, updated to 2a 25v fast blo at the advice of a technician.

6c4 is the bias oscillator for the tape heads. While the tape portion is not part of my build I'm salvaging the pre's and amps and also attempting to "sidechain" the playback head to an input. (not sure how that will workout)

Project Items:
DescriptionSKUItem IDQtyPriceSubtotalOperations
Capacitor - CE Mfg., 525V, 30/20/20/20 μFC-EC30-20X3-5250015112$40.90$81.80
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Capacitor - CE Mfg., 350V, 50/50/50/50 μFC-EC50X4-3500015311$40.90$40.90
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Capacitor - CE Mfg., 450V, 70/40/40µF, ElectrolyticC-EC70-40X2-4500397852$40.90$81.80
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Fuse - Fast-Blow, 250V, 3AG, 0.25" x 1.25"
  • Amperage: 1.5 Amps
F-Z3AG-F1D50017771$2.75$2.75
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Fuse - Fast-Blow, 250V, 3AG, 0.25" x 1.25"
  • Amperage: 2 Amps
F-Z3AG-F20017771$2.75$2.75
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Diode - Fast Recovery, 1A, 600V, 1N4937P-Q1N49370055474$0.20$0.80
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Fuse Holder - 3AG-Type, High QualityS-H2050041271$2.06$2.06
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Vacuum Tube - 6C4 / EC90, Triode, Medium-MUT-6C4_EC900046541$6.90$6.90
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Vacuum Tube - 6EU7, Tung-Sol ReissueT-6EU7-TUNG0106614$26.85$107.40
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Vacuum Tube - 7591A, Electro-Harmonix
  • Single or Matched: Matched Pair
T-7591A-EH-MP0048051$57.90$57.90
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Total:18$385.06
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