Forum Top Banner Ad

Collapse

Ebay Classic organs

Collapse

Announcement

Collapse
No announcement yet.

Hibernated Hammond M-101 Gone Quiet

Collapse
This topic is closed.
X
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Hibernated Hammond M-101 Gone Quiet

    My Hammond M-101 sat in a room for a few years unused after I moved house.

    I recently removed, flipped over and re-screwed in the four transport bolts, connected the organ to the mains and turned the organ on in the correct way.

    The amplifier seems to be making a quiet hum (it's alive), but when I set tabs, turn up the volume pedal and play keyboard keys, no sound comes out.

    I opened up the back. All valves are glowing happily, except perhaps the amplifier's 6AU6 and the 12AX7 valves - difficult to tell, as those valve are encased in aluminium covers.

    I note from the amplifier (chassis at the bottom on the left as I look in the back), that the 5U4 valve is missing. I once had the organ repaired by an engineer and he never commented on that missing valve, so I assumed that it does not need to be there?

    Please could anyone give me hints as to what the problem might be, so that I can get my beautiful Hammond working again?

    With kind thanks in advance.
    Last edited by Composer; 04-09-2018, 09:08 AM. Reason: corrections

  • #2
    Originally posted by Composer View Post
    My Hammond M-101 sat in a room for a few years unused after I moved house.

    I recently removed, flipped over and re-screwed in the four transport bolts, connected the organ to the mains and turned the organ on in the correct way.

    The amplifier seems to be making a quiet hum (it's alive), but when I set tabs, turn up the volume pedal and play keyboard keys, no sound comes out.

    I opened up the back. All valves are glowing happily, except perhaps the amplifier's 6AU6 and the 12AX7 valves - difficult to tell, as those valve are encased in aluminium covers.

    I note from the amplifier (chassis at the bottom on the left as I look in the back), that the 5U4 valve is missing. I once had the organ repaired by an engineer and he never commented on that missing valve, so I assumed that it does not need to be there?

    Please could anyone give me hints as to what the problem might be, so that I can get my beautiful Hammond working again?

    With kind thanks in advance.
    The 5U4 definitely needs to be there, unless the organ has been converted to a solid state rectifier (a bunch of diodes) sometime in the past. Not impossible, people sometimes do that.
    Current organs: AV, M-3, A-100
    Current Leslies: 22H, 122, 770

    Comment


    • #3
      Thanks Enor. I'll check this, though he organ was working before without the 5U4 present. I can't see a bunch of added diodes, though these may be inside the amplifier casing which I've not yet opened.

      Comment

      Working...
      X