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It is currently 21 May 2019, 08:37

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PostPosted: 14 May 2019, 10:51 
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Just a few thoughts.

I was thinking about the effect of a copper chassis, ie why use copper whats the point vs aluminium etc.
Its interesting to note that in a squirrel cage induction motor, induction magnetises the rotor through induced current.

But while looking I noticed this which I found interesting:
https://www.youtube.com/watch?v=sENgdSF8ppA

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M. Gregg

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PostPosted: 14 May 2019, 11:27 
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Input board,

Kite input board wired with Duelund silver in cotton / oil using Audio Note solder.
The back of the board is sprayed with CPL which you can solder through if you need to modify.
I will probably give a timed mute start up, but it depends if its necessary.
Tufnol <<<wear a mask to stop the dust (Safety first :D )
I tend to use the CPL on the back of boards but not the front.
Its a good way to stop Vero tarnishing and give higher voltage protection.
I had the old can a few years. CPL can also be removed with IPA 170.

Regards
M. Gregg


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PostPosted: 19 May 2019, 04:27 
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The hole is now in for the 6x4 rectifier.

I didn't have a cutter for the B7g so half hour with a Dremel.
The layout is just a test to set some positions for holes and the final position of the potentiometers isn't decided yet.
The N20 motor mounting was a slight problem so again fabricated from vero pad board and epoxy (rough initial build).
It will have a suppressor and braking resistor and better finish.
The transformer manufacturer likes flags :D
The valve bases are Audio Note. :confused:


Regards
M. Gregg


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Last edited by M. Gregg on 19 May 2019, 06:00, edited 1 time in total.

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PostPosted: 19 May 2019, 04:37 
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One idea at the moment,

is to build the M7 valve board on Kite Tufnol as a module and then build the other variation with the cathode driver.
Then it is possible to interchange the modules. However its all just ideas at the moment.


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M. Gregg

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PostPosted: 19 May 2019, 05:36 
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Just for interest,

The N20 motor can be fixed with an angle bracket with M1.6 pins.
However I want total electrical isolation from the chassis.
These motors are available with different voltages and speeds.
In this project its lowest speed motor, I'm going to try 6 to 1 ratio for the motor to pot drive.
I'll have to see how it goes.

Regards
M. Gregg


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