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Supro DualTone in the 18Watt format

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Bas Hermus:
Hi everyone,

After I really enjoyed building my AC18, I was looking for a new project (stuff to do during the Christmas holidays).
I really like the Supro DualTone, so I looked around for a good schematic. I found one on Steve Luckey's website.

Using illustrator I have tried to translate it to TubeTown's 18 Watt format, using the same power transformer and output transformer.

In the drawing I added the option of switching the two preamps from parallel to series in order to get more gain (don't know whether this is a good idea).

What do you guys think?

Bas Hermus:
I just noticed that I made a mistake in the layout. I connected the OT to pin 6 instead of pin 9 on all three 12AX7's.
Serves me for looking at the schematic upside down...

This is the corrected one.

bluesfreak:
Hi,

that looks quite good, just 2 small things I would change:

1. 6973 has Grid #1 connected to Pin 3 and 6, I would bridge these pins to avoid having one side "floating"
2. same for Grid #2 , 6973 has Grid #2 connected to Pin 1 and 8, I would bridge these pins to avoid having one side "floating"

just my 2c

blues

Bas Hermus:
Hi Bluesfreak,

Thank you for the tips.
I actually see this in his schematic as well.
However, I don't see it in his layout or photographs.

I will take these along.
I will also try to ask Sluckey why he did not do this.

Bas Hermus:
Just got more information about this.

The pins are connected inside the tube.
You should not add these external jumpers (really not).

I attached the corrected layout again.

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