Announcement

Collapse
No announcement yet.

ampeg v4 - two adjustable biases for each output set

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • ampeg v4 - two adjustable biases for each output set

    I have a v4 with an adjustable bias I added. I added a pair of 6550s - I got the amp with only one pair - and the two bias differently. One pair runs a lot hotter than the other so my thinking is the create a second bias supply on perf board and run that to say V7/8 and the stock to V5/6. That way each set can be biased to get the best dissipation.

    The bias circuit in my amp more closely resembles this schematic:

    https://www.ampegv4.com/images/schematics/V4B.jpg


    I'm thinking I remove the output of the stock bias where it goes to R35 and R36. With the stock bias control feeding R35 and the added bias to R36.

    I'd have the input for the second bias coming off the diode bride - right before C16. The ground to ground and the output to R36.

    Would that work?

  • #2
    IDK, this schematic might help you somehow!
    Also, would adding a small resistor on cathode A skew the one side a tad? If wrong side more to next output tube.

    Also with my former VT22s, adding that B+ tap thing for DC heater inject works so killer. Finally the awesome reverb loses that extra gain stage of hum and goes dark but the decay becomes clearer. Less hum majorly overall.
    Finally, easiest amp to add effects loop to- maybe one wire.
    Attached Files

    Comment


    • #3
      Originally posted by Guitarist View Post
      IDK, this schematic might help you somehow!
      There should be a series resistor between each pot and ground. This will prevent anyone from adjusting the bias to zero volts which will cause redplating and kill the tubes.

      Originally posted by Guitarist View Post
      Finally the awesome reverb loses that extra gain stage of hum and goes dark but the decay becomes clearer. Less hum majorly overall.
      No idea what you mean by this, could you clarify?
      "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

      Comment


      • #4
        So would my bias idea work?

        Comment

        bostanci escort
        sisli escort mecidiyekoy escort
        pendik escort
        sex vidio
        altyazili porno
        antalya escort
        beylikduzu eskort bayan eskort bayan escort antalya sirinevler bayan escort
        gaziantep escort gaziantep escort
        atasehir escort
        antalya escort bayan escort atakoy
        izmit escort
        ankara escort
        porno
        replica watches
        Working...
        X