18watt 6v6 1987 layout

[Vintage59]

Hay everyone I am new to amp building this is my first attempt at turning a schematic into a layout i used mark huss,s 18watt 6v6 schematic could someone with a few more amps under their belt then me take a look at my layout to see if i have everything in the right place any comments would be greatly appreciated . I left out the fat switch ,the 220k 3watt resistor i think it is a bleed resistor and not sure what the .47uf cap is for after the standby switch but i left that out to.
Thanks

[steve_p]

Looks cool.
I didn't review it for content, but at 1st glance it looks pretty good.

I actually am starting on the exact same build, probably this week.
I had my sheetmetal shop make me up a 50W, 4-hole input style head chassis, but cut for 18W iron.

Are you going to do the 4 hole inputs? or are you going to parallel the inputs internally as in the original schematic?
I think my plan is for a 2-hole input, with 1 being both channels in parallel, and the other being only the bright channel, both on the high side. I saw an example from SDM here somewhere on the wiring for that.
I am also using a bridge rectifier, not diodes on the board.
Hopefully monday night I can start some of the initial assembly and wiring.

I was waiting on more stock for the front and rear panels. I ran out of gold reverse engraving stock for my laser last week, but it is due in Monday. After I get the faceplates cut, I will post a few real pictures.
Here is a snapshot of the CAD model:



Couple more pictures in the album here:
http://s674.photobucket.com/user/Steve_ ... v6%20Plexi" onclick="window.open(this.href);return false;
I will update the album as I make build progress.
Good luck!
Steve

[Vintage59]

Not sure if i will go with the 4,2 or 1 input ,i am still deciding if i will go with a head or combo .
I im going to try to build everything myself ,except bending the chassis,and laser engraving two brass plates
for the control panels.What voltages are you aiming for on the plates and screens of the 6v6s? ,i read fender was running them around 420v on some models ,i was thinking about 350v on both.Nice cad drawings by the way i wish i had the patience to learn how to use it!

[steve_p]

Not sure if i will go with the 4,2 or 1 input ,i am still deciding if i will go with a head or combo .
I im going to try to build everything myself ,except bending the chassis,and laser engraving two brass plates
for the control panels.What voltages are you aiming for on the plates and screens of the 6v6s? ,i read fender was running them around 420v on some models ,i was thinking about 350v on both.Nice cad drawings by the way i wish i had the patience to learn how to use it!

I am using a 295-0-295 PT, so I am hoping for up around 380-390 VDC at the 1st power supply node.

When are you planning on starting your build?

Steve

[Vintage59]

Not sure when i will start,but im guessing i will have to mess around with some resistor values
to get the DC where i want it. Hope everything goes well with your build.

[big_teee]

Not sure when i will start,but im guessing i will have to mess around with some resistor values
to get the DC where i want it. Hope everything goes well with your build.

Your 220k resistor on the Negative bias supply will probably have to be reduced.
Mark H used a 325-0-325 so he had a higher voltage to reduce.
In my area with high 125-127V AC house voltage, I have around a 1.43 multiplier.
Take 295 x 1.43 = 420v, so keep in mind what your wall AC voltage is, that will give you an idea what you will get.
For a Chassis you can use a 18 watt mojo chassis.
http://www.mojotone.com/amp-parts/chass ... le-Chassis" onclick="window.open(this.href);return false;
I built a 50 watt head on the 18 watt chassis.
You mount a Pot in the location of the second set of jacks.
That gives an extra hole on the end to put the PPI-MV master volume.
The picture below is the finished amp built on the 18 Watt mojo chassis.

Good Luck,
T

[Vintage59]

Not sure when i will start,but im guessing i will have to mess around with some resistor values
to get the DC where i want it. Hope everything goes well with your build.

Your 220k resistor on the Negative bias supply will probably have to be reduced.
Mark H used a 325-0-325 so he had a higher voltage to reduce.
In my area with high 125-127V AC house voltage, I have around a 1.43 multiplier.
Take 295 x 1.43 = 420v, so keep in mind what your wall AC voltage is, that will give you an idea what you will get.
For a Chassis you can use a 18 watt mojo chassis.
http://www.mojotone.com/amp-parts/chass ... le-Chassis" onclick="window.open(this.href);return false;
I built a 50 watt head on the 18 watt chassis.
You mount a Pot in the location of the second set of jacks.
That gives an extra hole on the end to put the PPI-MV master volume.
The picture below is the finished amp built on the 18 Watt mojo chassis.

Good Luck,
T

Thanks T yeah I was thinking sum resistor values would need changing with the 290-0-290 supply, classictone
also do a 312-0-312 so that could be another option.As far as the chassis i will prob bend it myself as i think i will go
with a combo cab along the lines of the jtm45.