The Amp Garage

Well those are underwhelming...

EDIT: See my response below Tried this in a 6V6 18W today. The amp has a choke and resistor in series leading to the screen supply. With this the screens were already a bit lower than the plates. 6V6's had 470R 6.5W screen resistors. Added 220K from screen to ground. Used a SPST switch to break the...

26DEC

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Merry Christmas everyone

I snapped this picture the other day (the ES-335 was an early present for me)
[IMG:120:160]http://img.photobucket.com/albums/v610/kurtlives/th_1C0F5E88-07AB-4F13-AEF3-4FC969CBFDC6-4460-0000035A18971E17.jpg[/img]

Better to have the caps close to the stage your supplying than somewhere far away like in a dog house on top of the chassis (ala Fender).

The shorter your B+ and ground runs the better.

You should be using a 12AX7 btw.

Looking at this Marshall 18W schematic http://www.18watt.com/storage/18w%20Schematic.gif We see that both inputs of the PI are being used. Each input of the PI has a coupling cap and before that a 500K pot. Now the input of the PI has an input impedance of ~1M (the two 470K grid leads summed) I beli...

The VVR is useless in SE amps imo. A in line master volume is a much better idea I believe. How so Chris? Too much tech for the same return in volume control as an inline master in that application? Just wondering. I have a SE amp with VVR and the VVR does not respond like it normally does in a PP ...

The VVR is useless in SE amps imo.

A in line master volume is a much better idea I believe.

Short them out for now.

Where is it biased now (% dissipation at idle)? Were your previous similar amps also single-channel? Bottom line, I think, is that by hitting the strings hard you create a transient that takes grids past where they want to be. If you could get it to compress a little, it might help. A resistor in s...

Very cool, I'm anxious to see the final result.

Hopefully this build doesn't take quite as long as your HRM did.

The amps great, very responsive, it warmed up and got more "tube" like. I played around with all sorts of divider arrangements etc... my only goal was get the difference between the plate a screen to 0 or -, the tone quality was a surprise. I did notice that you can shut off the tube with the scree...

What are your resources for this project?

I'm impressed!

tribi9 wrote:

Richie wrote:plus usually you do not use the transformer bolts for putting ground lugs on.

but you do want the neutral from the power cord there tho, right?

Neutral, hell no.

Ground (your probably mean this); this shouldn't go on the PT either. It should have it's own dedicated ground point all by itself.

Better cheaper solution would be 8 or so small flat pack transformers. This way you get completely isolated outputs. Add a bit of perfboard, caps and a regulator and got got a great noise free isolated regulated supply. Weber stuff is usually cheap crap (not always though). The sag resistor thing is...