• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

hf-20

  1. Walter R

    Eico HF-20 THD Evaluation

    My bedroom stereo has two monaural integrated Williamson amplifiers. One is an Eico HF-20 and the other was made by Elmat but appears to be an HF-20 clone. The Elmat has the same tube lineup and controls as the Eico but the power transformer appears different. I was curious about the THD of...
  2. Walter R

    HF-20 Power Supply Problem

    My two HF-20s that I just dusted off after 15 years operated great for 10 hours continuous. Then one of them went mute. Tube pin voltage checks (I have pin test adapters) indicated that there was no plate voltage to V1 and V2, both 12AX7s. The other tubes had plate voltage, but it was about...
  3. Walter R

    Good Speakers for HF-20

    I’m new to Audiokarma. My backup vacuum tube stereo (in the bedroom) is a pair of Eico HF-20s. I bought them 15 years ago when they were still inexpensive and just dusted them off. Right now I’m using them with a pair of Optimus Pro 7 speakers that I already had in my ham shack. Can anyone...
  4. Eico HF-20's

    Eico HF-20's

    I've recently acquired a pair of vintage Eico HF-20 mono amps. Basic P-P Ultralinear Williamson circuit with the new 6L6WXT's from Sovtek and some homegrown circuit modifications have made these really sweet. I added oiled oak sides and turned oak knobs for a cosmetic lift. These aren't yet...
    • Rob
    • Media item
    • eico hf-20 tubeamp
    • Comments: 1
    • Category: Member's Tube Gear
Back
Top Bottom