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Wednesday, September 30, 2015

211 -The Next Generation- Part 11 : 801A/211 tower, amp assembly

Hi!

The next set of 801A drives 211 amplifiers shares exactly the same circuit with the already finished amps. But it will be in a different chassis in 'tower style'.




Everything will be mounted on metal plates, stacked above each other:




The top plate carries the two tubes and the signal transformers:




The bottom side of the top plate showing al the signal wiring:




The small transformer on the top left is the input transformer which is wired 1:4. This way the amp has a sensible input sensitivity with only two stages.

Handles and vertical mounting bolts added:



Capacitors and chokes are mounted on a sub assembly and pre wired:




The sub assembly added to the amp:




The amp ready for testing:




In the next part I will show the assembly of the power supply.

Best regards

Thomas

3 comments:

  1. Hi Thomas,

    Very clean build (again..) I like the minimalist look on top. For this build you use 1:4 input transformer ratio for the 801A. For your 45/45 amps do you use a higher ratio like 1:8? Thank you.

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  2. Hi Rick,
    I select the step up ratio depending on the gain needed in the system in which the amp is
    going to be used. I try to keep the step up ratios as low as possible

    Thomas

    ReplyDelete
    Replies
    1. Hi Thomas,

      Thanks for the reply. That was helpful info..

      Regards

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