• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

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dch53

Member
Joined 2015
alex mm said:
Finished PP amplifier :D
Click to expand...

Beautiful work with great attention to detail.

Lots of good ideas I can use in my next build. I like the power transformer mounted underneath the top plate. It significantly reduces the size of the amp.

I also like how you've "potted" the Toroidy transformers. Did you use the covers from GD-Parts? I can't see from the pictures whether there are screw-heads showing on the top for those. I was going to mount the covers on top and paint the corners the same colour as the top plate but mounting them from underneath is much neater.

Is the top a sandwich to hide all the screws?

Finally, what are the covers over the wires where they enter the terminal blocks? They look too perfectly matched to be heat-shrink. Looks very professional. I use PTFE wire but only have red, black and blue because it's so expensive. The different coloured sleeves would help identify matching wire ends.
 

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alex mm

alex mm

Member
Joined 2006
dch53 said:
Beautiful work with great attention to detail.

Lots of good ideas I can use in my next build. I like the power transformer mounted underneath the top plate. It significantly reduces the size of the amp.

I also like how you've "potted" the Toroidy transformers. Did you use the covers from GD-Parts? I can't see from the pictures whether there are screw-heads showing on the top for those. I was going to mount the covers on top and paint the corners the same colour as the top plate but mounting them from underneath is much neater.

Is the top a sandwich to hide all the screws?

Finally, what are the covers over the wires where they enter the terminal blocks? They look too perfectly matched to be heat-shrink. Looks very professional. I use PTFE wire but only have red, black and blue because it's so expensive. The different coloured sleeves would help identify matching wire ends.
Click to expand...

Hi,
Thanks, for beautiful words addressed. I am not, at the first, amplifier built, and we always, learn something, and adapt, to the imposed, requirements. Yes, the covers, of the output transformers, are from GD parts, and I chose, the sandwich arrangement, for a smaller size of the amplifier. The insulation, is the original PVC of the transformers. The amplifier housing, is made of 1.5 mm iron sheet, laser cut, and painted, in electrostatic field. Lacquered beech, wood sides have been added, to the box for appearance. Quality parts was used for good performance.
The screws are drowned. I'm going to do tests, this week and the necessary adjustments.
BR Alex mm
 
Kei

Kei

Member
Joined 2009
dch53 said:
Finally, what are the covers over the wires where they enter the terminal blocks? They look too perfectly matched to be heat-shrink. Looks very professional. I use PTFE wire but only have red, black and blue because it's so expensive. The different coloured sleeves would help identify matching wire ends.
Click to expand...
They look like insulated bootlace ferrules which get crimped on to the ends of the wires. You need a suitable crimping tool to attach them properly. I find them to be perfect on screw down terminals.
 
tonescout

tonescout

Member
Joined 2020
CoolJazz said:
The black plate with all the boards is sandwiched to the bottom of the top plate. Everything is fastened with treaded standoffs that are welded into the bottom of the top plate.
Click to expand...

they look really good, and I bet they sound lovely :) my little boy is 5....give it another 5 years and I might have finished something nearly as nice.......for his 10th birthday
 
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