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Recent content by Trio

  1. Trio

    Acousta-Stuff - Stuffing - Question

    With a couple pairs of speakers I built years ago, I used foam, and I made sure that the port opening was not covered in the process. I fitted it much as you would the foam speaker baffles when you put speakers in car doors. Out of curiosity I plugged the port from outside to see if it made...
    • Trio
    • Post #10
    • Forum: DIY
  2. Trio

    lifted solder pad, but connection is being made?

    Depends on a few things. I generall clean off the lifted portion back to where it is anchored and then lay in a short length of wire and solder that down. this creates a bridge if for some reason that foil should tear in transit and can disipate the heat better if it is in an area where...
    • Trio
    • Post #2
    • Forum: DIY
  3. Trio

    Electronic Drum Modifications

    What may have been the concern is the "attack" phase of the drum signal is largely a square waveform. If the actual output from the drum set is just square waves, the speaker cone stops abruptly at the peak and "held" until the wave form starts back down towards the zero point or zero crossing...
    • Trio
    • Post #7
    • Forum: DIY
  4. Trio

    Amplifier mod

    Those two caps are providing a low resistance/reactance path to ground for higher frequencies. Start with the smaller value first (C18.) The amp should be fine and the upper frequencies should be opened up. The 6C5/6J5 tubes are excellent audio tubes and can operate well above into RF range...
    • Trio
    • Post #5
    • Forum: DIY
  5. Trio

    Newmar 115-12-8 Power Supply help

    Rectifiers may have shorted out, the regulator may finis. If it were mine, and I salvaged a supply that was in a similar condition a few years back. I simply isolated the transformer windings to see what voltage that was and built my own rectifier bridge and regulator. in the long run it was...
    • Trio
    • Post #2
    • Forum: DIY
  6. Trio

    Ampex a423

    As a general rule, with something that age, is best to replace all the electrolytics, replace any selenium rectifiers if present, and repair power cord if needed. Setting it up for streaming music is as simple a cord from your music source into the "AUX" inputs. If some additional gain is...
  7. Trio

    Recapped a Martel FAX-150C receiver and lost the right channel

    First check for voltage at pins 1 and 6 of the 12AX7's, and pin 7 of each EL84/6BQ5's. These will give you some idea of the B voltages and where to look next. If one of the voltages is nonexistent, trace the red wires from that point back into the power supply and make sure it is not connected...
  8. Trio

    Grundig Majestic Suggestions

    Restore it or sell it. The BSR is not original, but is tollerable. They are fused, and they have a voltage selector. It is possible the main filter cap shorted out and burned up a power resistor. You should have an input for a tape recorder/deck and a line level output for the recording input.
  9. Trio

    My first Hickok

    Or do what the techs did when these were reltively new- use "Chicken feet". While it looks cramped to get at those 2 caps, it is more spacious than a "Pocket Scope" I recapped a couple years ago. While clipping wires at the body and then soldering the new cap to the leads is an option, if you...
  10. Trio

    Accurate tonality

    Actually, I have pulled a few tube amps out of phonographs, and the only "real" priblems other than available power from 35C5/50C5, 50EH7/60EH7, 25L6,35L6/50L6, 6AR5, is their initial uses which were low power amplifiers (Flea Power) and general availability and the fact many people turn their...
  11. Trio

    Warning about using a hot glue gun.

    Which is why you should be familiar with the tools and materials you use. The problem with using silicone is that it is conductive until it is cured. When I have restuffed the can type caps, I usually do not pot them, but I do take time to make sure the point of separation is concealed and...
  12. Trio

    Accurate tonality

    The ultimate answer to your question is this- "what sounds best to you?" Everyone listens for different things, different aspects of a certain type of music.
  13. Trio

    Recapped a Martel FAX-150C receiver and lost the right channel

    It is possible lead dress is an issue, if some of the electrolytics are "newish" they could be bad, sometimes even new caps can be bad from the factory- though a bit rare. if the "newish caps" are less than 1 microfarad, those that are apparent in pictures should be okay, only time there is...
  14. Trio

    Tube reverberation amplifier?

    The signal path is actually sent through the spring. You may not hear much until you turn volume up a bit and play the right kind of music. Some music it will sound like an extended sustain. Maximum reverb response sounds simliar to yelling down a corrogated culvert. If you don't hear...
  15. Trio

    GE RC1650 amplifier signal path break, PEC suspected (SE 6AQ5 +12AX7)

    Flip the amp over, set a flourescent light close by CFL will do, and do "noise injection". Follow the signal path back from the working stage- if not known, start at the output tube and work towards the input. Place the tip of a screwdriver (ideally with plastic handle.) on the signal grid of...
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