Special Write-Ups

Permanent links to popular articles, and abridged or expanded versions of other posts, appear below:

Getting Started with Vintage Radio and Electronics Repair: Basic Tools for the Hobbyist

Round-Up of RTLSDR Upconverter Choices

GE LF-116 Repair (Single-Page Version)

2 Responses to Special Write-Ups

  1. Daniel J Byrd says:
    May 21, 2023 at 1:28 am

    I have a question about my bose series. 1 eq.the transformer is bad what do i replace it with?

    Reply
    • jwk says:
      May 21, 2023 at 3:59 pm

      I used the Tamura 3FD-336 (available from Mouser) as a replacement. It’s not quite a drop-in — you’ll have to potentially drill a couple new holes on the board — but it works well electrically.

      It has a dual primary and dual secondary, so for a 120V application, the two primaries are connected in parallel in phase with each other, and the two secondaries are connected in series, with the connection point of the two secondaries becoming the center-tap which connects to ground on the equalizer.

      It’s been a bit, so be sure to double check the data sheet for the transformer, and of course follow any instructions you’ve read here or elsewhere at your own risk.

      Reply

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